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| com.google.common.util.concurrent</FONT> |
| <BR> |
| Class AbstractFuture<V></H2> |
| <PRE> |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
| <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>com.google.common.util.concurrent.AbstractFuture<V></B> |
| </PRE> |
| <DL> |
| <DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</A><V></DD> |
| </DL> |
| <DL> |
| <DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../../com/google/common/util/concurrent/AbstractListenableFuture.html" title="class in com.google.common.util.concurrent">AbstractListenableFuture</A></DD> |
| </DL> |
| <HR> |
| <DL> |
| <DT><PRE>public abstract class <B>AbstractFuture<V></B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</A><V></DL> |
| </PRE> |
| |
| <P> |
| <p>An abstract implementation of the <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent"><CODE>Future</CODE></A> interface. This class |
| is an abstraction of <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/FutureTask.html?is-external=true" title="class or interface in java.util.concurrent"><CODE>FutureTask</CODE></A> to support use |
| for tasks other than <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang"><CODE>Runnable</CODE></A>s. It uses an |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/locks/AbstractQueuedSynchronizer.html?is-external=true" title="class or interface in java.util.concurrent.locks"><CODE>AbstractQueuedSynchronizer</CODE></A> to deal with concurrency issues and |
| guarantee thread safety. It could be used as a base class to |
| <code>FutureTask</code>, or any other implementor of the <code>Future</code> interface. |
| |
| <p>This class implements all methods in <code>Future</code>. Subclasses should |
| provide a way to set the result of the computation through the protected |
| methods <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#set(V)"><CODE>set(Object)</CODE></A>, <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#setException(java.lang.Throwable)"><CODE>setException(Throwable)</CODE></A>, or |
| <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#cancel()"><CODE>cancel()</CODE></A>. If subclasses want to implement cancellation they can |
| override the <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#cancel(boolean)"><CODE>cancel(boolean)</CODE></A> method with a real implementation, the |
| default implementation doesn't support cancellation. |
| |
| <p>The state changing methods all return a boolean indicating success or |
| failure in changing the future's state. Valid states are running, |
| completed, failed, or cancelled. Because this class does not implement |
| cancellation it is left to the subclass to distinguish between created |
| and running tasks. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Since:</B></DT> |
| <DD>2009.09.15 <b>tentative</b></DD> |
| <DT><B>Author:</B></DT> |
| <DD>Sven Mawson</DD> |
| </DL> |
| <HR> |
| |
| <P> |
| |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| |
| <A NAME="constructor_summary"><!-- --></A> |
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| <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
| <B>Constructor Summary</B></FONT></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#AbstractFuture()">AbstractFuture</A></B>()</CODE> |
| |
| <BR> |
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| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>protected boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#cancel()">cancel</A></B>()</CODE> |
| |
| <BR> |
| Subclasses should invoke this method to mark the future as cancelled.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#cancel(boolean)">cancel</A></B>(boolean mayInterruptIfRunning)</CODE> |
| |
| <BR> |
| </TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>protected void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#done()">done</A></B>()</CODE> |
| |
| <BR> |
| </TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#get()">get</A></B>()</CODE> |
| |
| <BR> |
| </TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#get(long, java.util.concurrent.TimeUnit)">get</A></B>(long timeout, |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</A> unit)</CODE> |
| |
| <BR> |
| </TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#isCancelled()">isCancelled</A></B>()</CODE> |
| |
| <BR> |
| </TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#isDone()">isDone</A></B>()</CODE> |
| |
| <BR> |
| </TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>protected boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#set(V)">set</A></B>(<A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A> value)</CODE> |
| |
| <BR> |
| Subclasses should invoke this method to set the result of the computation |
| to <code>value</code>.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE>protected boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#setException(java.lang.Throwable)">setException</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</A> throwable)</CODE> |
| |
| <BR> |
| Subclasses should invoke this method to set the result of the computation |
| to an error, <code>throwable</code>.</TD> |
| </TR> |
| </TABLE> |
| <A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> |
| <TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></B></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><A HREF="http://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.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://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.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://java.sun.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://java.sun.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></TD> |
| </TR> |
| </TABLE> |
| |
| <P> |
| |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| |
| <A NAME="constructor_detail"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
| <B>Constructor Detail</B></FONT></TH> |
| </TR> |
| </TABLE> |
| |
| <A NAME="AbstractFuture()"><!-- --></A><H3> |
| AbstractFuture</H3> |
| <PRE> |
| public <B>AbstractFuture</B>()</PRE> |
| <DL> |
| </DL> |
| |
| <!-- ============ METHOD DETAIL ========== --> |
| |
| <A NAME="method_detail"><!-- --></A> |
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| <B>Method Detail</B></FONT></TH> |
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| </TABLE> |
| |
| <A NAME="get(long, java.util.concurrent.TimeUnit)"><!-- --></A><H3> |
| get</H3> |
| <PRE> |
| public <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A> <B>get</B>(long timeout, |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/TimeUnit.html?is-external=true" title="class or interface in java.util.concurrent">TimeUnit</A> unit) |
| throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A>, |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/TimeoutException.html?is-external=true" title="class or interface in java.util.concurrent">TimeoutException</A>, |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</A></PRE> |
| <DL> |
| <DD><DL> |
| <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true#get(long, java.util.concurrent.TimeUnit)" title="class or interface in java.util.concurrent">get</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</A><<A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A>></CODE></DL> |
| </DD> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE> |
| <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/TimeoutException.html?is-external=true" title="class or interface in java.util.concurrent">TimeoutException</A></CODE> |
| <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</A></CODE></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="get()"><!-- --></A><H3> |
| get</H3> |
| <PRE> |
| public <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A> <B>get</B>() |
| throws <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A>, |
| <A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</A></PRE> |
| <DL> |
| <DD><DL> |
| <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true#get()" title="class or interface in java.util.concurrent">get</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</A><<A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A>></CODE></DL> |
| </DD> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</A></CODE> |
| <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</A></CODE></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="isDone()"><!-- --></A><H3> |
| isDone</H3> |
| <PRE> |
| public boolean <B>isDone</B>()</PRE> |
| <DL> |
| <DD><DL> |
| <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true#isDone()" title="class or interface in java.util.concurrent">isDone</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</A><<A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A>></CODE></DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="isCancelled()"><!-- --></A><H3> |
| isCancelled</H3> |
| <PRE> |
| public boolean <B>isCancelled</B>()</PRE> |
| <DL> |
| <DD><DL> |
| <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true#isCancelled()" title="class or interface in java.util.concurrent">isCancelled</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</A><<A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A>></CODE></DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="cancel(boolean)"><!-- --></A><H3> |
| cancel</H3> |
| <PRE> |
| public boolean <B>cancel</B>(boolean mayInterruptIfRunning)</PRE> |
| <DL> |
| <DD><DL> |
| <DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true#cancel(boolean)" title="class or interface in java.util.concurrent">cancel</A></CODE> in interface <CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/util/concurrent/Future.html?is-external=true" title="class or interface in java.util.concurrent">Future</A><<A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A>></CODE></DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="set(java.lang.Object)"><!-- --></A><A NAME="set(V)"><!-- --></A><H3> |
| set</H3> |
| <PRE> |
| protected boolean <B>set</B>(<A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html" title="type parameter in AbstractFuture">V</A> value)</PRE> |
| <DL> |
| <DD>Subclasses should invoke this method to set the result of the computation |
| to <code>value</code>. This will set the state of the future to |
| <CODE>AbstractFuture.Sync.COMPLETED</CODE> and call <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#done()"><CODE>done()</CODE></A> if the |
| state was successfully changed. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>value</CODE> - the value that was the result of the task. |
| <DT><B>Returns:</B><DD>true if the state was successfully changed.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setException(java.lang.Throwable)"><!-- --></A><H3> |
| setException</H3> |
| <PRE> |
| protected boolean <B>setException</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</A> throwable)</PRE> |
| <DL> |
| <DD>Subclasses should invoke this method to set the result of the computation |
| to an error, <code>throwable</code>. This will set the state of the future to |
| <CODE>AbstractFuture.Sync.COMPLETED</CODE> and call <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#done()"><CODE>done()</CODE></A> if the |
| state was successfully changed. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>throwable</CODE> - the exception that the task failed with. |
| <DT><B>Returns:</B><DD>true if the state was successfully changed. |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Error.html?is-external=true" title="class or interface in java.lang">Error</A></CODE> - if the throwable was an <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Error.html?is-external=true" title="class or interface in java.lang"><CODE>Error</CODE></A>.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="cancel()"><!-- --></A><H3> |
| cancel</H3> |
| <PRE> |
| protected final boolean <B>cancel</B>()</PRE> |
| <DL> |
| <DD>Subclasses should invoke this method to mark the future as cancelled. |
| This will set the state of the future to <CODE>AbstractFuture.Sync.CANCELLED</CODE> and call <A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#done()"><CODE>done()</CODE></A> if the state was |
| successfully changed. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>true if the state was successfully changed.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="done()"><!-- --></A><H3> |
| done</H3> |
| <PRE> |
| protected void <B>done</B>()</PRE> |
| <DL> |
| <DD><DL> |
| </DL> |
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