/*
* Copyright 2015-2016 the original author or authors.
*
* 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 org.springframework.integration.test.util;
/**
* Use to take a heap dump programmatically. Useful to examine the heap when debugging
* sporadic test failures.
* <p>Commented out because it uses access-restricted classes and some IDEs won't build
* the project without relaxing the access restriction.
* <p>Usage: {@code HeapDumper.dumpHeap("/tmp/foo.hprof");}
* <p>If the file exists already, it will be replaced.
* <p>Courtesy:
* https://blogs.oracle.com/sundararajan/entry/programmatically_dumping_heap_from_java
* <pre>
* See https://docs.oracle.com/javase/8/docs/jre/api/management/extension/com/sun/management/HotSpotDiagnosticMXBean.html#dumpHeap-java.lang.String-boolean-
* </pre>
* @author Gary Russell
* @since 4.2
*
*/
public class HeapDumper {
// // This is the name of the HotSpot Diagnostic MBean
// private static final String HOTSPOT_BEAN_NAME = "com.sun.management:type=HotSpotDiagnostic";
//
// // field to store the hotspot diagnostic MBean
// private static volatile HotSpotDiagnosticMXBean hotspotMBean;
//
// private HeapDumper() {
// super();
// }
//
// public static void dumpHeap(String fileName) {
// dumpHeap(fileName, true);
// }
//
// public static void dumpHeap(String fileName, boolean live) {
// File file = new File(fileName);
// if (file.exists()) {
// file.delete();
// }
// // initialize hotspot diagnostic MBean
// initHotspotMBean();
// try {
// hotspotMBean.dumpHeap(fileName, live);
// }
// catch (RuntimeException re) {
// throw re;
// }
// catch (Exception exp) {
// throw new RuntimeException(exp);
// }
// }
//
// // initialize the hotspot diagnostic MBean field
// private static void initHotspotMBean() {
// if (hotspotMBean == null) {
// synchronized (Object.class) {
// if (hotspotMBean == null) {
// hotspotMBean = getHotspotMBean();
// }
// }
// }
// }
//
// // get the hotspot diagnostic MBean from the
// // platform MBean server
// private static HotSpotDiagnosticMXBean getHotspotMBean() {
// try {
// MBeanServer server = ManagementFactory.getPlatformMBeanServer();
// HotSpotDiagnosticMXBean bean = ManagementFactory.newPlatformMXBeanProxy(server, HOTSPOT_BEAN_NAME,
// HotSpotDiagnosticMXBean.class);
// return bean;
// }
// catch (RuntimeException re) {
// throw re;
// }
// catch (Exception exp) {
// throw new RuntimeException(exp);
// }
// }
}