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Posted to commits@samza.apache.org by xi...@apache.org on 2016/10/19 17:21:45 UTC

svn commit: r1765686 [20/42] - in /samza/site: ./ archive/ community/ contribute/ img/0.11/ img/0.11/learn/ img/0.11/learn/documentation/ img/0.11/learn/documentation/comparisons/ img/0.11/learn/documentation/container/ img/0.11/learn/documentation/int...

Added: samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/task/package-tree.html
URL: http://svn.apache.org/viewvc/samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/task/package-tree.html?rev=1765686&view=auto
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--- samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/task/package-tree.html (added)
+++ samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/task/package-tree.html Wed Oct 19 17:21:41 2016
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Added: samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/util/BlockingEnvelopeMap.BlockingEnvelopeMapMetrics.html
URL: http://svn.apache.org/viewvc/samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/util/BlockingEnvelopeMap.BlockingEnvelopeMapMetrics.html?rev=1765686&view=auto
==============================================================================
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Added: samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/util/BlockingEnvelopeMap.BufferSizeGauge.html
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+<div class="header">
+<div class="subTitle">org.apache.samza.util</div>
+<h2 title="Class BlockingEnvelopeMap.BufferSizeGauge" class="title">Class BlockingEnvelopeMap.BufferSizeGauge</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
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+<ul class="inheritance">
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+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.BufferSizeGauge.html#BufferSizeGauge-org.apache.samza.system.SystemStreamPartition-java.lang.String-">BufferSizeGauge</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
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+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>java.lang.Long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.BufferSizeGauge.html#getValue--">getValue</a></span>()</code>&nbsp;</td>
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Added: samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/util/BlockingEnvelopeMap.html
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+++ samza/site/learn/documentation/0.11/api/javadocs/org/apache/samza/util/BlockingEnvelopeMap.html Wed Oct 19 17:21:41 2016
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+<ul class="subNavList">
+<li>Summary:&nbsp;</li>
+<li><a href="#nested.class.summary">Nested</a>&nbsp;|&nbsp;</li>
+<li><a href="#field.summary">Field</a>&nbsp;|&nbsp;</li>
+<li><a href="#constructor.summary">Constr</a>&nbsp;|&nbsp;</li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.samza.util</div>
+<h2 title="Class BlockingEnvelopeMap" class="title">Class BlockingEnvelopeMap</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.samza.util.BlockingEnvelopeMap</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Implemented Interfaces:</dt>
+<dd><a href="../../../../org/apache/samza/system/SystemConsumer.html" title="interface in org.apache.samza.system">SystemConsumer</a></dd>
+</dl>
+<hr>
+<br>
+<pre>public abstract class <span class="typeNameLabel">BlockingEnvelopeMap</span>
+extends java.lang.Object
+implements <a href="../../../../org/apache/samza/system/SystemConsumer.html" title="interface in org.apache.samza.system">SystemConsumer</a></pre>
+<div class="block"><p>
+ BlockingEnvelopeMap is a helper class for SystemConsumer implementations.
+ Samza's poll() requirements make implementing SystemConsumers somewhat
+ tricky. BlockingEnvelopeMap is provided to help other developers write
+ SystemConsumers. The intended audience is not those writing Samza jobs, but
+ rather those extending Samza to consume from new types of stream providers
+ and other systems.
+ </p>
+ 
+ <p>
+ SystemConsumers that implement BlockingEnvelopeMap need to add messages using
+ <a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#put-org.apache.samza.system.SystemStreamPartition-org.apache.samza.system.IncomingMessageEnvelope-"><code>put</code></a>
+ (or <a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#putAll-org.apache.samza.system.SystemStreamPartition-java.util.List-"><code>putAll</code></a>),
+ and update noMoreMessage using setIsAtHead. The noMoreMessage variable is used
+ to determine whether a SystemStreamPartition is "caught up" (has read all
+ possible messages from the underlying system). For example, with a Kafka
+ system, noMoreMessages would be set to true when the last message offset
+ returned is equal to the offset high watermark for a given topic/partition.
+ </p>
+ The BlockingEnvelopeMap is backed by a concurrent map, which allows concurrent
+ put or putAll calls to be thread safe without external synchronization.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
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+<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Class and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>class&nbsp;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.BlockingEnvelopeMapMetrics.html" title="class in org.apache.samza.util">BlockingEnvelopeMap.BlockingEnvelopeMapMetrics</a></span></code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colFirst"><code>class&nbsp;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.BufferGauge.html" title="class in org.apache.samza.util">BlockingEnvelopeMap.BufferGauge</a></span></code>&nbsp;</td>
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+<tr class="altColor">
+<td class="colFirst"><code>class&nbsp;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.BufferSizeGauge.html" title="class in org.apache.samza.util">BlockingEnvelopeMap.BufferSizeGauge</a></span></code>&nbsp;</td>
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+</ul>
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+<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Field and Description</th>
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+<tr class="altColor">
+<td class="colFirst"><code>protected boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#fetchLimitByBytesEnabled">fetchLimitByBytesEnabled</a></span></code>&nbsp;</td>
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+<h3>Fields inherited from interface&nbsp;org.apache.samza.system.<a href="../../../../org/apache/samza/system/SystemConsumer.html" title="interface in org.apache.samza.system">SystemConsumer</a></h3>
+<code><a href="../../../../org/apache/samza/system/SystemConsumer.html#BLOCK_ON_OUTSTANDING_MESSAGES">BLOCK_ON_OUTSTANDING_MESSAGES</a></code></li>
+</ul>
+</li>
+</ul>
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+<h3>Constructor Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
+<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#BlockingEnvelopeMap--">BlockingEnvelopeMap</a></span>()</code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#BlockingEnvelopeMap-org.apache.samza.metrics.MetricsRegistry-">BlockingEnvelopeMap</a></span>(<a href="../../../../org/apache/samza/metrics/MetricsRegistry.html" title="interface in org.apache.samza.metrics">MetricsRegistry</a>&nbsp;metricsRegistry)</code>&nbsp;</td>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#BlockingEnvelopeMap-org.apache.samza.metrics.MetricsRegistry-org.apache.samza.util.Clock-">BlockingEnvelopeMap</a></span>(<a href="../../../../org/apache/samza/metrics/MetricsRegistry.html" title="interface in org.apache.samza.metrics">MetricsRegistry</a>&nbsp;metricsRegistry,
+                   <a href="../../../../org/apache/samza/util/Clock.html" title="interface in org.apache.samza.util">Clock</a>&nbsp;clock)</code>&nbsp;</td>
+</tr>
+<tr class="rowColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#BlockingEnvelopeMap-org.apache.samza.metrics.MetricsRegistry-org.apache.samza.util.Clock-java.lang.String-boolean-">BlockingEnvelopeMap</a></span>(<a href="../../../../org/apache/samza/metrics/MetricsRegistry.html" title="interface in org.apache.samza.metrics">MetricsRegistry</a>&nbsp;metricsRegistry,
+                   <a href="../../../../org/apache/samza/util/Clock.html" title="interface in org.apache.samza.util">Clock</a>&nbsp;clock,
+                   java.lang.String&nbsp;metricsGroupName,
+                   boolean&nbsp;fetchLimitByBytesEnabled)</code>&nbsp;</td>
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+<!-- ========== METHOD SUMMARY =========== -->
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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="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>long</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#getMessagesSizeInQueue-org.apache.samza.system.SystemStreamPartition-">getMessagesSizeInQueue</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition)</code>&nbsp;</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#getNumMessagesInQueue-org.apache.samza.system.SystemStreamPartition-">getNumMessagesInQueue</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition)</code>&nbsp;</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code>protected boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#isAtHead-org.apache.samza.system.SystemStreamPartition-">isAtHead</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition)</code>&nbsp;</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>protected java.util.concurrent.BlockingQueue&lt;<a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#newBlockingQueue--">newBlockingQueue</a></span>()</code>&nbsp;</td>
+</tr>
+<tr id="i4" class="altColor">
+<td class="colFirst"><code>java.util.Map&lt;<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>,java.util.List&lt;<a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&gt;&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#poll-java.util.Set-long-">poll</a></span>(java.util.Set&lt;<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&gt;&nbsp;systemStreamPartitions,
+    long&nbsp;timeout)</code>
+<div class="block">Poll the SystemConsumer to get any available messages from the underlying
+ system.</div>
+</td>
+</tr>
+<tr id="i5" class="rowColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#put-org.apache.samza.system.SystemStreamPartition-org.apache.samza.system.IncomingMessageEnvelope-">put</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+   <a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&nbsp;envelope)</code>
+<div class="block">Place a new <a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system"><code>IncomingMessageEnvelope</code></a> on the
+ queue for the specified <a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system"><code>SystemStreamPartition</code></a>.</div>
+</td>
+</tr>
+<tr id="i6" class="altColor">
+<td class="colFirst"><code>protected void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#putAll-org.apache.samza.system.SystemStreamPartition-java.util.List-">putAll</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+      java.util.List&lt;<a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&gt;&nbsp;envelopes)</code>
+<div class="block">Place a collection of <a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system"><code>IncomingMessageEnvelope</code></a>
+ on the queue for the specified <a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system"><code>SystemStreamPartition</code></a>.</div>
+</td>
+</tr>
+<tr id="i7" class="rowColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#register-org.apache.samza.system.SystemStreamPartition-java.lang.String-">register</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+        java.lang.String&nbsp;offset)</code>
+<div class="block">Register a SystemStreamPartition to this SystemConsumer.</div>
+</td>
+</tr>
+<tr id="i8" class="altColor">
+<td class="colFirst"><code>protected java.lang.Boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/samza/util/BlockingEnvelopeMap.html#setIsAtHead-org.apache.samza.system.SystemStreamPartition-boolean-">setIsAtHead</a></span>(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+           boolean&nbsp;isAtHead)</code>&nbsp;</td>
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+</table>
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+<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
+<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
+</ul>
+<ul class="blockList">
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+<h3>Methods inherited from interface&nbsp;org.apache.samza.system.<a href="../../../../org/apache/samza/system/SystemConsumer.html" title="interface in org.apache.samza.system">SystemConsumer</a></h3>
+<code><a href="../../../../org/apache/samza/system/SystemConsumer.html#start--">start</a>, <a href="../../../../org/apache/samza/system/SystemConsumer.html#stop--">stop</a></code></li>
+</ul>
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+<h3>Field Detail</h3>
+<a name="fetchLimitByBytesEnabled">
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+<li class="blockList">
+<h4>fetchLimitByBytesEnabled</h4>
+<pre>protected final&nbsp;boolean fetchLimitByBytesEnabled</pre>
+</li>
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+</ul>
+<!-- ========= CONSTRUCTOR DETAIL ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor.detail">
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+</a>
+<h3>Constructor Detail</h3>
+<a name="BlockingEnvelopeMap--">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>BlockingEnvelopeMap</h4>
+<pre>public&nbsp;BlockingEnvelopeMap()</pre>
+</li>
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+<h4>BlockingEnvelopeMap</h4>
+<pre>public&nbsp;BlockingEnvelopeMap(<a href="../../../../org/apache/samza/metrics/MetricsRegistry.html" title="interface in org.apache.samza.metrics">MetricsRegistry</a>&nbsp;metricsRegistry)</pre>
+</li>
+</ul>
+<a name="BlockingEnvelopeMap-org.apache.samza.metrics.MetricsRegistry-org.apache.samza.util.Clock-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>BlockingEnvelopeMap</h4>
+<pre>public&nbsp;BlockingEnvelopeMap(<a href="../../../../org/apache/samza/metrics/MetricsRegistry.html" title="interface in org.apache.samza.metrics">MetricsRegistry</a>&nbsp;metricsRegistry,
+                           <a href="../../../../org/apache/samza/util/Clock.html" title="interface in org.apache.samza.util">Clock</a>&nbsp;clock)</pre>
+</li>
+</ul>
+<a name="BlockingEnvelopeMap-org.apache.samza.metrics.MetricsRegistry-org.apache.samza.util.Clock-java.lang.String-boolean-">
+<!--   -->
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+<ul class="blockListLast">
+<li class="blockList">
+<h4>BlockingEnvelopeMap</h4>
+<pre>public&nbsp;BlockingEnvelopeMap(<a href="../../../../org/apache/samza/metrics/MetricsRegistry.html" title="interface in org.apache.samza.metrics">MetricsRegistry</a>&nbsp;metricsRegistry,
+                           <a href="../../../../org/apache/samza/util/Clock.html" title="interface in org.apache.samza.util">Clock</a>&nbsp;clock,
+                           java.lang.String&nbsp;metricsGroupName,
+                           boolean&nbsp;fetchLimitByBytesEnabled)</pre>
+</li>
+</ul>
+</li>
+</ul>
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.detail">
+<!--   -->
+</a>
+<h3>Method Detail</h3>
+<a name="register-org.apache.samza.system.SystemStreamPartition-java.lang.String-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>register</h4>
+<pre>public&nbsp;void&nbsp;register(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+                     java.lang.String&nbsp;offset)</pre>
+<div class="block">Register a SystemStreamPartition to this SystemConsumer. The SystemConsumer
+ should try and read messages from all SystemStreamPartitions that are
+ registered to it. SystemStreamPartitions should only be registered before
+ start is called.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../org/apache/samza/system/SystemConsumer.html#register-org.apache.samza.system.SystemStreamPartition-java.lang.String-">register</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/samza/system/SystemConsumer.html" title="interface in org.apache.samza.system">SystemConsumer</a></code></dd>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>systemStreamPartition</code> - The SystemStreamPartition object representing the Samza
+          SystemStreamPartition to receive messages from.</dd>
+<dd><code>offset</code> - String representing the offset of the point in the stream to start
+          reading messages from. This is an inclusive parameter; if "7" were
+          specified, the first message for the system/stream/partition to be
+          consumed and returned would be a message whose offset is "7".</dd>
+</dl>
+</li>
+</ul>
+<a name="newBlockingQueue--">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>newBlockingQueue</h4>
+<pre>protected&nbsp;java.util.concurrent.BlockingQueue&lt;<a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&gt;&nbsp;newBlockingQueue()</pre>
+</li>
+</ul>
+<a name="poll-java.util.Set-long-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>poll</h4>
+<pre>public&nbsp;java.util.Map&lt;<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>,java.util.List&lt;<a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&gt;&gt;&nbsp;poll(java.util.Set&lt;<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&gt;&nbsp;systemStreamPartitions,
+                                                                                         long&nbsp;timeout)
+                                                                                  throws java.lang.InterruptedException</pre>
+<div class="block">Poll the SystemConsumer to get any available messages from the underlying
+ system.
+ 
+ <p>
+ If the underlying implementation does not take care to adhere to the
+ timeout parameter, the SamzaContainer's performance will suffer
+ drastically. Specifically, if poll blocks when it's not supposed to, it
+ will block the entire main thread in SamzaContainer, and no messages will
+ be processed while blocking is occurring.
+ </p></div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../org/apache/samza/system/SystemConsumer.html#poll-java.util.Set-long-">poll</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/samza/system/SystemConsumer.html" title="interface in org.apache.samza.system">SystemConsumer</a></code></dd>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>systemStreamPartitions</code> - A set of SystemStreamPartition to poll for new messages. If
+          SystemConsumer has messages available for other registered
+          SystemStreamPartitions, but they are not in the
+          systemStreamPartitions set in a given poll invocation, they can't
+          be returned. It is illegal to pass in SystemStreamPartitions that
+          have not been registered with the SystemConsumer first.</dd>
+<dd><code>timeout</code> - If timeout &lt; 0, poll will block unless all SystemStreamPartition
+          are at "head" (the underlying system has been checked, and
+          returned an empty set). If at head, an empty map is returned. If
+          timeout &gt;= 0, poll will return any messages that are currently
+          available for any of the SystemStreamPartitions specified. If no
+          new messages are available, it will wait up to timeout
+          milliseconds for messages from any SystemStreamPartition to become
+          available. It will return an empty map if the timeout is hit, and
+          no new messages are available.</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>A map from SystemStreamPartitions to any available
+         IncomingMessageEnvelopes for the SystemStreamPartitions. If no
+         messages are available for a SystemStreamPartition that was
+         supplied in the polling set, the map will not contain a key for the
+         SystemStreamPartition. Will return an empty map, not null, if no
+         new messages are available for any SystemStreamPartitions in the
+         input set.</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>java.lang.InterruptedException</code> - Thrown when a blocking poll has been interrupted by another
+          thread.</dd>
+</dl>
+</li>
+</ul>
+<a name="put-org.apache.samza.system.SystemStreamPartition-org.apache.samza.system.IncomingMessageEnvelope-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>put</h4>
+<pre>protected&nbsp;void&nbsp;put(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+                   <a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&nbsp;envelope)
+            throws java.lang.InterruptedException</pre>
+<div class="block">Place a new <a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system"><code>IncomingMessageEnvelope</code></a> on the
+ queue for the specified <a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system"><code>SystemStreamPartition</code></a>.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>systemStreamPartition</code> - SystemStreamPartition that owns the envelope</dd>
+<dd><code>envelope</code> - Message for specified SystemStreamPartition</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>java.lang.InterruptedException</code> - from underlying concurrent collection</dd>
+</dl>
+</li>
+</ul>
+<a name="putAll-org.apache.samza.system.SystemStreamPartition-java.util.List-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>putAll</h4>
+<pre>protected&nbsp;void&nbsp;putAll(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+                      java.util.List&lt;<a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system">IncomingMessageEnvelope</a>&gt;&nbsp;envelopes)
+               throws java.lang.InterruptedException</pre>
+<div class="block">Place a collection of <a href="../../../../org/apache/samza/system/IncomingMessageEnvelope.html" title="class in org.apache.samza.system"><code>IncomingMessageEnvelope</code></a>
+ on the queue for the specified <a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system"><code>SystemStreamPartition</code></a>.
+ <p>
+ Insertion of all the messages into the queue is not guaranteed to be done
+ atomically.
+ </p></div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>systemStreamPartition</code> - SystemStreamPartition that owns the envelope</dd>
+<dd><code>envelopes</code> - Messages for specified SystemStreamPartition</dd>
+<dt><span class="throwsLabel">Throws:</span></dt>
+<dd><code>java.lang.InterruptedException</code> - from underlying concurrent collection</dd>
+</dl>
+</li>
+</ul>
+<a name="getNumMessagesInQueue-org.apache.samza.system.SystemStreamPartition-">
+<!--   -->
+</a>
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+<h4>getNumMessagesInQueue</h4>
+<pre>public&nbsp;int&nbsp;getNumMessagesInQueue(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition)</pre>
+</li>
+</ul>
+<a name="getMessagesSizeInQueue-org.apache.samza.system.SystemStreamPartition-">
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+<h4>getMessagesSizeInQueue</h4>
+<pre>public&nbsp;long&nbsp;getMessagesSizeInQueue(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition)</pre>
+</li>
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+<a name="setIsAtHead-org.apache.samza.system.SystemStreamPartition-boolean-">
+<!--   -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>setIsAtHead</h4>
+<pre>protected&nbsp;java.lang.Boolean&nbsp;setIsAtHead(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition,
+                                        boolean&nbsp;isAtHead)</pre>
+</li>
+</ul>
+<a name="isAtHead-org.apache.samza.system.SystemStreamPartition-">
+<!--   -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>isAtHead</h4>
+<pre>protected&nbsp;boolean&nbsp;isAtHead(<a href="../../../../org/apache/samza/system/SystemStreamPartition.html" title="class in org.apache.samza.system">SystemStreamPartition</a>&nbsp;systemStreamPartition)</pre>
+</li>
+</ul>
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