author | alundblad |
Tue, 17 Jun 2014 14:01:27 +0200 | |
changeset 25299 | b4a7dcd657f5 |
parent 22449 | 1fd6d4bec7dd |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 2014, 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 com.sun.tools.sjavac.server; |
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import java.util.concurrent.ExecutorService; |
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import java.util.concurrent.Executors; |
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import java.util.concurrent.Semaphore; |
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import java.util.Stack; |
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import java.util.concurrent.Future; |
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import com.sun.tools.sjavac.comp.JavacServiceImpl; |
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/** The compiler pool maintains compiler threads. |
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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 |
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* risk. This code and its internal interfaces are subject to change |
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* or deletion without notice.</b></p> |
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*/ |
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public class CompilerPool { |
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// The javac server that created this pool. |
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private JavacServer javacServer; |
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// A semaphore protecting the poolsize number of threads. |
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private Semaphore available; |
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// The stack of compiler threads. |
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private Stack<CompilerThread> compilers = new Stack<>(); |
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// And the executor server to spawn threads. |
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private final ExecutorService executorPool; |
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// How many requests are active right now? |
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private int concurrentRequests = 0; |
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// When was the last request finished? |
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private long lastRequestFinished = 0; |
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// The total number of requests to this pool. |
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private int numRequests = 0; |
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// Protect access to the three above values. |
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private static final Object conc = new Object(); |
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/** |
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* Return the javac server that this pool belongs to. |
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*/ |
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public JavacServer getJavacServer() { |
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return javacServer; |
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} |
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/** |
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* Return how many threads are running at this very moment. |
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*/ |
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public int numActiveRequests() |
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{ |
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synchronized (conc) { |
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return concurrentRequests; |
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} |
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} |
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/** |
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* Return when the last request was finished. |
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* I.e. the pool has been idle since. |
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*/ |
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public long lastRequestFinished() |
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{ |
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synchronized (conc) { |
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return lastRequestFinished; |
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} |
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} |
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/** |
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* Up the number of active requests. |
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*/ |
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public int startRequest() { |
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int n; |
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synchronized (conc) { |
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concurrentRequests++; |
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numRequests++; |
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n = numRequests; |
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} |
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return n; |
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} |
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/** |
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* Down the number of active requests. Return the current time. |
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*/ |
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public long stopRequest() { |
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synchronized (conc) { |
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concurrentRequests--; |
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lastRequestFinished = System.currentTimeMillis(); |
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} |
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return lastRequestFinished; |
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} |
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/** |
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* Create a new compiler pool. |
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*/ |
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CompilerPool(int poolsize, JavacServer server) { |
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available = new Semaphore(poolsize, true); |
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javacServer = server; |
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executorPool = Executors.newFixedThreadPool(poolsize); |
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lastRequestFinished = System.currentTimeMillis(); |
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} |
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/** |
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* Execute a compiler thread. |
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*/ |
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public void execute(CompilerThread ct) { |
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executorPool.execute(ct); |
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} |
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/** |
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* Execute a minor task, for example generating bytecodes and writing them to disk, |
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* that belong to a major compiler thread task. |
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*/ |
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public Future<?> executeSubtask(CompilerThread t, Runnable r) { |
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return executorPool.submit(r); |
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} |
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/** |
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* Shutdown the pool. |
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*/ |
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public void shutdown() { |
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executorPool.shutdown(); |
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} |
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|
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/** |
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* Acquire a compiler thread from the pool, or block until a thread is available. |
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* If the pools is empty, create a new thread, but never more than is "available". |
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*/ |
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public CompilerThread grabCompilerThread() throws InterruptedException { |
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available.acquire(); |
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if (compilers.empty()) { |
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return new CompilerThread(this, new JavacServiceImpl(javacServer)); |
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} |
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return compilers.pop(); |
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} |
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|
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/** |
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* Return the specified compiler thread to the pool. |
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*/ |
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public void returnCompilerThread(CompilerThread h) { |
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compilers.push(h); |
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available.release(); |
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} |
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} |
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165 |