content/release-doc/current/internals/net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html - river-site - Git at Google

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 <h2 title="Class AbstractLookupDiscovery.UnicastDiscoveryTask" class="title">Class AbstractLookupDiscovery.UnicastDiscoveryTask</h2>
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 <pre>private class <span class="typeNameLabel">AbstractLookupDiscovery.UnicastDiscoveryTask</span>
 extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
 implements <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></pre>
 <div class="block">Task which retrieves elements from the set of pendingDiscoveries and
   performs the appropriate processing based on the object type of
   the element.
   <p>
   Each element of the set of pendingDiscoveries is one of the following
   object types: Socket, LookupLocator, CheckGroupsMarker,
   or CheckReachabilityMarker.
   <p>
   When the element to process is a Socket, the element was a result
   of a multicast request/response exchange (see the Requestor and
   ResponseListener Thread classes). In this case, this task completes
   the discovery of the associated lookup service by performing the
   final stage of unicast discovery, ultimately resulting in a discovered
   event being sent to all registered listeners.
   <p>
   When the element to process is a LookupLocator, the element was a
   result of a multicast announcement received from a lookup service -
   belonging to at least one group of interest - which has not already
   been discovered. In this case, this task also completes the discovery
   of the lookup service referenced in the announcement by performing the
   final stage of unicast discovery, ultimately resulting in a discovered
   event being sent to all registered listeners.
   <p>
   When the element to process is a CheckGroupsMarker, the
   element was a result of a multicast announcement received from an
   already-discovered lookup service whose member groups have changed
   in some way. In this case, this task determines how those member
   groups have changed and, based on how they have changed, whether
   (or not) to send a discarded event or a changed event to the
   appropriate registered listeners.
   <p>
   When the element to process is a CheckReachabilityMarker, the
   element was a result of a determination that the multicast
   announcements from an already-discovered lookup service have
   stopped being received (see the AnnouncementTimerThread class).
   In this case, this task determines if the affected lookup service
   is still available ("reachable"). If this task cannot communicate
   with the lookup service, a discarded event is queued to be sent
   to all registered listeners.
   <p>
   Rather than performing unicast discovery synchronously, after multicast
   discovery has occurred in either the AnnouncementListener thread
   (the multicast announcement protocol) or the ResponseListener thread
   (the multicast request protocol), the unicast discovery processing
   that is required to complete the discovery process is queued for
   asynchronous execution in this task. Unicast discovery is performed
   asynchronously because unicast discovery can take quite a while to
   fail if a lookup service "disappears" (because the network or the
   lookup service itself has crashed) between the time a multicast
   announcement or response indicates the existence of a lookup service
   eligible for unicast discovery, and the time unicast discovery
   actually starts. If unicast discovery is performed synchronously
   in the threads that implement the multicast announcement and multicast
   request protocols, other multicast announcements (as well as other
   unicast discoveries) will be missed whenever a lookup service
   disappears prior to the commencement of the unicast discovery stage.</div>
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 <td class="colFirst"><code>private <a href="../../../org/apache/river/thread/WakeupManager.Ticket.html" title="class in org.apache.river.thread">WakeupManager.Ticket</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#ticket">ticket</a></span></code>&nbsp;</td>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#UnicastDiscoveryTask-java.lang.Object-">UnicastDiscoveryTask</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;req)</code>&nbsp;</td>
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 <td class="colOne"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#UnicastDiscoveryTask-java.lang.Object-boolean-">UnicastDiscoveryTask</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;req,
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 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#doRun--">doRun</a></span>()</code>&nbsp;</td>
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 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#run--">run</a></span>()</code>
 <div class="block">Restore the privileged context and run</div>
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 <pre>private final&nbsp;<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> req</pre>
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 <pre>private&nbsp;<a href="../../../org/apache/river/thread/WakeupManager.Ticket.html" title="class in org.apache.river.thread">WakeupManager.Ticket</a> ticket</pre>
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 <h4>UnicastDiscoveryTask</h4>
 <pre>UnicastDiscoveryTask(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;req)</pre>
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 <pre>UnicastDiscoveryTask(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;req,
                      boolean&nbsp;delayRun)</pre>
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 <pre>public&nbsp;void&nbsp;run()</pre>
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 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true#run--" title="class or interface in java.lang">run</a></code>&nbsp;in interface&nbsp;<code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></code></dd>
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	<div class="subTitle">net.jini.discovery</div>
	<h2 title="Class AbstractLookupDiscovery.UnicastDiscoveryTask" class="title">Class AbstractLookupDiscovery.UnicastDiscoveryTask</h2>
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	<li><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
	<li>
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	<li>net.jini.discovery.AbstractLookupDiscovery.UnicastDiscoveryTask</li>
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	<dt>All Implemented Interfaces:</dt>
	<dd><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></dd>
	</dl>
	<dl>
	<dt>Enclosing class:</dt>
	<dd><a href="../../../net/jini/discovery/AbstractLookupDiscovery.html" title="class in net.jini.discovery">AbstractLookupDiscovery</a></dd>
	</dl>
	<hr>
	<br>
	<pre>private class <span class="typeNameLabel">AbstractLookupDiscovery.UnicastDiscoveryTask</span>
	extends <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
	implements <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></pre>
	<div class="block">Task which retrieves elements from the set of pendingDiscoveries and
	performs the appropriate processing based on the object type of
	the element.
	<p>
	Each element of the set of pendingDiscoveries is one of the following
	object types: Socket, LookupLocator, CheckGroupsMarker,
	or CheckReachabilityMarker.
	<p>
	When the element to process is a Socket, the element was a result
	of a multicast request/response exchange (see the Requestor and
	ResponseListener Thread classes). In this case, this task completes
	the discovery of the associated lookup service by performing the
	final stage of unicast discovery, ultimately resulting in a discovered
	event being sent to all registered listeners.
	<p>
	When the element to process is a LookupLocator, the element was a
	result of a multicast announcement received from a lookup service -
	belonging to at least one group of interest - which has not already
	been discovered. In this case, this task also completes the discovery
	of the lookup service referenced in the announcement by performing the
	final stage of unicast discovery, ultimately resulting in a discovered
	event being sent to all registered listeners.
	<p>
	When the element to process is a CheckGroupsMarker, the
	element was a result of a multicast announcement received from an
	already-discovered lookup service whose member groups have changed
	in some way. In this case, this task determines how those member
	groups have changed and, based on how they have changed, whether
	(or not) to send a discarded event or a changed event to the
	appropriate registered listeners.
	<p>
	When the element to process is a CheckReachabilityMarker, the
	element was a result of a determination that the multicast
	announcements from an already-discovered lookup service have
	stopped being received (see the AnnouncementTimerThread class).
	In this case, this task determines if the affected lookup service
	is still available ("reachable"). If this task cannot communicate
	with the lookup service, a discarded event is queued to be sent
	to all registered listeners.
	<p>
	Rather than performing unicast discovery synchronously, after multicast
	discovery has occurred in either the AnnouncementListener thread
	(the multicast announcement protocol) or the ResponseListener thread
	(the multicast request protocol), the unicast discovery processing
	that is required to complete the discovery process is queued for
	asynchronous execution in this task. Unicast discovery is performed
	asynchronously because unicast discovery can take quite a while to
	fail if a lookup service "disappears" (because the network or the
	lookup service itself has crashed) between the time a multicast
	announcement or response indicates the existence of a lookup service
	eligible for unicast discovery, and the time unicast discovery
	actually starts. If unicast discovery is performed synchronously
	in the threads that implement the multicast announcement and multicast
	request protocols, other multicast announcements (as well as other
	unicast discoveries) will be missed whenever a lookup service
	disappears prior to the commencement of the unicast discovery stage.</div>
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	<th class="colFirst" scope="col">Modifier and Type</th>
	<th class="colLast" scope="col">Field and Description</th>
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	<td class="colFirst"><code>private boolean</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#delayRun">delayRun</a></span></code> </td>
	</tr>
	<tr class="rowColor">
	<td class="colFirst"><code>private <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#req">req</a></span></code> </td>
	</tr>
	<tr class="altColor">
	<td class="colFirst"><code>private <a href="../../../org/apache/river/thread/WakeupManager.Ticket.html" title="class in org.apache.river.thread">WakeupManager.Ticket</a></code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#ticket">ticket</a></span></code> </td>
	</tr>
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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="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#UnicastDiscoveryTask-java.lang.Object-">UnicastDiscoveryTask</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> req)</code> </td>
	</tr>
	<tr class="rowColor">
	<td class="colOne"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#UnicastDiscoveryTask-java.lang.Object-boolean-">UnicastDiscoveryTask</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> req,
	boolean delayRun)</code> </td>
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	<td class="colFirst"><code>private void</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#doRun--">doRun</a></span>()</code> </td>
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	<tr id="i1" class="rowColor">
	<td class="colFirst"><code>void</code></td>
	<td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/discovery/AbstractLookupDiscovery.UnicastDiscoveryTask.html#run--">run</a></span>()</code>
	<div class="block">Restore the privileged context and run</div>
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	<h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
	<code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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	<a name="req">
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	<h4>req</h4>
	<pre>private final <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> req</pre>
	</li>
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	<a name="ticket">
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	<h4>ticket</h4>
	<pre>private <a href="../../../org/apache/river/thread/WakeupManager.Ticket.html" title="class in org.apache.river.thread">WakeupManager.Ticket</a> ticket</pre>
	</li>
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	<a name="delayRun">
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	<h4>delayRun</h4>
	<pre>private boolean delayRun</pre>
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	<h4>UnicastDiscoveryTask</h4>
	<pre>UnicastDiscoveryTask(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> req)</pre>
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	<h4>UnicastDiscoveryTask</h4>
	<pre>UnicastDiscoveryTask(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> req,
	boolean delayRun)</pre>
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	<h4>run</h4>
	<pre>public void run()</pre>
	<div class="block">Restore the privileged context and run</div>
	<dl>
	<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
	<dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true#run--" title="class or interface in java.lang">run</a></code> in interface <code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></code></dd>
	</dl>
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	<h4>doRun</h4>
	<pre>private void doRun()</pre>
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