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| org.apache.openjpa.lib.util.concurrent</FONT> |
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| Class Utils</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.concurrent.Utils</B> |
| </PRE> |
| <HR> |
| <DL> |
| <DT><PRE>public final class <B>Utils</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></DL> |
| </PRE> |
| |
| <P> |
| This class groups together the functionality of java.util.concurrent that |
| cannot be fully and reliably implemented in backport, but for which some |
| form of emulation is possible. |
| Currently, this class contains methods related to nanosecond-precision |
| timing, particularly via the <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Utils.html#nanoTime()"><CODE>nanoTime()</CODE></A> method. To measure time |
| accurately, this method by default uses <code>java.sun.Perf</code> on |
| JDK1.4.2 and it falls back to <code>System.currentTimeMillis</code> |
| on earlier JDKs. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Version:</B></DT> |
| <DD>1.0</DD> |
| <DT><B>Author:</B></DT> |
| <DD>Dawid Kurzyniec</DD> |
| </DL> |
| <HR> |
| |
| <P> |
| |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static long</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Utils.html#awaitNanos(org.apache.openjpa.lib.util.concurrent.Condition, long)">awaitNanos</A></B>(<A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Condition.html" title="interface in org.apache.openjpa.lib.util.concurrent">Condition</A> cond, |
| long nanosTimeout)</CODE> |
| |
| <BR> |
| Causes the current thread to wait until it is signalled or interrupted, |
| or the specified waiting time elapses.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static <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>[]</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Utils.html#collectionToArray(java.util.Collection)">collectionToArray</A></B>(<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> c)</CODE> |
| |
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| </TD> |
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| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>static <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>[]</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Utils.html#collectionToArray(java.util.Collection, java.lang.Object[])">collectionToArray</A></B>(<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> c, |
| <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>[] a)</CODE> |
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| <CODE>static long</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Utils.html#nanoTime()">nanoTime</A></B>()</CODE> |
| |
| <BR> |
| Returns the current value of the most precise available system timer, |
| in nanoseconds.</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="nanoTime()"><!-- --></A><H3> |
| nanoTime</H3> |
| <PRE> |
| public static long <B>nanoTime</B>()</PRE> |
| <DL> |
| <DD>Returns the current value of the most precise available system timer, |
| in nanoseconds. This method can only be used to measure elapsed time and |
| is not related to any other notion of system or wall-clock time. The |
| value returned represents nanoseconds since some fixed but arbitrary |
| time(perhaps in the future, so values may be negative). This method |
| provides nanosecond precision, but not necessarily nanosecond accuracy. |
| No guarantees are made about how frequently values change. Differences |
| in successive calls that span greater than approximately 292 years |
| (2^63 nanoseconds) will not accurately compute elapsed time due to |
| numerical overflow. |
| |
| <em>Implementation note:</em>By default, this method uses |
| <code>sun.misc.Perf</code> on Java 1.4.2, and falls back to |
| System.currentTimeMillis() emulation on earlier JDKs. Custom |
| timer can be provided via the system property |
| <code>edu.emory.mathcs.backport.java.util.concurrent.NanoTimerProvider</code>. |
| The value of the property should name a class implementing |
| <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/NanoTimer.html" title="interface in org.apache.openjpa.lib.util.concurrent"><CODE>NanoTimer</CODE></A> interface. |
| Note: on JDK 1.4.2, <code>sun.misc.Perf</code> timer seems to have |
| resolution of the order of 1 microsecond, measured on Linux. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>The current value of the system timer, in nanoseconds.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="awaitNanos(org.apache.openjpa.lib.util.concurrent.Condition, long)"><!-- --></A><H3> |
| awaitNanos</H3> |
| <PRE> |
| public static long <B>awaitNanos</B>(<A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Condition.html" title="interface in org.apache.openjpa.lib.util.concurrent">Condition</A> cond, |
| long nanosTimeout) |
| throws <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/InterruptedException.html" title="class or interface in java.lang">InterruptedException</A></PRE> |
| <DL> |
| <DD>Causes the current thread to wait until it is signalled or interrupted, |
| or the specified waiting time elapses. This method originally appears |
| in the <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Condition.html" title="interface in org.apache.openjpa.lib.util.concurrent"><CODE>Condition</CODE></A> interface, but it was moved to here since it |
| can only be emulated, with very little accuracy guarantees: the |
| efficient implementation requires accurate nanosecond timer and native |
| support for nanosecond-precision wait queues, which are not usually |
| present in JVMs prior to 1.5. Loss of precision may cause total waiting |
| times to be systematically shorter than specified when re-waits occur. |
| The lock associated with this condition is atomically |
| released and the current thread becomes disabled for thread scheduling |
| purposes and lies dormant until <em>one</em> of five things happens: |
| <ul> |
| <li>Some other thread invokes the <CODE>edu.emory.mathcs.backport.java.util.concurrent.locks.Condition#signal</CODE> |
| method for this |
| <tt>Condition</tt> and the current thread happens to be chosen as the |
| thread to be awakened; or |
| <li>Some other thread invokes the <CODE>edu.emory.mathcs.backport.java.util.concurrent.locks.Condition#signalAll</CODE> |
| method for this |
| <tt>Condition</tt>; or |
| <li>Some other thread <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html#interrupt()" title="class or interface in java.lang"><CODE>interrupts</CODE></A> the current |
| thread, and interruption of thread suspension is supported; or |
| <li>The specified waiting time elapses; or |
| <li>A "<em>spurious wakeup</em>" occurs. |
| </ul> In all cases, before this method can return the current thread must |
| re-acquire the lock associated with this condition. When the |
| thread returns it is <em>guaranteed</em> to hold this lock. |
| If the current thread: |
| <ul> |
| <li>has its interrupted status set on entry to this method; or |
| <li>is <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Thread.html#interrupt()" title="class or interface in java.lang"><CODE>interrupted</CODE></A> while waiting |
| and interruption of thread suspension is supported, |
| </ul> |
| then <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/InterruptedException.html" title="class or interface in java.lang"><CODE>InterruptedException</CODE></A> is thrown and the current thread's |
| interrupted status is cleared. It is not specified, in the first |
| case, whether or not the test for interruption occurs before the lock |
| is released. The method returns an estimate of the number of nanoseconds |
| remaining to wait given the supplied <tt>nanosTimeout</tt> |
| value upon return, or a value less than or equal to zero if it |
| timed out. Accuracy of this estimate is directly dependent on the |
| accuracy of <A HREF="../../../../../../org/apache/openjpa/lib/util/concurrent/Utils.html#nanoTime()"><CODE>nanoTime()</CODE></A>. This value can be used to determine |
| whether and how long to re-wait in cases where the wait returns but an |
| awaited condition still does not hold. Typical uses of this method take |
| the following form: |
| |
| <pre> synchronized boolean aMethod(long timeout, TimeUnit unit) { |
| long nanosTimeout = unit.toNanos(timeout); |
| while (!conditionBeingWaitedFor) { if (nanosTimeout > 0) |
| nanosTimeout = theCondition.awaitNanos(nanosTimeout); else return false; |
| } // ... } |
| </pre> |
| |
| <b>Implementation Considerations</b> |
| The current thread is assumed to hold the lock associated with this |
| <tt>Condition</tt> when this method is called. |
| It is up to the implementation to determine if this is |
| the case and if not, how to respond. Typically, an exception will be |
| thrown(such as <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/IllegalMonitorStateException.html" title="class or interface in java.lang"><CODE>IllegalMonitorStateException</CODE></A>) and the |
| implementation must document that fact. |
| A condition implementation can favor responding to an interrupt over |
| normal method return in response to a signal, or over indicating the |
| elapse of the specified waiting time. In either case the implementation |
| must ensure that the signal is redirected to another waiting thread, if |
| there is one. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>cond</CODE> - the condition to wait for<DD><CODE>nanosTimeout</CODE> - the maximum time to wait, in nanoseconds |
| <DT><B>Returns:</B><DD>A value less than or equal to zero if the wait has |
| timed out; otherwise an estimate, that |
| is strictly less than the <tt>nanosTimeout</tt> argument, |
| of the time still remaining when this method returned. |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/InterruptedException.html" title="class or interface in java.lang">InterruptedException</A></CODE> - if the current thread is interrupted(and |
| interruption of thread suspension is supported).</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="collectionToArray(java.util.Collection)"><!-- --></A><H3> |
| collectionToArray</H3> |
| <PRE> |
| public static <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>collectionToArray</B>(<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> c)</PRE> |
| <DL> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="collectionToArray(java.util.Collection, java.lang.Object[])"><!-- --></A><H3> |
| collectionToArray</H3> |
| <PRE> |
| public static <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>collectionToArray</B>(<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> c, |
| <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>[] a)</PRE> |
| <DL> |
| <DD><DL> |
| </DL> |
| </DD> |
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