jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/sjavac/server/CompilerPool.java@998b10c43157 (annotated)

src/share/classes/com/sun/tools/sjavac/server/CompilerPool.java@998b10c43157 (annotated)

src/share/classes/com/sun/tools/sjavac/server/CompilerPool.java

Tue, 24 Dec 2013 09:17:37 -0800

author: ksrini
date: Tue, 24 Dec 2013 09:17:37 -0800
changeset 2227: 998b10c43157
parent 1504: 22e417cdddee
child 2525: 2eb010b6cb22
permissions: -rw-r--r--

8029230: Update copyright year to match last edit in jdk8 langtools repository for 2013
Reviewed-by: ksrini
Contributed-by: steve.sides@oracle.com

 /*
  * Copyright (c) 2012, 2013, 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.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Semaphore;
 import java.util.Stack;
 import java.util.concurrent.Future;
 /** The compiler pool maintains compiler threads.
  *
  * <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></p>
  */
 public class CompilerPool {
     // The javac server that created this pool.
     private JavacServer javacServer;
     // A semaphore protecting the poolsize number of threads.
     private Semaphore available;
     // The stack of compiler threads.
     private Stack<CompilerThread> compilers = new Stack<CompilerThread>();
     // And the executor server to spawn threads.
     private final ExecutorService executorPool;
     // How many requests are active right now?
     private int concurrentRequests = 0;
     // When was the last request finished?
     private long lastRequestFinished = 0;
     // The total number of requests to this pool.
     private int numRequests = 0;
     // Protect access to the three above values.
     private static final Object conc = new Object();
     /**
      * Return the javac server that this pool belongs to.
      */
     public JavacServer getJavacServer() {
         return javacServer;
     }
     /**
      * Return how many threads are running at this very moment.
      */
     public int numActiveRequests()
     {
         synchronized (conc) {
             return concurrentRequests;
         }
     }
     /**
      * Return when the last request was finished.
      * I.e. the pool has been idle since.
      */
     public long lastRequestFinished()
     {
         synchronized (conc) {
             return lastRequestFinished;
         }
     }
     /**
      * Up the number of active requests.
      */
     public int startRequest() {
         int n;
         synchronized (conc) {
             concurrentRequests++;
             numRequests++;
             n = numRequests;
         }
         return n;
     }
     /**
      * Down the number of active requests. Return the current time.
      */
     public long stopRequest() {
         synchronized (conc) {
             concurrentRequests--;
             lastRequestFinished = System.currentTimeMillis();
         }
         return lastRequestFinished;
     }
     /**
      * Create a new compiler pool.
      */
     CompilerPool(int poolsize, JavacServer server) {
         available = new Semaphore(poolsize, true);
         javacServer = server;
         executorPool = Executors.newFixedThreadPool(poolsize);
         lastRequestFinished = System.currentTimeMillis();
     }
     /**
      * Execute a compiler thread.
      */
     public void execute(CompilerThread ct) {
         executorPool.execute(ct);
     }
     /**
      * Execute a minor task, for example generating bytecodes and writing them to disk,
      * that belong to a major compiler thread task.
      */
     public Future<?> executeSubtask(CompilerThread t, Runnable r) {
         return executorPool.submit(r);
     }
     /**
      * Shutdown the pool.
      */
     public void shutdown() {
         executorPool.shutdown();
     }
     /**
      * Acquire a compiler thread from the pool, or block until a thread is available.
      * If the pools is empty, create a new thread, but never more than is "available".
      */
     public CompilerThread grabCompilerThread() throws InterruptedException {
         available.acquire();
         if (compilers.empty()) {
             return new CompilerThread(this);
         }
         return compilers.pop();
     }
     /**
      * Return the specified compiler thread to the pool.
      */
     public void returnCompilerThread(CompilerThread h) {
         compilers.push(h);
         available.release();
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/sjavac/server/CompilerPool.java@998b10c43157 (annotated)

src/share/classes/com/sun/tools/sjavac/server/CompilerPool.java