8005167: execution time of combo tests in javac should be improved

Reviewed-by: jjg, jjh

langtools/test/tools/javac/lib/JavacTestingAbstractThreadedTest.java

@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2010, 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.
+ *
+ * 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.
+ */
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.atomic.AtomicInteger;
+import javax.tools.JavaCompiler;
+import javax.tools.StandardJavaFileManager;
+import javax.tools.ToolProvider;
+
+/**
+ * An abstract superclass for threaded tests.
+ *
+ * This class will try to read a property named test.concurrency.
+ * The property can be provided by passing this option to jtreg:
+ * -javaoption:-Dtest.concurrency=#
+ *
+ * If the property is not set the class will use a heuristic to determine the
+ * maximum number of threads that can be fired to execute a given test.
+ */
+public abstract class JavacTestingAbstractThreadedTest {
+
+    protected static int getThreadPoolSize() {
+        Integer testConc = Integer.getInteger("test.concurrency");
+        if (testConc != null) return testConc;
+        int cores = Runtime.getRuntime().availableProcessors();
+        return Math.max(2, Math.min(8, cores / 2));
+    }
+
+    protected static void checkAfterExec() throws InterruptedException {
+        checkAfterExec(true);
+    };
+
+    protected static boolean throwAssertionOnError = true;
+
+    protected static boolean printAll = false;
+
+    protected static StringWriter errSWriter = new StringWriter();
+    protected static PrintWriter errWriter = new PrintWriter(errSWriter);
+
+    protected static StringWriter outSWriter = new StringWriter();
+    protected static PrintWriter outWriter = new PrintWriter(outSWriter);
+
+    protected static void checkAfterExec(boolean printCheckCount)
+            throws InterruptedException {
+        pool.shutdown();
+        while (!pool.isTerminated()) {
+            Thread.sleep(10);
+        }
+        if (errCount.get() > 0) {
+            if (throwAssertionOnError) {
+                closePrinters();
+                System.err.println(errSWriter.toString());
+                throw new AssertionError(
+                    String.format("%d errors found", errCount.get()));
+            } else {
+                System.err.println(
+                        String.format("%d errors found", errCount.get()));
+            }
+        } else if (printCheckCount) {
+            outWriter.println("Total check executed: " + checkCount.get());
+        }
+        closePrinters();
+        if (printAll) {
+            System.out.println(errSWriter.toString());
+            System.out.println(outSWriter.toString());
+        }
+    }
+
+    protected static void closePrinters() {
+        errWriter.close();
+        outWriter.close();
+    }
+
+    protected static void processException(Throwable t) {
+        errCount.incrementAndGet();
+        t.printStackTrace(errWriter);
+        pool.shutdown();
+    }
+
+    //number of checks executed
+    protected static AtomicInteger checkCount = new AtomicInteger();
+
+    //number of errors found while running combo tests
+    protected static AtomicInteger errCount = new AtomicInteger();
+
+    //create default shared JavaCompiler - reused across multiple compilations
+    protected static JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
+
+    protected static ExecutorService pool = Executors.newFixedThreadPool(
+            getThreadPoolSize(), new ThreadFactory() {
+        @Override
+        public Thread newThread(Runnable r) {
+            Thread t = new Thread(r);
+            t.setUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
+                @Override
+                public void uncaughtException(Thread t, Throwable e) {
+                    pool.shutdown();
+                    errCount.incrementAndGet();
+                    e.printStackTrace(System.err);
+                }
+            });
+            return t;
+        }
+    });
+
+    /*
+     * File manager is not thread-safe so it cannot be re-used across multiple
+     * threads. However we cache per-thread FileManager to avoid excessive
+     * object creation
+     */
+    protected static final ThreadLocal<StandardJavaFileManager> fm =
+        new ThreadLocal<StandardJavaFileManager>() {
+            @Override protected StandardJavaFileManager initialValue() {
+                return comp.getStandardFileManager(null, null, null);
+            }
+        };
+
+}