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TimerThread (jTDS API)
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net.sourceforge.jtds.util</FONT>
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Class TimerThread</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by">java.lang.Thread
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>net.sourceforge.jtds.util.TimerThread</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.lang.Runnable</DD>
</DL>
<HR>
<DL>
<DT>public class <B>TimerThread</B><DT>extends java.lang.Thread</DL>
<P>
Simple timer class used to implement login and query timeouts.
<p/>
This thread runs as a Daemon thread to ensure that the java VM will exit
correctly when normal execution is complete.
<p/>
It provides both a singleton implementation and a default constructor for
the case when more than one timer thread is desired.
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Id: TimerThread.java,v 1.5.2.2 2009/10/17 13:21:27 ickzon Exp $</DD>
<DT><B>Author:</B></DT>
<DD>Alin Sinpalean, Mike Hutchinson</DD>
</DL>
<HR>
<P>
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<CODE>static interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.TimerListener.html" title="interface in net.sourceforge.jtds.util">TimerThread.TimerListener</A></B></CODE>
<BR>
Interface to be implemented by classes that request timer services.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private static class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.TimerRequest.html" title="class in net.sourceforge.jtds.util">TimerThread.TimerRequest</A></B></CODE>
<BR>
Internal class associating a login or query timeout value with a target
<code>TimerListener</code>.</TD>
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<CODE>private static <A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html" title="class in net.sourceforge.jtds.util">TimerThread</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#instance">instance</A></B></CODE>
<BR>
Singleton instance.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#nextTimeout">nextTimeout</A></B></CODE>
<BR>
Time when the first request time out should occur.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private java.util.LinkedList</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#timerList">timerList</A></B></CODE>
<BR>
List of <code>TimerRequest</code>s to execute, ordered by time.</TD>
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<TD><CODE>MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY</CODE></TD>
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<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#TimerThread()">TimerThread</A></B>()</CODE>
<BR>
Construct a new <code>TimerThread</code> instance.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#cancelTimer(java.lang.Object)">cancelTimer</A></B>(java.lang.Object handle)</CODE>
<BR>
Remove a redundant timer before it expires.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static <A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html" title="class in net.sourceforge.jtds.util">TimerThread</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#getInstance()">getInstance</A></B>()</CODE>
<BR>
Singleton getter.</TD>
</TR>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#hasExpired(java.lang.Object)">hasExpired</A></B>(java.lang.Object handle)</CODE>
<BR>
Check whether a timer has expired.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#run()">run</A></B>()</CODE>
<BR>
Execute the <code>TimerThread</code> main loop.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#setTimer(int, net.sourceforge.jtds.util.TimerThread.TimerListener)">setTimer</A></B>(int timeout,
<A HREF="../../../../net/sourceforge/jtds/util/TimerThread.TimerListener.html" title="interface in net.sourceforge.jtds.util">TimerThread.TimerListener</A> l)</CODE>
<BR>
Add a timer request to the queue.
</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#stopTimer()">stopTimer</A></B>()</CODE>
<BR>
Completely stops the timer and its underlying Java thread, discarding all
pending timeouts. </TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#updateNextTimeout()">updateNextTimeout</A></B>()</CODE>
<BR>
Internal method that updates the value of <A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#nextTimeout"><CODE>nextTimeout</CODE></A>.</TD>
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<TD><B>Methods inherited from class java.lang.Thread</B></TD>
</TR>
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<TD><CODE>activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getContextClassLoader, getName, getPriority, getThreadGroup, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setName, setPriority, sleep, sleep, start, stop, stop, suspend, toString, yield</CODE></TD>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</CODE></TD>
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<A NAME="instance"><!-- --></A><H3>
instance</H3>
<PRE>
private static <A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html" title="class in net.sourceforge.jtds.util">TimerThread</A> <B>instance</B></PRE>
<DL>
<DD>Singleton instance.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="timerList"><!-- --></A><H3>
timerList</H3>
<PRE>
private final java.util.LinkedList <B>timerList</B></PRE>
<DL>
<DD>List of <code>TimerRequest</code>s to execute, ordered by time.
<P>
<DL>
</DL>
</DL>
<HR>
<A NAME="nextTimeout"><!-- --></A><H3>
nextTimeout</H3>
<PRE>
private long <B>nextTimeout</B></PRE>
<DL>
<DD>Time when the first request time out should occur.
<P>
<DL>
</DL>
</DL>
<!-- ========= CONSTRUCTOR DETAIL ======== -->
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<A NAME="TimerThread()"><!-- --></A><H3>
TimerThread</H3>
<PRE>
public <B>TimerThread</B>()</PRE>
<DL>
<DD>Construct a new <code>TimerThread</code> instance.
<P>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="getInstance()"><!-- --></A><H3>
getInstance</H3>
<PRE>
public static <A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html" title="class in net.sourceforge.jtds.util">TimerThread</A> <B>getInstance</B>()</PRE>
<DL>
<DD>Singleton getter.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="run()"><!-- --></A><H3>
run</H3>
<PRE>
public void <B>run</B>()</PRE>
<DL>
<DD>Execute the <code>TimerThread</code> main loop.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="setTimer(int, net.sourceforge.jtds.util.TimerThread.TimerListener)"><!-- --></A><H3>
setTimer</H3>
<PRE>
public java.lang.Object <B>setTimer</B>(int timeout,
<A HREF="../../../../net/sourceforge/jtds/util/TimerThread.TimerListener.html" title="interface in net.sourceforge.jtds.util">TimerThread.TimerListener</A> l)</PRE>
<DL>
<DD>Add a timer request to the queue.
<p/>
The queue is ordered by time so that the head of the list is always the
first timer to expire.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>timeout</CODE> - the interval in milliseconds after which the timer will
expire<DD><CODE>l</CODE> - <code>TimerListener</code> to be notified on timeout
<DT><B>Returns:</B><DD>a handle to the timer request, that can later be used with
<code>cancelTimer</code></DL>
</DD>
</DL>
<HR>
<A NAME="cancelTimer(java.lang.Object)"><!-- --></A><H3>
cancelTimer</H3>
<PRE>
public boolean <B>cancelTimer</B>(java.lang.Object handle)</PRE>
<DL>
<DD>Remove a redundant timer before it expires.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>handle</CODE> - handle to the request to be removed from the queue (a
<code>TimerRequest</code> instance)
<DT><B>Returns:</B><DD><code>true</code> if timer had not expired</DL>
</DD>
</DL>
<HR>
<A NAME="stopTimer()"><!-- --></A><H3>
stopTimer</H3>
<PRE>
public void <B>stopTimer</B>()</PRE>
<DL>
<DD>Completely stops the timer and its underlying Java thread, discarding all
pending timeouts. Any subsequent invocation of <A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#getInstance()"><CODE>getInstance()</CODE></A>
will restart the timer.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="hasExpired(java.lang.Object)"><!-- --></A><H3>
hasExpired</H3>
<PRE>
public boolean <B>hasExpired</B>(java.lang.Object handle)</PRE>
<DL>
<DD>Check whether a timer has expired.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>handle</CODE> - handle to the request to be checked for expiry (a
<code>TimerRequest</code> instance)
<DT><B>Returns:</B><DD><code>true</code> if timer has expired</DL>
</DD>
</DL>
<HR>
<A NAME="updateNextTimeout()"><!-- --></A><H3>
updateNextTimeout</H3>
<PRE>
private void <B>updateNextTimeout</B>()</PRE>
<DL>
<DD>Internal method that updates the value of <A HREF="../../../../net/sourceforge/jtds/util/TimerThread.html#nextTimeout"><CODE>nextTimeout</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
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