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| <div class="subTitle">net.jini.lookup</div> | |
| <h2 title="Class ServiceDiscoveryEvent" class="title">Class ServiceDiscoveryEvent</h2> | |
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| <ul class="inheritance"> | |
| <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> | |
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| <li>net.jini.lookup.ServiceDiscoveryEvent</li> | |
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| <pre>public class <span class="typeNameLabel">ServiceDiscoveryEvent</span> | |
| extends <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></pre> | |
| <div class="block">The <code>ServiceDiscoveryEvent</code> class encapsulates the | |
| service discovery information made available by the event mechanism | |
| of the <a href="../../../net/jini/lookup/LookupCache.html" title="interface in net.jini.lookup"><code>LookupCache</code></a>. All listeners | |
| that an entity has registered with the cache's event mechanism will | |
| receive an event of type <code>ServiceDiscoveryEvent</code> upon | |
| the discovery, removal, or modification of one of the cache's services. | |
| This class is used by | |
| <a href="../../../net/jini/lookup/ServiceDiscoveryManager.html" title="class in net.jini.lookup"><code>ServiceDiscoveryManager</code></a>.</div> | |
| <dl> | |
| <dt><span class="simpleTagLabel">Author:</span></dt> | |
| <dd>Sun Microsystems, Inc.</dd> | |
| <dt><span class="seeLabel">See Also:</span></dt> | |
| <dd><a href="../../../net/jini/lookup/ServiceDiscoveryManager.html" title="class in net.jini.lookup"><code>ServiceDiscoveryManager</code></a>, | |
| <a href="../../../serialized-form.html#net.jini.lookup.ServiceDiscoveryEvent">Serialized Form</a></dd> | |
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| <caption><span>Fields</span><span class="tabEnd"> </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 <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#postEventItem">postEventItem</a></span></code> | |
| <div class="block">Represents the state of the service after the event.</div> | |
| </td> | |
| </tr> | |
| <tr class="rowColor"> | |
| <td class="colFirst"><code>private <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#preEventItem">preEventItem</a></span></code> | |
| <div class="block">Represents the state of the service prior to the event.</div> | |
| </td> | |
| </tr> | |
| <tr class="altColor"> | |
| <td class="colFirst"><code>private static long</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#serialVersionUID">serialVersionUID</a></span></code> </td> | |
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| <code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/EventObject.html?is-external=true#source" title="class or interface in java.util">source</a></code></li> | |
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| <th class="colFirst" scope="col">Modifier</th> | |
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| <tr class="altColor"> | |
| <td class="colFirst"><code> </code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#ServiceDiscoveryEvent-java.lang.Object-net.jini.core.lookup.ServiceItem-net.jini.core.lookup.ServiceItem-">ServiceDiscoveryEvent</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> source, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> preEventItem, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> postEventItem)</code> | |
| <div class="block">The constructor of <code>ServiceDiscoveryEvent</code> takes | |
| three arguments: | |
| An instance of <code>Object</code> corresponding to the | |
| instance of <code>LookupCache</code> from which the given event | |
| originated | |
| A <code>ServiceItem</code> reference representing the state | |
| of the service (associated with the given event) prior to the | |
| occurrence of the event | |
| A <code>ServiceItem</code> reference representing the state | |
| of the service after the occurrence of the event | |
| If <code>null</code> is passed as the source parameter for the | |
| constructor, a <code>NullPointerException</code> will be thrown.</div> | |
| </td> | |
| </tr> | |
| <tr class="rowColor"> | |
| <td class="colFirst"><code>private </code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#ServiceDiscoveryEvent-java.lang.Object-net.jini.core.lookup.ServiceItem-net.jini.core.lookup.ServiceItem-boolean-">ServiceDiscoveryEvent</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> source, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> preEventItem, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> postEventItem, | |
| boolean check)</code> </td> | |
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| <tr> | |
| <th class="colFirst" scope="col">Modifier and Type</th> | |
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| </tr> | |
| <tr id="i0" class="altColor"> | |
| <td class="colFirst"><code><a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#getPostEventServiceItem--">getPostEventServiceItem</a></span>()</code> | |
| <div class="block">Returns an instance of a <code>ServiceItem</code> containing the | |
| service reference corresponding to the given event.</div> | |
| </td> | |
| </tr> | |
| <tr id="i1" class="rowColor"> | |
| <td class="colFirst"><code><a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a></code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#getPreEventServiceItem--">getPreEventServiceItem</a></span>()</code> | |
| <div class="block">Returns an instance of a <code>ServiceItem</code> containing the | |
| service reference corresponding to the given event.</div> | |
| </td> | |
| </tr> | |
| <tr id="i2" class="altColor"> | |
| <td class="colFirst"><code>private static boolean</code></td> | |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../net/jini/lookup/ServiceDiscoveryEvent.html#nullCheck-java.lang.Object-net.jini.core.lookup.ServiceItem-net.jini.core.lookup.ServiceItem-">nullCheck</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> source, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> preEventItem, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> postEventItem)</code> </td> | |
| </tr> | |
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| <h3>Methods inherited from class 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#getSource--" title="class or interface in java.util">getSource</a>, <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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| <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> | |
| </li> | |
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| </li> | |
| </ul> | |
| </div> | |
| <div class="details"> | |
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| <!-- ============ FIELD DETAIL =========== --> | |
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| </a> | |
| <h3>Field Detail</h3> | |
| <a name="serialVersionUID"> | |
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| </a> | |
| <ul class="blockList"> | |
| <li class="blockList"> | |
| <h4>serialVersionUID</h4> | |
| <pre>private static final long serialVersionUID</pre> | |
| <dl> | |
| <dt><span class="seeLabel">See Also:</span></dt> | |
| <dd><a href="../../../constant-values.html#net.jini.lookup.ServiceDiscoveryEvent.serialVersionUID">Constant Field Values</a></dd> | |
| </dl> | |
| </li> | |
| </ul> | |
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| </a> | |
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| <h4>preEventItem</h4> | |
| <pre>private final <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> preEventItem</pre> | |
| <div class="block">Represents the state of the service prior to the event.</div> | |
| </li> | |
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| <a name="postEventItem"> | |
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| </a> | |
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| <li class="blockList"> | |
| <h4>postEventItem</h4> | |
| <pre>private final <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> postEventItem</pre> | |
| <div class="block">Represents the state of the service after the event.</div> | |
| </li> | |
| </ul> | |
| </li> | |
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| </a> | |
| <h3>Constructor Detail</h3> | |
| <a name="ServiceDiscoveryEvent-java.lang.Object-net.jini.core.lookup.ServiceItem-net.jini.core.lookup.ServiceItem-"> | |
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| <h4>ServiceDiscoveryEvent</h4> | |
| <pre>public ServiceDiscoveryEvent(<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> source, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> preEventItem, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> postEventItem)</pre> | |
| <div class="block">The constructor of <code>ServiceDiscoveryEvent</code> takes | |
| three arguments: | |
| <li>An instance of <code>Object</code> corresponding to the | |
| instance of <code>LookupCache</code> from which the given event | |
| originated</li> | |
| <p> | |
| <li>A <code>ServiceItem</code> reference representing the state | |
| of the service (associated with the given event) prior to the | |
| occurrence of the event</li> | |
| <p> | |
| <li>A <code>ServiceItem</code> reference representing the state | |
| of the service after the occurrence of the event</li> | |
| <p> | |
| If <code>null</code> is passed as the source parameter for the | |
| constructor, a <code>NullPointerException</code> will be thrown. | |
| <p> | |
| Depending on the nature of the discovery event, a null reference | |
| may be passed as one or the other of the remaining parameters, but | |
| never both. If <code>null</code> is passed as both the | |
| <code>preEventItem </code>and the <code>postEventItem</code> | |
| parameters, a <code>NullPointerException</code> will be thrown. | |
| <p> | |
| Note that the constructor will not modify the contents of either | |
| <code>ServiceItem</code> argument. Doing so can result in | |
| unpredictable and undesirable effects on future processing by the | |
| <code>ServiceDiscoveryManager</code>. That is why the effects of any | |
| such modification to the contents of either input parameter are | |
| undefined.</div> | |
| <dl> | |
| <dt><span class="paramLabel">Parameters:</span></dt> | |
| <dd><code>source</code> - an instance of <code>Object</code> corresponding | |
| to the instance of <code>LookupCache</code> from | |
| which the given event originated.</dd> | |
| <dd><code>preEventItem</code> - a <code>ServiceItem</code> reference | |
| representing the state of the service (associated | |
| with the given event) prior to the occurrence of | |
| the event.</dd> | |
| <dd><code>postEventItem</code> - a <code>ServiceItem</code> reference | |
| representing the state of the service after the | |
| occurrence of the event.</dd> | |
| <dt><span class="throwsLabel">Throws:</span></dt> | |
| <dd><code><code>NullPointerException</code></code> - if <code>null</code> is | |
| passed as the source parameter for the constructor, | |
| or if <code>null</code> is passed as both the | |
| <code>preEventItem </code>and the | |
| <code>postEventItem</code> parameters.</dd> | |
| </dl> | |
| </li> | |
| </ul> | |
| <a name="ServiceDiscoveryEvent-java.lang.Object-net.jini.core.lookup.ServiceItem-net.jini.core.lookup.ServiceItem-boolean-"> | |
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| <h4>ServiceDiscoveryEvent</h4> | |
| <pre>private ServiceDiscoveryEvent(<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> source, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> preEventItem, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> postEventItem, | |
| boolean check)</pre> | |
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| <!-- ============ METHOD DETAIL ========== --> | |
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| <h3>Method Detail</h3> | |
| <a name="nullCheck-java.lang.Object-net.jini.core.lookup.ServiceItem-net.jini.core.lookup.ServiceItem-"> | |
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| <h4>nullCheck</h4> | |
| <pre>private static boolean nullCheck(<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> source, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> preEventItem, | |
| <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> postEventItem) | |
| throws <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></pre> | |
| <dl> | |
| <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></dd> | |
| </dl> | |
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| </ul> | |
| <a name="getPreEventServiceItem--"> | |
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| <h4>getPreEventServiceItem</h4> | |
| <pre>public <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> getPreEventServiceItem()</pre> | |
| <div class="block">Returns an instance of a <code>ServiceItem</code> containing the | |
| service reference corresponding to the given event. The service | |
| state reflected in the returned service item is the state of the | |
| service prior to the occurrence of the event. | |
| <p> | |
| If the event is a discovery event (as opposed to a removal or | |
| modification event), then this method will return <code>null</code> | |
| because the discovered service had no state in the cache prior to | |
| its discovery. | |
| <p> | |
| Because making a copy can be a very expensive process, this | |
| method does not return a copy of the service reference associated | |
| with the given event. Rather, it returns the appropriate service | |
| reference from the cache itself. Due to this cost, listeners that | |
| receive a <code>ServiceDiscoveryEvent</code> must not modify the | |
| contents of the object returned by this method; doing so could | |
| cause the state of the cache to become corrupted or inconsistent | |
| because the objects returned by this method are also members of | |
| the cache. This potential for corruption or inconsistency is why | |
| the effects of modifying the object returned by this accessor | |
| method are undefined.</div> | |
| <dl> | |
| <dt><span class="returnLabel">Returns:</span></dt> | |
| <dd>ServiceItem containing the service reference corresponding | |
| to the given event.</dd> | |
| </dl> | |
| </li> | |
| </ul> | |
| <a name="getPostEventServiceItem--"> | |
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| <h4>getPostEventServiceItem</h4> | |
| <pre>public <a href="../../../net/jini/core/lookup/ServiceItem.html" title="class in net.jini.core.lookup">ServiceItem</a> getPostEventServiceItem()</pre> | |
| <div class="block">Returns an instance of a <code>ServiceItem</code> containing the | |
| service reference corresponding to the given event. The service | |
| state reflected in the returned service item is the state of the | |
| service after the occurrence of the event. | |
| <p> | |
| If the event is a removal event, then this method will return | |
| <code>null</code> because the discovered service has no state in | |
| the cache after it is removed from the cache. | |
| <p> | |
| Because making a copy can be a very expensive process, this | |
| method does not return a copy of the service reference associated | |
| with the given event. Rather, it returns the appropriate service | |
| reference from the cache itself. Due to this cost, listeners that | |
| receive a <code>ServiceDiscoveryEvent</code> must not modify the | |
| contents of the object returned by this method; doing so could | |
| cause the state of the cache to become corrupted or inconsistent | |
| because the objects returned by this method are also members of | |
| the cache. This potential for corruption or inconsistency is why | |
| the effects of modifying the object returned by this accessor | |
| method are undefined.</div> | |
| <dl> | |
| <dt><span class="returnLabel">Returns:</span></dt> | |
| <dd>ServiceItem containing the service reference corresponding | |
| to the given event.</dd> | |
| </dl> | |
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