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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>RouterDrivenStockQuotes (Oracle - Berkeley DB Java Edition Examples)</title>
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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 RouterDrivenStockQuotes" class="title">Class RouterDrivenStockQuotes</h2>
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<ul class="inheritance">
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<li><a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote">je.rep.quote.StockQuotes</a></li>
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<ul class="inheritance">
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<li>je.rep.quote.RouterDrivenStockQuotes</li>
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</li>
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<dt>Direct Known Subclasses:</dt>
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<dd><a href="../../../je/rep/quote/UpdateForwardingStockQuotes.html" title="class in je.rep.quote">UpdateForwardingStockQuotes</a></dd>
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<br>
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<pre>public class <span class="typeNameLabel">RouterDrivenStockQuotes</span>
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extends <a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote">StockQuotes</a></pre>
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<div class="block">This class is based on <a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote"><code>StockQuotes</code></a> and illustrates use of an
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HA-aware router (implemented by <a href="../../../je/rep/quote/HARouter.html" title="class in je.rep.quote"><code>HARouter</code></a>), in conjunction with the
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<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> class, to direct
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application requests, based upon the type of request (read or write) and the
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state (Master or Replica) of a node in the replication group. This example
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is meant to illustrate how a software load balancer might be integrated with
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JE HA, where <code>HARouter</code> plays the role of the load balancer for
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purposes of the example.
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<p>
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Be sure to read the <a href="../../../je/rep/quote/package-summary.html"><code>Example Overview</code></a> first to put this
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example into context.
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<p>
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In this example, unlike <code>StockQuotes</code>, only the HARouter has a
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console associated with it. It accepts commands typed into its console and
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forwards them as appropriate to the Master and Replicas in the group. The
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logic for tracking the Master resides in <code>HARouter</code>, and
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information about the state of the replication group is supplied by the
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<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>. While this example
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uses just one HARouter instance for the entire group, production
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applications could use multiple router instances to avoid single points of
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failure.
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<p>
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Each node, which in this example is an instance of
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<code>RouterDrivenStockQuotes</code>, establishes a server socket on which
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it can listen for requests from HARouter. The node that is currently the
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Master will expect both write and read requests from HARouter, while nodes
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that are Replicas will only expect read requests from the router.
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<p>
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The request flow between nodes in this example is shown below.
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<pre>
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------------ Read requests
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| HARouter |------------------------------------||
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| Instance |---------------------|| ||
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------------ || ||
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|| Write requests || ||
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\/ || ||
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--------------------------- || ||
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| RouterDrivenStockQuotes | || ||
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| Instance 1: Master | || ||
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--------------------------- \/ ||
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--------------------------- ||
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| RouterDrivenStockQuotes | ||
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| Instance 2: Replica | ||
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--------------------------- \/
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---------------------------
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| RouterDrivenStockQuotes |
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| Instance 3: Replica |
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---------------------------
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...more Replica instances...
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</pre>
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<p>
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This example is intended to be illustrative. It forwards requests as text,
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and receives responses in text form. Actual applications may for example,
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forward HTTP requests, or use some other application level network protocol
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to forward such requests.
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<p>
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Please review the javadoc in <a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote"><code>StockQuotes</code></a> for a detailed description
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of the arguments that must be supplied at startup. The only difference is
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that you must use the name of this class when invoking the JVM. For example,
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the first node can be started as follows:
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<pre>
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java je.rep.quote.RouterDrivenStockQuotes -env /tmp/stockQuotes1 \
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-nodeName n1 \
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-nodeHost node.acme.com:5001 \
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-helperHost node.acme.com:5001
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</pre>
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In addition to starting the nodes, you will also need to start the
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<a href="../../../je/rep/quote/HARouter.html" title="class in je.rep.quote"><code>HARouter</code></a> as described in its javadoc.</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/HARouter.html" title="class in je.rep.quote"><code>HARouter</code></a></dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
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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/RouterDrivenStockQuotes.html#main-java.lang.String:A-">main</a></span>(java.lang.String[] argv)</code> </td>
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<!-- -->
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<h3>Methods inherited from class je.rep.quote.<a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote">StockQuotes</a></h3>
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<code><a href="../../../je/rep/quote/StockQuotes.html#quit-java.io.PrintStream-">quit</a></code></li>
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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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<dl>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code>java.lang.Exception</code></dd>
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</dl>
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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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