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<!-- Generated by javadoc (1.8.0_151) on Tue Oct 31 17:36:52 EDT 2017 -->
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<title>HARouter (Oracle - Berkeley DB Java Edition Examples)</title>
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<div class="aboutLanguage"><b>Berkeley DB Java Edition Examples</b><br><font size=\"-1\"> version 7.5.11</font>
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<!-- ======== START OF CLASS DATA ======== -->
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<div class="header">
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<div class="subTitle">je.rep.quote</div>
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<h2 title="Class HARouter" class="title">Class HARouter</h2>
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<ul class="inheritance">
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<li>je.rep.quote.HARouter</li>
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<hr>
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<br>
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<pre>public class <span class="typeNameLabel">HARouter</span>
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extends java.lang.Object</pre>
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<div class="block">This example illustrates use of an HA aware Router used to forward high
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level requests to replication nodes implemented by
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<a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote"><code>RouterDrivenStockQuotes</code></a>. The router is built using the APIs provided
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by the <a href="../../../../java/com/sleepycat/je/rep/monitor/Monitor.html?is-external=true" title="class or interface in com.sleepycat.je.rep.monitor"><code>Monitor</code></a>; it's a
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standalone application and does not itself access a JE Environment. The
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router forwards logical requests, that represent some service provided by
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the application. It only has knowledge of whether a request will potentially
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require an write to the database, but does not have any other application
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level logic, nor does it access a JE environment. The HARouter accepts a
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request from the console and dispatches it to the application running on the
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master, if it's a write request, or to one of the replicas if it's a read
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request. The HARouter keeps track of the current Master via the events that
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are delivered to the Monitor.
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<p>
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It's the HARouter instead of each individual node (as in the
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<a href="../../../je/rep/quote/UpdateForwardingStockQuotes.html" title="class in je.rep.quote"><code>UpdateForwardingStockQuotes</code></a> example) that tracks the current Master
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via the <a href="../../../../java/com/sleepycat/je/rep/monitor/Monitor.html?is-external=true" title="class or interface in com.sleepycat.je.rep.monitor"><code>Monitor</code></a>. Since the
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router ensures that writes are directed to the master node, the logic in
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the node itself is simpler: the node simply services the requests forwarded
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to it by the router on a port dedicated for this purpose.
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<p>
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The protocol used to communicate between the router and the nodes has been
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deliberately kept very simple. In particular, it makes limited provisions
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for error reporting back to the router.
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<p>
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The router requires the following arguments:
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<pre>
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java je.rep.quote.HARouter -nodeName <nodeName> \
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-nodeHost <host:port> \
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-helperHost <host:port>"
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The arguments are described below:
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-nodeName identifies the monitor name associated with this Router
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-nodeHost the hostname:port combination used by the Monitor to listen for
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election results and group level changes.
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-helperHost one or more nodes that may be used by the Monitor to locate the
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Master and register the Monitor with the Master.
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</pre>
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Note that the arguments are similar to the ones used to start a replication
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node. A key difference is that the -env option is absent, since the router
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is standalone and is not associated with one.
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<p>
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The router can be started as follows:
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<pre>
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java je.rep.quote.HARouter -nodeName n1 \
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-nodeHost node.acme.com:6000 \
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-helperHost node.acme.com:5001
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</pre>
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The replication nodes involved in the routing can be started as described in
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<a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote"><code>RouterDrivenStockQuotes</code></a>. The Router and the nodes can be started in
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any convenient order.</div>
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<dl>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote"><code>RouterDrivenStockQuotes</code></a></dd>
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<h3>Method Summary</h3>
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<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<td class="colFirst"><code>static void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../je/rep/quote/HARouter.html#main-java.lang.String:A-">main</a></span>(java.lang.String[] argv)</code> </td>
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<h3>Methods inherited from class java.lang.Object</h3>
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<code>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>main</h4>
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<pre>public static void main(java.lang.String[] argv)
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throws java.lang.Exception</pre>
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<div class="aboutLanguage"><b>Berkeley DB Java Edition Examples</b><br><font size=\"-1\"> version 7.5.11</font>
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