content/release-doc/current/internals/net/jini/space/AvailabilityEvent.html - river-site - Git at Google

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 <div class="subTitle">net.jini.space</div>
 <h2 title="Class AvailabilityEvent" class="title">Class AvailabilityEvent</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>
 <ul class="inheritance">
 <li><a href="http://docs.oracle.com/javase/6/docs/api/java/util/EventObject.html?is-external=true" title="class or interface in java.util">java.util.EventObject</a></li>
 <li>
 <ul class="inheritance">
 <li><a href="../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">net.jini.core.event.RemoteEvent</a></li>
 <li>
 <ul class="inheritance">
 <li>net.jini.space.AvailabilityEvent</li>
 </ul>
 </li>
 </ul>
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 <dt>All Implemented Interfaces:</dt>
 <dd><a href="http://docs.oracle.com/javase/6/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></dd>
 </dl>
 <dl>
 <dt>Direct Known Subclasses:</dt>
 <dd><a href="../../../org/apache/river/outrigger/OutriggerAvailabilityEvent.html" title="class in org.apache.river.outrigger">OutriggerAvailabilityEvent</a></dd>
 </dl>
 <hr>
 <br>
 <pre>public abstract class <span class="typeNameLabel">AvailabilityEvent</span>
 extends <a href="../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">RemoteEvent</a></pre>
 <div class="block">A <code>RemoteEvent</code> marking the transition of an
  <code>Entry</code> from <a href="../../../net/jini/space/JavaSpace05.html#registerForAvailabilityEvent-java.util.Collection-net.jini.core.transaction.Transaction-boolean-net.jini.core.event.RemoteEventListener-long-java.rmi.MarshalledObject-"><code><em>unavailable</em> to
  <em>available</em></code></a>.<p>

  Note, by the time the event is delivered, the
  <code>Entry</code> whose transition triggered this event may
  have transitioned to a state where it is no longer visible
  and/or available.<p></div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>2.1</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../net/jini/space/JavaSpace05.html" title="interface in net.jini.space"><code>JavaSpace05</code></a>,
 <a href="../../../serialized-form.html#net.jini.space.AvailabilityEvent">Serialized Form</a></dd>
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 <caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Field and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>private static long</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#serialVersionUID">serialVersionUID</a></span></code>&nbsp;</td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>private boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#visibilityTransition">visibilityTransition</a></span></code>
 <div class="block"><code>true</code> if this event signals a
  transition from invisible to visible as well
  as unavailable to available.</div>
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 <h3>Fields inherited from class&nbsp;net.jini.core.event.<a href="../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">RemoteEvent</a></h3>
 <code><a href="../../../net/jini/core/event/RemoteEvent.html#eventID">eventID</a>, <a href="../../../net/jini/core/event/RemoteEvent.html#handback">handback</a>, <a href="../../../net/jini/core/event/RemoteEvent.html#seqNum">seqNum</a>, <a href="../../../net/jini/core/event/RemoteEvent.html#source">source</a></code></li>
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 <th class="colFirst" scope="col">Modifier</th>
 <th class="colLast" scope="col">Constructor and Description</th>
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 <tr class="altColor">
 <td class="colFirst"><code>protected </code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#AvailabilityEvent-net.jini.space.JavaSpace-long-long-java.rmi.MarshalledObject-boolean-">AvailabilityEvent</a></span>(<a href="../../../net/jini/space/JavaSpace.html" title="interface in net.jini.space">JavaSpace</a>&nbsp;source,
                  long&nbsp;eventID,
                  long&nbsp;seqNum,
                  <a href="http://docs.oracle.com/javase/6/docs/api/java/rmi/MarshalledObject.html?is-external=true" title="class or interface in java.rmi">MarshalledObject</a>&nbsp;handback,
                  boolean&nbsp;visibilityTransition)</code>
 <div class="block">Create a new <code>AvailabilityEvent</code> instance.</div>
 </td>
 </tr>
 </table>
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 <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>abstract <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry">Entry</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#getEntry--">getEntry</a></span>()</code>
 <div class="block">Returns a copy of the <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry"><code>Entry</code></a> whose transition
  triggered this event.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>abstract <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry">Entry</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#getSnapshot--">getSnapshot</a></span>()</code>
 <div class="block">Returns a <em>snapshot</em> of the <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry"><code>Entry</code></a> whose
  transition triggered this event.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#isVisibilityTransition--">isVisibilityTransition</a></span>()</code>
 <div class="block">Returns <code>true</code> if the transition that triggered
  this event was a transition from <a href="../../../net/jini/space/JavaSpace05.html#registerForAvailabilityEvent-java.util.Collection-net.jini.core.transaction.Transaction-boolean-net.jini.core.event.RemoteEventListener-long-java.rmi.MarshalledObject-"><em>invisible to
  visible</em></a> as well as a transition from unavailable to
  available, and <code>false</code> otherwise.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#readObject-java.io.ObjectInputStream-">readObject</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/ObjectInputStream.html?is-external=true" title="class or interface in java.io">ObjectInputStream</a>&nbsp;in)</code>&nbsp;</td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>private void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/space/AvailabilityEvent.html#readObjectNoData--">readObjectNoData</a></span>()</code>&nbsp;</td>
 </tr>
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 <h3>Methods inherited from class&nbsp;net.jini.core.event.<a href="../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">RemoteEvent</a></h3>
 <code><a href="../../../net/jini/core/event/RemoteEvent.html#getID--">getID</a>, <a href="../../../net/jini/core/event/RemoteEvent.html#getRegistrationObject--">getRegistrationObject</a>, <a href="../../../net/jini/core/event/RemoteEvent.html#getSequenceNumber--">getSequenceNumber</a>, <a href="../../../net/jini/core/event/RemoteEvent.html#getSource--">getSource</a></code></li>
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 <h3>Methods inherited from class&nbsp;java.util.<a href="http://docs.oracle.com/javase/6/docs/api/java/util/EventObject.html?is-external=true" title="class or interface in java.util">EventObject</a></h3>
 <code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/EventObject.html?is-external=true#toString--" title="class or interface in java.util">toString</a></code></li>
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 <h3>Methods inherited from class&nbsp;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#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>
 </ul>
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 <h4>serialVersionUID</h4>
 <pre>private static final&nbsp;long serialVersionUID</pre>
 <dl>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../constant-values.html#net.jini.space.AvailabilityEvent.serialVersionUID">Constant Field Values</a></dd>
 </dl>
 </li>
 </ul>
 <a name="visibilityTransition">
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 <h4>visibilityTransition</h4>
 <pre>private final&nbsp;boolean visibilityTransition</pre>
 <div class="block"><code>true</code> if this event signals a
  transition from invisible to visible as well
  as unavailable to available.</div>
 </li>
 </ul>
 </li>
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 <h3>Constructor Detail</h3>
 <a name="AvailabilityEvent-net.jini.space.JavaSpace-long-long-java.rmi.MarshalledObject-boolean-">
 <!--   -->
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 <h4>AvailabilityEvent</h4>
 <pre>protected&nbsp;AvailabilityEvent(<a href="../../../net/jini/space/JavaSpace.html" title="interface in net.jini.space">JavaSpace</a>&nbsp;source,
                             long&nbsp;eventID,
                             long&nbsp;seqNum,
                             <a href="http://docs.oracle.com/javase/6/docs/api/java/rmi/MarshalledObject.html?is-external=true" title="class or interface in java.rmi">MarshalledObject</a>&nbsp;handback,
                             boolean&nbsp;visibilityTransition)</pre>
 <div class="block">Create a new <code>AvailabilityEvent</code> instance.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>source</code> - the event source</dd>
 <dd><code>eventID</code> - the event identifier</dd>
 <dd><code>seqNum</code> - the event sequence number</dd>
 <dd><code>handback</code> - the handback object</dd>
 <dd><code>visibilityTransition</code> - <code>true</code> if this event
                   must also signal a transition from
                   invisible to visible</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if <code>source</code> is
         <code>null</code></dd>
 </dl>
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 <a name="readObject-java.io.ObjectInputStream-">
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 <h4>readObject</h4>
 <pre>private&nbsp;void&nbsp;readObject(<a href="http://docs.oracle.com/javase/6/docs/api/java/io/ObjectInputStream.html?is-external=true" title="class or interface in java.io">ObjectInputStream</a>&nbsp;in)
                  throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
                         <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></pre>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/InvalidObjectException.html?is-external=true" title="class or interface in java.io">InvalidObjectException</a></code> - if <a href="../../../net/jini/core/event/RemoteEvent.html#source"><code>RemoteEvent.source</code></a> is <code>null</code>
  or is not a <a href="../../../net/jini/space/JavaSpace.html" title="interface in net.jini.space"><code>JavaSpace</code></a></dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></code></dd>
 </dl>
 </li>
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 <h4>readObjectNoData</h4>
 <pre>private&nbsp;void&nbsp;readObjectNoData()
                        throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/InvalidObjectException.html?is-external=true" title="class or interface in java.io">InvalidObjectException</a></pre>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/InvalidObjectException.html?is-external=true" title="class or interface in java.io">InvalidObjectException</a></code> - if called</dd>
 </dl>
 </li>
 </ul>
 <a name="getEntry--">
 <!--   -->
 </a>
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 <h4>getEntry</h4>
 <pre>public abstract&nbsp;<a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry">Entry</a>&nbsp;getEntry()
                         throws <a href="../../../net/jini/core/entry/UnusableEntryException.html" title="class in net.jini.core.entry">UnusableEntryException</a></pre>
 <div class="block">Returns a copy of the <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry"><code>Entry</code></a> whose transition
  triggered this event. The returned <code>Entry</code> must
  be unmarshalled in accordance with the <a
  href=http://www.jini.org/standards/index.html>Jini
  Entry Specification</a>.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>a copy of the <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry"><code>Entry</code></a> whose transition
          triggered this event</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="../../../net/jini/core/entry/UnusableEntryException.html" title="class in net.jini.core.entry">UnusableEntryException</a></code> - if the <code>Entry</code>
          can't be unmarshalled in the client. The next call
          must re-attempt unmarshalling the
          <code>Entry</code></dd>
 </dl>
 </li>
 </ul>
 <a name="getSnapshot--">
 <!--   -->
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 <h4>getSnapshot</h4>
 <pre>public abstract&nbsp;<a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry">Entry</a>&nbsp;getSnapshot()</pre>
 <div class="block">Returns a <em>snapshot</em> of the <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry"><code>Entry</code></a> whose
  transition triggered this event. Snapshots are defined in
  section JS.2.6 of the <a
  href=http://www.jini.org/standards/index.html>
  JavaSpaces Service Specification</a> and are an
  alternative representation of a given <code>Entry</code>
  produced by a particular space for use with that same
  space. Passing a snapshot to a space is generally more
  efficient than passing the original <code>Entry</code>.<p>

  Any snapshot returned by this method will meet the same
  contract as the object returned by passing the result of
  <a href="../../../net/jini/space/AvailabilityEvent.html#getEntry--"><code>getEntry</code></a> to <a href="../../../net/jini/space/JavaSpace.html#snapshot-net.jini.core.entry.Entry-"><code>JavaSpace.snapshot</code></a>.<p>

  Generally there is a cost associated with calling the
  <code>JavaSpace.snapshot</code> method and thus creating a
  snapshot using that method is usually only worthwhile if
  the resulting snapshot is used more than once. The cost of
  invoking this method should be low and should be worthwhile
  even if the resulting snapshot is used only once. <p></div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>a <em>snapshot</em> of the <a href="../../../net/jini/core/entry/Entry.html" title="interface in net.jini.core.entry"><code>Entry</code></a> whose
          transition triggered this event</dd>
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 <h4>isVisibilityTransition</h4>
 <pre>public&nbsp;boolean&nbsp;isVisibilityTransition()</pre>
 <div class="block">Returns <code>true</code> if the transition that triggered
  this event was a transition from <a href="../../../net/jini/space/JavaSpace05.html#registerForAvailabilityEvent-java.util.Collection-net.jini.core.transaction.Transaction-boolean-net.jini.core.event.RemoteEventListener-long-java.rmi.MarshalledObject-"><em>invisible to
  visible</em></a> as well as a transition from unavailable to
  available, and <code>false</code> otherwise. <p></div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd><code>true</code> if the transition that triggered
  this event was a transition from invisible to visible as
  well as a transition from unavailable to available, and
  <code>false</code> otherwise</dd>
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