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<div class="aboutLanguage"><b>Berkeley DB Java Edition</b><br><font size=\"-1\"> version 7.5.11</font>
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<h2 title="Class Monitor" class="title">Class Monitor</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>com.sleepycat.je.rep.monitor.Monitor</li>
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<pre>public class <span class="typeNameLabel">Monitor</span>
extends java.lang.Object</pre>
<div class="block">Provides a lightweight mechanism to track the current master node and the
members of the replication group. The information provided by the monitor
can be used to route update requests to the node that is currently the
master and distribute read requests across the other members of the group.
<p>
The Monitor is typically run on a machine that participates in load
balancing, request routing or is simply serving as a basis for application
level monitoring and does not have a replicated environment. To avoid
creating a single point of failure, an application may need to create
multiple monitor instances, with each monitor running on a distinct machine.
<p>
Applications with direct access to a <a href="../../../../../com/sleepycat/je/rep/ReplicatedEnvironment.html" title="class in com.sleepycat.je.rep"><code>ReplicatedEnvironment</code></a> can use
its <a href="../../../../../../ReplicationGuide/replicawrites.html">
synchronous and asynchronous mechanisms</a> for determining the master node
and group composition changes. The Monitor class is not needed by such
applications.
<p>
The Monitor generally learns about changes to group status through events
issued by replication group members. In addition, the Monitor maintains a
daemon thread which periodically pings members of the group so that the
Monitor can proactively discover group status changes that occur when it is
down or has lost network connectivity.
<p>
The following code excerpt illustrates the typical code sequence used to
initiate a Monitor. Exception handling has been omitted to simplify the
example.
<pre class="code">
MonitorConfig monConfig = new MonitorConfig();
monConfig.setGroupName("PlanetaryRepGroup");
monConfig.setNodeName("mon1");
monConfig.setNodeHostPort("monhost1.acme.com:7000");
monConfig.setHelperHosts("mars.acme.com:5000,jupiter.acme.com:5000");
Monitor monitor = new Monitor(monConfig);
// If the monitor has not been registered as a member of the group,
// register it now. register() returns the current node that is the
// master.
ReplicationNode currentMaster = monitor.register();
// Start up the listener, so that it can be used to track changes
// in the master node, or group composition. It can also be used to help
// determine the electable nodes that are currently active and participating
// in the replication group.
monitor.startListener(new MyChangeListener());
</pre></div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../com/sleepycat/je/rep/monitor/MonitorChangeListener.html" title="interface in com.sleepycat.je.rep.monitor"><code>MonitorChangeListener</code></a>,
<a href="../../../../../../ReplicationGuide/monitors.html">Writing Monitor
Nodes</a>,
<a
href="../../../../../../examples/je/rep/quote/package-summary.html">je.rep.quote
Examples</a></dd>
</dl>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#Monitor-com.sleepycat.je.rep.monitor.MonitorConfig-">Monitor</a></span>(<a href="../../../../../com/sleepycat/je/rep/monitor/MonitorConfig.html" title="class in com.sleepycat.je.rep.monitor">MonitorConfig</a>&nbsp;monitorConfig)</code>
<div class="block">Creates a monitor instance.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#Monitor-com.sleepycat.je.rep.ReplicationConfig-">Monitor</a></span>(<a href="../../../../../com/sleepycat/je/rep/ReplicationConfig.html" title="class in com.sleepycat.je.rep">ReplicationConfig</a>&nbsp;monitorConfig)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">As of JE 5, replaced by
<a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#Monitor-com.sleepycat.je.rep.monitor.MonitorConfig-"><code>Monitor(MonitorConfig)</code></a></span></div>
</div>
</td>
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<h3>Method Summary</h3>
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<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../com/sleepycat/je/rep/ReplicationGroup.html" title="class in com.sleepycat.je.rep">ReplicationGroup</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#getGroup--">getGroup</a></span>()</code>
<div class="block">Returns the current composition of the group.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#getGroupName--">getGroupName</a></span>()</code>
<div class="block">Returns the name of the group associated with the Monitor.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#getMasterNodeName--">getMasterNodeName</a></span>()</code>
<div class="block">Identifies the master of the replication group, resulting from the last
successful election.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>java.net.InetSocketAddress</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#getMonitorSocketAddress--">getMonitorSocketAddress</a></span>()</code>
<div class="block">Returns the socket used by this monitor to listen for group changes</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#getNodeName--">getNodeName</a></span>()</code>
<div class="block">Returns the group-wide unique name associated with the monitor</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../com/sleepycat/je/rep/ReplicationNode.html" title="interface in com.sleepycat.je.rep">ReplicationNode</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#register--">register</a></span>()</code>
<div class="block">Registers the monitor with the group so that it can be kept informed
of the outcome of elections and group membership changes.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#shutdown--">shutdown</a></span>()</code>
<div class="block">Release monitor resources and shut down the monitor.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#startListener-com.sleepycat.je.rep.monitor.MonitorChangeListener-">startListener</a></span>(<a href="../../../../../com/sleepycat/je/rep/monitor/MonitorChangeListener.html" title="interface in com.sleepycat.je.rep.monitor">MonitorChangeListener</a>&nbsp;newListener)</code>
<div class="block">Starts the listener so it's actively listening for election results and
broadcasts of replication group changes.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>Monitor</h4>
<pre>@Deprecated
public&nbsp;Monitor(<a href="../../../../../com/sleepycat/je/rep/ReplicationConfig.html" title="class in com.sleepycat.je.rep">ReplicationConfig</a>&nbsp;monitorConfig)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">As of JE 5, replaced by
<a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#Monitor-com.sleepycat.je.rep.monitor.MonitorConfig-"><code>Monitor(MonitorConfig)</code></a></span></div>
<div class="block">Deprecated as of JE5. Creates a monitor instance using a <a href="../../../../../com/sleepycat/je/rep/ReplicationConfig.html" title="class in com.sleepycat.je.rep"><code>ReplicationConfig</code></a>. Monitor-specific properties that are not available
in ReplicationConfig use default settings.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified.</dd>
</dl>
</li>
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<a name="Monitor-com.sleepycat.je.rep.monitor.MonitorConfig-">
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<h4>Monitor</h4>
<pre>public&nbsp;Monitor(<a href="../../../../../com/sleepycat/je/rep/monitor/MonitorConfig.html" title="class in com.sleepycat.je.rep.monitor">MonitorConfig</a>&nbsp;monitorConfig)</pre>
<div class="block">Creates a monitor instance.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>monitorConfig</code> - configuration used by a Monitor</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified.</dd>
</dl>
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<h4>getGroupName</h4>
<pre>public&nbsp;java.lang.String&nbsp;getGroupName()</pre>
<div class="block">Returns the name of the group associated with the Monitor.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the group name</dd>
</dl>
</li>
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<h4>getNodeName</h4>
<pre>public&nbsp;java.lang.String&nbsp;getNodeName()</pre>
<div class="block">Returns the group-wide unique name associated with the monitor</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the monitor name</dd>
</dl>
</li>
</ul>
<a name="getMonitorSocketAddress--">
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<h4>getMonitorSocketAddress</h4>
<pre>public&nbsp;java.net.InetSocketAddress&nbsp;getMonitorSocketAddress()</pre>
<div class="block">Returns the socket used by this monitor to listen for group changes</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the monitor socket address</dd>
</dl>
</li>
</ul>
<a name="register--">
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<h4>register</h4>
<pre>public&nbsp;<a href="../../../../../com/sleepycat/je/rep/ReplicationNode.html" title="interface in com.sleepycat.je.rep">ReplicationNode</a>&nbsp;register()
throws <a href="../../../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></pre>
<div class="block">Registers the monitor with the group so that it can be kept informed
of the outcome of elections and group membership changes. The
monitor, just like a replication node, is identified by its nodeName.
The Monitor uses the helper nodes to locate a master with which it can
register itself. If the helper nodes are not available the registration
will fail.
<p>
A monitor must be registered at least once in order to be informed of
ongoing election results and group changes. Attempts to re-register the
same monitor are ignored. Registration, once it has been completed
successfully, persists beyond the lifetime of the Monitor instance and
does not need to be repeated. Repeated registrations are benign and
merely confirm that the current monitor configuration is consistent with
earlier registrations of this monitor.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the node that is the current master</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if the monitor has been shutdown, or no
helper sockets were specified at Monitor initialization.</dd>
</dl>
</li>
</ul>
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<h4>startListener</h4>
<pre>public&nbsp;void&nbsp;startListener(<a href="../../../../../com/sleepycat/je/rep/monitor/MonitorChangeListener.html" title="interface in com.sleepycat.je.rep.monitor">MonitorChangeListener</a>&nbsp;newListener)
throws <a href="../../../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a>,
java.io.IOException</pre>
<div class="block">Starts the listener so it's actively listening for election results and
broadcasts of replication group changes.
<p>
<a href="../../../../../com/sleepycat/je/rep/monitor/Monitor.html#register--"><code>register()</code></a> should be called before starting the listener.
If the monitor has not been registered, it will not be updated, and its
listener will not be invoked.
<p>
Once the registration has been completed, the Monitor can start
listening even if none of the other nodes in the group are available.
It will be contacted automatically by the other nodes as they come up.
<p>
If the group has a Master, invoking <code>startListener</code> results
in a synchronous callback to the application via the <a href="../../../../../com/sleepycat/je/rep/monitor/MonitorChangeListener.html#notify-com.sleepycat.je.rep.monitor.NewMasterEvent-"><code>MonitorChangeListener.notify(NewMasterEvent)</code></a> method. If there is no
Master at this time, the callback takes place asynchronously, after the
method returns, when a Master is eventually elected.
<p>
Starting the listener will start the underlying ping thread, which
proactively checks group status for changes that might have been
missed when this Monitor instance has lost network connectivity or
is down.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>newListener</code> - the listener used to monitor events of interest.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.io.IOException</code> - if the monitor socket could not be set up</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if an invalid parameter is specified.</dd>
<dd><code>java.lang.IllegalStateException</code> - if the monitor has been shutdown, or a
listener has already been established.</dd>
<dd><code><a href="../../../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
<a name="getMasterNodeName--">
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<h4>getMasterNodeName</h4>
<pre>public&nbsp;java.lang.String&nbsp;getMasterNodeName()
throws <a href="../../../../../com/sleepycat/je/rep/UnknownMasterException.html" title="class in com.sleepycat.je.rep">UnknownMasterException</a></pre>
<div class="block">Identifies the master of the replication group, resulting from the last
successful election. This method relies on the helper nodes supplied
to the monitor and queries them for the master.
This method is useful when a Monitor first starts up and the Master
needs to be determined. Once a Monitor is registered and the Listener
has been started, it's kept up to date via events that are delivered
to the Listener.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the id associated with the master replication node.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../com/sleepycat/je/rep/UnknownMasterException.html" title="class in com.sleepycat.je.rep">UnknownMasterException</a></code> - if the master could not be determined
from the set of helpers made available to the Monitor.</dd>
<dd><code><a href="../../../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if the monitor has been shutdown.</dd>
</dl>
</li>
</ul>
<a name="getGroup--">
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<h4>getGroup</h4>
<pre>public&nbsp;<a href="../../../../../com/sleepycat/je/rep/ReplicationGroup.html" title="class in com.sleepycat.je.rep">ReplicationGroup</a>&nbsp;getGroup()
throws <a href="../../../../../com/sleepycat/je/rep/UnknownMasterException.html" title="class in com.sleepycat.je.rep">UnknownMasterException</a>,
<a href="../../../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></pre>
<div class="block">Returns the current composition of the group. It does so by first
querying the helpers to determine the master and then obtaining the
group information from the master.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an instance of RepGroup denoting the current composition of the
group</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../../com/sleepycat/je/rep/UnknownMasterException.html" title="class in com.sleepycat.je.rep">UnknownMasterException</a></code> - if the master could not be determined
from the set of helpers made available to the Monitor.</dd>
<dd><code><a href="../../../../../com/sleepycat/je/EnvironmentFailureException.html" title="class in com.sleepycat.je">EnvironmentFailureException</a></code> - if an unexpected, internal or
environment-wide failure occurs.</dd>
<dd><code>java.lang.IllegalStateException</code> - if the monitor has been shutdown.</dd>
<dd><code><a href="../../../../../com/sleepycat/je/DatabaseException.html" title="class in com.sleepycat.je">DatabaseException</a></code></dd>
</dl>
</li>
</ul>
<a name="shutdown--">
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<h4>shutdown</h4>
<pre>public&nbsp;void&nbsp;shutdown()
throws java.lang.InterruptedException</pre>
<div class="block">Release monitor resources and shut down the monitor.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.InterruptedException</code></dd>
</dl>
</li>
</ul>
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