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-<div class="subTitle">org.apache.samza.system.chooser</div>
-<h2 title="Class BaseMessageChooser" class="title">Class 
BaseMessageChooser</h2>
-</div>
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-<ul class="inheritance">
-<li>java.lang.Object</li>
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-<dd><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html" 
title="interface in org.apache.samza.system.chooser">MessageChooser</a></dd>
-</dl>
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-<pre>public abstract class <span class="strong">BaseMessageChooser</span>
-extends java.lang.Object
-implements <a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html" 
title="interface in org.apache.samza.system.chooser">MessageChooser</a></pre>
-<div class="block">An abstract MessageChooser that implements 
start/stop/register for choosers
- that don't use them.</div>
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-<td class="colFirst"><code>void</code></td>
-<td class="colLast"><code><strong><a 
href="../../../../../org/apache/samza/system/chooser/BaseMessageChooser.html#register(org.apache.samza.system.SystemStreamPartition,%20java.lang.String)">register</a></strong>(<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">Called before start, to let the chooser know that it will 
be handling
- envelopes from the given SystemStreamPartition.</div>
-</td>
-</tr>
-<tr class="rowColor">
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-<td class="colLast"><code><strong><a 
href="../../../../../org/apache/samza/system/chooser/BaseMessageChooser.html#start()">start</a></strong>()</code>
-<div class="block">Called after all SystemStreamPartitions have been 
registered.</div>
-</td>
-</tr>
-<tr class="altColor">
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-<td class="colLast"><code><strong><a 
href="../../../../../org/apache/samza/system/chooser/BaseMessageChooser.html#stop()">stop</a></strong>()</code>
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href="../../../../../org/apache/samza/system/chooser/MessageChooser.html" 
title="interface in org.apache.samza.system.chooser">MessageChooser</a></h3>
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href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#choose()">choose</a>,
 <a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#update(org.apache.samza.system.IncomingMessageEnvelope)">update</a></code></li>
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-<pre>public&nbsp;void&nbsp;start()</pre>
-<div class="block"><strong>Description copied from interface:&nbsp;<code><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#start()">MessageChooser</a></code></strong></div>
-<div class="block">Called after all SystemStreamPartitions have been 
registered. Start is used
- to notify the chooser that it will start receiving update and choose 
calls.</div>
-<dl>
-<dt><strong>Specified by:</strong></dt>
-<dd><code><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#start()">start</a></code>&nbsp;in
 interface&nbsp;<code><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html" 
title="interface in 
org.apache.samza.system.chooser">MessageChooser</a></code></dd>
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href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#stop()">MessageChooser</a></code></strong></div>
-<div class="block">Called when the chooser is about to be discarded. No more 
messages will be
- given to the chooser after it is stopped.</div>
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-<dt><strong>Specified by:</strong></dt>
-<dd><code><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#stop()">stop</a></code>&nbsp;in
 interface&nbsp;<code><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html" 
title="interface in 
org.apache.samza.system.chooser">MessageChooser</a></code></dd>
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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"><strong>Description copied from interface:&nbsp;<code><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#register(org.apache.samza.system.SystemStreamPartition,%20java.lang.String)">MessageChooser</a></code></strong></div>
-<div class="block">Called before start, to let the chooser know that it will 
be handling
- envelopes from the given SystemStreamPartition. Register will only be
- called before start.</div>
-<dl>
-<dt><strong>Specified by:</strong></dt>
-<dd><code><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#register(org.apache.samza.system.SystemStreamPartition,%20java.lang.String)">register</a></code>&nbsp;in
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href="../../../../../org/apache/samza/system/chooser/MessageChooser.html" 
title="interface in 
org.apache.samza.system.chooser">MessageChooser</a></code></dd>
-<dt><span 
class="strong">Parameters:</span></dt><dd><code>systemStreamPartition</code> - 
A SystemStreamPartition that envelopes will be coming 
from.</dd><dd><code>offset</code> - The offset of the first message expected 
for the
-          system/stream/partition that's being registered. If "7" were
-          supplied as the offset, then the MessageChooser can expect the
-          first message it is updated with for the system/stream/partition
-          will have an offset of "7".</dd></dl>
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http://git-wip-us.apache.org/repos/asf/incubator-samza/blob/b2ecfef4/docs/learn/documentation/versioned/api/javadocs/org/apache/samza/system/chooser/MessageChooser.html
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"http://www.w3.org/TR/html4/loose.dtd";>
-<!-- NewPage -->
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-<head>
-<!-- Generated by javadoc (version 1.7.0_65) on Tue Aug 05 21:46:34 PDT 2014 
-->
-<title>MessageChooser (samza-api 0.8.0-SNAPSHOT API)</title>
-<meta name="date" content="2014-08-05">
-<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" 
title="Style">
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-    if (location.href.indexOf('is-external=true') == -1) {
-        parent.document.title="MessageChooser (samza-api 0.8.0-SNAPSHOT API)";
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-<!-- ========= END OF TOP NAVBAR ========= -->
-<!-- ======== START OF CLASS DATA ======== -->
-<div class="header">
-<div class="subTitle">org.apache.samza.system.chooser</div>
-<h2 title="Interface MessageChooser" class="title">Interface 
MessageChooser</h2>
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-<div class="contentContainer">
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-<dt>All Known Implementing Classes:</dt>
-<dd><a 
href="../../../../../org/apache/samza/system/chooser/BaseMessageChooser.html" 
title="class in org.apache.samza.system.chooser">BaseMessageChooser</a></dd>
-</dl>
-<hr>
-<br>
-<pre>public interface <span class="strong">MessageChooser</span></pre>
-<div class="block">MessageChooser is an interface for programmatic fine-grain 
control over
- stream consumption.
-
- <p>Consider the case of a Samza task consuming multiple streams, where some
- streams may be from live systems that have stricter SLA requirements and must
- always be prioritized over other streams that may be from batch systems.
- MessageChooser allows developers to inject message prioritization logic into
- the SamzaContainer.
-
- <p>In general, the MessageChooser can be used to prioritize certain systems,
- streams or partitions over others. It can also be used to throttle certain
- partitions, by choosing not to return messages even though they are
- available. The MessageChooser can also throttle the entire SamzaContainer by
- performing a blocking operation, such as Thread.sleep.
-
- <p>The manner in which MessageChooser is used is:
-
- <ul>
- <li>SystemConsumers buffer messages from all SystemStreamPartitions as they
- become available.</li>
- <li>If MessageChooser has no messages for a given SystemStreamPartition, and
- a SystemConsumer has a message in its buffer for the SystemStreamPartition,
- the MessageChooser will be updated once with the next message in the 
buffer.</li>
- <li>When SamzaContainer is ready to process another message, it calls
- SystemConsumers.choose, which in turn calls <a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#choose()"><code>choose()</code></a>.</li>
- </ul>
-
- <p>Since the MessageChooser only receives one message at a time per
- <a href="../../../../../org/apache/samza/system/SystemStreamPartition.html" 
title="class in 
org.apache.samza.system"><code>SystemStreamPartition</code></a>, it can be used 
to order messages between different
- SystemStreamPartitions, but it can't be used to re-order messages within a
- single SystemStreamPartition (a buffered sort). This must be done within a
- StreamTask.
-
- <p>The contract between the MessageChooser and the SystemConsumers is:
-
- <ul>
- <li><a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#update(org.apache.samza.system.IncomingMessageEnvelope)"><code>update(IncomingMessageEnvelope)</code></a>
 can be called multiple times
- before <a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#choose()"><code>choose()</code></a>
 is called.</li>
- <li>If <a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#choose()"><code>choose()</code></a>
 returns null, that means no envelopes should be
- processed at the moment.</li>
- <li>A MessageChooser may elect to return null when <a 
href="../../../../../org/apache/samza/system/chooser/MessageChooser.html#choose()"><code>choose()</code></a>
 is
- called, even if unprocessed messages have been given by the update 
method.</li>
- <li>A MessageChooser will not have any of its in-memory state restored in the
- event of a failure.</li>
- <li>Blocking operations (such as Thread.sleep) will block all processing in
- the entire SamzaContainer.</li>
- <li>A MessageChooser should never return the same envelope more than 
once.</li>
- <li>Non-deterministic (e.g. time-based) MessageChoosers are allowed.</li>
- <li>A MessageChooser does not need to be thread-safe.</li>
- </ul></div>
-</li>
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title="class in 
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title="class in 
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title="class in 
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be handling
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class="strong">Parameters:</span></dt><dd><code>systemStreamPartition</code> - 
A SystemStreamPartition that envelopes will be coming 
from.</dd><dd><code>offset</code> - The offset of the first message expected 
for the
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-<div class="header">
-<div class="subTitle">org.apache.samza.system.chooser</div>
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title="interface in 
org.apache.samza.system.chooser"><code>MessageChooser</code></a></div>
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title="interface in 
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org.apache.samza.config">Config</a>&nbsp;config,
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org.apache.samza.config">Config</a>&nbsp;config,
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