| /* |
| * 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); |
| } |
| } |
| } |