| /* |
| * Copyright (c) 2014, 2016, 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 com.sun.tools.sjavac.Log; |
| |
| import java.io.FileWriter; |
| import java.io.IOException; |
| 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) { |
| startCall(); |
| try { |
| return delegate.compile(args); |
| } 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() { |
| Log.setLogForCurrentThread(ServerMain.getErrorLog()); |
| toShutdown.shutdown("Server has been idle for " + (idleTimeout / 1000) + " seconds."); |
| } |
| }; |
| idlenessTimer.schedule(idlenessTimerTask, idleTimeout); |
| } |
| |
| @Override |
| public void shutdown() { |
| idlenessTimer.cancel(); |
| delegate.shutdown(); |
| } |
| |
| } |