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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<meta name="description" content="JDeferred : Java Deferred / Promise library">
<link rel="stylesheet" type="text/css" media="screen" href="stylesheets/stylesheet.css">
<title>JDeferred</title>
</head>
<body>
<!-- HEADER -->
<div id="header_wrap" class="outer">
<header class="inner">
<a id="forkme_banner" href="https://github.com/jdeferred">View on GitHub</a>
<h1 id="project_title">JDeferred</h1>
<h2 id="project_tagline">Java Deferred / Promise library</h2>
</header>
</div>
<!-- MAIN CONTENT -->
<div id="main_content_wrap" class="outer">
<section id="main_content" class="inner">
<h1>
<a id="jdeferred" class="anchor" href="#jdeferred" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>JDeferred</h1>
<p>JDeferred is a Java Deferred/Promise library similar to JQuery's Deferred Object.</p>
<p>Inspired by <a href="https://github.com/jquery/jquery">JQuery</a> and <a href="https://github.com/CodeAndMagic/android-deferred-object">Android Deferred Object</a>.</p>
<h2>
<a id="features" class="anchor" href="#features" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="features"></a>Features</h2>
<ul>
<li>Deferred object and Promise</li>
<li>Promise callbacks
<ul>
<li><code>.then(…)</code></li>
<li><code>.done(…)</code></li>
<li><code>.fail(…)</code></li>
<li><code>.progress(…)</code></li>
<li><code>.always(…)</code></li>
</ul>
</li>
<li>Multiple promises
<ul>
<li><code>.when(p1, p2, p3, …).then(…)</code></li>
</ul>
</li>
<li>Callable and Runnable wrappers
<ul>
<li><code>.when(new Runnable() {…})</code></li>
</ul>
</li>
<li>Uses Executor Service</li>
<li>Java Generics support
<ul>
<li><code>Deferred<Integer, Exception, Double> deferred;</code></li>
<li><code>deferred.resolve(10);</code></li>
<li><code>deferred.reject(new Exception());</code></li>
<li><code>deferred.notify(0.80);</code></li>
</ul>
</li>
<li>Android Support</li>
<li>Java 8 Lambda friendly</li>
<li>Yes it's on Maven Central Repository!</li>
</ul>
<h2>
<a id="maven" class="anchor" href="#maven" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Maven</h2>
<div class="highlight highlight-text-xml"><pre><<span class="pl-ent">dependency</span>>
<<span class="pl-ent">groupId</span>>org.jdeferred</<span class="pl-ent">groupId</span>>
<<span class="pl-ent">artifactId</span>>jdeferred-core</<span class="pl-ent">artifactId</span>>
<<span class="pl-ent">version</span>>${version}</<span class="pl-ent">version</span>>
</<span class="pl-ent">dependency</span>></pre></div>
<h2>
<a id="gradle" class="anchor" href="#gradle" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Gradle</h2>
<pre><code>compile 'org.jdeferred:jdeferred-android-aar:${version}'
// or
compile 'org.jdeferred:jdeferred-android-aar:${version}@aar'
</code></pre>
<p>Find available versions on <a href="http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.jdeferred%22%20AND%20a%3A%22jdeferred-core%22">Maven Central Repository</a>.</p>
<h1>
<a id="quick-examples" class="anchor" href="#quick-examples" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="examples"></a>Quick Examples</h1>
<h2>
<a id="deferred-object-and-promise" class="anchor" href="#deferred-object-and-promise" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="examples-deferred-promise"></a>Deferred object and Promise</h2>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">Deferred</span> deferred <span class="pl-k">=</span> <span class="pl-k">new</span> <span class="pl-smi">DeferredObject</span>();
<span class="pl-smi">Promise</span> promise <span class="pl-k">=</span> deferred<span class="pl-k">.</span>promise();
promise<span class="pl-k">.</span>done(<span class="pl-k">new</span> <span class="pl-smi">DoneCallback</span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onDone</span>(<span class="pl-smi">Object</span> <span class="pl-v">result</span>) {
<span class="pl-c1">...</span>
}
})<span class="pl-k">.</span>fail(<span class="pl-k">new</span> <span class="pl-smi">FailCallback</span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onFail</span>(<span class="pl-smi">Object</span> <span class="pl-v">rejection</span>) {
<span class="pl-c1">...</span>
}
})<span class="pl-k">.</span>progress(<span class="pl-k">new</span> <span class="pl-smi">ProgressCallback</span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onProgress</span>(<span class="pl-smi">Object</span> <span class="pl-v">progress</span>) {
<span class="pl-c1">...</span>
}
})<span class="pl-k">.</span>always(<span class="pl-k">new</span> <span class="pl-smi">AlwaysCallback</span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onAlways</span>(<span class="pl-smi">State</span> <span class="pl-v">state</span>, <span class="pl-smi">Object</span> <span class="pl-v">result</span>, <span class="pl-smi">Object</span> <span class="pl-v">rejection</span>) {
<span class="pl-c1">...</span>
}
});</pre></div>
<p>With the reference to deferred object, you can then trigger actions/updates:</p>
<div class="highlight highlight-source-java"><pre>deferred<span class="pl-k">.</span>resolve(<span class="pl-s"><span class="pl-pds">"</span>done<span class="pl-pds">"</span></span>);
deferred<span class="pl-k">.</span>reject(<span class="pl-s"><span class="pl-pds">"</span>oops<span class="pl-pds">"</span></span>);
deferred<span class="pl-k">.</span>notify(<span class="pl-s"><span class="pl-pds">"</span>100%<span class="pl-pds">"</span></span>);</pre></div>
<h2>
<a id="filter" class="anchor" href="#filter" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-filter"></a>Filter</h2>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">Deferred</span> d <span class="pl-k">=</span> …;
<span class="pl-smi">Promise</span> p <span class="pl-k">=</span> d<span class="pl-k">.</span>promise();
<span class="pl-smi">Promise</span> filtered <span class="pl-k">=</span> p<span class="pl-k">.</span>then(<span class="pl-k">new</span> <span class="pl-k">DoneFilter<<span class="pl-smi">Integer</span>, <span class="pl-smi">Integer</span>></span>() {
<span class="pl-k">public</span> <span class="pl-smi">Integer</span> <span class="pl-en">filterDone</span>(<span class="pl-smi">Integer</span> <span class="pl-v">result</span>)
return result * 10;
}
});
filtered<span class="pl-k">.</span>done(<span class="pl-k">new</span> <span class="pl-k">DoneCallback<<span class="pl-smi">Integer</span>></span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onDone</span>(<span class="pl-smi">Integer</span> <span class="pl-v">result</span>) {
<span class="pl-c">// result would be original * 10</span>
<span class="pl-smi">System</span><span class="pl-k">.</span>out<span class="pl-k">.</span>println(result);
}
});
d<span class="pl-k">.</span>resolve(<span class="pl-c1">3</span>) <span class="pl-k">-</span><span class="pl-k">></span> <span class="pl-c1">30.</span></pre></div>
<h2>
<a id="pipe" class="anchor" href="#pipe" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-pipe"></a>Pipe</h2>
<blockquote>
<p>Since 1.1.0-Beta1</p>
</blockquote>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">Deferred</span> d <span class="pl-k">=</span> <span class="pl-c1">...</span>;
<span class="pl-smi">Promise</span> p <span class="pl-k">=</span> d<span class="pl-k">.</span>promise();
p<span class="pl-k">.</span>then(<span class="pl-k">new</span> <span class="pl-k">DonePipe<<span class="pl-smi">Integer</span>, <span class="pl-smi">Integer</span>, <span class="pl-smi">Exception</span>, <span class="pl-smi">Void</span>></span>() {
<span class="pl-k">public</span> <span class="pl-k">Deferred<<span class="pl-smi">Integer</span>, <span class="pl-smi">Exception</span>, <span class="pl-smi">Void</span>></span> <span class="pl-en">pipeDone</span>(<span class="pl-smi">Integer</span> <span class="pl-v">result</span>) {
<span class="pl-k">if</span> (result <span class="pl-k"><</span> <span class="pl-c1">100</span>) {
<span class="pl-k">return</span> <span class="pl-k">new</span> <span class="pl-k">DeferredObject<<span class="pl-smi">Integer</span>, <span class="pl-smi">Void</span>, <span class="pl-smi">Void</span>></span>()<span class="pl-k">.</span>resolve(result);
} <span class="pl-k">else</span> {
<span class="pl-k">return</span> <span class="pl-k">new</span> <span class="pl-k">DeferredObject<<span class="pl-smi">Integer</span>, <span class="pl-smi">Void</span>, <span class="pl-smi">Void</span>></span>()<span class="pl-k">.</span>reject(<span class="pl-k">new</span> <span class="pl-smi">Exception</span>(<span class="pl-c1">...</span>));
}
}
})<span class="pl-k">.</span>done(<span class="pl-c1">...</span>)<span class="pl-k">.</span>fail(<span class="pl-c1">...</span>);
d<span class="pl-k">.</span>resolve(<span class="pl-c1">80</span>) <span class="pl-k">-</span><span class="pl-k">></span> done<span class="pl-k">!</span>
d<span class="pl-k">.</span>resolve(<span class="pl-c1">100</span>) <span class="pl-k">-</span><span class="pl-k">></span> fail<span class="pl-k">!</span>
</pre></div>
<h2>
<a id="deferred-manager" class="anchor" href="#deferred-manager" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-dm"></a>Deferred Manager</h2>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">DeferredManager</span> dm <span class="pl-k">=</span> <span class="pl-k">new</span> <span class="pl-smi">DefaultDeferredManager</span>();
<span class="pl-smi">Promise</span> p1, p2, p3;
<span class="pl-c">// initialize p1, p2, p3</span>
dm<span class="pl-k">.</span>when(p1, p2, p3)
.done(…)
.fail(…)</pre></div>
<p>You can also specify a Executor Service for your need.</p>
<pre><code>DeferredManager dm = new DefaultDeferredManager(myExecutorService);
</code></pre>
<h2>
<a id="runnable-and-callable" class="anchor" href="#runnable-and-callable" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-runnable-callable"></a>Runnable and Callable</h2>
<p>You can use Callable and Runnable almost like a Promise without any additional work.</p>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">DeferredManager</span> dm <span class="pl-k">=</span> <span class="pl-k">new</span> <span class="pl-smi">DefaultDeferredManager</span>();
dm<span class="pl-k">.</span>when(<span class="pl-k">new</span> <span class="pl-k">Callable<<span class="pl-smi">Integer</span>></span>(){
<span class="pl-k">public</span> <span class="pl-smi">Integer</span> <span class="pl-en">call</span>() {
<span class="pl-c">// return something</span>
<span class="pl-c">// or throw a new exception</span>
}
})<span class="pl-k">.</span>done(<span class="pl-k">new</span> <span class="pl-k">DoneCallback<<span class="pl-smi">Integer</span>></span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onDone</span>(<span class="pl-smi">Integer</span> <span class="pl-v">result</span>) {
<span class="pl-c1">...</span>
}
})<span class="pl-k">.</span>fail(<span class="pl-k">new</span> <span class="pl-k">FailCallback<<span class="pl-smi">Throwable</span>></span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onFail</span>(<span class="pl-smi">Throwable</span> <span class="pl-v">e</span>) {
<span class="pl-c1">...</span>
}
});</pre></div>
<p>If you need to notify progress within your Callable or Runnable, you either need to create your own Deferred object and Promise, or you can use DeferredCallable and DeferredRunnable.</p>
<p>Use your own Deferred object</p>
<div class="highlight highlight-source-java"><pre><span class="pl-k">final</span> <span class="pl-smi">Deferred</span> deferred <span class="pl-k">=</span> <span class="pl-c1">...</span>
<span class="pl-smi">Promise</span> promise <span class="pl-k">=</span> deferred<span class="pl-k">.</span>promise();
promise<span class="pl-k">.</span>then(…);
<span class="pl-smi">Runnable</span> r <span class="pl-k">=</span> <span class="pl-k">new</span> <span class="pl-smi">Runnable</span>() {
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">run</span>() {
<span class="pl-k">while</span> (…) {
deferred<span class="pl-k">.</span>notify(myProgress);
}
deferred<span class="pl-k">.</span>resolve(<span class="pl-s"><span class="pl-pds">"</span>done<span class="pl-pds">"</span></span>);
}
}</pre></div>
<p>Or, extending DeferredRunnable</p>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">DeferredManager</span> dm <span class="pl-k">=</span> …;
dm<span class="pl-k">.</span>when(<span class="pl-k">new</span> <span class="pl-k">DeferredRunnable<<span class="pl-smi">Double</span>></span>(){
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">run</span>() {
<span class="pl-k">while</span> (…) {
notify(myProgress);
}
}
})<span class="pl-k">.</span>then(…);</pre></div>
<h2>
<a id="wait-and-waitsafely" class="anchor" href="#wait-and-waitsafely" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-wait"></a>Wait and WaitSafely</h2>
<blockquote>
<p>Since 1.0.1</p>
</blockquote>
<p>Normally, when using this framework, you would want to do things asynchronously. However, if there is a need to wait for all deferred tasks to finish, you can use Object.wait or Promise.waitSafely methods.</p>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">Promise</span> p <span class="pl-k">=</span> dm<span class="pl-k">.</span>when(<span class="pl-c1">...</span>)
.done(<span class="pl-c1">...</span>)
.fail(<span class="pl-c1">...</span>)
<span class="pl-k">synchronized</span> (p)
<span class="pl-k">while</span> (p<span class="pl-k">.</span>isPending()) {
<span class="pl-k">try</span> {
p<span class="pl-k">.</span>wait();
} <span class="pl-k">catch</span> (<span class="pl-smi">InterruptedException</span> e) { <span class="pl-c1">...</span> }
}
}</pre></div>
<p>Alternatively, you can use a more simplified shortcut</p>
<div class="highlight highlight-source-java"><pre><span class="pl-smi">Promise</span> p <span class="pl-k">=</span> dm<span class="pl-k">.</span>when(<span class="pl-c1">...</span>)
.done(<span class="pl-c1">...</span>)
.fail(<span class="pl-c1">...</span>)
<span class="pl-k">try</span> {
p<span class="pl-k">.</span>waitSafely();
} <span class="pl-k">catch</span> (<span class="pl-smi">InterruptedException</span> e) {
<span class="pl-c1">...</span>
}</pre></div>
<h2>
<a id="android-support" class="anchor" href="#android-support" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-android"></a>Android Support</h2>
<blockquote>
<p>Since 1.1.0-Beta1</p>
</blockquote>
<p><code>jdeferred-android</code> is now available, and it can be included just like any other Android libraries!
It also uses Android Maven pugin and builts apklib file. If you use Android Maven plugin, you can include
dependency:</p>
<p>APKLIB:</p>
<div class="highlight highlight-text-xml"><pre><<span class="pl-ent">dependency</span>>
<<span class="pl-ent">groupId</span>>org.jdeferred</<span class="pl-ent">groupId</span>>
<<span class="pl-ent">artifactId</span>>jdeferred-android</<span class="pl-ent">artifactId</span>>
<<span class="pl-ent">version</span>>...</<span class="pl-ent">version</span>>
<<span class="pl-ent">type</span>>apklib</<span class="pl-ent">type</span>>
</<span class="pl-ent">dependency</span>></pre></div>
<p>AAR:</p>
<blockquote>
<p>Since 1.2.0-Beta1</p>
</blockquote>
<div class="highlight highlight-text-xml"><pre><<span class="pl-ent">dependency</span>>
<<span class="pl-ent">groupId</span>>org.jdeferred</<span class="pl-ent">groupId</span>>
<<span class="pl-ent">artifactId</span>>jdeferred-android-aar</<span class="pl-ent">artifactId</span>>
<<span class="pl-ent">version</span>>...</<span class="pl-ent">version</span>>
<<span class="pl-ent">type</span>>aar</<span class="pl-ent">type</span>>
</<span class="pl-ent">dependency</span>></pre></div>
<p><code>jdeferred-android</code> introduces a new <code>DeferredManager</code> implementation called <code>AndroidDeferredManager</code>.
<code>AndroidDeferredManager</code> makes sure that callbacks are executed in UI Thread rather than background Thread
in order for callbacks to make UI updates. Alternatively, callbacks can also implement <code>AndroidExecutionScopeable</code>
interface to fine-grain control whether the callback should execute in UI Thread or background Thread.</p>
<p><code>AndroidDeferredManager</code> also supports new <code>DeferredAsyncTask</code> object. This object is based on
Android's <code>AsyncTask</code>.</p>
<p>If you need to always execute callbacks in background thread, then you can continue to use <code>DefaultDeferredManager</code>.</p>
<p>Lastly, because JDeferred use SLF4J - you can further route log messages using <code>slf4j-android</code>.</p>
<h2>
<a id="asynchronous-servlet" class="anchor" href="#asynchronous-servlet" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-async-servlet"></a>Asynchronous Servlet</h2>
<p>Here is a sample code on how to use JDeferred with Asynchronous Servlet!</p>
<div class="highlight highlight-source-java"><pre>@WebServlet(value <span class="pl-k">=</span> <span class="pl-s"><span class="pl-pds">"</span>/AsyncServlet<span class="pl-pds">"</span></span>, asyncSupported <span class="pl-k">=</span> <span class="pl-c1">true</span>)
<span class="pl-k">public</span> <span class="pl-k">class</span> <span class="pl-en">AsyncServlet</span> <span class="pl-k">extends</span> <span class="pl-e">HttpServlet</span> {
<span class="pl-k">private</span> <span class="pl-k">static</span> <span class="pl-k">final</span> <span class="pl-k">long</span> serialVersionUID <span class="pl-k">=</span> <span class="pl-c1">1L</span>;
<span class="pl-k">private</span> <span class="pl-smi">ExecutorService</span> executorService <span class="pl-k">=</span> <span class="pl-smi">Executors</span><span class="pl-k">.</span>newCachedThreadPool();
<span class="pl-k">private</span> <span class="pl-smi">DeferredManager</span> dm <span class="pl-k">=</span> <span class="pl-k">new</span> <span class="pl-smi">DefaultDeferredManager</span>(executorService);
<span class="pl-k">protected</span> <span class="pl-k">void</span> <span class="pl-en">doGet</span>(<span class="pl-smi">HttpServletRequest</span> <span class="pl-v">request</span>,
<span class="pl-smi">HttpServletResponse</span> <span class="pl-v">response</span>) <span class="pl-k">throws</span> <span class="pl-smi">ServletException</span>, <span class="pl-smi">IOException</span> {
<span class="pl-k">final</span> <span class="pl-smi">AsyncContext</span> actx <span class="pl-k">=</span> request<span class="pl-k">.</span>startAsync(request, response);
dm<span class="pl-k">.</span>when(<span class="pl-k">new</span> <span class="pl-k">Callable<<span class="pl-smi">String</span>></span>() {
<span class="pl-k">@Override</span>
<span class="pl-k">public</span> <span class="pl-smi">String</span> <span class="pl-en">call</span>() <span class="pl-k">throws</span> <span class="pl-smi">Exception</span> {
<span class="pl-k">if</span> (actx<span class="pl-k">.</span>getRequest()<span class="pl-k">.</span>getParameter(<span class="pl-s"><span class="pl-pds">"</span>fail<span class="pl-pds">"</span></span>) <span class="pl-k">!=</span> <span class="pl-c1">null</span>) {
<span class="pl-k">throw</span> <span class="pl-k">new</span> <span class="pl-smi">Exception</span>(<span class="pl-s"><span class="pl-pds">"</span>oops!<span class="pl-pds">"</span></span>);
}
<span class="pl-smi">Thread</span><span class="pl-k">.</span>sleep(<span class="pl-c1">2000</span>);
<span class="pl-k">return</span> <span class="pl-s"><span class="pl-pds">"</span>Hello World!<span class="pl-pds">"</span></span>;
}
})<span class="pl-k">.</span>then(<span class="pl-k">new</span> <span class="pl-k">DoneCallback<<span class="pl-smi">String</span>></span>() {
<span class="pl-k">@Override</span>
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onDone</span>(<span class="pl-smi">String</span> <span class="pl-v">result</span>) {
actx<span class="pl-k">.</span>getRequest()<span class="pl-k">.</span>setAttribute(<span class="pl-s"><span class="pl-pds">"</span>message<span class="pl-pds">"</span></span>, result);
actx<span class="pl-k">.</span>dispatch(<span class="pl-s"><span class="pl-pds">"</span>/hello.jsp<span class="pl-pds">"</span></span>);
}
})<span class="pl-k">.</span>fail(<span class="pl-k">new</span> <span class="pl-k">FailCallback<<span class="pl-smi">Throwable</span>></span>() {
<span class="pl-k">@Override</span>
<span class="pl-k">public</span> <span class="pl-k">void</span> <span class="pl-en">onFail</span>(<span class="pl-smi">Throwable</span> <span class="pl-v">exception</span>) {
actx<span class="pl-k">.</span>getRequest()<span class="pl-k">.</span>setAttribute(<span class="pl-s"><span class="pl-pds">"</span>exception<span class="pl-pds">"</span></span>, exception);
actx<span class="pl-k">.</span>dispatch(<span class="pl-s"><span class="pl-pds">"</span>/error.jsp<span class="pl-pds">"</span></span>);
}
});
}
}</pre></div>
<h2>
<a id="java-8-lambda" class="anchor" href="#java-8-lambda" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-lambda"></a>Java 8 Lambda</h2>
<p>Now this is pretty cool when used with Java 8 Lambda!</p>
<div class="highlight highlight-source-java"><pre>dm<span class="pl-k">.</span>when(() <span class="pl-k">-</span><span class="pl-k">></span> {
<span class="pl-k">return</span> <span class="pl-s"><span class="pl-pds">"</span>Hey!<span class="pl-pds">"</span></span>;
})<span class="pl-k">.</span>done(r <span class="pl-k">-</span><span class="pl-k">></span> <span class="pl-smi">System</span><span class="pl-k">.</span>out<span class="pl-k">.</span>println(r));
dm<span class="pl-k">.</span>when(
() <span class="pl-k">-</span><span class="pl-k">></span> { <span class="pl-k">return</span> <span class="pl-s"><span class="pl-pds">"</span>Hello<span class="pl-pds">"</span></span>; },
() <span class="pl-k">-</span><span class="pl-k">></span> { <span class="pl-k">return</span> <span class="pl-s"><span class="pl-pds">"</span>World<span class="pl-pds">"</span></span>; }
)<span class="pl-k">.</span>done(rs <span class="pl-k">-</span><span class="pl-k">></span>
rs<span class="pl-k">.</span>forEach(r <span class="pl-k">-</span><span class="pl-k">></span> <span class="pl-smi">System</span><span class="pl-k">.</span>out<span class="pl-k">.</span>println(r<span class="pl-k">.</span>getResult()))
);</pre></div>
<h2>
<a id="groovy" class="anchor" href="#groovy" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a><a name="example-groovy"></a>Groovy</h2>
<p>You can also easily use with Groovy!</p>
<div class="highlight highlight-source-groovy"><pre><span class="pl-k">@Grab</span>(<span class="pl-s"><span class="pl-pds">'</span>org.jdeferred:jdeferred-core:1.2.4<span class="pl-pds">'</span></span>)
<span class="pl-k">import</span> <span class="pl-smi">org.jdeferred.*</span>
<span class="pl-k">import</span> <span class="pl-smi">org.jdeferred.impl.*</span>
<span class="pl-k">def</span> deferred <span class="pl-k">=</span> <span class="pl-k">new</span> <span class="pl-k">DeferredObject</span>()
<span class="pl-k">def</span> promise <span class="pl-k">=</span> deferred<span class="pl-k">.</span>promise()
promise<span class="pl-k">.</span>done { <span class="pl-v">result</span> <span class="pl-k">-></span>
<span class="pl-c1">println</span> <span class="pl-s"><span class="pl-pds">"</span>done: <span class="pl-smi">$r<span class="pl-smi">esult</span></span><span class="pl-pds">"</span></span>
}<span class="pl-k">.</span><span class="pl-c1">fail</span> { <span class="pl-v">rejection</span> <span class="pl-k">-></span>
<span class="pl-c1">println</span> <span class="pl-s"><span class="pl-pds">"</span>fail: <span class="pl-smi">$r<span class="pl-smi">ejection</span></span><span class="pl-pds">"</span></span>
}<span class="pl-k">.</span>always { <span class="pl-v">state</span>, <span class="pl-v">result</span>, <span class="pl-v">rejection</span> <span class="pl-k">-></span>
<span class="pl-c1">println</span> <span class="pl-s"><span class="pl-pds">"</span>always<span class="pl-pds">"</span></span>
}
deferred<span class="pl-k">.</span>resolve(<span class="pl-s"><span class="pl-pds">"</span>done<span class="pl-pds">"</span></span>)</pre></div>
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