--- /dev/null 2013-03-25 08:06:52.622249851 +0100 +++ new/test/gc/heap_inspection/TestPrintClassHistogram.java 2013-03-25 08:34:46.102223923 +0100 @@ -0,0 +1,95 @@ +/* + * Copyright (c) 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. + */ + +/* + * @test TestPrintClassHistogram + * @bug 8004924 + * @summary Checks that a class histogram can be printed both before and after + * a GC + * @library /testlibrary + * @run main/othervm TestPrintClassHistogram launch BeforeGC + * @run main/othervm TestPrintClassHistogram launch AfterGC + * @run main/othervm TestPrintClassHistogram launch BeforeGC AfterGC + */ + +import java.util.List; +import java.util.ArrayList; +import java.util.Arrays; + +import com.oracle.java.testlibrary.OutputAnalyzer; +import com.oracle.java.testlibrary.ProcessTools; + +/* This test uses a "trick" to be able to analyze the output of the test: + * + * The test starts a java process that runs the same code, but the first + * argument is different ("run" instead of "launch"). The change of flags + * will run the test code instead of launching the test again. + */ +public class TestPrintClassHistogram { + public static void main(String[] args) throws Exception { + if (shouldLaunchTest(args)) { + launchTest(args); + return; + } + + // This is the actual test code + System.gc(); + } + + private static boolean shouldLaunchTest(String[] cmdlineArguments) { + return cmdlineArguments[0].equals("launch"); + } + + private static void launchTest(String[] args) throws Exception { + String[] testArgs = createTestArguments(args); + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(testArgs); + + OutputAnalyzer output = new OutputAnalyzer(pb.start()); + output.shouldNotContain("WARNING"); + + // There will always be at least one java.lang.Class instance + output.shouldContain("java.lang.Class"); + + // There will always be at least one java.lang.String instance + output.shouldContain("java.lang.String"); + + output.shouldHaveExitValue(0); + } + + private static String[] createTestArguments(String[] cmdlineArguments) { + List cmdlineArgs = Arrays.asList(cmdlineArguments); + List testArgs = new ArrayList(); + + if (cmdlineArgs.contains("BeforeGC")) { + testArgs.add("-XX:+PrintClassHistogramBeforeFullGC"); + } + if (cmdlineArgs.contains("AfterGC")) { + testArgs.add("-XX:+PrintClassHistogramAfterFullGC"); + } + + testArgs.add("TestPrintClassHistogram"); + testArgs.add("run"); + + return testArgs.toArray(new String[testArgs.size()]); + } +}