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AbstractFuture (Guava Libraries 2010.01.04)
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com.google.common.util.concurrent</FONT>
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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 ======== -->
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<TD><CODE><B><A HREF="../../../../../com/google/common/util/concurrent/AbstractFuture.html#AbstractFuture()">AbstractFuture</A></B>()</CODE>
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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>
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<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="">
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<B>Constructor Detail</B></FONT></TH>
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<A NAME="AbstractFuture()"><!-- --></A><H3>
AbstractFuture</H3>
<PRE>
public <B>AbstractFuture</B>()</PRE>
<DL>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<B>Method Detail</B></FONT></TH>
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<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>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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