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POExample of integration Akka with existing java project
 

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  1. POExample of integration Akka with existing java project
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    <p>If I already have existing <code>java</code> web application that uses <code>spring</code> and <code>servlet</code> container. What is the proper way to integrate Akka in it? </p> <p>Like I'g going to have <code>Actor1</code> and <code>Actor2</code> that communicate with each other. What would be the entry point to start using those actors? (like: 1. put it there 2. change config 3. get reference to actor)</p> <p>I found <a href="http://doc.akka.io/docs/akka/2.2-M3/general/configuration.html" rel="nofollow noreferrer">http://doc.akka.io/docs/akka/2.2-M3/general/configuration.html</a> But his does not provide me a glue. Just want to get real example of integration.</p> <p>Is there some simple integration example?</p> <p><strong>EDIT:</strong> Application does some search, getting some data from outside, storing info to files.</p> <p>The application is quite big. Some components/object can leave their own life, that is out of direct client requests, it can do some things is parallel. Like some singleton objects that has mutable state in it. </p> <p>The thing is I do not know exactly where I can apply Actors, I'm investigation it. But what I have already is lots of synchronized blocks here and there. </p> <p>And, it is already, I believe, kind of sign that the actors might be applied. <em>(because I'm not sure, maybe I forgot to put some <strong>synchronized</strong>, and of course there are no integration tests for it)</em></p> <p>About configuration, I'm just not sure should I configure some application.conf for let Actrors/Akka live there (<strong>since documentation itself describes it</strong>).</p> <p>What I see: </p> <pre><code>@Component("someManager") public class SomeManager { List&lt;Some&gt; something; // mutable state, that why I use locks here. // methods: add(), delete(), update() } </code></pre> <p>I could make it <code>SomeManagerActor</code></p> <p><code>SomeManager</code> is used from <code>controller</code>. Thus, it would be nice to have controller Actor as well ? I it want to receive feedback into (<code>onReceive</code>() method).</p> <p>This is kind of disputable... That's one more reason why I need some <strong>example</strong>.</p> <p>I believe I can improve application by getting rid of all <code>synchronized/whait/notify</code> stuff, moving responsibilities to actors, using messages as a way of communication with/between them.</p> <p>Or like <a href="https://stackoverflow.com/questions/11576439/parallel-file-processing-in-scala">this</a> it could be the <strong>actor to write to property files</strong>: </p> <p><strong>EDIT:</strong></p> <p>For example, for now what I found: To make Actor1 send message to Actor2 I use a trick:</p> <pre><code>// somewhere in existing code public void initActors() { ActorSystem system = ActorSystem.create(example"); // initializing final ActorRef actor1 = system.actorOf(Props.create(Actor1.class), "actor1"); } </code></pre> <p>Actor1 has a method <code>preStart()</code> that is started as soon as I get reference to it (above). And it sends message to Actor2:</p> <pre><code>@Override public void preStart() { </code></pre> <blockquote> <p>But I'm not sure that it is good why to initialize two actors to do their work.</p> </blockquote>
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    1. COIt would help if you said what your application is and why you need akka. I don't see why you would need akka for a web application since you already have messages and asynchronous methods (Java EE6).
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