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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>UpdateForwardingStockQuotes (Oracle - Berkeley DB Java Edition Examples)</title>
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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 UpdateForwardingStockQuotes" class="title">Class UpdateForwardingStockQuotes</h2>
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</div>
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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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<li>
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<ul class="inheritance">
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<li><a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote">je.rep.quote.RouterDrivenStockQuotes</a></li>
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<li>
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<ul class="inheritance">
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<li>je.rep.quote.UpdateForwardingStockQuotes</li>
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</ul>
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</li>
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</ul>
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<br>
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<pre>public class <span class="typeNameLabel">UpdateForwardingStockQuotes</span>
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extends <a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote">RouterDrivenStockQuotes</a></pre>
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<div class="block">This class is based on <a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote"><code>RouterDrivenStockQuotes</code></a> and illustrates use
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of an HA unaware router (implemented by <a href="../../../je/rep/quote/SimpleRouter.html" title="class in je.rep.quote"><code>SimpleRouter</code></a>), that load
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balances requests (both read and write) across all the nodes in a
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replication group. This example is meant to illustrate how a load balancer
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appliance might fit into the JE HA architecture, where <code>SimpleRouter</code>
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plays the role of the load balancer appliance for 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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The router is unaware of the state (Master or Replica) of each node, or the
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type (read or write) of the request. Nodes use the <a href="../../../../java/com/sleepycat/je/rep/StateChangeListener.html?is-external=true" title="class or interface in com.sleepycat.je.rep"><code>StateChangeListener</code></a> to track the
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node that is currently the master and redirect write requests to it. That
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is, unlike the <a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote"><code>RouterDrivenStockQuotes</code></a> example, it's the nodes and
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not the router that keeps track of the current master.
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<p>
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In this example, unlike <code>StockQuotes</code>, only the
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<a href="../../../je/rep/quote/SimpleRouter.html" title="class in je.rep.quote"><code>SimpleRouter</code></a> has a console associated with it. It accepts commands
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typed into its console and forwards them as appropriate to the nodes in the
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group. The logic for tracking the Master resides in each node, and is
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supplied by the <a href="../../../../java/com/sleepycat/je/rep/StateChangeListener.html?is-external=true" title="class or interface in com.sleepycat.je.rep"><code>StateChangeListener</code></a>.
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<p>
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Each node, which in this example is an instance of
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<code>UpdateForwardingStockQuotes</code>, establishes a server socket on
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which it can listen for requests from <code>SimpleRouter</code>. Read
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requests are processed directly by the node. Write requests are redirected
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to the current master and the result is communicated back to
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<code>SimpleRouter</code>.
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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 and Write requests
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| SimpleRouter |------------------------------------||
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| Instance |---------------------|| ||
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---------------- || || ||
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\/ || ||
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------------------------------- || ||
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| UpdateForwardingStockQuotes | || ||
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| Instance 1: Master | || ||
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------------------------------- \/ ||
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/\ ------------------------------- ||
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|| | UpdateForwardingStockQuotes | ||
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||---------- | Instance 2: Replica | ||
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|| Write ------------------------------- \/
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|| requests -------------------------------
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|| | UpdateForwardingStockQuotes |
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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 java vm.
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<p>
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For example, the first node can be started as follows:
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<pre>
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java je.rep.quote.UpdateForwardingStockQuotes -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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<p>
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This instance of the application will therefore use port 5001 for HA, and,
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by convention, port 5101 (5001 + <code>HARouter.APP_PORT_DISPLACEMENT</code>)
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for application messages sent to it.
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<p>
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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/SimpleRouter.html" title="class in je.rep.quote"><code>SimpleRouter</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/SimpleRouter.html" title="class in je.rep.quote"><code>SimpleRouter</code></a></dd>
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<!-- ========== METHOD SUMMARY =========== -->
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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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<th class="colFirst" scope="col">Modifier and Type</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/UpdateForwardingStockQuotes.html#main-java.lang.String:A-">main</a></span>(java.lang.String[] argv)</code> </td>
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<!-- -->
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</a>
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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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<!-- -->
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</a>
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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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<!-- ============ METHOD DETAIL ========== -->
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<a name="main-java.lang.String:A-">
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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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