1 /*

     2  * Copyright (c) 2010, 2013, 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.

     8  *

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

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

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

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

    13  * accompanied this code).

    14  *

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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

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

    18  *

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

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

    21  * questions.

    22  */

    23 

    24 import java.io.PrintWriter;

    25 import java.io.StringWriter;

    26 import java.util.concurrent.ExecutorService;

    27 import java.util.concurrent.Executors;

    28 import java.util.concurrent.ThreadFactory;

    29 import java.util.concurrent.TimeUnit;

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

    31 import javax.tools.JavaCompiler;

    32 import javax.tools.StandardJavaFileManager;

    33 import javax.tools.ToolProvider;

    34 

    35 /**

    36  * An abstract superclass for threaded tests.

    37  *

    38  * This class will try to read a property named test.concurrency.

    39  * The property can be provided by passing this option to jtreg:

    40  * -javaoption:-Dtest.concurrency=#

    41  *

    42  * If the property is not set the class will use a heuristic to determine the

    43  * maximum number of threads that can be fired to execute a given test.

    44  *

    45  * This code will have to be revisited if jprt starts using concurrency for

    46  * for running jtreg tests.

    47  */

    48 public abstract class JavacTestingAbstractThreadedTest {

    49 

    50     protected static AtomicInteger numberOfThreads = new AtomicInteger();

    51 

    52     protected static int getThreadPoolSize() {

    53         Integer testConc = Integer.getInteger("test.concurrency");

    54         if (testConc != null) return testConc;

    55         int cores = Runtime.getRuntime().availableProcessors();

    56         numberOfThreads.set(Math.max(2, Math.min(8, cores / 2)));

    57         return numberOfThreads.get();

    58     }

    59 

    60     protected static void checkAfterExec() throws InterruptedException {

    61         checkAfterExec(true);

    62     };

    63 

    64     protected static boolean throwAssertionOnError = true;

    65 

    66     protected static boolean printAll = false;

    67 

    68     protected static StringWriter errSWriter = new StringWriter();

    69     protected static PrintWriter errWriter = new PrintWriter(errSWriter);

    70 

    71     protected static StringWriter outSWriter = new StringWriter();

    72     protected static PrintWriter outWriter = new PrintWriter(outSWriter);

    73 

    74     protected static void checkAfterExec(boolean printCheckCount)

    75             throws InterruptedException {

    76         pool.shutdown();

    77         pool.awaitTermination(15, TimeUnit.MINUTES);

    78         if (errCount.get() > 0) {

    79             if (throwAssertionOnError) {

    80                 closePrinters();

    81                 System.err.println(errSWriter.toString());

    82                 throw new AssertionError(

    83                     String.format("%d errors found", errCount.get()));

    84             } else {

    85                 System.err.println(

    86                         String.format("%d errors found", errCount.get()));

    87             }

    88         } else if (printCheckCount) {

    89             outWriter.println("Total check executed: " + checkCount.get());

    90         }

    91         /*

    92          * This output is for supporting debugging. It does not mean that a given

    93          * test had executed that number of threads concurrently. The value printed

    94          * here is the maximum possible amount.

    95          */

    96         closePrinters();

    97         if (printAll) {

    98             System.out.println(errSWriter.toString());

    99             System.out.println(outSWriter.toString());

   100         }

   101         System.out.println("Total number of threads in thread pool: " +

   102                 numberOfThreads.get());

   103     }

   104 

   105     protected static void closePrinters() {

   106         errWriter.close();

   107         outWriter.close();

   108     }

   109 

   110     protected static void processException(Throwable t) {

   111         errCount.incrementAndGet();

   112         t.printStackTrace(errWriter);

   113         pool.shutdown();

   114     }

   115 

   116     //number of checks executed

   117     protected static AtomicInteger checkCount = new AtomicInteger();

   118 

   119     //number of errors found while running combo tests

   120     protected static AtomicInteger errCount = new AtomicInteger();

   121 

   122     //create default shared JavaCompiler - reused across multiple compilations

   123     protected static JavaCompiler comp = ToolProvider.getSystemJavaCompiler();

   124 

   125     protected static ExecutorService pool = Executors.newFixedThreadPool(

   126             getThreadPoolSize(), new ThreadFactory() {

   127         @Override

   128         public Thread newThread(Runnable r) {

   129             Thread t = new Thread(r);

   130             t.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {

   131                 @Override

   132                 public void uncaughtException(Thread t, Throwable e) {

   133                     pool.shutdown();

   134                     errCount.incrementAndGet();

   135                     e.printStackTrace(System.err);

   136                 }

   137             });

   138             return t;

   139         }

   140     });

   141 

   142     /*

   143      * File manager is not thread-safe so it cannot be re-used across multiple

   144      * threads. However we cache per-thread FileManager to avoid excessive

   145      * object creation

   146      */

   147     protected static final ThreadLocal<StandardJavaFileManager> fm =

   148         new ThreadLocal<StandardJavaFileManager>() {

   149             @Override protected StandardJavaFileManager initialValue() {

   150                 return comp.getStandardFileManager(null, null, null);

   151             }

   152         };

   153 

   154 }