From 2e275b074fcda0d063274ac37d6f59c4da602afe Mon Sep 17 00:00:00 2001
From: Richard Fullmer <richardfullmer@gmail.com>
Date: Wed, 25 Jan 2012 17:11:08 -0500
Subject: [PATCH] Support a message consumption amount for rpc servers,
 infinite by default

---
 Command/RpcServerCommand.php |  8 +++++++-
 RabbitMq/RpcServer.php       | 21 ++++++++++++++++++++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/Command/RpcServerCommand.php b/Command/RpcServerCommand.php
index 040b8bba..6f25aba3 100644
--- a/Command/RpcServerCommand.php
+++ b/Command/RpcServerCommand.php
@@ -18,6 +18,7 @@ protected function configure()
         $this
             ->setName('rabbitmq:rpc-server')
             ->addArgument('name', InputArgument::REQUIRED, 'Server Name')
+            ->addOption('messages', 'm', InputOption::VALUE_OPTIONAL, 'Messages to consume', 0)
             ->addOption('debug', 'd', InputOption::VALUE_OPTIONAL, 'Debug mode', false)
         ;
     }
@@ -35,9 +36,14 @@ protected function configure()
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         define('AMQP_DEBUG', (bool) $input->getOption('debug'));
+        $amount = $input->getOption('messages');
+
+        if (0 > $amount) {
+            throw new InvalidArgumentException("The -m option should be null or greater than 0");
+        }
 
         $server = $this->getContainer()
                        ->get(sprintf('old_sound_rabbit_mq.%s_server', $input->getArgument('name')))
-                       ->start();
+                       ->start($amount);
     }
 }
\ No newline at end of file
diff --git a/RabbitMq/RpcServer.php b/RabbitMq/RpcServer.php
index 49041643..3beb046f 100644
--- a/RabbitMq/RpcServer.php
+++ b/RabbitMq/RpcServer.php
@@ -7,14 +7,20 @@
 
 class RpcServer extends BaseConsumer
 {
+    protected $target;
+
+    protected $consumed = 0;
+
     public function initServer($name)
     {
         $this->setExchangeOptions(array('name' => $name, 'type' => 'direct'));
         $this->setQueueOptions(array('name' => $name . '-queue'));
     }
 
-    public function start()
+    public function start($msgAmount = 0)
     {
+        $this->target = $msgAmount;
+
         $this->setUpConsumer();
 
         while (count($this->ch->callbacks))
@@ -30,6 +36,8 @@ public function processMessage(AMQPMessage $msg)
             $msg->delivery_info['channel']->basic_ack($msg->delivery_info['delivery_tag']);
             $result = call_user_func($this->callback, $msg);
             $this->sendReply(serialize($result), $msg->get('reply_to'), $msg->get('correlation_id'));
+            $this->consumed++;
+            $this->maybeStopConsumer();
         }
         catch (\Exception $e)
         {
@@ -42,4 +50,15 @@ protected function sendReply($result, $client, $correlationId)
         $reply = new AMQPMessage($result, array('content_type' => 'text/plain', 'correlation_id' => $correlationId));
         $this->ch->basic_publish($reply, '', $client);
     }
+
+    protected function maybeStopConsumer()
+    {
+        if ($this->target == 0) {
+            return;
+        }
+
+        if ($this->consumed == $this->target) {
+            $this->stopConsuming();
+        }
+    }
 }
\ No newline at end of file