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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2019 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.osgi.framework.util;

import java.lang.management.LockInfo;
import java.lang.management.ManagementFactory;
import java.lang.management.MonitorInfo;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;

public class ThreadInfoReport extends RuntimeException {
	private static final long serialVersionUID = 1L;

	public ThreadInfoReport(String failedMonitor) {
		super(getThreadDump(failedMonitor));
	}

	public static String getThreadDump(String failedMonitor) {
		long currentId = Thread.currentThread().getId();
		ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
		StringBuilder dump = new StringBuilder("Thread dump"); //$NON-NLS-1$
		ThreadInfo[] infos = threadMXBean.dumpAllThreads(threadMXBean.isObjectMonitorUsageSupported(), threadMXBean.isSynchronizerUsageSupported());
		for (ThreadInfo info : infos) {
			dumpThreadIDNameState(info, dump);
			dumpLockInfo(currentId, failedMonitor, info, dump);
			dumpStackTrace(info, dump);
		}
		return dump.toString();
	}

	private static void dumpThreadIDNameState(ThreadInfo info, StringBuilder dump) {
		dump.append('\n').append('\n');
		dump.append("ThreadId: ").append(info.getThreadId()); //$NON-NLS-1$
		dump.append(" ThreadName: ").append(info.getThreadName()); //$NON-NLS-1$
		dump.append(" ThreadState: ").append(info.getThreadState()); //$NON-NLS-1$
	}

	private static void dumpLockInfo(long currentId, String failedMonitor, ThreadInfo info, StringBuilder dump) {
		dump.append('\n');
		dump.append("  Blocked On: "); //$NON-NLS-1$
		LockInfo blockedOn = info.getLockInfo();
		if (blockedOn == null) {
			if (currentId == info.getThreadId() && failedMonitor != null) {
				dump.append(failedMonitor);
			} else {
				dump.append("none"); //$NON-NLS-1$
			}
		} else {
			dump.append(blockedOn.toString());
			dump.append(" LockOwnerId: ").append(info.getLockOwnerId()); //$NON-NLS-1$
			dump.append(" LockOwnerName: ").append(info.getLockOwnerName()); //$NON-NLS-1$
		}
		dump.append('\n');

		dump.append("  Synchronizers Locked: "); //$NON-NLS-1$
		LockInfo[] synchronizers = info.getLockedSynchronizers();
		if (synchronizers.length == 0) {
			dump.append("none"); //$NON-NLS-1$
		} else {
			for (LockInfo sync : synchronizers) {
				dump.append('\n');
				dump.append("    ").append(sync.toString()); //$NON-NLS-1$
			}
		}
		dump.append('\n');

		dump.append("  Monitors Locked: "); //$NON-NLS-1$
		MonitorInfo[] monitors = info.getLockedMonitors();
		if (monitors.length == 0) {
			dump.append("none"); //$NON-NLS-1$
		}
		for (MonitorInfo monitor : monitors) {
			dump.append('\n');
			dump.append("    ").append(monitor.toString()); //$NON-NLS-1$
		}
		dump.append('\n');
	}

	private static void dumpStackTrace(ThreadInfo info, StringBuilder dump) {
		dump.append("  Stack Trace: "); //$NON-NLS-1$
		for (StackTraceElement e : info.getStackTrace()) {
			dump.append('\n').append("    ").append(e); //$NON-NLS-1$
		}
	}
}