Mercurial > hg > jdk9-shenandoah > langtools
view src/jdk.compiler/share/classes/com/sun/tools/sjavac/server/IdleResetSjavac.java @ 3022:5ba1a29a0eb0
8129114: Sjavac should stream back compiler output to the client as soon as it becomes available
Summary: Protocol revised, javac output sent back to client slightly earlier.
Reviewed-by: jlahoda
author | alundblad |
---|---|
date | Fri, 04 Sep 2015 13:24:15 +0200 |
parents | adba44f6b471 |
children |
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/* * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.tools.sjavac.server; import java.io.Writer; import java.util.Timer; import java.util.TimerTask; /** * An sjavac implementation that keeps track of idleness and shuts down the * given Terminable upon idleness timeout. * * An idleness timeout kicks in {@code idleTimeout} milliseconds after the last * request is completed. * * <p><b>This is NOT part of any supported API. * If you write code that depends on this, you do so at your own risk. * This code and its internal interfaces are subject to change or * deletion without notice.</b> */ public class IdleResetSjavac implements Sjavac { private final Sjavac delegate; private final Terminable toShutdown; private final Timer idlenessTimer = new Timer(); private final long idleTimeout; private int outstandingCalls = 0; // Class invariant: idlenessTimerTask != null <-> idlenessTimerTask is scheduled private TimerTask idlenessTimerTask; public IdleResetSjavac(Sjavac delegate, Terminable toShutdown, long idleTimeout) { this.delegate = delegate; this.toShutdown = toShutdown; this.idleTimeout = idleTimeout; scheduleTimeout(); } @Override public int compile(String[] args, Writer out, Writer err) { startCall(); try { return delegate.compile(args, out, err); } finally { endCall(); } } private synchronized void startCall() { // Was there no outstanding calls before this call? if (++outstandingCalls == 1) { // Then the timer task must have been scheduled if (idlenessTimerTask == null) throw new IllegalStateException("Idle timeout already cancelled"); // Cancel timeout task idlenessTimerTask.cancel(); idlenessTimerTask = null; } } private synchronized void endCall() { if (--outstandingCalls == 0) { // No more outstanding calls. Schedule timeout. scheduleTimeout(); } } private void scheduleTimeout() { if (idlenessTimerTask != null) throw new IllegalStateException("Idle timeout already scheduled"); idlenessTimerTask = new TimerTask() { public void run() { toShutdown.shutdown("Server has been idle for " + (idleTimeout / 1000) + " seconds."); } }; idlenessTimer.schedule(idlenessTimerTask, idleTimeout); } @Override public void shutdown() { idlenessTimer.cancel(); delegate.shutdown(); } }