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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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+<title>Streaming with BookKeeper</title>
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+ |breadtrail
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+ +-->
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+<div class="breadtrail">
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+<a href="http://www.apache.org/">Apache</a> > <a href="http://hadoop.apache.org/">Hadoop</a> > <a href="http://hadoop.apache.org/zookeeper/">ZooKeeper</a><script src="skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script>
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+<a class="selected" href="index.html">ZooKeeper 3.3 Documentation</a>
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+<!--+
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+<div class="menuitem">
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+<div onclick="SwitchMenu('menu_1.2', 'skin/')" id="menu_1.2Title" class="menutitle">Developer</div>
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+<div class="menuitem">
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+<a href="zookeeperProgrammers.html">Programmer's Guide</a>
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+</div>
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+<a href="javaExample.html">Java Example</a>
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+</div>
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+<div onclick="SwitchMenu('menu_1.3', 'skin/')" id="menu_1.3Title" class="menutitle">BookKeeper</div>
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+<div id="menu_1.3" class="menuitemgroup">
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+<div class="menuitem">
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+<a href="bookkeeperStarted.html">Getting started</a>
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+</div>
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+<div class="menuitem">
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+<a href="bookkeeperOverview.html">Overview</a>
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+</div>
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+<div class="menuitem">
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+<a href="bookkeeperConfig.html">Setup guide</a>
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+</div>
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+<div class="menuitem">
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+<a href="bookkeeperProgrammer.html">Programmer's guide</a>
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+</div>
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+</div>
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+<div onclick="SwitchMenu('menu_1.4', 'skin/')" id="menu_1.4Title" class="menutitle">Admin & Ops</div>
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+<div id="menu_1.4" class="menuitemgroup">
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+<div class="menuitem">
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+<a href="zookeeperAdmin.html">Administrator's Guide</a>
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+</div>
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+<div class="menuitem">
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+<a href="zookeeperQuotas.html">Quota Guide</a>
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+</div>
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+<div class="menuitem">
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+<a href="zookeeperJMX.html">JMX</a>
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+</div>
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+<div class="menuitem">
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+<a href="zookeeperObservers.html">Observers Guide</a>
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+</div>
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+</div>
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+<div onclick="SwitchMenu('menu_1.5', 'skin/')" id="menu_1.5Title" class="menutitle">Contributor</div>
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+<div id="menu_1.5" class="menuitemgroup">
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+<div class="menuitem">
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+<a href="zookeeperInternals.html">ZooKeeper Internals</a>
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+</div>
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+</div>
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+<div onclick="SwitchMenu('menu_1.6', 'skin/')" id="menu_1.6Title" class="menutitle">Miscellaneous</div>
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+<div class="menuitem">
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+<a href="http://wiki.apache.org/hadoop/ZooKeeper">Wiki</a>
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+</div>
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+<div class="menuitem">
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+<a href="http://wiki.apache.org/hadoop/ZooKeeper/FAQ">FAQ</a>
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+</div>
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+<a href="http://hadoop.apache.org/zookeeper/mailing_lists.html">Mailing Lists</a>
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+</div>
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+</div>
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+<div id="credit"></div>
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+<div id="roundbottom">
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+<img style="display: none" class="corner" height="15" width="15" alt="" src="skin/images/rc-b-l-15-1body-2menu-3menu.png"></div>
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+<!--+
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+ |alternative credits
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+ +-->
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+</div>
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+<!--+
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+ |end Menu
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+ +-->
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+<!--+
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+ |start content
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+ +-->
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+<div id="content">
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+<div title="Portable Document Format" class="pdflink">
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+<a class="dida" href="bookkeeperStream.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br>
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+ PDF</a>
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+</div>
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+<h1>Streaming with BookKeeper</h1>
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+<div id="minitoc-area">
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+<ul class="minitoc">
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+<li>
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+<a href="#bk_StreamSummary">Summary</a>
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+</li>
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+<li>
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+<a href="#bk_LedgerOutputStream">Writing a stream of bytes</a>
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+</li>
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+<li>
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+<a href="#bk_LedgerInputStream">Reading a stream of bytes</a>
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+</li>
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+</ul>
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+</div>
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+
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+
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+
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+
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+<a name="N10009"></a><a name="bk_StreamSummary"></a>
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+<h2 class="h3">Summary</h2>
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+<div class="section">
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+<p>
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+ When using the BookKeeper API, an application has to split the data to write into entries, each
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+ entry being a byte array. This is natural for many applications. For example, when using BookKeeper
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+ for write-ahead logging, an application typically wants to write the modifications corresponding
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+ to a command or a transaction. Some other applications, however, might not have a natural boundary
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+ for entries, and may prefer to write and read streams of bytes. This is exactly the purpose of the
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+ stream API we have implemented on top of BookKeeper.
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+ </p>
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+<p>
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+ The stream API is implemented in the package <span class="codefrag computeroutput">Streaming</span>, and it contains two main classes: <span class="codefrag computeroutput">LedgerOutputStream</span> and
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+ <span class="codefrag computeroutput">LedgerInputStream</span>. The class names are indicative of what they do.
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+ </p>
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+</div>
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+
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+
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+<a name="N10022"></a><a name="bk_LedgerOutputStream"></a>
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+<h2 class="h3">Writing a stream of bytes</h2>
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+<div class="section">
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+<p>
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+ Class <span class="codefrag computeroutput">LedgerOutputStream</span> implements two constructors and five public methods:
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+ </p>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public LedgerOutputStream(LedgerHandle lh)
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+ </span>
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+
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+</p>
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+<p>
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+ where:
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+ </p>
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+<ul>
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.
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+ </p>
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+
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+</li>
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+
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+</ul>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public LedgerOutputStream(LedgerHandle lh, int size)
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+ </span>
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+
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+</p>
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+<p>
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+ where:
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+ </p>
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+<ul>
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.
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+ </p>
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+
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+</li>
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+
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">size</span> is the size of the byte buffer to store written bytes before flushing.
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+ </p>
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+
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+</li>
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+
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+</ul>
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+<p>
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+
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+<strong>Closing a stream.</strong> This call closes the stream by flushing the write buffer.
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+ </p>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public void close()
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+ </span>
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+
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+</p>
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+<p>
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+ which has no parameters.
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+ </p>
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+<p>
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+
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+<strong>Flushing a stream.</strong> This call essentially flushes the write buffer.
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+ </p>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public synchronized void flush()
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+ </span>
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+
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+</p>
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+<p>
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+ which has no parameters.
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+ </p>
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+<p>
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+
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+<strong>Writing bytes.</strong> There are three calls for writing bytes to a stream.
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+ </p>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public synchronized void write(byte[] b)
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+ </span>
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+
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+</p>
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+<p>
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+ where:
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+ </p>
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+<ul>
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">b</span> is an array of bytes to write.
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+ </p>
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+
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+</li>
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+
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+</ul>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public synchronized void write(byte[] b, int off, int len)
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+ </span>
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+
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+</p>
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+<p>
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+ where:
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+ </p>
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+<ul>
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">b</span> is an array of bytes to write.
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+ </p>
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+
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+</li>
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+
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">off</span> is a buffer offset.
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+ </p>
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+
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+</li>
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+
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">len</span> is the length to write.
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+ </p>
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+
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+</li>
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+
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+</ul>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public synchronized void write(int b)
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+ </span>
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+
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+</p>
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+<p>
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+ where:
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+ </p>
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+<ul>
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">b</span> contains a byte to write. The method writes the least significant byte of the integer four bytes.
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+ </p>
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+
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+</li>
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+
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+</ul>
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+</div>
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+
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+
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+<a name="N100E7"></a><a name="bk_LedgerInputStream"></a>
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+<h2 class="h3">Reading a stream of bytes</h2>
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+<div class="section">
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+<p>
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+ Class <span class="codefrag computeroutput">LedgerOutputStream</span> implements two constructors and four public methods:
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+ </p>
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+<p>
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+
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+<span class="codefrag computeroutput">
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+ public LedgerInputStream(LedgerHandle lh)
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+ throws BKException, InterruptedException
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+ </span>
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+
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+</p>
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+<p>
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+ where:
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+ </p>
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+<ul>
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+
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+<li>
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+
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+<p>
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+
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+<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.
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+ </p>
|
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+
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+</li>
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+
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+</ul>
|
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+<p>
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+
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+<span class="codefrag computeroutput">
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|
+ public LedgerInputStream(LedgerHandle lh, int size)
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+ throws BKException, InterruptedException
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+ </span>
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+
|
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+</p>
|
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+<p>
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+ where:
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+ </p>
|
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+<ul>
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+
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+<li>
|
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+
|
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+<p>
|
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|
+
|
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|
+<span class="codefrag computeroutput">lh</span> is a ledger handle for a previously created and open ledger.
|
|
|
+ </p>
|
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+
|
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+</li>
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+
|
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+
|
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+<li>
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+
|
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+<p>
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|
+
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|
+<span class="codefrag computeroutput">size</span> is the size of the byte buffer to store bytes that the application
|
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|
+ will eventually read.
|
|
|
+ </p>
|
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|
+
|
|
|
+</li>
|
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|
+
|
|
|
+</ul>
|
|
|
+<p>
|
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|
+
|
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|
+<strong>Closing.</strong> There is one call to close an input stream, but the call
|
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|
+ is currently empty and the application is responsible for closing the ledger handle.
|
|
|
+ </p>
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">
|
|
|
+ public void close()
|
|
|
+ </span>
|
|
|
+
|
|
|
+</p>
|
|
|
+<p>
|
|
|
+ which has no parameters.
|
|
|
+ </p>
|
|
|
+<p>
|
|
|
+
|
|
|
+<strong>Reading.</strong> There are three calls to read from the stream.
|
|
|
+ </p>
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">
|
|
|
+ public synchronized int read()
|
|
|
+ throws IOException
|
|
|
+ </span>
|
|
|
+
|
|
|
+</p>
|
|
|
+<p>
|
|
|
+ which has no parameters.
|
|
|
+ </p>
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">
|
|
|
+ public synchronized int read(byte[] b)
|
|
|
+ throws IOException
|
|
|
+ </span>
|
|
|
+
|
|
|
+</p>
|
|
|
+<p>
|
|
|
+ where:
|
|
|
+ </p>
|
|
|
+<ul>
|
|
|
+
|
|
|
+<li>
|
|
|
+
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">b</span> is a byte array to write to.
|
|
|
+ </p>
|
|
|
+
|
|
|
+</li>
|
|
|
+
|
|
|
+</ul>
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">
|
|
|
+ public synchronized int read(byte[] b, int off, int len)
|
|
|
+ throws IOException
|
|
|
+ </span>
|
|
|
+
|
|
|
+</p>
|
|
|
+<p>
|
|
|
+ where:
|
|
|
+ </p>
|
|
|
+<ul>
|
|
|
+
|
|
|
+<li>
|
|
|
+
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">b</span> is a byte array to write to.
|
|
|
+ </p>
|
|
|
+
|
|
|
+</li>
|
|
|
+
|
|
|
+
|
|
|
+<li>
|
|
|
+
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">off</span> is an offset for byte array <span class="codefrag computeroutput">b</span>.
|
|
|
+ </p>
|
|
|
+
|
|
|
+</li>
|
|
|
+
|
|
|
+
|
|
|
+<li>
|
|
|
+
|
|
|
+<p>
|
|
|
+
|
|
|
+<span class="codefrag computeroutput">len</span> is the length in bytes to write to <span class="codefrag computeroutput">b</span>.
|
|
|
+ </p>
|
|
|
+
|
|
|
+</li>
|
|
|
+
|
|
|
+</ul>
|
|
|
+</div>
|
|
|
+
|
|
|
+<p align="right">
|
|
|
+<font size="-2"></font>
|
|
|
+</p>
|
|
|
+</div>
|
|
|
+<!--+
|
|
|
+ |end content
|
|
|
+ +-->
|
|
|
+<div class="clearboth"> </div>
|
|
|
+</div>
|
|
|
+<div id="footer">
|
|
|
+<!--+
|
|
|
+ |start bottomstrip
|
|
|
+ +-->
|
|
|
+<div class="lastmodified">
|
|
|
+<script type="text/javascript"><!--
|
|
|
+document.write("Last Published: " + document.lastModified);
|
|
|
+// --></script>
|
|
|
+</div>
|
|
|
+<div class="copyright">
|
|
|
+ Copyright ©
|
|
|
+ 2008 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a>
|
|
|
+</div>
|
|
|
+<!--+
|
|
|
+ |end bottomstrip
|
|
|
+ +-->
|
|
|
+</div>
|
|
|
+</body>
|
|
|
+</html>
|
Mahadev Konar