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Semaphore (jTDS API)
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net.sourceforge.jtds.jdbc</FONT>
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Class Semaphore</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>net.sourceforge.jtds.jdbc.Semaphore</B>
</PRE>
<HR>
<DL>
<DT>public class <B>Semaphore</B><DT>extends java.lang.Object</DL>
<P>
Simple semaphore class used to serialize access requests over the network
connection.
<p/>
Based on the code originally written by Doug Lea. Once JDK 1.5 is the
standard this class can be replaced by the
<code>java.util.concurrent.Sempahore</code> class.
<P>
<P>
<DL>
<DT><B>Version:</B></DT>
<DD>$Id: Semaphore.java,v 1.1 2004/12/20 15:51:17 alin_sinpalean Exp $</DD>
<DT><B>Author:</B></DT>
<DD>Mike Hutchinson</DD>
</DL>
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<CODE>protected long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/jdbc/Semaphore.html#permits">permits</A></B></CODE>
<BR>
Current number of available permits.</TD>
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<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/jdbc/Semaphore.html#Semaphore(long)">Semaphore</A></B>(long initialPermits)</CODE>
<BR>
Create a Semaphore with the given initial number of permits. </TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/jdbc/Semaphore.html#acquire()">acquire</A></B>()</CODE>
<BR>
Wait until a permit is available, and take one.</TD>
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<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/jdbc/Semaphore.html#attempt(long)">attempt</A></B>(long msecs)</CODE>
<BR>
Wait at most msecs millisconds for a permit.</TD>
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<CODE> long</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/jdbc/Semaphore.html#permits()">permits</A></B>()</CODE>
<BR>
Return the current number of available permits. </TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/jdbc/Semaphore.html#release()">release</A></B>()</CODE>
<BR>
Release a permit.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../net/sourceforge/jtds/jdbc/Semaphore.html#release(long)">release</A></B>(long n)</CODE>
<BR>
Release N permits. </TD>
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<A NAME="permits"><!-- --></A><H3>
permits</H3>
<PRE>
protected long <B>permits</B></PRE>
<DL>
<DD>Current number of available permits.
<P>
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<A NAME="Semaphore(long)"><!-- --></A><H3>
Semaphore</H3>
<PRE>
public <B>Semaphore</B>(long initialPermits)</PRE>
<DL>
<DD>Create a Semaphore with the given initial number of permits. Using a
seed of one makes the semaphore act as a mutual exclusion lock. Negative
seeds are also allowed, in which case no acquires will proceed until the
number of releases has pushed the number of permits past 0.
<P>
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<A NAME="acquire()"><!-- --></A><H3>
acquire</H3>
<PRE>
public void <B>acquire</B>()
throws java.lang.InterruptedException</PRE>
<DL>
<DD>Wait until a permit is available, and take one.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.InterruptedException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="attempt(long)"><!-- --></A><H3>
attempt</H3>
<PRE>
public boolean <B>attempt</B>(long msecs)
throws java.lang.InterruptedException</PRE>
<DL>
<DD>Wait at most msecs millisconds for a permit.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.InterruptedException</CODE></DL>
</DD>
</DL>
<HR>
<A NAME="release()"><!-- --></A><H3>
release</H3>
<PRE>
public void <B>release</B>()</PRE>
<DL>
<DD>Release a permit.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="release(long)"><!-- --></A><H3>
release</H3>
<PRE>
public void <B>release</B>(long n)</PRE>
<DL>
<DD>Release N permits. <code>release(n)</code> is equivalent in effect to:
<pre>
for (int i = 0; i < n; ++i) release();
</pre>
<p/>
But may be more efficient in some semaphore implementations.
<P>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if n is negative</DL>
</DD>
</DL>
<HR>
<A NAME="permits()"><!-- --></A><H3>
permits</H3>
<PRE>
public long <B>permits</B>()</PRE>
<DL>
<DD>Return the current number of available permits. Returns an accurate, but
possibly unstable value, that may change immediately after returning.
<P>
<DD><DL>
</DL>
</DD>
</DL>
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