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<title>je.rep.quote (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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<h1 title="Package" class="title">Package je.rep.quote</h1>
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<div class="docSummary">
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<div class="block">JE Replication Stock Quote example.</div>
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</div>
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<p>See: <a href="#package.description">Description</a></p>
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<th class="colFirst" scope="col">Interface</th>
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</tr>
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<tbody>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../je/rep/quote/StockQuotesRMIForwarding.WriteServices.html" title="interface in je.rep.quote">StockQuotesRMIForwarding.WriteServices</a></td>
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<td class="colLast"> </td>
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<tr>
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<th class="colFirst" scope="col">Class</th>
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<th class="colLast" scope="col">Description</th>
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</tr>
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<tbody>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../je/rep/quote/HARouter.html" title="class in je.rep.quote">HARouter</a></td>
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<td class="colLast">
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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>.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote">RouterDrivenStockQuotes</a></td>
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<td class="colLast">
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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.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../je/rep/quote/RunTransaction.html" title="class in je.rep.quote">RunTransaction</a></td>
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<td class="colLast">
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<div class="block">Utility class to begin and commit/abort a transaction and handle exceptions
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according to this application's policies.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../je/rep/quote/SimpleRouter.html" title="class in je.rep.quote">SimpleRouter</a></td>
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<td class="colLast">
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<div class="block">This example illustrates the use of a simple HA-unaware router that is used
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in conjunction with <a href="../../../je/rep/quote/UpdateForwardingStockQuotes.html" title="class in je.rep.quote"><code>UpdateForwardingStockQuotes</code></a>.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote">StockQuotes</a></td>
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<td class="colLast">
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<div class="block">The most basic demonstration of a replicated application.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../je/rep/quote/StockQuotesRMIForwarding.html" title="class in je.rep.quote">StockQuotesRMIForwarding</a></td>
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<td class="colLast">
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<div class="block">This example is a small variation on the basic <a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote"><code>StockQuotes</code></a> example.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><a href="../../../je/rep/quote/UpdateForwardingStockQuotes.html" title="class in je.rep.quote">UpdateForwardingStockQuotes</a></td>
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<td class="colLast">
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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.</div>
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</td>
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</tr>
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</tbody>
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</table>
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</li>
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</ul>
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<a name="package.description">
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<!-- -->
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</a>
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<h2 title="Package je.rep.quote Description">Package je.rep.quote Description</h2>
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<div class="block">JE Replication Stock Quote example.
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<h2>Example Overview</h2>
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This example is a simple but complete demonstration of a replicated
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application. The application is a mock stock ticker which stores stock values
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in a replicated JE environment. The following commands are accepted:
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<ul>
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<li><stock> <number> : enter this stock price into the
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database</li>
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<li>print : print all the stocks and current prices held in the database</li>
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<li>quit : shut down</li>
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</ul>
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<p>
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There are three versions of the example which illustrate different application
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designs and aspects of JE functionality. Please be sure to walk through the
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three examples in the order listed below, since the information in one example
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builds on the one before it. The javadoc description for each class describes
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the example and explains how to run it. More detailed information is found in
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the example source code.
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<ol>
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<li><a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote"><code>StockQuotes</code></a>: This example is the most
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basic demonstration of a replicated application. It's intended to help gain an
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understanding of basic HA concepts and demonstrate use of the HA APIs to create
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a replicated environment and issue read and write transactions.
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</li><br>
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<li><a href="../../../je/rep/quote/RouterDrivenStockQuotes.html" title="class in je.rep.quote"><code>RouterDrivenStockQuotes</code></a> and
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<a href="../../../je/rep/quote/HARouter.html" title="class in je.rep.quote"><code>HARouter</code></a>: This example is based on <code>StockQuotes</code> and illustrates use of an HA-aware router (implemented by <code>HARouter</code>), in conjunction with 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> class, to direct application requests, based upon the type of request
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(read or write) and the state (Master or Replica) of a node in the replication
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group. This example is meant to illustrate how a software load balancer might
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be integrated with JE HA, where <code>HARouter</code> plays the role of the load
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balancer for purposes of the example.
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</li><br>
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<li><a href="../../../je/rep/quote/UpdateForwardingStockQuotes.html" title="class in je.rep.quote"><code>UpdateForwardingStockQuotes</code></a> and <a href="../../../je/rep/quote/SimpleRouter.html" title="class in je.rep.quote"><code>SimpleRouter</code></a>: This example is based on <code>RouterDrivenStockQuotes</code> and
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illustrates use of an HA unaware router (implemented by <code>SimpleRouter</code>),
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that load 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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</li>
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</ol>
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<em>Disclaimer:</em> This example is intended to be illustrative. The example
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is single threaded, while actual applications may be multithreaded. The
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example forwards requests as text and receives responses in text form, while
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actual applications may for example, forward HTTP requests, or use some other
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application level network protocol to forward such requests. The example opens
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and closes a socket to send each request, while actual applications will
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typically use a connection management facility.
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<p>
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The example
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<a href="../../../je/rep/quote/StockQuotesRMIForwarding.html" title="class in je.rep.quote"><code>StockQuotesRMIForwarding</code></a>,
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a minor variation to the basic <a href="../../../je/rep/quote/StockQuotes.html" title="class in je.rep.quote"><code>StockQuotes</code></a>
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example is also included in this package. It's intended to help illustrate how
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RMI could be used to forward write requests from a Replica to the Master.
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</p></div>
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</div>
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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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<p class="legalCopy"><small><font size=1>Copyright (c) 2002, 2017 Oracle and/or its affiliates. All rights reserved.</font> </small></p>
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