From b5677b47bc4b6f1053dea357a1744d7ae6701e46 Mon Sep 17 00:00:00 2001
From: Brent Scheffler <brent@brentscheffler.com>
Date: Fri, 18 Oct 2019 10:58:34 -0700
Subject: [PATCH] - Removing PubSub namespace. - Removing Dispatcher::listen()
 method. - Adding DispatchException class to be thrown if Message cannot be
 dispatched. - Queue::listen() now calls \pcntl_signal_dispatch() after
 passing message (if any) to callback. - Adding Queue::shutdown() message that
 will exit infinite loop in listen(). - Setting some default values in
 Beanstalk instead of falling back to null. - Removing release script and
 everything associated with. Releases now handled through Github.

---
 .editorconfig                 |    8 +
 Makefile                      |    7 +-
 README.md                     |  170 ++---
 VERSION                       |    1 -
 composer.json                 |   38 +-
 composer.lock                 | 1206 +++++++++++++++++----------------
 release                       |   45 --
 src/DispatchException.php     |   37 +
 src/Dispatcher.php            |   79 +--
 src/Message.php               |    4 +-
 src/MessageTransformer.php    |    1 -
 src/PubSub/PubSubAbstract.php |   45 --
 src/PubSub/Redis.php          |   87 ---
 src/PubSub/Sns.php            |   46 --
 src/Queue/Beanstalk.php       |   49 +-
 src/Queue/Google.php          |    6 +-
 src/Queue/Queue.php           |   23 +-
 src/Queue/Redis.php           |   13 +-
 src/Queue/RedisPubSub.php     |    7 +-
 src/Queue/Sqs.php             |    4 +-
 src/Router.php                |    2 +-
 tests/DispatcherTest.php      |    6 +-
 22 files changed, 891 insertions(+), 993 deletions(-)
 create mode 100644 .editorconfig
 delete mode 100644 VERSION
 delete mode 100755 release
 create mode 100644 src/DispatchException.php
 delete mode 100644 src/PubSub/PubSubAbstract.php
 delete mode 100644 src/PubSub/Redis.php
 delete mode 100644 src/PubSub/Sns.php

diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..ce78596
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,8 @@
+root=true
+
+[*]
+end_of_line=lf
+indent_style=tab
+indent_size=4
+charset=utf-8
+trim_trailing_whitespace=true
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 13e3ff9..d1eea77 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,3 @@
-.PHONY: release
-
 test:
 	vendor/bin/phpunit
 
@@ -7,7 +5,4 @@ coverage:
 	vendor/bin/phpunit --coverage-clover=build/logs/clover.xml
 
 analyze:
-	vendor/bin/psalm
-
-release:
-	php release
\ No newline at end of file
+	vendor/bin/psalm
\ No newline at end of file
diff --git a/README.md b/README.md
index 0ded271..6e7ab89 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,18 @@
 # Syndicate
 
-See the syndicate-framework repo for framework documentation.
+## Install
 
-## Using without a Router and Dispatcher
+```bash
+composer require nimbly/syndicate
+```
+
+## Basic usage
 
 ### Create Queue instance
+
 ```php
 $queue = new Syndicate\Queue\Sqs(
-    getenv("SQS_QUEUE_URL"),
+    "https://queue.url",
     new SqsClient([
         'version' => 'latest',
         'region' => 'us-west-2'
@@ -15,11 +20,32 @@ $queue = new Syndicate\Queue\Sqs(
 );
 ```
 
-### Set a serializer and deserializer callback (optional)
+### Listen on queue
 
-The serializer callback is applied to each outgoing queue message payload. It defaults to ```\json_encode```.
+Listening is a **blocking** call and runs in an infinite loop. Your callback will be triggered when a new Message has arrived.
 
-You can pass in any ```\callable``` instance as the serializer.
+```php
+$queue->listen(function(Message $message): void {
+
+	/**
+	 *
+	 *  Process the message...
+	 *
+	 */
+
+	// Delete the message from Queue.
+    $message->delete();
+
+});
+```
+
+### Setting a custom serializer and deserializer
+
+By default, Syndicate assumes your messages are JSON and will attempt to auto serialize/deserialize accordingly.
+
+However, if your messages are in some other format, you may supply your own serializer and deserializer callbacks.
+
+The serializer is applied to all outgoing message payloads.
 
 ```php
 $queue->setSerializer(function($message){
@@ -29,20 +55,16 @@ $queue->setSerializer(function($message){
 });
 ```
 
-The deserializer callback is applied to each incoming queue message payload. It defaults to ```\json_decode```.
+The deserializer callback is applied to all incoming message payloads.
 
-You can pass in any ```\callable``` instance as the deserializer. This is useful for performing more advanced
-message deserialization.
-
-For example, to handle deserializing a message payload from SQS that was forwarded by SNS, you could pass in
-the following.
+For example, to handle deserializing a message payload from SQS that was forwarded by SNS, you could pass in the following deserializer callback.
 
 ```php
-$queue->setDeserializer(function($payload){
+$queue->setDeserializer(function($payload) {
 
     $payload = \json_decode($payload);
 
-    if( property_exists($payload, "Type") &&
+    if( \property_exists($payload, "Type") &&
         $payload->Type === "Notification" ){
         return \json_decode($payload->Message);
     }
@@ -52,53 +74,86 @@ $queue->setDeserializer(function($payload){
 });
 ```
 
-### Listen on queue
+### Shutting down the Queue
 
-Listening is a blocking call and your callback will be triggered when a new Message has arrived.
+You may shutdown the queue by using the ```shutdown()``` method.
+
+The Queue instance will respond to PCNTL signals in a safe manner that will not interrupt in the middle of Message processing.
+You can install signal handlers in your code to cleanly and safely shutdown the service.
 
 ```php
-$queue->listen(function(Message $message){
+\pcntl_signal(
+	SIGINT,
+	function() use ($queue): void {
 
-    echo "Message received!\n";
-    $message->delete();
+		echo "Got SIGINT. Shutting queue down.";
+		$queue->shutdown();
 
-});
+	}
+);
 ```
 
-## Using a Router and Dispatcher
+## Routing and Dispatching
 
-Using a Router and Dispatcher you can have your messages passed off to specific Handlers. How you route is up to you and the message format.
+Using the `Dispatcher` and `Router` you can have your messages passed off to specific Handlers. How you route is up to you and the message format.
 
 Commonly, a message will contain a message type or event name - these are prime candidates for keys to routing.
 
 ### Router
-Create a new ```Router``` by passing in the ```\callable``` route resolver and an ```array``` of key and value pairs as the route definitions.
+
+Create a new `Router` instance by passing in a `\callable` route resolver and an `array` of key and value pairs as route definitions.
+
+### Route resolver
+
+The route resolver is responsible for taking the incoming Message instance and finding a matching route to dispatch the Message to.
+
+The dispatcher will loop through all configured routes and call the resolver with the Message and a route.
+
+The resolver must simple return a `bool` value indicating whether the message matches the given route.
+
+
+### Route definitions
+
+The route definitions are an array of key/value pairs mapping any key you want to either a `callable`, `string` in the format of `Full\Namespace\ClassName@methodName`, or an array of the above.
+
 
 ```php
-$router = new Router(function(Message $message, string $route){
+$router = new Router(function(Message $message, string $routeKey): bool {
 
-    return $message->getPayload()->eventName == $route;
+    return $message->getPayload()->eventName == $routeKey;
 
 }, [
 
-    'UserRegistered' => ["\App\Handlers\UserHandler", "userRegistered"],
-    'UserClosedAccount' => ["\App\Handlers\UserHandler", "userAccountClosed"]
+	'UserLoggedOff' => function(Message $message): void {
+		// Do some session cleanup stuff...
+	},
+
+	'UserRegistered' => '\App\Handlers\UserHandler@userRegistered',
+
+    'UserClosedAccount' => [
+		'\App\Handlers\UserHandler@userAccountClosed',
+		'\App\Handlers\NotificationHandler@userAccountClosed'
+	]
 
 ]);
 ```
 
 ### Dispatcher
-Create a new ```Dispatcher``` by passing the ```Router``` instance.
+
+Create a new ```Dispatcher``` instance by passing the ```Router``` instance.
 
 ```php
 $dispatcher = new Dispatcher($router);
 ```
 
 ### Add a default handler
-If the ```Router``` cannot resolve a route for the ```Message```, the ```Dispatcher``` will attempt to pass the message off to the default handler.
+
+If the ```Router``` cannot resolve a route for the ```Message```, the ```Dispatcher``` will attempt to pass the message off to its default handler.
+
+The default handler can be set as a ```callable``` and accepts the ```Message``` instance.
 
 ```php
-$dispatcher->setDefaultHandler(function(Message $message){
+$dispatcher->setDefaultHandler(function(Message $message): void {
 
     Log::critical("No route defined for {$message->getPayload()->eventName}!");
     $message->release();
@@ -106,59 +161,14 @@ $dispatcher->setDefaultHandler(function(Message $message){
 });
 ```
 
-### Starting the listener
-```php
-$dispatcher->listen($queue);
-```
-
-## Putting it all together
-```php
-// Create Queue instance
-$queue = new Syndicate\Queue\Sqs(
-    getenv("SQS_QUEUE_URL"),
-    new SqsClient([
-        'version' => 'latest',
-        'region' => 'us-west-2'
-    ])
-);
-
-// Set a custom deserializer.
-$queue->setDeserializer(function($payload){
-
-    $payload = \json_decode($payload);
-
-    if( property_exists($payload, "Type") &&
-        $payload->Type === "Notification" ){
-        return \json_decode($payload->Message);
-    }
-
-    return $payload;
-
-});
-
-// Create Router instance with a resolver and our list of routes.
-$router = new Router(function(Message $message, string $route){
-
-    return $message->getPayload()->eventName == $route;
-
-}, [
+If the Message cannot be dispatched and no default handler was given, a `DispatchException` will be thrown.
 
-    'UserRegistered' => ["\App\Handlers\UserHandler", "userRegistered"],
-    'UserClosedAccount' => ["\App\Handlers\UserHandler", "userAccountClosed"]
+### Using the Dispatcher with the Queue
 
-]);
-
-// Create Dispatcher instance.
-$dispatcher = new Dispatcher($router);
-
-// Set a default handler.
-$dispatcher->setDefaultHandler(function(Message $message){
+```php
+$queue->listen(function(Message $message) use ($dispatcher): void {
 
-    Log::critical("No route defined for {$message->getPayload()->eventName}!");
-    $message->release();
+	$dispatcher->dispatch($message);
 
 });
-
-// Listen for new messages.
-$dispatcher->listen();
 ```
\ No newline at end of file
diff --git a/VERSION b/VERSION
deleted file mode 100644
index 5d4294b..0000000
--- a/VERSION
+++ /dev/null
@@ -1 +0,0 @@
-0.5.1
\ No newline at end of file
diff --git a/composer.json b/composer.json
index adcdc81..066b172 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,6 @@
 {
-    "name": "nimbly\/syndicate",
-    "description": "Framework agnostic queue and pubsub library.",
-    "version": "0.5.1",
+    "name": "nimbly/syndicate",
+    "description": "Simple queue consumer framework that supports message dispatching.",
     "type": "library",
     "license": "MIT",
     "authors": [
@@ -11,29 +10,30 @@
         }
     ],
     "suggest": {
-        "pda\/pheanstalk": "To add support for Beanstalkd queue.",
-        "predis\/predis": "To add support for Redis based queue and pub\/sub functionality.",
-        "aws\/aws-sdk-php": "To add support for AWS Simple Queue Service (SQS).",
-        "google\/cloud-pubsub": "To add support for Google Cloud Pubsub."
+        "pda/pheanstalk": "To add support for Beanstalkd queue.",
+        "predis/predis": "To add support for Redis based queue and pub/sub functionality.",
+        "aws/aws-sdk-php": "To add support for AWS Simple Queue Service (SQS).",
+        "google/cloud-pubsub": "To add support for Google Cloud Pubsub."
     },
     "require": {
-        "php": ">=7.0"
+		"php": ">=7.2",
+		"ext-json": "*"
     },
     "require-dev": {
-        "vimeo\/psalm": "^3.1",
-        "phpunit\/phpunit": "^8.0",
-        "pda\/pheanstalk": "~3.0",
-        "aws\/aws-sdk-php": "~3.0",
-        "predis\/predis": "~1.0",
-        "google\/cloud-pubsub": "^1.7",
-        "symfony\/var-dumper": "^4.2",
-        "php-coveralls\/php-coveralls": "^2.1",
-        "squizlabs\/php_codesniffer": "^3.4",
-        "phploc\/phploc": "^5.0"
+        "vimeo/psalm": "^3.1",
+        "phpunit/phpunit": "^8.0",
+        "pda/pheanstalk": "~3.0",
+        "aws/aws-sdk-php": "~3.0",
+        "predis/predis": "~1.0",
+        "google/cloud-pubsub": "^1.7",
+        "symfony/var-dumper": "^4.2",
+        "php-coveralls/php-coveralls": "^2.1",
+        "squizlabs/php_codesniffer": "^3.4",
+        "phploc/phploc": "^5.0"
     },
     "autoload": {
         "psr-4": {
-            "Syndicate\\": "src\/"
+            "Syndicate\\": "src/"
         }
     }
 }
\ No newline at end of file
diff --git a/composer.lock b/composer.lock
index 2808f9d..9c62137 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,31 +4,32 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "030f345ab804b9a54f2d2eda1b5cf4d4",
+    "content-hash": "6c87dbf12b47a18df2b471bc70bbf4fe",
     "packages": [],
     "packages-dev": [
         {
             "name": "amphp/amp",
-            "version": "v2.1.1",
+            "version": "v2.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/amp.git",
-                "reference": "7075ef7d74dbd32626bfd31c976b23055c3ade6a"
+                "reference": "5a294f13810844e3bdda28c0f352821d735ca9b3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/amp/zipball/7075ef7d74dbd32626bfd31c976b23055c3ade6a",
-                "reference": "7075ef7d74dbd32626bfd31c976b23055c3ade6a",
+                "url": "https://api.github.com/repos/amphp/amp/zipball/5a294f13810844e3bdda28c0f352821d735ca9b3",
+                "reference": "5a294f13810844e3bdda28c0f352821d735ca9b3",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7"
             },
             "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
                 "amphp/phpunit-util": "^1",
-                "friendsofphp/php-cs-fixer": "^2.3",
+                "ext-json": "*",
                 "phpstan/phpstan": "^0.8.5",
-                "phpunit/phpunit": "^6.0.9",
+                "phpunit/phpunit": "^6.0.9 | ^7",
                 "react/promise": "^2"
             },
             "type": "library",
@@ -51,14 +52,6 @@
                 "MIT"
             ],
             "authors": [
-                {
-                    "name": "Bob Weinand",
-                    "email": "bobwei9@hotmail.com"
-                },
-                {
-                    "name": "Niklas Keller",
-                    "email": "me@kelunik.com"
-                },
                 {
                     "name": "Daniel Lowrey",
                     "email": "rdlowrey@php.net"
@@ -66,6 +59,14 @@
                 {
                     "name": "Aaron Piotrowski",
                     "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Bob Weinand",
+                    "email": "bobwei9@hotmail.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
                 }
             ],
             "description": "A non-blocking concurrency framework for PHP applications.",
@@ -81,20 +82,20 @@
                 "non-blocking",
                 "promise"
             ],
-            "time": "2018-12-11T10:31:37+00:00"
+            "time": "2019-10-01T19:39:23+00:00"
         },
         {
             "name": "amphp/byte-stream",
-            "version": "v1.5.1",
+            "version": "v1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/byte-stream.git",
-                "reference": "6bbfcb6f47e92577e739586ba0c87e867be70a23"
+                "reference": "3d457738751295b9bf6b15036578e7823919f724"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/6bbfcb6f47e92577e739586ba0c87e867be70a23",
-                "reference": "6bbfcb6f47e92577e739586ba0c87e867be70a23",
+                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/3d457738751295b9bf6b15036578e7823919f724",
+                "reference": "3d457738751295b9bf6b15036578e7823919f724",
                 "shasum": ""
             },
             "require": {
@@ -121,13 +122,13 @@
                 "MIT"
             ],
             "authors": [
-                {
-                    "name": "Niklas Keller",
-                    "email": "me@kelunik.com"
-                },
                 {
                     "name": "Aaron Piotrowski",
                     "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
                 }
             ],
             "description": "A stream abstraction to make working with non-blocking I/O simple.",
@@ -140,20 +141,20 @@
                 "non-blocking",
                 "stream"
             ],
-            "time": "2018-12-27T18:08:06+00:00"
+            "time": "2019-08-24T17:01:13+00:00"
         },
         {
             "name": "aws/aws-sdk-php",
-            "version": "3.93.9",
+            "version": "3.112.24",
             "source": {
                 "type": "git",
                 "url": "https://github.com/aws/aws-sdk-php.git",
-                "reference": "047622ae51d49a89f4045c2daa138c2b47d2e089"
+                "reference": "6997f23a47714d084cd2d40b6348b99e10439d64"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/047622ae51d49a89f4045c2daa138c2b47d2e089",
-                "reference": "047622ae51d49a89f4045c2daa138c2b47d2e089",
+                "url": "https://api.github.com/repos/aws/aws-sdk-php/zipball/6997f23a47714d084cd2d40b6348b99e10439d64",
+                "reference": "6997f23a47714d084cd2d40b6348b99e10439d64",
                 "shasum": ""
             },
             "require": {
@@ -223,20 +224,20 @@
                 "s3",
                 "sdk"
             ],
-            "time": "2019-05-14T18:16:56+00:00"
+            "time": "2019-10-17T18:10:45+00:00"
         },
         {
             "name": "composer/xdebug-handler",
-            "version": "1.3.2",
+            "version": "1.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/xdebug-handler.git",
-                "reference": "d17708133b6c276d6e42ef887a877866b909d892"
+                "reference": "46867cbf8ca9fb8d60c506895449eb799db1184f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/d17708133b6c276d6e42ef887a877866b909d892",
-                "reference": "d17708133b6c276d6e42ef887a877866b909d892",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/46867cbf8ca9fb8d60c506895449eb799db1184f",
+                "reference": "46867cbf8ca9fb8d60c506895449eb799db1184f",
                 "shasum": ""
             },
             "require": {
@@ -267,7 +268,7 @@
                 "Xdebug",
                 "performance"
             ],
-            "time": "2019-01-28T20:25:53+00:00"
+            "time": "2019-05-27T17:52:04+00:00"
         },
         {
             "name": "doctrine/instantiator",
@@ -327,16 +328,16 @@
         },
         {
             "name": "felixfbecker/advanced-json-rpc",
-            "version": "v3.0.3",
+            "version": "v3.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/felixfbecker/php-advanced-json-rpc.git",
-                "reference": "241c470695366e7b83672be04ea0e64d8085a551"
+                "reference": "23366dd0cab0a0f3fd3016bf3c0b36dec74348e7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/felixfbecker/php-advanced-json-rpc/zipball/241c470695366e7b83672be04ea0e64d8085a551",
-                "reference": "241c470695366e7b83672be04ea0e64d8085a551",
+                "url": "https://api.github.com/repos/felixfbecker/php-advanced-json-rpc/zipball/23366dd0cab0a0f3fd3016bf3c0b36dec74348e7",
+                "reference": "23366dd0cab0a0f3fd3016bf3c0b36dec74348e7",
                 "shasum": ""
             },
             "require": {
@@ -364,20 +365,20 @@
                 }
             ],
             "description": "A more advanced JSONRPC implementation",
-            "time": "2018-09-10T08:58:41+00:00"
+            "time": "2019-09-12T22:41:08+00:00"
         },
         {
             "name": "felixfbecker/language-server-protocol",
-            "version": "v1.2.0",
+            "version": "v1.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/felixfbecker/php-language-server-protocol.git",
-                "reference": "1bdd1bcc95428edf85ec04c7b558d0886c07280f"
+                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/1bdd1bcc95428edf85ec04c7b558d0886c07280f",
-                "reference": "1bdd1bcc95428edf85ec04c7b558d0886c07280f",
+                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/378801f6139bb74ac215d81cca1272af61df9a9f",
+                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f",
                 "shasum": ""
             },
             "require": {
@@ -411,7 +412,7 @@
                 "php",
                 "server"
             ],
-            "time": "2018-09-25T11:42:25+00:00"
+            "time": "2019-06-23T21:03:50+00:00"
         },
         {
             "name": "firebase/php-jwt",
@@ -461,16 +462,16 @@
         },
         {
             "name": "google/auth",
-            "version": "v1.5.1",
+            "version": "v1.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/googleapis/google-auth-library-php.git",
-                "reference": "0f75e20e7392e863f5550ed2c2d3d50af21710fb"
+                "reference": "6d5455b4c0f4a58b1f1b4bdf2ba49221123698b3"
             },
             "dist": {
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@@ -2433,6 +2327,55 @@
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-            "description": "Symfony Finder Component",
+            "description": "Symfony polyfill for ctype functions",
             "homepage": "https://symfony.com",
-            "time": "2019-04-06T13:51:08+00:00"
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2019-08-06T08:03:45+00:00"
         },
         {
-            "name": "symfony/polyfill-ctype",
-            "version": "v1.11.0",
+            "name": "symfony/polyfill-mbstring",
+            "version": "v1.12.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/polyfill-ctype.git",
-                "reference": "82ebae02209c21113908c229e9883c419720738a"
+                "url": "https://github.com/symfony/polyfill-mbstring.git",
+                "reference": "b42a2f66e8f1b15ccf25652c3424265923eb4f17"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/82ebae02209c21113908c229e9883c419720738a",
-                "reference": "82ebae02209c21113908c229e9883c419720738a",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/b42a2f66e8f1b15ccf25652c3424265923eb4f17",
+                "reference": "b42a2f66e8f1b15ccf25652c3424265923eb4f17",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
             "suggest": {
-                "ext-ctype": "For best performance"
+                "ext-mbstring": "For best performance"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.11-dev"
+                    "dev-master": "1.12-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Symfony\\Polyfill\\Ctype\\": ""
+                    "Symfony\\Polyfill\\Mbstring\\": ""
                 },
                 "files": [
                     "bootstrap.php"
@@ -3618,53 +3598,51 @@
             ],
             "authors": [
                 {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
                 },
                 {
-                    "name": "Gert de Pagter",
-                    "email": "BackEndTea@gmail.com"
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony polyfill for ctype functions",
+            "description": "Symfony polyfill for the Mbstring extension",
             "homepage": "https://symfony.com",
             "keywords": [
                 "compatibility",
-                "ctype",
+                "mbstring",
                 "polyfill",
-                "portable"
+                "portable",
+                "shim"
             ],
-            "time": "2019-02-06T07:57:58+00:00"
+            "time": "2019-08-06T08:03:45+00:00"
         },
         {
-            "name": "symfony/polyfill-mbstring",
-            "version": "v1.11.0",
+            "name": "symfony/polyfill-php72",
+            "version": "v1.12.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "fe5e94c604826c35a32fa832f35bd036b6799609"
+                "url": "https://github.com/symfony/polyfill-php72.git",
+                "reference": "04ce3335667451138df4307d6a9b61565560199e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/fe5e94c604826c35a32fa832f35bd036b6799609",
-                "reference": "fe5e94c604826c35a32fa832f35bd036b6799609",
+                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/04ce3335667451138df4307d6a9b61565560199e",
+                "reference": "04ce3335667451138df4307d6a9b61565560199e",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
-            "suggest": {
-                "ext-mbstring": "For best performance"
-            },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.11-dev"
+                    "dev-master": "1.12-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Symfony\\Polyfill\\Mbstring\\": ""
+                    "Symfony\\Polyfill\\Php72\\": ""
                 },
                 "files": [
                     "bootstrap.php"
@@ -3684,29 +3662,28 @@
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony polyfill for the Mbstring extension",
+            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
             "homepage": "https://symfony.com",
             "keywords": [
                 "compatibility",
-                "mbstring",
                 "polyfill",
                 "portable",
                 "shim"
             ],
-            "time": "2019-02-06T07:57:58+00:00"
+            "time": "2019-08-06T08:03:45+00:00"
         },
         {
-            "name": "symfony/polyfill-php72",
-            "version": "v1.11.0",
+            "name": "symfony/polyfill-php73",
+            "version": "v1.12.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/polyfill-php72.git",
-                "reference": "ab50dcf166d5f577978419edd37aa2bb8eabce0c"
+                "url": "https://github.com/symfony/polyfill-php73.git",
+                "reference": "2ceb49eaccb9352bff54d22570276bb75ba4a188"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php72/zipball/ab50dcf166d5f577978419edd37aa2bb8eabce0c",
-                "reference": "ab50dcf166d5f577978419edd37aa2bb8eabce0c",
+                "url": "https://api.github.com/repos/symfony/polyfill-php73/zipball/2ceb49eaccb9352bff54d22570276bb75ba4a188",
+                "reference": "2ceb49eaccb9352bff54d22570276bb75ba4a188",
                 "shasum": ""
             },
             "require": {
@@ -3715,15 +3692,18 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.11-dev"
+                    "dev-master": "1.12-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Symfony\\Polyfill\\Php72\\": ""
+                    "Symfony\\Polyfill\\Php73\\": ""
                 },
                 "files": [
                     "bootstrap.php"
+                ],
+                "classmap": [
+                    "Resources/stubs"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -3740,7 +3720,7 @@
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
+            "description": "Symfony polyfill backporting some PHP 7.3+ features to lower PHP versions",
             "homepage": "https://symfony.com",
             "keywords": [
                 "compatibility",
@@ -3748,30 +3728,88 @@
                 "portable",
                 "shim"
             ],
-            "time": "2019-02-06T07:57:58+00:00"
+            "time": "2019-08-06T08:03:45+00:00"
+        },
+        {
+            "name": "symfony/service-contracts",
+            "version": "v1.1.7",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/service-contracts.git",
+                "reference": "ffcde9615dc5bb4825b9f6aed07716f1f57faae0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/service-contracts/zipball/ffcde9615dc5bb4825b9f6aed07716f1f57faae0",
+                "reference": "ffcde9615dc5bb4825b9f6aed07716f1f57faae0",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1.3",
+                "psr/container": "^1.0"
+            },
+            "suggest": {
+                "symfony/service-implementation": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Contracts\\Service\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Generic abstractions related to writing services",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "abstractions",
+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
+            ],
+            "time": "2019-09-17T11:12:18+00:00"
         },
         {
             "name": "symfony/stopwatch",
-            "version": "v4.2.8",
+            "version": "v4.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/stopwatch.git",
-                "reference": "b1a5f646d56a3290230dbc8edf2a0d62cda23f67"
+                "reference": "1e4ff456bd625be5032fac9be4294e60442e9b71"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/b1a5f646d56a3290230dbc8edf2a0d62cda23f67",
-                "reference": "b1a5f646d56a3290230dbc8edf2a0d62cda23f67",
+                "url": "https://api.github.com/repos/symfony/stopwatch/zipball/1e4ff456bd625be5032fac9be4294e60442e9b71",
+                "reference": "1e4ff456bd625be5032fac9be4294e60442e9b71",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1.3",
-                "symfony/contracts": "^1.0"
+                "symfony/service-contracts": "^1.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.2-dev"
+                    "dev-master": "4.3-dev"
                 }
             },
             "autoload": {
@@ -3798,20 +3836,20 @@
             ],
             "description": "Symfony Stopwatch Component",
             "homepage": "https://symfony.com",
-            "time": "2019-01-16T20:31:39+00:00"
+            "time": "2019-08-07T11:52:19+00:00"
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v4.2.8",
+            "version": "v4.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "3c4084cb1537c0e2ad41aad622bbf55a44a5c9ce"
+                "reference": "bde8957fc415fdc6964f33916a3755737744ff05"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/3c4084cb1537c0e2ad41aad622bbf55a44a5c9ce",
-                "reference": "3c4084cb1537c0e2ad41aad622bbf55a44a5c9ce",
+                "url": "https://api.github.com/repos/symfony/var-dumper/zipball/bde8957fc415fdc6964f33916a3755737744ff05",
+                "reference": "bde8957fc415fdc6964f33916a3755737744ff05",
                 "shasum": ""
             },
             "require": {
@@ -3840,7 +3878,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.2-dev"
+                    "dev-master": "4.3-dev"
                 }
             },
             "autoload": {
@@ -3874,20 +3912,20 @@
                 "debug",
                 "dump"
             ],
-            "time": "2019-05-01T12:55:36+00:00"
+            "time": "2019-10-04T19:48:13+00:00"
         },
         {
             "name": "symfony/yaml",
-            "version": "v4.2.8",
+            "version": "v4.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "6712daf03ee25b53abb14e7e8e0ede1a770efdb1"
+                "reference": "41e16350a2a1c7383c4735aa2f9fce74cf3d1178"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/6712daf03ee25b53abb14e7e8e0ede1a770efdb1",
-                "reference": "6712daf03ee25b53abb14e7e8e0ede1a770efdb1",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/41e16350a2a1c7383c4735aa2f9fce74cf3d1178",
+                "reference": "41e16350a2a1c7383c4735aa2f9fce74cf3d1178",
                 "shasum": ""
             },
             "require": {
@@ -3906,7 +3944,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "4.2-dev"
+                    "dev-master": "4.3-dev"
                 }
             },
             "autoload": {
@@ -3933,7 +3971,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2019-03-30T15:58:42+00:00"
+            "time": "2019-09-11T15:41:19+00:00"
         },
         {
             "name": "theseer/fdomdocument",
@@ -3977,16 +4015,16 @@
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.1.2",
+            "version": "1.1.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "1c42705be2b6c1de5904f8afacef5895cab44bf8"
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/1c42705be2b6c1de5904f8afacef5895cab44bf8",
-                "reference": "1c42705be2b6c1de5904f8afacef5895cab44bf8",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
+                "reference": "11336f6f84e16a720dae9d8e6ed5019efa85a0f9",
                 "shasum": ""
             },
             "require": {
@@ -4013,20 +4051,20 @@
                 }
             ],
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
-            "time": "2019-04-04T09:56:43+00:00"
+            "time": "2019-06-13T22:48:21+00:00"
         },
         {
             "name": "vimeo/psalm",
-            "version": "3.2.12",
+            "version": "3.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/vimeo/psalm.git",
-                "reference": "fe0f352132f798512ced19faf75cbfc84e4aabe7"
+                "reference": "7857b07f91bed5afae98574243fed7ec4088d623"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/vimeo/psalm/zipball/fe0f352132f798512ced19faf75cbfc84e4aabe7",
-                "reference": "fe0f352132f798512ced19faf75cbfc84e4aabe7",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/7857b07f91bed5afae98574243fed7ec4088d623",
+                "reference": "7857b07f91bed5afae98574243fed7ec4088d623",
                 "shasum": ""
             },
             "require": {
@@ -4034,14 +4072,13 @@
                 "amphp/byte-stream": "^1.5",
                 "composer/xdebug-handler": "^1.1",
                 "felixfbecker/advanced-json-rpc": "^3.0.3",
-                "felixfbecker/language-server-protocol": "^1.2",
-                "muglug/package-versions-56": "1.2.4",
+                "felixfbecker/language-server-protocol": "^1.4",
                 "netresearch/jsonmapper": "^1.0",
-                "nikic/php-parser": "^4.0.2 || ^4.1",
-                "openlss/lib-array2xml": "^0.0.10||^0.5.1",
-                "php": "^7.0",
-                "php-cs-fixer/diff": "^1.2",
-                "phpmyadmin/sql-parser": "^4.0",
+                "nikic/php-parser": "^4.2",
+                "ocramius/package-versions": "^1.2",
+                "openlss/lib-array2xml": "^1.0",
+                "php": "^7.1.3",
+                "sebastian/diff": "^3.0",
                 "symfony/console": "^3.3||^4.0",
                 "webmozart/glob": "^4.1",
                 "webmozart/path-util": "^2.3"
@@ -4051,9 +4088,14 @@
             },
             "require-dev": {
                 "bamarni/composer-bin-plugin": "^1.2",
-                "phpunit/phpunit": "^6.0 || ^7.0",
-                "psalm/plugin-phpunit": "^0.5.5",
-                "squizlabs/php_codesniffer": "3.4.0"
+                "ext-curl": "*",
+                "friendsofphp/php-cs-fixer": "^2.15",
+                "phpmyadmin/sql-parser": "^5.0",
+                "phpunit/phpunit": "^7.5 || ^8.0",
+                "psalm/plugin-phpunit": "^0.6",
+                "slevomat/coding-standard": "^5.0",
+                "squizlabs/php_codesniffer": "3.4.0",
+                "symfony/process": "^4.3"
             },
             "suggest": {
                 "ext-igbinary": "^2.0.5"
@@ -4062,7 +4104,8 @@
                 "psalm",
                 "psalter",
                 "psalm-language-server",
-                "psalm-plugin"
+                "psalm-plugin",
+                "psalm-refactor"
             ],
             "type": "library",
             "extra": {
@@ -4076,7 +4119,10 @@
                 "psr-4": {
                     "Psalm\\Plugin\\": "src/Psalm/Plugin",
                     "Psalm\\": "src/Psalm"
-                }
+                },
+                "files": [
+                    "src/functions.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -4093,20 +4139,20 @@
                 "inspection",
                 "php"
             ],
-            "time": "2019-05-13T15:00:17+00:00"
+            "time": "2019-10-11T12:24:35+00:00"
         },
         {
             "name": "webmozart/assert",
-            "version": "1.4.0",
+            "version": "1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/webmozart/assert.git",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9"
+                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/assert/zipball/83e253c8e0be5b0257b881e1827274667c5c17a9",
-                "reference": "83e253c8e0be5b0257b881e1827274667c5c17a9",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/88e6d84706d09a236046d686bbea96f07b3a34f4",
+                "reference": "88e6d84706d09a236046d686bbea96f07b3a34f4",
                 "shasum": ""
             },
             "require": {
@@ -4114,8 +4160,7 @@
                 "symfony/polyfill-ctype": "^1.8"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1"
+                "phpunit/phpunit": "^4.8.36 || ^7.5.13"
             },
             "type": "library",
             "extra": {
@@ -4144,7 +4189,7 @@
                 "check",
                 "validate"
             ],
-            "time": "2018-12-25T11:19:39+00:00"
+            "time": "2019-08-24T08:43:50+00:00"
         },
         {
             "name": "webmozart/glob",
@@ -4246,7 +4291,8 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.0"
+        "php": ">=7.2",
+        "ext-json": "*"
     },
     "platform-dev": []
 }
diff --git a/release b/release
deleted file mode 100755
index 861dc52..0000000
--- a/release
+++ /dev/null
@@ -1,45 +0,0 @@
-#!/usr/bin/env php
-<?php
-
-$composer = json_decode(file_get_contents('composer.json'));
-
-echo "\nTag and submit a new release of:\n\n*\n* {$composer->name}\n* {$composer->description}\n*\n";
-
-$currentVersion = file_get_contents('VERSION');
-echo "\nCurrent version: {$currentVersion}\n";
-
-$input = fopen("php://stdin", "r");
-
-if( isset($argv[1]) ) {
-    $version = $argv[1];
-	echo "New version: {$version}\n\n";
-
-} else {
-	echo "New version: ";
-	$version = trim(fgets($input));
-	echo "\n";
-}
-
-if( empty($version) ){
-    echo "Invalid version number.\nAborting.\n\n";
-    exit;
-}
-
-echo "Are you sure you want to do this?  Type 'yes' to continue: ";
-if( strtolower(trim(fgets($input))) !== 'yes' ){
-	echo "Aborting.\n\n";
-	exit;
-}
-
-// Update composer.json file with latest version number
-$composer->version = (string) $version;
-file_put_contents('composer.json', json_encode($composer, JSON_PRETTY_PRINT));
-
-// Write version number to disk
-file_put_contents('VERSION', $version);
-
-// Commit & push changes, tag commit and push again
-exec("git commit -am \"Tagging version {$version}\"");
-exec("git push");
-exec("git tag {$version}");
-exec("git push --tags");
\ No newline at end of file
diff --git a/src/DispatchException.php b/src/DispatchException.php
new file mode 100644
index 0000000..627fb2a
--- /dev/null
+++ b/src/DispatchException.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace Syndicate;
+
+use Exception;
+use Syndicate\Message;
+
+class DispatchException extends Exception
+{
+	/**
+	 * Message instance.
+	 *
+	 * @var Message|null
+	 */
+	protected $queueMessage;
+
+	/**
+	 * Set the Message instance that could not be dispatched.
+	 *
+	 * @param Message $message
+	 * @return void
+	 */
+	public function setQueueMessage(Message $message): void
+	{
+		$this->queueMessage = $message;
+	}
+
+	/**
+	 * Get the Message instance that could be dispatched.
+	 *
+	 * @return Message|null
+	 */
+	public function getQueueMessage(): ?Message
+	{
+		return $this->queueMessage;
+	}
+}
\ No newline at end of file
diff --git a/src/Dispatcher.php b/src/Dispatcher.php
index 5b84181..2c55bf2 100644
--- a/src/Dispatcher.php
+++ b/src/Dispatcher.php
@@ -3,10 +3,8 @@
 namespace Syndicate;
 
 use Syndicate\Message;
-use Syndicate\Queue\Queue;
 use Syndicate\Router;
 
-
 class Dispatcher
 {
     /**
@@ -51,75 +49,70 @@ public function setDefaultHandler(callable $defaultHandler): void
         $this->defaultHandler = $defaultHandler;
     }
 
-    /**
-     * Listen on a Queue for new messages to be dispatched.
-     * 
-     * This is a blocking call.
-     *
-     * @param Queue $queue
-     * @return void
-     */
-    public function listen(Queue $queue): void
-    {
-        $queue->listen(function(Message $message): void {
-
-            $this->dispatch($message);
-            
-        });
-    }
-
     /**
      * Dispatch the given Message.
-     * 
-     * Throws an exception if no route can be found and no defaultHandler was given.
+     *
+     * Throws a DispatchException if no route can be found and no defaultHandler was given.
      *
      * @param Message $message
-     * @throws \Exception
+     * @throws DispatchException
      * @return void
      */
     public function dispatch(Message $message): void
     {
-        // No handler could be resolved, fallback to defaultHandler.
-        if( ($handler = $this->router->resolve($message)) === null ){
-            $handler = $this->defaultHandler;
+        /** @var string|array|null $handler */
+        $handler = $this->router->resolve($message);
+
+        if( empty($handler) ){
+			$handler = $this->defaultHandler;
+
+			if( empty($handler) ){
+				$dispatchException = new DispatchException("Cannot resolve handler and no default handler defined.");
+				$dispatchException->setQueueMessage($message);
+				throw $dispatchException;
+			}
         }
 
-        $handlers = $this->resolveHandlers($handler);
+        $callableHandlers = $this->makeHandlersCallable($handler);
 
-        if( empty($handlers) ){
-            throw new \Exception("Cannot resolve handler.");
+        if( empty($callableHandlers) ){
+			$dispatchException = new DispatchException("Cannot resolve handlers into callables.");
+			$dispatchException->setQueueMessage($message);
+			throw $dispatchException;
         }
 
-        foreach( $handlers as $handler ){
-            \call_user_func($handler, $message);
+        foreach( $callableHandlers as $callableHandler ){
+            \call_user_func($callableHandler, $message);
         }
     }
 
     /**
-     * Try and resolve the handler type into a callable.
+     * Try and resolve the handler(s) into an array of callables.
      *
      * @param string|array|callable $handlers
      * @return array<callable>
      */
-    private function resolveHandlers($handlers): array
+    private function makeHandlersCallable($handlers): array
     {
         if( !\is_array($handlers) ){
             $handlers = [$handlers];
         }
 
-        $callables = [];
-
-        foreach( $handlers as $handler ){
+        /**
+		 * @var array $callables
+		 * @psalm-suppress MissingClosureParamType
+		 */
+        $callables = \array_reduce($handlers, function(array $callables, $handler): array {
 
             if( \is_callable($handler) ){
                 $callables[] = $handler;
             }
-    
-            // Could be of the format ClassName@MethodName or ClassName::MethodName
-            if( \is_string($handler) ){
-    
+
+            elseif( \is_string($handler) ){
+
+                // Could be of the format ClassName@MethodName or ClassName::MethodName
                 if( \preg_match("/^(.+)\@(.+)$/", $handler, $match) ){
-    
+
                     if( ($instance = $this->getFromHandlerCache($match[1])) == false ){
 
                         /**
@@ -128,12 +121,14 @@ private function resolveHandlers($handlers): array
                         $instance = new $match[1];
                         $this->putInHandlerCache($match[1], $instance);
                     }
-    
+
                     $callables[] = [$instance, $match[2]];
                 }
             }
 
-        }
+            return $callables;
+
+        }, []);
 
         return $callables;
     }
diff --git a/src/Message.php b/src/Message.php
index 0a893a0..08c8c20 100644
--- a/src/Message.php
+++ b/src/Message.php
@@ -14,14 +14,14 @@ class Message
     protected $queue;
 
     /**
-     * Source message object/data.
+     * Source message data.
      *
      * @var mixed
      */
     protected $sourceMessage;
 
     /**
-     * The payload of the message.
+     * The parsed/decoded payload of the source message.
      *
      * @var mixed
      */
diff --git a/src/MessageTransformer.php b/src/MessageTransformer.php
index 8564fe8..ab512db 100644
--- a/src/MessageTransformer.php
+++ b/src/MessageTransformer.php
@@ -18,7 +18,6 @@ abstract class MessageTransformer
      */
     protected $deserializer;
 
-
     /**
      * Set the serializer.
      *
diff --git a/src/PubSub/PubSubAbstract.php b/src/PubSub/PubSubAbstract.php
deleted file mode 100644
index ec10d14..0000000
--- a/src/PubSub/PubSubAbstract.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-namespace Syndicate\PubSub;
-
-use Syndicate\MessageTransformer;
-
-
-abstract class PubSubAbstract extends MessageTransformer
-{
-    /**
-     * PubSub client instance.
-     *
-     * @var mixed
-     */
-    protected $client;
-
-    /**
-     * Publish message to Subscription topic.
-     *
-     * @param string $topic
-     * @param string $data
-     * @param array $options
-     * @return void
-     */
-    abstract public function publish(string $topic, string $data, array $options = []): void;
-
-    /**
-     * Listen to a specific topic and register a handler.
-     *
-     * @param string $topic
-     * @param callable $handler
-     * @param array $options
-     * @return void
-     */
-    abstract public function listen(string $topic, callable $handler, array $options = []): void;
-
-    /**
-     * Subscribe to multiple topics with a distinct handler.
-     *
-     * @param array <string, callable>
-     * @param callable $defaultHandler
-     * @return void
-     */
-    abstract public function subscribe(array $subscriptions, callable $defaultHandler = null): void;
-}
\ No newline at end of file
diff --git a/src/PubSub/Redis.php b/src/PubSub/Redis.php
deleted file mode 100644
index f8965a1..0000000
--- a/src/PubSub/Redis.php
+++ /dev/null
@@ -1,87 +0,0 @@
-<?php
-
-namespace Syndicate\PubSub;
-
-use Predis\Client;
-use Predis\PubSub\Consumer;
-use Predis\PubSub\DispatcherLoop;
-use Syndicate\Message;
-
-/**
- * 
- * @property Client $client
- * 
- */
-class Redis extends PubSubAbstract
-{
-    /**
-     * Redis adapter constructor
-     *
-     * @param Client $redis
-     */
-    public function __construct(Client $redis)
-    {
-        $this->client = $redis;
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function publish(string $topic, string $data, array $options = []): void
-    {
-        $this->client->publish($topic, $this->serialize($data));
-    }
-
-    /**
-     *@inheritDoc
-     */
-    public function listen(string $topic, callable $handler, array $options = []): void
-    {
-        $self = $this;
-
-        $this->client->pubSubLoop(['subscribe' => $topic], function(Consumer $consumer, object $message) use ($self, $handler): void {
-
-            if( $message->kind === "message" ){
-                
-                $handler(
-                    new Message($message, $self->deserialize($message->payload))
-                );
-            }
-
-        });
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function subscribe(array $subscriptions, callable $defaultHandler = null): void
-    {
-        $consumer = $this->client->pubSubLoop();
-        $dispatcherLoop = new DispatcherLoop($consumer);
-
-        $self = $this;
-
-        foreach( $subscriptions as $topic => $handler ){
-
-            $dispatcherLoop->attachCallback($topic, function(string $message) use ($self, $handler): void {
-
-                $handler(
-                    new Message($message, $self->deserialize($message))
-                );
-
-            });
-        }
-
-        if( $defaultHandler ){
-            $dispatcherLoop->defaultCallback(function(object $message) use ($self, $defaultHandler): void {
-
-                $defaultHandler(
-                    new Message($message, $self->deserialize($message->payload))
-                );
-                
-            });
-        }
-        
-        $dispatcherLoop->run();
-    }
-}
\ No newline at end of file
diff --git a/src/PubSub/Sns.php b/src/PubSub/Sns.php
deleted file mode 100644
index 4e7a31f..0000000
--- a/src/PubSub/Sns.php
+++ /dev/null
@@ -1,46 +0,0 @@
-<?php
-
-namespace Syndicate\PubSub;
-
-use Aws\Sns\SnsClient;
-
-
-class Sns extends PubSubAbstract
-{
-    /**
-     * Sns constructor.
-     *
-     * @param SnsClient $snsClient
-     */
-    public function __construct(SnsClient $snsClient)
-    {
-        $this->client = $snsClient;
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function publish(string $topic, string $data, array $options = []): void
-    {
-        $this->client->publish([
-            "TopicArn" => $topic,
-            "Message" => $this->serialize($data)
-        ]);
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function listen(string $topic, callable $handler, array $options = []): void
-    {
-        return;
-    }
-
-    /**
-     * @inheritDoc
-     */
-    public function subscribe(array $subscriptions, callable $defaultHandler = null): void
-    {
-        return;
-    }
-}
\ No newline at end of file
diff --git a/src/Queue/Beanstalk.php b/src/Queue/Beanstalk.php
index 38d7b38..06a5ec3 100644
--- a/src/Queue/Beanstalk.php
+++ b/src/Queue/Beanstalk.php
@@ -2,15 +2,15 @@
 
 namespace Syndicate\Queue;
 
-use Pheanstalk\Job;
 use Pheanstalk\Pheanstalk;
-use Syndicate\Queue\Queue;
+use Pheanstalk\PheanstalkInterface;
 use Syndicate\Message;
+use Syndicate\Queue\Queue;
 
 /**
- * 
+ *
  * @property Pheanstalk $client
- * 
+ *
  */
 class Beanstalk extends Queue
 {
@@ -34,9 +34,9 @@ public function put($data, array $options = []): void
         $this->client->putInTube(
             $this->name,
             $this->serialize($data),
-            $options['priority'] ?? null,
-            $options['delay'] ?? null,
-            $options['ttr'] ??  null
+            $options['priority'] ?? PheanstalkInterface::DEFAULT_PRIORITY,
+            $options['delay'] ?? PheanstalkInterface::DEFAULT_DELAY,
+            $options['ttr'] ??  PheanstalkInterface::DEFAULT_TTR
         );
     }
 
@@ -45,16 +45,13 @@ public function put($data, array $options = []): void
      */
     public function get(array $options = []): ?Message
     {
-        $job = $this->client->reserveFromTube(
-            $this->name,
-            $options['timeout'] ?? null
-        );
+        $message = $this->many(1, $options);
 
-        $payload = $this->deserialize(
-            $job->getData()
-        );
+        if( empty($message) ){
+            return null;
+        }
 
-        return new Message($this, $job, $payload);
+        return $message[0];
     }
 
     /**
@@ -62,7 +59,23 @@ public function get(array $options = []): ?Message
      */
     public function many(int $max, array $options = []): array
     {
-        return [];
+        $job = $this->client->reserveFromTube(
+            $this->name,
+            $options['timeout'] ?? null
+        );
+
+		/** @psalm-suppress DocblockTypeContradiction */
+        if( empty($job) ){
+            return [];
+        }
+
+        $payload = $this->deserialize(
+            $job->getData()
+        );
+
+        return [
+            new Message($this, $job, $payload)
+        ];
     }
 
     /**
@@ -72,8 +85,8 @@ public function release(Message $message, array $options = []): void
     {
         $this->client->release(
             $message->getSourceMessage(),
-            $options['priority'] ?? null,
-            $options['delay'] ?? null
+            $options['priority'] ?? PheanstalkInterface::DEFAULT_PRIORITY,
+            $options['delay'] ?? PheanstalkInterface::DEFAULT_DELAY
         );
     }
 
diff --git a/src/Queue/Google.php b/src/Queue/Google.php
index ea86d2c..32435fd 100644
--- a/src/Queue/Google.php
+++ b/src/Queue/Google.php
@@ -9,9 +9,9 @@
 use Syndicate\Queue\Queue;
 
 /**
- * 
+ *
  * @property PubSubClient $client
- * 
+ *
  */
 class Google extends Queue
 {
@@ -79,7 +79,7 @@ public function many(int $max, array $options = []): array
                 $payload = $this->deserialize(
                     $message->data()
                 );
-    
+
                 $messages[] = new Message($this, $message, $payload);
             }
 
diff --git a/src/Queue/Queue.php b/src/Queue/Queue.php
index 3697de1..52faced 100644
--- a/src/Queue/Queue.php
+++ b/src/Queue/Queue.php
@@ -2,11 +2,9 @@
 
 namespace Syndicate\Queue;
 
-use Psr\Log\LoggerInterface;
 use Syndicate\Message;
 use Syndicate\MessageTransformer;
 
-
 abstract class Queue extends MessageTransformer
 {
     /**
@@ -23,6 +21,13 @@ abstract class Queue extends MessageTransformer
      */
     protected $client;
 
+    /**
+     * Flag signaling the queue should continue to run.
+     *
+     * @var boolean
+     */
+    protected $shouldRun = true;
+
     /**
      * Put data on the queue
      *
@@ -66,6 +71,16 @@ abstract public function delete(Message $message): void;
      */
     abstract public function release(Message $message, array $options = []): void;
 
+    /**
+     * Cease processing messages.
+     *
+     * @return void
+     */
+    public function shutdown(): void
+    {
+        $this->shouldRun = false;
+    }
+
     /**
      * Block listen for new messages on queue. Executes callback on new Message arrival.
      *
@@ -83,8 +98,10 @@ public function listen(callable $callback, int $pollingTimeout = 20): void
                 $callback($message);
             }
 
+            \pcntl_signal_dispatch();
+
         }
-        while(true);
+        while($this->shouldRun);
     }
 
     /**
diff --git a/src/Queue/Redis.php b/src/Queue/Redis.php
index 9de131c..7b00c3e 100644
--- a/src/Queue/Redis.php
+++ b/src/Queue/Redis.php
@@ -5,11 +5,10 @@
 use Predis\Client;
 use Syndicate\Message;
 
-
 /**
- * 
+ *
  * @property Client $client
- * 
+ *
  */
 class Redis extends Queue
 {
@@ -41,7 +40,7 @@ public function get(array $options = []): ?Message
         $messages = $this->many(1, $options);
         return $messages[0] ?? null;
     }
-    
+
     /**
      * @inheritDoc
      */
@@ -50,9 +49,9 @@ public function many(int $max, array $options = []): array
         $messages = [];
 
         for( $i = 0; $i < $max; $i++ ){
-            
-            if( ($message = $this->client->blpop($this->name, 0)) ){
-                $messages[] =  new Message($this, $message[1], $this->deserialize($message[1]));
+
+            if( ($message = $this->client->blpop($this->name, (int) ($options['timeout'] ?? 0))) ){
+                $messages[] = new Message($this, $message[1], $this->deserialize($message[1]));
             }
         }
 
diff --git a/src/Queue/RedisPubSub.php b/src/Queue/RedisPubSub.php
index 665e1c3..5f90c4a 100644
--- a/src/Queue/RedisPubSub.php
+++ b/src/Queue/RedisPubSub.php
@@ -8,9 +8,9 @@
 use Syndicate\Message;
 
 /**
- * 
+ *
  * @property Client $client
- * 
+ *
  */
 class RedisPubSub extends Queue
 {
@@ -87,10 +87,11 @@ public function listen(callable $callback, int $pollingTimeout = 20): void
     {
         $self = $this;
 
+		/** @psalm-suppress TooManyArguments */
         $this->client->pubSubLoop(['subscribe' => $this->name], function(Consumer $consumer, object $message) use ($callback, $self): void {
 
             if( $message->kind === "message" ){
-                
+
                 $callback(
                     new Message($self, $message, $self->deserialize($message->payload))
                 );
diff --git a/src/Queue/Sqs.php b/src/Queue/Sqs.php
index 5e720aa..a003dc9 100644
--- a/src/Queue/Sqs.php
+++ b/src/Queue/Sqs.php
@@ -7,9 +7,9 @@
 use Syndicate\Message;
 
 /**
- * 
+ *
  * @property SqsClient $client
- * 
+ *
  */
 class Sqs extends Queue
 {
diff --git a/src/Router.php b/src/Router.php
index 5d98689..0e40579 100644
--- a/src/Router.php
+++ b/src/Router.php
@@ -34,7 +34,7 @@ public function __construct(callable $resolver, array $routes = [])
 
     /**
      * Match the Message to a route handler.
-     * 
+     *
      * Returns a handler on successful route match.
      *
      * @param Message $message
diff --git a/tests/DispatcherTest.php b/tests/DispatcherTest.php
index aa497a1..17e558f 100644
--- a/tests/DispatcherTest.php
+++ b/tests/DispatcherTest.php
@@ -1,9 +1,10 @@
 <?php
 
-namespace Shuttle\Tests;
+namespace Syndicate\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Syndicate\Dispatcher;
+use Syndicate\DispatchException;
 use Syndicate\Message;
 use Syndicate\Queue\MockQueue;
 use Syndicate\Router;
@@ -14,6 +15,7 @@
  * @covers Syndicate\Queue\MockQueue
  * @covers Syndicate\Message
  * @covers Syndicate\MessageTransformer
+ * @covers Syndicate\DispatchException
  */
 class DispatcherTest extends TestCase
 {
@@ -120,7 +122,7 @@ function(Message $message, $route): bool
 
         $dispatcher = new Dispatcher($router);
 
-        $this->expectException(\Exception::class);
+        $this->expectException(DispatchException::class);
         $dispatcher->dispatch($queue->get());
     }
 }
\ No newline at end of file