114 lines
3.8 KiB
Java
114 lines
3.8 KiB
Java
/*
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* Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javacserver.server;
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import java.util.Timer;
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import java.util.TimerTask;
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import javacserver.Log;
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import javacserver.Result;
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/**
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* An sjavac implementation that keeps track of idleness and shuts down the
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* given Terminable upon idleness timeout.
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*
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* An idleness timeout kicks in {@code idleTimeout} milliseconds after the last
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* request is completed.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class IdleResetSjavac implements Sjavac {
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private final Sjavac delegate;
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private final Terminable toShutdown;
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private final Timer idlenessTimer = new Timer();
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private final long idleTimeout;
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private int outstandingCalls = 0;
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// Class invariant: idlenessTimerTask != null <-> idlenessTimerTask is scheduled
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private TimerTask idlenessTimerTask;
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public IdleResetSjavac(Sjavac delegate,
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Terminable toShutdown,
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long idleTimeout) {
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this.delegate = delegate;
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this.toShutdown = toShutdown;
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this.idleTimeout = idleTimeout;
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scheduleTimeout();
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}
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@Override
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public Result compile(String[] args) {
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startCall();
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try {
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return delegate.compile(args);
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} finally {
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endCall();
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}
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}
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private synchronized void startCall() {
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// Was there no outstanding calls before this call?
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if (++outstandingCalls == 1) {
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// Then the timer task must have been scheduled
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if (idlenessTimerTask == null)
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throw new IllegalStateException("Idle timeout already cancelled");
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// Cancel timeout task
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idlenessTimerTask.cancel();
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idlenessTimerTask = null;
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}
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}
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private synchronized void endCall() {
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if (--outstandingCalls == 0) {
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// No more outstanding calls. Schedule timeout.
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scheduleTimeout();
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}
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}
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private void scheduleTimeout() {
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if (idlenessTimerTask != null)
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throw new IllegalStateException("Idle timeout already scheduled");
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idlenessTimerTask = new TimerTask() {
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public void run() {
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Log.setLogForCurrentThread(ServerMain.getErrorLog());
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toShutdown.shutdown("Server has been idle for " + (idleTimeout / 1000) + " seconds.");
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}
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};
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idlenessTimer.schedule(idlenessTimerTask, idleTimeout);
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}
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@Override
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public void shutdown() {
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idlenessTimer.cancel();
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delegate.shutdown();
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}
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}
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