/*
* Copyright (C) 2013 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.caliper.bridge;
import com.sun.management.HotSpotDiagnosticMXBean;
import java.io.IOException;
import java.lang.management.ManagementFactory;
import javax.management.MBeanServer;
/**
* A simple class that invokes {@link System#gc()} over and over to generate some GC log messages.
*/
public final class GcLogMessageGenerator {
public static void main(String[] args) throws IOException {
checkGcLogging();
for (int i = 0; i < 100; i++) {
System.gc();
}
}
private static final String HOTSPOT_BEAN_NAME = "com.sun.management:type=HotSpotDiagnostic";
private static void checkGcLogging() throws IOException {
MBeanServer server = ManagementFactory.getPlatformMBeanServer();
HotSpotDiagnosticMXBean bean = ManagementFactory.newPlatformMXBeanProxy(
server, HOTSPOT_BEAN_NAME, HotSpotDiagnosticMXBean.class);
if (!bean.getVMOption("PrintGC").getValue().equals(Boolean.TRUE.toString())) {
System.err.println("This is only useful if you run with -XX:+PrintGC");
System.exit(1);
}
}
}