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<div class="subTitle">org.apache.twill.api</div>
<h2 title="Interface TwillContext" class="title">Interface TwillContext</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html" title="interface in org.apache.twill.discovery">DiscoveryServiceClient</a>, <a href="../../../../org/apache/twill/api/ServiceAnnouncer.html" title="interface in org.apache.twill.api">ServiceAnnouncer</a></dd>
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<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../../../org/apache/twill/internal/BasicTwillContext.html" title="class in org.apache.twill.internal">BasicTwillContext</a></dd>
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<pre>public interface <span class="typeNameLabel">TwillContext</span>
extends <a href="../../../../org/apache/twill/api/ServiceAnnouncer.html" title="interface in org.apache.twill.api">ServiceAnnouncer</a>, <a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html" title="interface in org.apache.twill.discovery">DiscoveryServiceClient</a></pre>
<div class="block">Represents the runtime context of a <a href="../../../../org/apache/twill/api/TwillRunnable.html" title="interface in org.apache.twill.api"><code>TwillRunnable</code></a>.</div>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks">Lock</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#createLock-java.lang.String-">createLock</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
<div class="block">Creates a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks"><code>Lock</code></a> for performing locking mechanism within the same <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.</div>
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</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/twill/discovery/ServiceDiscovered.html" title="interface in org.apache.twill.discovery">ServiceDiscovered</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#discover-java.lang.String-">discover</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
<div class="block">Discover service with the given name that is announced within the same <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#electLeader-java.lang.String-org.apache.twill.api.ElectionHandler-">electLeader</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
<a href="../../../../org/apache/twill/api/ElectionHandler.html" title="interface in org.apache.twill.api">ElectionHandler</a>&nbsp;participantHandler)</code>
<div class="block">Register to participate in a leader election by instances within the same <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getApplicationArguments--">getApplicationArguments</a></span>()</code>
<div class="block">Returns the runtime arguments that are passed to the <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.</div>
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<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api">RunId</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getApplicationRunId--">getApplicationRunId</a></span>()</code>
<div class="block">Returns the <a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api"><code>RunId</code></a> of this running application.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getArguments--">getArguments</a></span>()</code>
<div class="block">Returns the runtime arguments that are passed to the <a href="../../../../org/apache/twill/api/TwillRunnable.html" title="interface in org.apache.twill.api"><code>TwillRunnable</code></a>.</div>
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</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getHost--">getHost</a></span>()</code>
<div class="block">Returns the hostname that the runnable is running on.</div>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getInstanceCount--">getInstanceCount</a></span>()</code>
<div class="block">Returns the number of running instances assigned for this <a href="../../../../org/apache/twill/api/TwillRunnable.html" title="interface in org.apache.twill.api"><code>TwillRunnable</code></a>.</div>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getInstanceId--">getInstanceId</a></span>()</code>
<div class="block">Returns an integer id from 0 to (instanceCount - 1).</div>
</td>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getMaxMemoryMB--">getMaxMemoryMB</a></span>()</code>
<div class="block">Returns the amount of memory in MB the runnable is allowed to use.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api">RunId</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getRunId--">getRunId</a></span>()</code>
<div class="block">Returns the <a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api"><code>RunId</code></a> of this running instance of <a href="../../../../org/apache/twill/api/TwillRunnable.html" title="interface in org.apache.twill.api"><code>TwillRunnable</code></a>.</div>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/twill/api/TwillRunnableSpecification.html" title="interface in org.apache.twill.api">TwillRunnableSpecification</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getSpecification--">getSpecification</a></span>()</code>
<div class="block">Returns the <a href="../../../../org/apache/twill/api/TwillRunnableSpecification.html" title="interface in org.apache.twill.api"><code>TwillRunnableSpecification</code></a> that was created by <a href="../../../../org/apache/twill/api/TwillRunnable.html#configure--"><code>TwillRunnable.configure()</code></a>.</div>
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<tr id="i12" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/twill/api/TwillContext.html#getVirtualCores--">getVirtualCores</a></span>()</code>
<div class="block">Returns the number of virtual cores the runnable is allowed to use.</div>
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<h3>Methods inherited from interface&nbsp;org.apache.twill.api.<a href="../../../../org/apache/twill/api/ServiceAnnouncer.html" title="interface in org.apache.twill.api">ServiceAnnouncer</a></h3>
<code><a href="../../../../org/apache/twill/api/ServiceAnnouncer.html#announce-java.lang.String-int-">announce</a>, <a href="../../../../org/apache/twill/api/ServiceAnnouncer.html#announce-java.lang.String-int-byte:A-">announce</a></code></li>
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<h3>Method Detail</h3>
<a name="getRunId--">
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<h4>getRunId</h4>
<pre><a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api">RunId</a>&nbsp;getRunId()</pre>
<div class="block">Returns the <a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api"><code>RunId</code></a> of this running instance of <a href="../../../../org/apache/twill/api/TwillRunnable.html" title="interface in org.apache.twill.api"><code>TwillRunnable</code></a>.</div>
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<h4>getApplicationRunId</h4>
<pre><a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api">RunId</a>&nbsp;getApplicationRunId()</pre>
<div class="block">Returns the <a href="../../../../org/apache/twill/api/RunId.html" title="interface in org.apache.twill.api"><code>RunId</code></a> of this running application.</div>
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<pre>int&nbsp;getInstanceCount()</pre>
<div class="block">Returns the number of running instances assigned for this <a href="../../../../org/apache/twill/api/TwillRunnable.html" title="interface in org.apache.twill.api"><code>TwillRunnable</code></a>.</div>
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<h4>getHost</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a>&nbsp;getHost()</pre>
<div class="block">Returns the hostname that the runnable is running on.</div>
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<h4>getArguments</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]&nbsp;getArguments()</pre>
<div class="block">Returns the runtime arguments that are passed to the <a href="../../../../org/apache/twill/api/TwillRunnable.html" title="interface in org.apache.twill.api"><code>TwillRunnable</code></a>.</div>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[]&nbsp;getApplicationArguments()</pre>
<div class="block">Returns the runtime arguments that are passed to the <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.</div>
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<h4>getSpecification</h4>
<pre><a href="../../../../org/apache/twill/api/TwillRunnableSpecification.html" title="interface in org.apache.twill.api">TwillRunnableSpecification</a>&nbsp;getSpecification()</pre>
<div class="block">Returns the <a href="../../../../org/apache/twill/api/TwillRunnableSpecification.html" title="interface in org.apache.twill.api"><code>TwillRunnableSpecification</code></a> that was created by <a href="../../../../org/apache/twill/api/TwillRunnable.html#configure--"><code>TwillRunnable.configure()</code></a>.</div>
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<pre>int&nbsp;getInstanceId()</pre>
<div class="block">Returns an integer id from 0 to (instanceCount - 1).</div>
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<h4>getVirtualCores</h4>
<pre>int&nbsp;getVirtualCores()</pre>
<div class="block">Returns the number of virtual cores the runnable is allowed to use.</div>
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<pre>int&nbsp;getMaxMemoryMB()</pre>
<div class="block">Returns the amount of memory in MB the runnable is allowed to use.</div>
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<a name="discover-java.lang.String-">
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<h4>discover</h4>
<pre><a href="../../../../org/apache/twill/discovery/ServiceDiscovered.html" title="interface in org.apache.twill.discovery">ServiceDiscovered</a>&nbsp;discover(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</pre>
<div class="block">Discover service with the given name that is announced within the same <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html#discover-java.lang.String-">discover</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/twill/discovery/DiscoveryServiceClient.html" title="interface in org.apache.twill.discovery">DiscoveryServiceClient</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - Name of the service</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <a href="../../../../org/apache/twill/discovery/ServiceDiscovered.html" title="interface in org.apache.twill.discovery"><code>ServiceDiscovered</code></a> object representing the result.</dd>
</dl>
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<a name="electLeader-java.lang.String-org.apache.twill.api.ElectionHandler-">
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<h4>electLeader</h4>
<pre><a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common">Cancellable</a>&nbsp;electLeader(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name,
<a href="../../../../org/apache/twill/api/ElectionHandler.html" title="interface in org.apache.twill.api">ElectionHandler</a>&nbsp;participantHandler)</pre>
<div class="block">Register to participate in a leader election by instances within the same <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - Unique name for the election</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <a href="../../../../org/apache/twill/common/Cancellable.html" title="interface in org.apache.twill.common"><code>Cancellable</code></a> object representing this candidate's participation.</dd>
</dl>
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<a name="createLock-java.lang.String-">
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<h4>createLock</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks">Lock</a>&nbsp;createLock(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</pre>
<div class="block">Creates a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks"><code>Lock</code></a> for performing locking mechanism within the same <a href="../../../../org/apache/twill/api/TwillApplication.html" title="interface in org.apache.twill.api"><code>TwillApplication</code></a>.
The lock created is a reentrant such that if the lock is owned by the current thread, it will return immediately.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - Unique name for the lock</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html?is-external=true" title="class or interface in java.util.concurrent.locks"><code>Lock</code></a> object</dd>
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