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AbstractEventManager (OpenJPA 0.9.6-incubating API)
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org.apache.openjpa.lib.util</FONT>
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Class AbstractEventManager</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.openjpa.lib.util.AbstractEventManager</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></DD>
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<DT><PRE>public abstract class <B>AbstractEventManager</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></DL>
</PRE>
<P>
Base event manager that handles adding/removing listeners
and firing events. This class is reentrant-safe; listeners can be added
and removed by other listeners when they receive events. The changes will
not be visible until the event fire that initiated the recursive sequence
of calls completes, however.
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Abe White</DD>
</DL>
<HR>
<P>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#AbstractEventManager()">AbstractEventManager</A></B>()</CODE>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#addListener(java.lang.Object)">addListener</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Register an event listener.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#fireEvent(java.lang.Object)">fireEvent</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;event)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Fire the given event to all listeners.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected abstract &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#fireEvent(java.lang.Object, java.lang.Object)">fireEvent</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;event,
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implement this method to fire the given event to the given listener.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#getListeners()">getListeners</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return a read-only list of listeners.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#hasListener(java.lang.Object)">hasListener</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return whether the given instance is in the list of listeners.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#hasListeners()">hasListeners</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return true if there are any registered listeners.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#newListenerCollection()">newListenerCollection</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return a new container for listeners.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/apache/openjpa/lib/util/AbstractEventManager.html#removeListener(java.lang.Object)">removeListener</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Remove an event listener.</TD>
</TR>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH>
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<A NAME="AbstractEventManager()"><!-- --></A><H3>
AbstractEventManager</H3>
<PRE>
public <B>AbstractEventManager</B>()</PRE>
<DL>
</DL>
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<A NAME="addListener(java.lang.Object)"><!-- --></A><H3>
addListener</H3>
<PRE>
public void <B>addListener</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)</PRE>
<DL>
<DD>Register an event listener.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html#addListener(java.lang.Object)">addListener</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="removeListener(java.lang.Object)"><!-- --></A><H3>
removeListener</H3>
<PRE>
public boolean <B>removeListener</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)</PRE>
<DL>
<DD>Remove an event listener.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html#removeListener(java.lang.Object)">removeListener</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="hasListener(java.lang.Object)"><!-- --></A><H3>
hasListener</H3>
<PRE>
public boolean <B>hasListener</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)</PRE>
<DL>
<DD>Return whether the given instance is in the list of listeners.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html#hasListener(java.lang.Object)">hasListener</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="hasListeners()"><!-- --></A><H3>
hasListeners</H3>
<PRE>
public boolean <B>hasListeners</B>()</PRE>
<DL>
<DD>Return true if there are any registered listeners.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html#hasListeners()">hasListeners</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getListeners()"><!-- --></A><H3>
getListeners</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> <B>getListeners</B>()</PRE>
<DL>
<DD>Return a read-only list of listeners.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html#getListeners()">getListeners</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="fireEvent(java.lang.Object)"><!-- --></A><H3>
fireEvent</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A>[] <B>fireEvent</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;event)</PRE>
<DL>
<DD>Fire the given event to all listeners.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html#fireEvent(java.lang.Object)">fireEvent</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/openjpa/lib/util/EventManager.html" title="interface in org.apache.openjpa.lib.util">EventManager</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="fireEvent(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
fireEvent</H3>
<PRE>
protected abstract void <B>fireEvent</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;event,
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;listener)
throws <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></PRE>
<DL>
<DD>Implement this method to fire the given event to the given listener.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Exception.html" title="class or interface in java.lang">Exception</A></CODE></DL>
</DD>
</DL>
<HR>
<A NAME="newListenerCollection()"><!-- --></A><H3>
newListenerCollection</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> <B>newListenerCollection</B>()</PRE>
<DL>
<DD>Return a new container for listeners. Uses a linked list by default.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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