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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Babl Low-Latency WebSocket Server - Application</title>
<link rel="stylesheet" type="text/css" href="assets/style/style.css">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Babl Low Latency Java Websocket Server is a high performance solution for real-time web messaging.">
<meta name="keywords" content="Java Websocket web-socket low-latency high-performance garbage-free allocation-free real-time messaging scalable server"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
</head>
<body>
<div class="nav" role="navigation">
<div class="nav-top">
<ul>
<li class="logo" role="logo">
<h3>
<p>BABL</p>
</h3>
</li>
<li>
<a href="https://hub.docker.com/r/aitusoftware/babl" target="_" role="link">
<svg viewBox="0 0 60 60" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" class="docker">
<title>Docker Logo</title>
<desc>Docker Link</desc>
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</linearGradient>
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<path d="M36.6816828,14.0007123 C34.5223014,18.6710524 29.1844403,26 17,26 C4.98681223,26 1.89812143,18.7391462 1.16159055,13.9999765 Z M13.914,19.597 C13.69,19.09 13.117,18.906 12.595,19.088 C10.161,19.934 6.036,20.054 3.451,20.054 C3.913,20.738 4.463,21.398 5.107,22.017 C7.258,22.017 10.103,21.888 13.404,20.915 C13.934,20.759 14.138,20.102 13.914,19.597 Z M17,16 C15.8954305,16 15,16.8954305 15,18 C15,19.1045695 15.8954305,20 17,20 C18.1045695,20 19,19.1045695 19,18 C19,16.8954305 18.1045695,16 17,16 Z M36.5,0 C38.908,2.22 39.391,4.265 39,6 C40.339,4.978 42.162,4.533 45,5.516 C43.93,9.829 41.147,10.983 39,11 C38.579,11.003 38.182,10.972 37.828,10.924 C37.6924745,11.4110991 37.4683827,12.1225663 37.1251065,12.9750343 C36.174843,12.766512 35.3893743,12.399283 35,12 C33.819,13.874 27.479,13.461 27,12 C25.625,13.75 20.25,13.438 19,12 C17.938,13.375 12.063,13.688 11,12 C9.94,13.088 5.875,13.688 4,12 C2.96486686,13.0351331 1.2947704,13.0119941 1.03455553,13.001692 C0.859446112,11.2268752 1,10 1,10 L1,10 L31,10 C34.834,10 35,9 35,9 C33.705,7.227 32.586,3.543 36.5,0 Z" id="Path-2"></path>
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</a>
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<li>
<a href="https://github.com/babl-ws/babl" target="_" role="link">
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<title>Github Logo</title>
<desc>Github Link</desc>
<g>
<path d="M21,80.387 C21,107.068 38.303,129.704 62.297,137.689 C65.315,138.248 66.423,136.379 66.423,134.784 C66.423,133.344 66.367,128.587 66.341,123.541 C49.541,127.194 45.996,116.416 45.996,116.416 C43.249,109.436 39.291,107.58 39.291,107.58 C33.812,103.832 39.704,103.909 39.704,103.909 C45.768,104.334 48.961,110.132 48.961,110.132 C54.347,119.364 63.088,116.695 66.534,115.152 C67.076,111.25 68.641,108.584 70.368,107.077 C56.955,105.55 42.855,100.372 42.855,77.233 C42.855,70.64 45.214,65.253 49.077,61.024 C48.45,59.502 46.383,53.361 49.662,45.043 C49.662,45.043 54.733,43.42 66.273,51.233 C71.09,49.895 76.256,49.224 81.388,49.201 C86.52,49.224 91.69,49.895 96.516,51.233 C108.042,43.42 113.106,45.043 113.106,45.043 C116.393,53.361 114.325,59.502 113.698,61.024 C117.57,65.253 119.913,70.64 119.913,77.233 C119.913,100.427 105.786,105.534 92.339,107.029 C94.505,108.903 96.435,112.578 96.435,118.212 C96.435,126.291 96.365,132.794 96.365,134.784 C96.365,136.391 97.452,138.274 100.513,137.681 C124.494,129.687 141.775,107.059 141.775,80.387 C141.775,47.035 114.738,20 81.388,20 C48.041,20 21,47.035 21,80.387 Z" id="Fill-52"></path>
<path d="M43.872,106.703 C43.739,107.004 43.267,107.093 42.837,106.887 C42.399,106.69 42.153,106.281 42.295,105.98 C42.425,105.671 42.898,105.586 43.335,105.791 C43.774,105.989 44.024,106.402 43.872,106.703" id="Fill-53"></path>
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<path d="M51.961,116.269 C51.63,116.634 50.925,116.536 50.409,116.038 C49.881,115.551 49.734,114.86 50.066,114.495 C50.401,114.129 51.11,114.232 51.63,114.726 C52.154,115.212 52.314,115.908 51.961,116.269" id="Fill-56"></path>
<path d="M56.461,118.22 C56.315,118.693 55.636,118.908 54.952,118.707 C54.269,118.5 53.822,117.946 53.96,117.468 C54.102,116.992 54.784,116.768 55.473,116.983 C56.155,117.189 56.603,117.739 56.461,118.22" id="Fill-57"></path>
<path d="M61.403,118.582 C61.42,119.08 60.84,119.493 60.122,119.501 C59.4,119.518 58.816,119.115 58.808,118.625 C58.808,118.122 59.375,117.713 60.097,117.701 C60.815,117.687 61.403,118.087 61.403,118.582" id="Fill-58"></path>
<path d="M66.002,117.799 C66.088,118.285 65.589,118.784 64.876,118.916 C64.175,119.045 63.526,118.745 63.437,118.263 C63.35,117.765 63.858,117.266 64.558,117.137 C65.272,117.013 65.911,117.305 66.002,117.799" id="Fill-59"></path>
</g>
</svg>
</a>
</li>
</ul>
</div>
<div class="burger">
<div></div>
</div>
<div class="nav-side">
<ul>
<li><a href="index.html">Home</a></li>
<li><a href="getting_started.html">Getting Started</a></li>
<li><a href="application.html">Application</a></li>
<li><a href="broadcast.html">Broadcast</a></li>
<li><a href="multi_topic_broadcast.html">Multi-Topic Broadcast</a></li>
<li><a href="architecture.html">Architecture</a></li>
<li><a href="session_lifecycle.html">Session Lifecycle</a></li>
<li><a href="monitoring.html">Monitoring</a></li>
<li><a href="configuration.html">Configuration</a></li>
<li><a href="performance_tuning.html">Performance</a></li>
<li><a href="open_source.html">Open Source</a></li>
<li><a href="pro_features.html">Pro Features</a></li>
<li><a href="support.html">Support</a></li>
</ul>
</div>
</div>
<div class="container" role="main">
<div class="content-heading">
<h3>Application</h3>
</div>
<div class="content-body">
<p>
At the heart of <strong>Babl</strong> server is your Application where your business logic is executed.<br/><br/>
Your application is executed on a single thread, and will be invoked when:
</p>
<ul class="list list-primary">
<li>A new web-socket session is established</li>
<li>A message is received from an established session</li>
<li>A web-socket session is disconnected</li>
</ul>
<p>
When running in <code>DIRECT</code> mode, your application is invoked on the thread that
processes network I/O and handles web-socket protocol framing.<br/><br/>
When running in <code>DETACHED</code> mode, your application is invoked on its own thread.<br/><br/>
For more detail on the two different modes, see <a href="architecture.html">Architecture</a>.
</p>
<h4 class="heading heading-primary">The Application Interface</h4>
<p>
Your business logic component must implement the <code>Application</code> interface, shown below.
</p>
<pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(240, 240, 240) none repeat scroll 0% 0%; color: rgb(68, 68, 68);"><span class="hljs-keyword" style="font-weight: 700;">package</span> com.aitusoftware.babl.user;
<span class="hljs-keyword" style="font-weight: 700;">import</span> com.aitusoftware.babl.websocket.DisconnectReason;
<span class="hljs-keyword" style="font-weight: 700;">import</span> com.aitusoftware.babl.websocket.Session;
<span class="hljs-keyword" style="font-weight: 700;">import</span> org.agrona.DirectBuffer;
<span class="hljs-keyword" style="font-weight: 700;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: 700;">interface</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">Application</span>
</span>{
<span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">int</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">onSessionConnected</span><span class="hljs-params">(
Session session)</span></span>;
<span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">int</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">onSessionDisconnected</span><span class="hljs-params">(
Session session,
DisconnectReason reason)</span></span>;
<span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">int</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">onSessionMessage</span><span class="hljs-params">(
Session session,
ContentType contentType,
DirectBuffer msg,
<span class="hljs-keyword" style="font-weight: 700;">int</span> offset,
<span class="hljs-keyword" style="font-weight: 700;">int</span> length)</span></span>;
}
</pre>
<p>
Applications <strong>may</strong> maintain a reference to a <code>Session</code> object
between connected and disconnected events.<br/><br/>
Applications <strong>must not</strong> invoke any method on a <code>Session</code> object
from a thread other than the application thread.
</p>
<h5>The Echo Application</h5>
<p>
The simplest example application is to simply to echo back messages to the client connection.<br/><br/>
This application is deployed in the example container described in <a href="index.html">Getting Started</a>.
</p>
<pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(240, 240, 240) none repeat scroll 0% 0%; color: rgb(68, 68, 68);"><span class="hljs-keyword" style="font-weight: 700;">public</span> <span class="hljs-keyword" style="font-weight: 700;">final</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: 700;">class</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">EchoApplication</span> <span class="hljs-keyword" style="font-weight: 700;">implements</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">Application</span>
</span>{
<span class="hljs-keyword" style="font-weight: 700;">private</span> <span class="hljs-keyword" style="font-weight: 700;">final</span> MutableDirectBuffer buffer =
<span class="hljs-keyword" style="font-weight: 700;">new</span> ExpandableDirectByteBuffer(<span class="hljs-number" style="color: rgb(136, 0, 0);">512</span>);
<span class="hljs-meta" style="color: rgb(31, 113, 153);">@Override</span>
<span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">public</span> <span class="hljs-keyword" style="font-weight: 700;">int</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">onSessionConnected</span><span class="hljs-params">(
<span class="hljs-keyword" style="font-weight: 700;">final</span> Session session)</span>
</span>{
System.out.printf(<span class="hljs-string" style="color: rgb(136, 0, 0);">"Session %d connected%n"</span>, session.id());
<span class="hljs-keyword" style="font-weight: 700;">return</span> SendResult.OK;
}
<span class="hljs-meta" style="color: rgb(31, 113, 153);">@Override</span>
<span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">public</span> <span class="hljs-keyword" style="font-weight: 700;">int</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">onSessionDisconnected</span><span class="hljs-params">(
<span class="hljs-keyword" style="font-weight: 700;">final</span> Session session,
<span class="hljs-keyword" style="font-weight: 700;">final</span> DisconnectReason reason)</span>
</span>{
System.out.printf(<span class="hljs-string" style="color: rgb(136, 0, 0);">"Session %d disconnected due to %s%n"</span>,
session.id(), reason.name());
<span class="hljs-keyword" style="font-weight: 700;">return</span> SendResult.OK;
}
<span class="hljs-meta" style="color: rgb(31, 113, 153);">@Override</span>
<span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">public</span> <span class="hljs-keyword" style="font-weight: 700;">int</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">onSessionMessage</span><span class="hljs-params">(
<span class="hljs-keyword" style="font-weight: 700;">final</span> Session session,
<span class="hljs-keyword" style="font-weight: 700;">final</span> ContentType contentType,
<span class="hljs-keyword" style="font-weight: 700;">final</span> DirectBuffer msg,
<span class="hljs-keyword" style="font-weight: 700;">final</span> <span class="hljs-keyword" style="font-weight: 700;">int</span> offset,
<span class="hljs-keyword" style="font-weight: 700;">final</span> <span class="hljs-keyword" style="font-weight: 700;">int</span> length)</span>
</span>{
<span class="hljs-comment" style="color: rgb(136, 136, 136);">// copy request data to outbound buffer</span>
buffer.putBytes(<span class="hljs-number" style="color: rgb(136, 0, 0);">0</span>, msg, offset, length);
<span class="hljs-keyword" style="font-weight: 700;">int</span> sendResult;
do
{
<span class="hljs-comment" style="color: rgb(136, 136, 136);">// send buffer to session</span>
sendResult = session.send(contentType, buffer, <span class="hljs-number" style="color: rgb(136, 0, 0);">0</span>, length);
}
<span class="hljs-keyword" style="font-weight: 700;">while</span> (sendResult != SendResult.OK);
<span class="hljs-keyword" style="font-weight: 700;">return</span> sendResult;
}
}
</pre>
<h4 class="heading heading-primary">Application Work</h4>
<p>
When it is necessary to perform extra work on the application thread
(e.g. polling an external message transport), this can be configured by
supplying an extra <code>Agent</code> to the application configuration:
</p>
<pre class="hljs" style="display: block; overflow-x: auto; padding: 0.5em; background: rgb(240, 240, 240) none repeat scroll 0% 0%; color: rgb(68, 68, 68);"><span class="hljs-function"><span class="hljs-keyword" style="font-weight: 700;">private</span> <span class="hljs-keyword" style="font-weight: 700;">void</span> <span class="hljs-title" style="color: rgb(136, 0, 0); font-weight: 700;">configureApplication</span><span class="hljs-params">(<span class="hljs-keyword" style="font-weight: 700;">final</span> BablConfig bablConfig)</span>
</span>{
<span class="hljs-keyword" style="font-weight: 700;">final</span> Agent pollingAgent = createPollingAgent();
bablConfig.applicationConfig().additionalWork(pollingAgent);
}
</pre>
<p>
The additional <code>Agent</code> will be invoked on each duty-cycle, after the
application.
</p>
</div>
</div>
<div class="copyright">
Copyright 2020 <a href="https://aitusoftware.com">Aitu Software Limited</a>
</div>
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