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If not, see . diff --git a/akka-samples/akka-sample-persistence-java-lambda/tutorial/index.html b/akka-samples/akka-sample-persistence-java-lambda/tutorial/index.html new file mode 100644 index 00000000000..4a1ee727d3a --- /dev/null +++ b/akka-samples/akka-sample-persistence-java-lambda/tutorial/index.html @@ -0,0 +1,137 @@ + + +Akka Persistence Samples in Java with Lambdas + + + + +
+

Akka Persistence Samples

+

+This tutorial contains examples that illustrate a subset of +Akka Persistence features. +

+ + +

+Custom storage locations for the journal and snapshots can be defined in +application.conf. +

+
+ +
+

Processors and channels

+

+ProcessorChannelExample.java +defines an ExampleProcessor and an ExampleDestination. The processor sends messages to a +destination via a channel. The destination confirms the delivery of these messages so that replayed messages aren't +redundantly delivered to the destination. Repeated runs of the application demonstrates that the processor receives +both replayed and new messages whereas the channel only receives new messages, sent by the application. The processor +also receives replies from the destination, demonstrating that a channel preserves sender references. +

+ +

+To run this example, go to the Run tab, and run the application main class +sample.persistence.ProcessorChannelExample several times. +

+
+ +
+

Processor snapshots

+

+SnapshotExample.java +demonstrates how processors can take snapshots of application state and recover from previously stored snapshots. +Snapshots are offered to processors at the beginning of recovery, before any messages (younger than the snapshot) +are replayed. +

+ +

+To run this example, go to the Run tab, and run the application main class +sample.persistence.SnapshotExample several times. With every run, the state offered by the +most recent snapshot is printed to stdout, followed by the updated state after sending new persistent +messages to the processor. +

+
+ +
+

Eventsourced processors

+

+EventsourcedExample.java +is described in detail in the Event sourcing +section of the user documentation. With every application run, the ExampleProcessor is recovered from +events stored in previous application runs, processes new commands, stores new events and snapshots and prints the +current processor state to stdout. +

+ +

+To run this example, go to the Run tab, and run the application main class +sample.persistence.EventsourcedExample several times. +

+
+ +
+

Processor failure handling

+

+ProcessorFailureExample.java +shows how a processor can delete persistent messages from the journal if they threw an exception. Throwing an exception +restarts the processor and replays messages. In order to prevent that the message that caused the exception is replayed, +it is marked as deleted in the journal (during invocation of preRestart). This is a common pattern in +command-sourcing to compensate write-ahead logging of messages. +

+ +

+To run this example, go to the Run tab, and run the application main class +sample.persistence.ProcessorFailureExample several times. +

+ +

+Event sourcing +on the other hand, does not persist commands directly but rather events that have been derived from received commands +(not shown here). These events are known to be successfully applicable to current processor state i.e. there's +no need for deleting them from the journal. Event sourced processors usually have a lower throughput than command +sourced processors, as the maximum size of a write batch is limited by the number of persisted events per received +command. +

+
+ +
+

Processor views

+

+ViewExample.java demonstrates +how a view (ExampleView) is updated with the persistent message stream of a processor +(ExampleProcessor). Messages sent to the processor are read from stdin. Views also support +snapshotting and can be used in combination with channels in the same way as processors. +

+ +

+To run this example, go to the Run tab, and run the application main class +sample.persistence.ViewExample. +

+ +

+Views can also receive events that have been persisted by event sourced processors (not shown). +

+
+ +
+

Processor conversation recovery

+

+ConversationRecoveryExample.java +defines two processors that send messages to each other via channels. The reliable delivery properties of channels, +in combination with processors, allow these processors to automatically resume their conversation after a JVM crash. +

+

+To run this example, go to the Run tab, and run the application main class +sample.persistence.ConversationRecoveryExample several times. +

+
+ + + diff --git a/akka-samples/akka-sample-persistence-java/tutorial/index.html b/akka-samples/akka-sample-persistence-java/tutorial/index.html index 9b0c6aae61e..b39973c14cb 100644 --- a/akka-samples/akka-sample-persistence-java/tutorial/index.html +++ b/akka-samples/akka-sample-persistence-java/tutorial/index.html @@ -1,11 +1,12 @@ -Akka Persistence Samples with Scala +Akka Persistence Samples in Java
+

Akka Persistence Samples

This tutorial contains examples that illustrate a subset of Akka Persistence features. diff --git a/akka-samples/akka-sample-supervision-java-lambda/activator.properties b/akka-samples/akka-sample-supervision-java-lambda/activator.properties index 083d7ca33af..d85adf336e9 100644 --- a/akka-samples/akka-sample-supervision-java-lambda/activator.properties +++ b/akka-samples/akka-sample-supervision-java-lambda/activator.properties @@ -2,3 +2,6 @@ name=akka-supervision-java-lambda title=Akka Supervision in Java with Lambdas description=Illustrates supervision in Akka tags=akka,java,java8,sample +authorName=Akka Team +authorLink=http://akka.io/ +sourceLink=https://github.com/akka/akka