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<h2 title="Interface StateChangeListener" class="title">Interface StateChangeListener</h2>
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<pre>public interface <span class="typeNameLabel">StateChangeListener</span></pre>
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<div class="block">An asynchronous mechanism for tracking the <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.State.html" title="enum in com.sleepycat.je.rep"><code>State</code></a> of the replicated environment and
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choosing how to route database operations. <code>State</code> determines which
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The Listener is registered with the replicated environment using <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.html#setStateChangeListener-com.sleepycat.je.rep.StateChangeListener-"><code>ReplicatedEnvironment.setStateChangeListener(StateChangeListener)</code></a>. There
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is at most one Listener associated with the actual environment (not an
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<a href="../../../../com/sleepycat/je/Environment.html" title="class in com.sleepycat.je"><code>Environment</code></a> handle) at any given instance in time.
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See the <a
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href="../../../../../examples/je/rep/quote/package-summary.html">
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examples</a> for information on different approaches toward routing
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database operations and an example of using the StateChangeListener.</div>
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<dt><span class="seeLabel">See Also:</span></dt>
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<dd><a href="../../../../../ReplicationGuide/replicawrites.html">Managing
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Write Requests at a Replica</a></dd>
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/sleepycat/je/rep/StateChangeListener.html#stateChange-com.sleepycat.je.rep.StateChangeEvent-">stateChange</a></span>(<a href="../../../../com/sleepycat/je/rep/StateChangeEvent.html" title="class in com.sleepycat.je.rep">StateChangeEvent</a> stateChangeEvent)</code>
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<div class="block">The notification method.</div>
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<a name="stateChange-com.sleepycat.je.rep.StateChangeEvent-">
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<h4>stateChange</h4>
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<pre>void stateChange(<a href="../../../../com/sleepycat/je/rep/StateChangeEvent.html" title="class in com.sleepycat.je.rep">StateChangeEvent</a> stateChangeEvent)
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throws java.lang.RuntimeException</pre>
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<div class="block">The notification method. It is initially invoked when the <code>StateChangeListener</code> is first associated with the <code>ReplicatedEnvironment</code> via the <a href="../../../../com/sleepycat/je/rep/ReplicatedEnvironment.html#setStateChangeListener-com.sleepycat.je.rep.StateChangeListener-"><code>ReplicatedEnvironment.setStateChangeListener(StateChangeListener)</code></a>
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method and subsequently each time there is a state change.
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<p>
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This method should do the minimal amount of work, queuing any resource
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intensive operations for processing by another thread before returning
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to the caller, so that it does not unduly delay the other housekeeping
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operations performed by the internal thread which invokes this method.
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>stateChangeEvent</code> - the new state change event</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code>java.lang.RuntimeException</code> - Any uncaught exceptions will result in the
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shutdown of the ReplicatedEnvironment.</dd>
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