1 /*

     2  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package com.sun.tools.sjavac.comp;

    26 

    27 import java.io.File;

    28 import java.net.URI;

    29 import java.util.List;

    30 import java.util.Objects;

    31 import java.util.Set;

    32 import java.util.concurrent.Callable;

    33 import java.util.concurrent.ExecutorService;

    34 import java.util.concurrent.Executors;

    35 import java.util.concurrent.ThreadFactory;

    36 import java.util.concurrent.TimeUnit;

    37 import java.util.concurrent.atomic.AtomicInteger;

    38 

    39 import com.sun.tools.sjavac.Log;

    40 import com.sun.tools.sjavac.server.CompilationResult;

    41 import com.sun.tools.sjavac.server.Sjavac;

    42 import com.sun.tools.sjavac.server.SysInfo;

    43 

    44 /**

    45  * An sjavac implementation that limits the number of concurrent calls by

    46  * wrapping invocations in Callables and delegating them to a FixedThreadPool.

    47  *

    48  *  <p><b>This is NOT part of any supported API.

    49  *  If you write code that depends on this, you do so at your own risk.

    50  *  This code and its internal interfaces are subject to change or

    51  *  deletion without notice.</b>

    52  */

    53 public class PooledSjavac implements Sjavac {

    54 

    55     final Sjavac delegate;

    56     final ExecutorService pool;

    57 

    58     public PooledSjavac(Sjavac delegate, int poolsize) {

    59         Objects.requireNonNull(delegate);

    60         this.delegate = delegate;

    61         pool = Executors.newFixedThreadPool(poolsize, new ThreadFactory() {

    62             AtomicInteger count = new AtomicInteger();

    63             @Override

    64             public Thread newThread(Runnable runnable) {

    65                 String cls = PooledSjavac.class.getSimpleName();

    66                 int num = count.incrementAndGet();

    67                 Thread t = new Thread(runnable, cls + "-" + num);

    68                 t.setDaemon(true);

    69                 return t;

    70             }

    71         });

    72     }

    73 

    74     @Override

    75     public SysInfo getSysInfo() {

    76         try {

    77             return pool.submit(new Callable<SysInfo>() {

    78                 @Override

    79                 public SysInfo call() throws Exception {

    80                     return delegate.getSysInfo();

    81                 }

    82             }).get();

    83         } catch (Exception e) {

    84             e.printStackTrace();

    85             throw new RuntimeException("Error during getSysInfo", e);

    86         }

    87     }

    88 

    89     @Override

    90     public CompilationResult compile(final String protocolId,

    91                                      final String invocationId,

    92                                      final String[] args,

    93                                      final List<File> explicitSources,

    94                                      final Set<URI> sourcesToCompile,

    95                                      final Set<URI> visibleSources) {

    96         try {

    97             return pool.submit(new Callable<CompilationResult>() {

    98                 @Override

    99                 public CompilationResult call() throws Exception {

   100                     return delegate.compile(protocolId,

   101                                             invocationId,

   102                                             args,

   103                                             explicitSources,

   104                                             sourcesToCompile,

   105                                             visibleSources);

   106                 }

   107             }).get();

   108         } catch (Exception e) {

   109             e.printStackTrace();

   110             throw new RuntimeException("Error during compile", e);

   111         }

   112     }

   113 

   114     @Override

   115     public void shutdown() {

   116         pool.shutdown(); // Disable new tasks from being submitted

   117         try {

   118             // Wait a while for existing tasks to terminate

   119             if (!pool.awaitTermination(60, TimeUnit.SECONDS)) {

   120                 pool.shutdownNow(); // Cancel currently executing tasks

   121                 // Wait a while for tasks to respond to being cancelled

   122                 if (!pool.awaitTermination(60, TimeUnit.SECONDS))

   123                     Log.error("ThreadPool did not terminate");

   124             }

   125             // Grace period for thread termination

   126             Thread.sleep(1000);

   127         } catch (InterruptedException ie) {

   128           // (Re-)Cancel if current thread also interrupted

   129           pool.shutdownNow();

   130           // Preserve interrupt status

   131           Thread.currentThread().interrupt();

   132         }

   133 

   134         delegate.shutdown();

   135     }

   136 

   137     @Override

   138     public String serverSettings() {

   139         return delegate.serverSettings();

   140     }

   141 }