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Service (Guava Libraries 2010.01.04)
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com.google.common.base</FONT>
<BR>
Interface Service</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../com/google/common/util/concurrent/AbstractExecutionThreadService.html" title="class in com.google.common.util.concurrent">AbstractExecutionThreadService</A>, <A HREF="../../../../com/google/common/util/concurrent/AbstractIdleService.html" title="class in com.google.common.util.concurrent">AbstractIdleService</A>, <A HREF="../../../../com/google/common/util/concurrent/AbstractService.html" title="class in com.google.common.util.concurrent">AbstractService</A>, <A HREF="../../../../com/google/common/util/concurrent/ForwardingService.html" title="class in com.google.common.util.concurrent">ForwardingService</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public interface <B>Service</B></DL>
</PRE>
<P>
An object with an operational state, plus asynchronous <A HREF="../../../../com/google/common/base/Service.html#start()"><CODE>start()</CODE></A> and
<A HREF="../../../../com/google/common/base/Service.html#stop()"><CODE>stop()</CODE></A> lifecycle methods to transfer into and out of this state.
Example services include webservers, RPC servers and timers. The normal
lifecycle of a service is:
<ul>
<li><A HREF="../../../../com/google/common/base/Service.State.html#NEW"><CODE>Service.State.NEW</CODE></A> -></li>
<li><A HREF="../../../../com/google/common/base/Service.State.html#STARTING"><CODE>Service.State.STARTING</CODE></A> -></li>
<li><A HREF="../../../../com/google/common/base/Service.State.html#RUNNING"><CODE>Service.State.RUNNING</CODE></A> -></li>
<li><A HREF="../../../../com/google/common/base/Service.State.html#STOPPING"><CODE>Service.State.STOPPING</CODE></A> -></li>
<li><A HREF="../../../../com/google/common/base/Service.State.html#TERMINATED"><CODE>Service.State.TERMINATED</CODE></A></li>
</ul>
If the service fails while starting, running or stopping, its state will be
<A HREF="../../../../com/google/common/base/Service.State.html#FAILED"><CODE>Service.State.FAILED</CODE></A>, and its behavior is undefined. Such a service cannot be
started nor stopped.
<p>Implementors of this interface are strongly encouraged to extend <A HREF="../../../../com/google/common/util/concurrent/AbstractService.html" title="class in com.google.common.util.concurrent"><CODE>AbstractService</CODE></A> or <A HREF="../../../../com/google/common/util/concurrent/AbstractExecutionThreadService.html" title="class in com.google.common.util.concurrent"><CODE>AbstractExecutionThreadService</CODE></A>, which make
the threading and state management easier.
<P>
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>2009.09.15 <b>tentative</b></DD>
<DT><B>Author:</B></DT>
<DD>Jesse Wilson</DD>
</DL>
<HR>
<P>
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<CODE>static class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Service.State.html" title="enum in com.google.common.base">Service.State</A></B></CODE>
<BR>
The lifecycle states of a service.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Service.html#isRunning()">isRunning</A></B>()</CODE>
<BR>
Returns <code>true</code> if this service is <A HREF="../../../../com/google/common/base/Service.State.html#RUNNING"><CODE>running</CODE></A>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<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/base/Service.State.html" title="enum in com.google.common.base">Service.State</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Service.html#start()">start</A></B>()</CODE>
<BR>
If the service state is <A HREF="../../../../com/google/common/base/Service.State.html#NEW"><CODE>Service.State.NEW</CODE></A>, this initiates service startup
and returns immediately.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/google/common/base/Service.State.html" title="enum in com.google.common.base">Service.State</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Service.html#startAndWait()">startAndWait</A></B>()</CODE>
<BR>
Initiates service startup (if necessary), returning once the service has
finished starting.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/google/common/base/Service.State.html" title="enum in com.google.common.base">Service.State</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Service.html#state()">state</A></B>()</CODE>
<BR>
Returns the lifecycle state of the service.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<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/base/Service.State.html" title="enum in com.google.common.base">Service.State</A>></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Service.html#stop()">stop</A></B>()</CODE>
<BR>
If the service is <A HREF="../../../../com/google/common/base/Service.State.html#STARTING"><CODE>Service.State.STARTING</CODE></A> or <A HREF="../../../../com/google/common/base/Service.State.html#RUNNING"><CODE>Service.State.RUNNING</CODE></A>, this
initiates service shutdown and returns immediately.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../../com/google/common/base/Service.State.html" title="enum in com.google.common.base">Service.State</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../com/google/common/base/Service.html#stopAndWait()">stopAndWait</A></B>()</CODE>
<BR>
Initiates service shutdown (if necessary), returning once the service has
finished stopping.</TD>
</TR>
</TABLE>
<P>
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<A NAME="start()"><!-- --></A><H3>
start</H3>
<PRE>
<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/base/Service.State.html" title="enum in com.google.common.base">Service.State</A>> <B>start</B>()</PRE>
<DL>
<DD>If the service state is <A HREF="../../../../com/google/common/base/Service.State.html#NEW"><CODE>Service.State.NEW</CODE></A>, this initiates service startup
and returns immediately. If the service has already been started, this
method returns immediately without taking action. A stopped service may not
be restarted.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>a future for the startup result, regardless of whether this call
initiated startup. Calling <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"><CODE>Future.get()</CODE></A> will block until the
service has finished starting, and returns one of <A HREF="../../../../com/google/common/base/Service.State.html#RUNNING"><CODE>Service.State.RUNNING</CODE></A>, <A HREF="../../../../com/google/common/base/Service.State.html#STOPPING"><CODE>Service.State.STOPPING</CODE></A> or <A HREF="../../../../com/google/common/base/Service.State.html#TERMINATED"><CODE>Service.State.TERMINATED</CODE></A>. If
the service fails to start, <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"><CODE>Future.get()</CODE></A> will throw an <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"><CODE>ExecutionException</CODE></A>, and the service's state will be <A HREF="../../../../com/google/common/base/Service.State.html#FAILED"><CODE>Service.State.FAILED</CODE></A>. If it has already finished starting, <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"><CODE>Future.get()</CODE></A>
returns immediately. Cancelling the returned future is unsupported and
always returns <code>false</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="startAndWait()"><!-- --></A><H3>
startAndWait</H3>
<PRE>
<A HREF="../../../../com/google/common/base/Service.State.html" title="enum in com.google.common.base">Service.State</A> <B>startAndWait</B>()</PRE>
<DL>
<DD>Initiates service startup (if necessary), returning once the service has
finished starting. Unlike calling <code>start().get()</code>, this method throws
no checked exceptions.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the state of the service when startup finished.
<DT><B>Throws:</B>
<DD><CODE>InterruptedRuntimeException</CODE> - if the thread was interrupted while
waiting for the service to finish starting up.
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</A></CODE> - if startup failed</DL>
</DD>
</DL>
<HR>
<A NAME="isRunning()"><!-- --></A><H3>
isRunning</H3>
<PRE>
boolean <B>isRunning</B>()</PRE>
<DL>
<DD>Returns <code>true</code> if this service is <A HREF="../../../../com/google/common/base/Service.State.html#RUNNING"><CODE>running</CODE></A>.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="state()"><!-- --></A><H3>
state</H3>
<PRE>
<A HREF="../../../../com/google/common/base/Service.State.html" title="enum in com.google.common.base">Service.State</A> <B>state</B>()</PRE>
<DL>
<DD>Returns the lifecycle state of the service.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="stop()"><!-- --></A><H3>
stop</H3>
<PRE>
<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/base/Service.State.html" title="enum in com.google.common.base">Service.State</A>> <B>stop</B>()</PRE>
<DL>
<DD>If the service is <A HREF="../../../../com/google/common/base/Service.State.html#STARTING"><CODE>Service.State.STARTING</CODE></A> or <A HREF="../../../../com/google/common/base/Service.State.html#RUNNING"><CODE>Service.State.RUNNING</CODE></A>, this
initiates service shutdown and returns immediately. If this is <A HREF="../../../../com/google/common/base/Service.State.html#NEW"><CODE>Service.State.NEW</CODE></A>, it is <A HREF="../../../../com/google/common/base/Service.State.html#TERMINATED"><CODE>terminated</CODE></A> without having been
started nor stopped. If the service has already been stopped, this
method returns immediately without taking action.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>a future for the shutdown result, regardless of whether this call
initiated shutdown. Calling <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"><CODE>Future.get()</CODE></A> will block until the
service has finished shutting down, and either returns <A HREF="../../../../com/google/common/base/Service.State.html#TERMINATED"><CODE>Service.State.TERMINATED</CODE></A> or throws an <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"><CODE>ExecutionException</CODE></A>. If it has
already finished stopping, <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"><CODE>Future.get()</CODE></A> returns immediately.
Cancelling this future is unsupported and always returns <code>false</code>.</DL>
</DD>
</DL>
<HR>
<A NAME="stopAndWait()"><!-- --></A><H3>
stopAndWait</H3>
<PRE>
<A HREF="../../../../com/google/common/base/Service.State.html" title="enum in com.google.common.base">Service.State</A> <B>stopAndWait</B>()</PRE>
<DL>
<DD>Initiates service shutdown (if necessary), returning once the service has
finished stopping. If this is <A HREF="../../../../com/google/common/base/Service.State.html#STARTING"><CODE>Service.State.STARTING</CODE></A>, startup will be
cancelled. If this is <A HREF="../../../../com/google/common/base/Service.State.html#NEW"><CODE>Service.State.NEW</CODE></A>, it is <A HREF="../../../../com/google/common/base/Service.State.html#TERMINATED"><CODE>terminated</CODE></A> without having been started nor stopped. Unlike calling <code>stop().get()</code>, this method throws no checked exceptions.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the state of the service when shutdown finished.
<DT><B>Throws:</B>
<DD><CODE>InterruptedRuntimeException</CODE> - if the thread was interrupted while
waiting for the service to finish shutting down.
<DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/RuntimeException.html?is-external=true" title="class or interface in java.lang">RuntimeException</A></CODE> - if shutdown failed</DL>
</DD>
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