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Java example source code file (ReferrersTest.java)
The ReferrersTest.java Java example source code/* * Copyright (c) 2005, 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. */ /** * @test * @bug 5089849 * @summary Add support for backtracking reference graph. * @author jjh * * @run build TestScaffold VMConnection TargetListener TargetAdapter * @run compile -g ReferrersTest.java * @run main ReferrersTest */ /* * To run this test do this: * runregress -no ReferrersTest <cmd line options> * * where <cmd line options> are the options to be used to * launch the debuggee, with the classname prefixed with @@. * For example, this would run java2d demo as the debuggee: * runregress -no ReferrersTest -classpath * $jdkDir/demo/jfc/Java2D/Java2Demo.jar \ * -client @@java2d.Java2Demo * * In this mode, the specified debuggee is launched in debug mode, * and the debugger waits for a keystroke before connecting to the debuggee. * * If <cmd line options> is not specified, then the ReferrersTarg class below * is run as the debuggee. */ import com.sun.jdi.*; import com.sun.jdi.event.*; import com.sun.jdi.request.*; import java.util.*; class ReferrersFiller { // This many instances of this are created. static int FILLER_COUNT = 20000; static ReferrersFiller[] lotsAndLots = new ReferrersFiller[ ReferrersFiller.FILLER_COUNT]; int xx; ReferrersFiller(int p1) { xx = p1; } } class ReferrersTarg { // This many instances + 1 of this class are created. static int TARG_COUNT = 10; static ReferrersTarg theReferrersTarg; static ReferrersTarg[] allReferrersTargs; // Each instance will point to the theReferrersTarg ReferrersTarg oneReferrersTarg; public static void bkpt() { } public static void main(String[] args) { System.out.println("Howdy!"); for (int ii = 0; ii < ReferrersFiller.lotsAndLots.length; ii++) { ReferrersFiller.lotsAndLots[ii] = new ReferrersFiller(ii); } theReferrersTarg = new ReferrersTarg(); allReferrersTargs = new ReferrersTarg[ReferrersTarg.TARG_COUNT]; for (int ii = 0; ii < ReferrersTarg.TARG_COUNT; ii++) { allReferrersTargs[ii] = new ReferrersTarg(); allReferrersTargs[ii].oneReferrersTarg = theReferrersTarg; } bkpt(); System.out.println("Goodbye from ReferrersTarg!"); } } /********** test program **********/ public class ReferrersTest extends TestScaffold { static String targetName = "ReferrersTarg"; ReferenceType targetClass; ThreadReference mainThread; ReferrersTest(String args[]) { super(args); } public static void main(String[] args) throws Exception { /* * If args contains @@xxxx, then that is the * name of the class we are to run. */ for (int ii = 0; ii < args.length; ii ++) { if (args[ii].startsWith("@@")) { targetName = args[ii] = args[ii].substring(2); break; } } new ReferrersTest(args).startTests(); } /* * Used to sort a list of ReferenceTypes by * instance count. */ class ToSort implements Comparable<ToSort> { long count; ReferenceType rt; public ToSort(long count, ReferenceType rt) { this.count = count; this.rt = rt; } public int compareTo(ToSort obj) { if (count < obj.count) return -1; if (count == obj.count) return 0; return 1; } } protected void runTests() throws Exception { /* * Get to the top of main() * to determine targetClass and mainThread */ int CUT_OFF = 1000; BreakpointEvent bpe; bpe = startToMain(targetName); targetClass = bpe.location().declaringType(); mainThread = bpe.thread(); if (targetName.equals("ReferrersTarg")) { resumeTo("ReferrersTarg", "bkpt", "()V"); } else { // Let debuggee run for awhile to get classes loaded vm().resume(); try { System.err.println("Press <enter> to continue"); System.in.read(); System.err.println("running..."); } catch(Exception e) { } vm().suspend(); } // Get all classes. long start = System.currentTimeMillis(); List<ReferenceType> allClasses = vm().allClasses(); long end = System.currentTimeMillis(); System.out.println( allClasses.size() + " classes from vm.allClasses() took " + (end - start) + " ms"); long[] counts; // Test for NPE { boolean pass = false; try { counts = vm().instanceCounts(null); } catch (NullPointerException ee) { pass = true; } if (!pass) { failure("failure: NullPointerException not thrown on instanceCounts(null)"); } } // Test for 0 length array { List<ReferenceType>someClasses = new ArrayList(2); counts = vm().instanceCounts(someClasses); if (counts.length != 0) { failure("failure: instanceCounts with a zero length array fails: " + counts.length); } } // Test various values of maxInstances if (targetClass.name().equals("ReferrersTarg")) { List<ObjectReference> noInstances = targetClass.instances(0); if (noInstances.size() != ReferrersTarg.TARG_COUNT + 1) { failure("failure: instances(0): " + noInstances.size() + ", for " + targetClass); } noInstances = targetClass.instances(1); if (noInstances.size() != 1) { failure("failure: instances(1): " + noInstances.size() + ", for " + targetClass); } boolean pass = false; try { noInstances = targetClass.instances(-1); } catch (IllegalArgumentException ee) { pass = true; } if (!pass) { failure("failure: instances(-1) did not get an exception"); } } // Instance counts for all classes start = System.currentTimeMillis(); counts = vm().instanceCounts(allClasses); end = System.currentTimeMillis(); if (counts.length == 0) { System.out.println("failure: No instances found"); throw new Exception("ReferrersTest: failed"); } // Create a list of ReferenceTypes sorted by instance count int size = 0; List<ToSort> sorted = new ArrayList(allClasses.size()); for (int ii = 0; ii < allClasses.size(); ii++) { size += counts[ii]; ToSort tos = new ToSort(counts[ii], allClasses.get(ii)); sorted.add(tos); } System.out.println("instance counts for " + counts.length + " classes got " + size + " instances and took " + (end - start) + " ms"); boolean gotReferrersFiller = false; boolean gotReferrersTarg = false; Collections.sort(sorted); for (int ii = sorted.size() - 1; ii >= 0 ; ii--) { ToSort xxx = sorted.get(ii); if (xxx.rt.name().equals("ReferrersFiller") && xxx.count == ReferrersFiller.FILLER_COUNT) { gotReferrersFiller = true; } if (xxx.rt.name().equals("ReferrersTarg") && xxx.count == ReferrersTarg.TARG_COUNT + 1) { gotReferrersTarg = true; } } if (!gotReferrersFiller) { failure("failure: Expected " + ReferrersFiller.FILLER_COUNT + " instances of ReferrersFiller"); } if (!gotReferrersTarg) { failure("failure: Expected " + (ReferrersTarg.TARG_COUNT + 1) + " instances of ReferrersTarg"); } List<List Other Java examples (source code examples)Here is a short list of links related to this Java ReferrersTest.java source code file: |
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