ef9e64d791
This one is created instead of the batching pattern of #12702, as suggested by @ktoso in #12702's discussion.
94 lines
2.6 KiB
HTML
94 lines
2.6 KiB
HTML
<!-- <html> -->
|
|
<head>
|
|
<title>Akka FSM in Scala</title>
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<div>
|
|
<h2>Finite State Machine in Actors</h2>
|
|
|
|
<p>
|
|
This sample is an adaptation of
|
|
<a href="http://www.dalnefre.com/wp/2010/08/dining-philosophers-in-humus/" target="_blank">Dining Hakkers</a>.
|
|
It illustrates how state and behavior can be managed within
|
|
an Actor with two different approaches; using <code>become</code> and using
|
|
the <code>FSM</code> trait.
|
|
The sample also contains an implementation of a simple redelivering actor implemented as a FSM.
|
|
</p>
|
|
|
|
|
|
</div>
|
|
<div>
|
|
|
|
<h2>Dining Hakkers with Become</h2>
|
|
|
|
<p>
|
|
Open <a href="#code/src/main/scala/sample/become/DiningHakkersOnBecome.scala" class="shortcut">DiningHakkersOnBecome.scala</a>.
|
|
</p>
|
|
|
|
<p>
|
|
It illustrates how current behavior can be replaced with <code>context.become</code>.
|
|
Note that no <code>var</code> members are used, instead the state is encoded in the current
|
|
behavior and its parameters.
|
|
</p>
|
|
|
|
<p>
|
|
Go to the <a href="#run" class="shortcut">Run</a> tab, and start the application's main class
|
|
<code>sample.become.DiningHakkersOnBecome</code>.
|
|
In the log output you can see the actions of the <code>Hakker</code> actors.
|
|
</p>
|
|
|
|
<p>
|
|
Read more about <code>become</code> in
|
|
<a href="http://doc.akka.io/docs/akka/2.4-SNAPSHOT/scala/actors.html#Become_Unbecome" target="_blank">the documentation</a>.
|
|
</p>
|
|
|
|
</div>
|
|
<div>
|
|
|
|
<h2>Dining Hakkers with FSM</h2>
|
|
|
|
<p>
|
|
Open <a href="#code/src/main/scala/sample/fsm/DiningHakkersOnFsm.scala" class="shortcut">DiningHakkersOnFsm.scala</a>.
|
|
</p>
|
|
|
|
<p>
|
|
It illustrates how the states and transitions can be defined with the <code>akka.actor.FSM</code> trait.
|
|
</p>
|
|
|
|
<p>
|
|
Go to the <a href="#run" class="shortcut">Run</a> tab, and start the application's main class
|
|
<code>sample.fsm.DiningHakkersOnFsm</code>.
|
|
In the log output you can see the actions of the <code>Hakker</code> actors.
|
|
</p>
|
|
|
|
<p>
|
|
Read more about <code>akka.actor.FSM</code> in
|
|
<a href="http://doc.akka.io/docs/akka/2.4-SNAPSHOT/scala/fsm.html" target="_blank">the documentation</a>.
|
|
</p>
|
|
|
|
</div>
|
|
<div>
|
|
|
|
<h2>Simple redelivering FSM</h2>
|
|
|
|
<p>
|
|
Open <a href="#code/src/main/scala/sample/redelivery/FsmSimpleRedelivery.scala" class="shortcut">FsmSimpleRedelivery.scala</a>.
|
|
</p>
|
|
|
|
<p>
|
|
It illustrates how you can take care of message redelivery between two or more sides.
|
|
This implementation is able to process only one message at a time.
|
|
</p>
|
|
|
|
<p>
|
|
Go to the <a href="#run" class="shortcut">Run</a> tab, and start the application's main class
|
|
<code>sample.redelivery.FsmSimpleRedelivery</code>.
|
|
In the log output you can see the actions of the <code>Requester</code> and the <code>Receiver</code> actors.
|
|
</p>
|
|
|
|
</div>
|
|
|
|
</body>
|
|
</html>
|