mirror of
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896 lines
34 KiB
Java
896 lines
34 KiB
Java
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/* ThreadInfo.java - Information on a thread
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Copyright (C) 2006 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang.management;
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import java.util.Arrays;
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import javax.management.openmbean.ArrayType;
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import javax.management.openmbean.CompositeData;
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import javax.management.openmbean.CompositeType;
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import javax.management.openmbean.OpenDataException;
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import javax.management.openmbean.OpenType;
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import javax.management.openmbean.SimpleType;
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/**
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* <p>
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* A class which maintains information about a particular
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* thread. This information includes:
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* </p>
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* <ul>
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* <li><strong>General Thread Information:</strong>
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* <ul>
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* <li>The identifier of the thread.</li>
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* <li>The name of the thread.</li>
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* </ul>
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* </li>
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* <li><strong>Execution Information:</strong>
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* <ul>
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* <li>The current state of the thread (e.g. blocked, runnable)</li>
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* <li>The object upon which the thread is blocked, either because
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* the thread is waiting to obtain the monitor of that object to enter
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* one of its synchronized monitor, or because
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* {@link java.lang.Object#wait()} has been called while the thread
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* was within a method of that object.</li>
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* <li>The thread identifier of the current thread holding an object's
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* monitor, upon which the thread described here is blocked.</li>
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* <li>The stack trace of the thread (if requested on creation
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* of this object</li>
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* <li>The current locks held on object monitors by the thread.</li>
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* <li>The current locks held on ownable synchronizers by the thread.</li>
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* </ul>
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* <li><strong>Synchronization Statistics</strong>
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* <ul>
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* <li>The number of times the thread has been blocked waiting for
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* an object's monitor or in a {@link java.lang.Object#wait()} call.</li>
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* <li>The accumulated time the thread has been blocked waiting for
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* an object's monitor on in a {@link java.lang.Object#wait()} call.
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* The availability of these statistics depends on the virtual machine's
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* support for thread contention monitoring (see
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* {@link ThreadMXBean#isThreadContentionMonitoringSupported()}.</li>
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* </ul>
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* </li>
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* </ul>
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*
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* @author Andrew John Hughes (gnu_andrew@member.fsf.org)
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* @since 1.5
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* @see ThreadMXBean#isThreadContentionMonitoringSupported()
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*/
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public class ThreadInfo
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{
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/**
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* The id of the thread which this instance concerns.
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*/
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private long threadId;
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/**
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* The name of the thread which this instance concerns.
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*/
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private String threadName;
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/**
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* The state of the thread which this instance concerns.
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*/
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private Thread.State threadState;
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/**
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* The number of times the thread has been blocked.
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*/
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private long blockedCount;
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/**
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* The accumulated number of milliseconds the thread has
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* been blocked (used only with thread contention monitoring
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* support).
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*/
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private long blockedTime;
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/**
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* The name of the monitor lock on which this thread
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* is blocked (if any).
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*/
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private String lockName;
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/**
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* The id of the thread which owns the monitor lock on
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* which this thread is blocked, or <code>-1</code>
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* if there is no owner.
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*/
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private long lockOwnerId;
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/**
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* The name of the thread which owns the monitor lock on
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* which this thread is blocked, or <code>null</code>
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* if there is no owner.
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*/
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private String lockOwnerName;
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/**
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* The number of times the thread has been in a waiting
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* state.
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*/
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private long waitedCount;
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/**
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* The accumulated number of milliseconds the thread has
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* been waiting (used only with thread contention monitoring
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* support).
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*/
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private long waitedTime;
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/**
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* True if the thread is in a native method.
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*/
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private boolean isInNative;
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/**
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* True if the thread is suspended.
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*/
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private boolean isSuspended;
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/**
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* The stack trace of the thread.
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*/
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private StackTraceElement[] trace;
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/**
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* The array of information on monitors locked by the thread.
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*/
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private MonitorInfo[] lockedMonitors;
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/**
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* The array of information on ownable synchronizers locked
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* by the thread.
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*/
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private LockInfo[] lockedSynchronizers;
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/**
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* Cache a local reference to the thread management bean.
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*/
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private static ThreadMXBean bean = null;
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/**
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* Cache the {@link javax.management.openmbean.CompositeType}
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* for the {@link StackTraceElement}.
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*/
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private static CompositeType seType;
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/**
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* Constructs a new {@link ThreadInfo} corresponding
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* to the thread details specified.
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*
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* @param threadId the id of the thread on which this
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* new instance will be based.
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* @param threadName the name of the thread on which
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* this new instance will be based.
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* @param threadState the state of the thread on which
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* this new instance will be based.
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* @param blockedCount the number of times the thread
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* has been blocked.
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* @param blockedTime the accumulated number of milliseconds
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* the specified thread has been blocked
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* (only used with contention monitoring enabled)
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* @param lockName the name of the monitor lock the thread is waiting for
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* (only used if blocked)
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* @param lockOwnerId the id of the thread which owns the monitor
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* lock, or <code>-1</code> if it doesn't have an owner
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* (only used if blocked)
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* @param lockOwnerName the name of the thread which owns the monitor
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* lock, or <code>null</code> if it doesn't have an
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* owner (only used if blocked)
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* @param waitedCount the number of times the thread has been in a
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* waiting state.
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* @param waitedTime the accumulated number of milliseconds the
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* specified thread has been waiting
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* (only used with contention monitoring enabled)
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* @param isInNative true if the thread is in a native method.
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* @param isSuspended true if the thread is suspended.
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* @param trace the stack trace of the thread to a pre-determined
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* depth (see VMThreadMXBeanImpl)
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* @param lockedMonitors an array of {@link MonitorInfo} objects
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* representing locks held on object monitors
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* by the thread.
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* @param lockedSynchronizers an array of {@link LockInfo} objects
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* representing locks held on ownable
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* synchronizers by the thread.
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*
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* @since 1.6
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*/
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private ThreadInfo(long threadId, String threadName, Thread.State threadState,
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long blockedCount, long blockedTime, String lockName,
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long lockOwnerId, String lockOwnerName, long waitedCount,
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long waitedTime, boolean isInNative, boolean isSuspended,
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StackTraceElement[] trace, MonitorInfo[] lockedMonitors,
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LockInfo[] lockedSynchronizers)
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{
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this.threadId = threadId;
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this.threadName = threadName;
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this.threadState = threadState;
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this.blockedCount = blockedCount;
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this.blockedTime = blockedTime;
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this.lockName = lockName;
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this.lockOwnerId = lockOwnerId;
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this.lockOwnerName = lockOwnerName;
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this.waitedCount = waitedCount;
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this.waitedTime = waitedTime;
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this.isInNative = isInNative;
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this.isSuspended = isSuspended;
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this.trace = trace;
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this.lockedMonitors = lockedMonitors;
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this.lockedSynchronizers = lockedSynchronizers;
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}
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/**
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* Checks for an attribute in a {@link CompositeData} structure
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* with the correct type.
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*
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* @param ctype the composite data type to check.
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* @param name the name of the attribute.
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* @param type the type to check for.
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* @throws IllegalArgumentException if the attribute is absent
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* or of the wrong type.
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*/
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static void checkAttribute(CompositeType ctype, String name,
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OpenType type)
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throws IllegalArgumentException
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{
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OpenType foundType = ctype.getType(name);
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if (foundType == null)
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throw new IllegalArgumentException("Could not find a field named " +
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name);
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if (!(foundType.equals(type)))
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throw new IllegalArgumentException("Field " + name + " is not of " +
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"type " + type.getClassName());
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}
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/**
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* Returns the {@link javax.management.openmbean.CompositeType} for
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* a {@link StackTraceElement}.
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*
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* @return the type for the stack trace element.
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*/
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static CompositeType getStackTraceType()
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{
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if (seType == null)
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try
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{
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seType = new CompositeType(StackTraceElement.class.getName(),
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"An element of a stack trace",
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new String[] { "className", "methodName",
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"fileName", "lineNumber",
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"nativeMethod"
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},
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new String[] { "Name of the class",
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"Name of the method",
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"Name of the source code file",
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"Line number",
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"True if this is a native method"
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},
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new OpenType[] {
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SimpleType.STRING, SimpleType.STRING,
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SimpleType.STRING, SimpleType.INTEGER,
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SimpleType.BOOLEAN
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});
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}
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catch (OpenDataException e)
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{
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throw new IllegalStateException("Something went wrong in creating " +
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"the composite data type for the " +
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"stack trace element.", e);
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}
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return seType;
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}
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/**
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* <p>
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* Returns a {@link ThreadInfo} instance using the values
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* given in the supplied
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* {@link javax.management.openmbean.CompositeData} object.
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* The composite data instance should contain the following
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* attributes with the specified types:
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* </p>
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* <table>
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* <th><td>Name</td><td>Type</td></th>
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* <tr><td>threadId</td><td>java.lang.Long</td></tr>
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* <tr><td>threadName</td><td>java.lang.String</td></tr>
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* <tr><td>threadState</td><td>java.lang.String</td></tr>
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* <tr><td>suspended</td><td>java.lang.Boolean</td></tr>
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* <tr><td>inNative</td><td>java.lang.Boolean</td></tr>
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* <tr><td>blockedCount</td><td>java.lang.Long</td></tr>
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* <tr><td>blockedTime</td><td>java.lang.Long</td></tr>
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* <tr><td>waitedCount</td><td>java.lang.Long</td></tr>
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* <tr><td>waitedTime</td><td>java.lang.Long</td></tr>
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* <tr><td>lockName</td><td>java.lang.String</td></tr>
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* <tr><td>lockOwnerId</td><td>java.lang.Long</td></tr>
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* <tr><td>lockOwnerName</td><td>java.lang.String</td></tr>
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* <tr><td>stackTrace</td><td>javax.management.openmbean.CompositeData[]
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* </td></tr>
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* </table>
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* <p>
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* The stack trace is further described as:
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* </p>
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* <table>
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* <th><td>Name</td><td>Type</td></th>
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* <tr><td>className</td><td>java.lang.String</td></tr>
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* <tr><td>methodName</td><td>java.lang.String</td></tr>
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* <tr><td>fileName</td><td>java.lang.String</td></tr>
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* <tr><td>lineNumber</td><td>java.lang.Integer</td></tr>
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* <tr><td>nativeMethod</td><td>java.lang.Boolean</td></tr>
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* </table>
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*
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* @param data the composite data structure to take values from.
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* @return a new instance containing the values from the
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* composite data structure, or <code>null</code>
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* if the data structure was also <code>null</code>.
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* @throws IllegalArgumentException if the composite data structure
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* does not match the structure
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* outlined above.
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*/
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public static ThreadInfo from(CompositeData data)
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{
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if (data == null)
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return null;
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CompositeType type = data.getCompositeType();
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checkAttribute(type, "ThreadId", SimpleType.LONG);
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checkAttribute(type, "ThreadName", SimpleType.STRING);
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|
|
checkAttribute(type, "ThreadState", SimpleType.STRING);
|
||
|
|
checkAttribute(type, "Suspended", SimpleType.BOOLEAN);
|
||
|
|
checkAttribute(type, "InNative", SimpleType.BOOLEAN);
|
||
|
|
checkAttribute(type, "BlockedCount", SimpleType.LONG);
|
||
|
|
checkAttribute(type, "BlockedTime", SimpleType.LONG);
|
||
|
|
checkAttribute(type, "WaitedCount", SimpleType.LONG);
|
||
|
|
checkAttribute(type, "WaitedTime", SimpleType.LONG);
|
||
|
|
checkAttribute(type, "LockName", SimpleType.STRING);
|
||
|
|
checkAttribute(type, "LockOwnerId", SimpleType.LONG);
|
||
|
|
checkAttribute(type, "LockOwnerName", SimpleType.STRING);
|
||
|
|
try
|
||
|
|
{
|
||
|
|
checkAttribute(type, "StackTrace",
|
||
|
|
new ArrayType(1, getStackTraceType()));
|
||
|
|
}
|
||
|
|
catch (OpenDataException e)
|
||
|
|
{
|
||
|
|
throw new IllegalStateException("Something went wrong in creating " +
|
||
|
|
"the array for the stack trace element.",
|
||
|
|
e);
|
||
|
|
}
|
||
|
|
OpenType foundType = type.getType("LockedMonitors");
|
||
|
|
if (foundType != null)
|
||
|
|
try
|
||
|
|
{
|
||
|
|
CompositeType mType = new CompositeType(MonitorInfo.class.getName(),
|
||
|
|
"Information on a object monitor lock",
|
||
|
|
new String[] { "ClassName",
|
||
|
|
"IdentityHashCode",
|
||
|
|
"LockedStackDepth",
|
||
|
|
"LockedStackFrame"
|
||
|
|
},
|
||
|
|
new String[] { "Name of the class",
|
||
|
|
"Identity hash code " +
|
||
|
|
"of the class",
|
||
|
|
"Stack depth at time " +
|
||
|
|
"of lock",
|
||
|
|
"Stack frame at time " +
|
||
|
|
"of lock",
|
||
|
|
},
|
||
|
|
new OpenType[] {
|
||
|
|
SimpleType.STRING, SimpleType.INTEGER,
|
||
|
|
SimpleType.INTEGER, getStackTraceType()
|
||
|
|
});
|
||
|
|
if (!(foundType.equals(new ArrayType(1, mType))))
|
||
|
|
throw new IllegalArgumentException("Field LockedMonitors is not of " +
|
||
|
|
"type " + mType.getClassName());
|
||
|
|
}
|
||
|
|
catch (OpenDataException e)
|
||
|
|
{
|
||
|
|
throw new IllegalStateException("Something went wrong in creating " +
|
||
|
|
"the composite data type for the " +
|
||
|
|
"object monitor information array.", e);
|
||
|
|
}
|
||
|
|
foundType = type.getType("LockedSynchronizers");
|
||
|
|
if (foundType != null)
|
||
|
|
try
|
||
|
|
{
|
||
|
|
CompositeType lType = new CompositeType(LockInfo.class.getName(),
|
||
|
|
"Information on a lock",
|
||
|
|
new String[] { "ClassName",
|
||
|
|
"IdentityHashCode"
|
||
|
|
},
|
||
|
|
new String[] { "Name of the class",
|
||
|
|
"Identity hash code " +
|
||
|
|
"of the class"
|
||
|
|
},
|
||
|
|
new OpenType[] {
|
||
|
|
SimpleType.STRING, SimpleType.INTEGER
|
||
|
|
});
|
||
|
|
if (!(foundType.equals(new ArrayType(1, lType))))
|
||
|
|
throw new IllegalArgumentException("Field LockedSynchronizers is not of " +
|
||
|
|
"type " + lType.getClassName());
|
||
|
|
}
|
||
|
|
catch (OpenDataException e)
|
||
|
|
{
|
||
|
|
throw new IllegalStateException("Something went wrong in creating " +
|
||
|
|
"the composite data type for the " +
|
||
|
|
"ownable synchronizerinformation array.", e);
|
||
|
|
}
|
||
|
|
CompositeData[] dTraces = (CompositeData[]) data.get("StackTrace");
|
||
|
|
StackTraceElement[] traces = new StackTraceElement[dTraces.length];
|
||
|
|
for (int a = 0; a < dTraces.length; ++a)
|
||
|
|
/* FIXME: We can't use the boolean as there is no available
|
||
|
|
constructor. */
|
||
|
|
traces[a] =
|
||
|
|
new StackTraceElement((String) dTraces[a].get("ClassName"),
|
||
|
|
(String) dTraces[a].get("MethodName"),
|
||
|
|
(String) dTraces[a].get("FileName"),
|
||
|
|
((Integer)
|
||
|
|
dTraces[a].get("LineNumber")).intValue());
|
||
|
|
MonitorInfo[] mInfo;
|
||
|
|
if (data.containsKey("LockedMonitors"))
|
||
|
|
{
|
||
|
|
CompositeData[] dmInfos = (CompositeData[]) data.get("LockedMonitors");
|
||
|
|
mInfo = new MonitorInfo[dmInfos.length];
|
||
|
|
for (int a = 0; a < dmInfos.length; ++a)
|
||
|
|
mInfo[a] = MonitorInfo.from(dmInfos[a]);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
mInfo = new MonitorInfo[]{};
|
||
|
|
LockInfo[] lInfo;
|
||
|
|
if (data.containsKey("LockedSynchronizers"))
|
||
|
|
{
|
||
|
|
CompositeData[] dlInfos = (CompositeData[]) data.get("LockedSynchronizers");
|
||
|
|
lInfo = new LockInfo[dlInfos.length];
|
||
|
|
for (int a = 0; a < dlInfos.length; ++a)
|
||
|
|
lInfo[a] = new LockInfo((String) dlInfos[a].get("ClassName"),
|
||
|
|
(Integer) dlInfos[a].get("IdentityHashCode"));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
lInfo = new LockInfo[]{};
|
||
|
|
return new ThreadInfo(((Long) data.get("ThreadId")).longValue(),
|
||
|
|
(String) data.get("ThreadName"),
|
||
|
|
Thread.State.valueOf((String) data.get("ThreadState")),
|
||
|
|
((Long) data.get("BlockedCount")).longValue(),
|
||
|
|
((Long) data.get("BlockedTime")).longValue(),
|
||
|
|
(String) data.get("LockName"),
|
||
|
|
((Long) data.get("LockOwnerId")).longValue(),
|
||
|
|
(String) data.get("LockOwnerName"),
|
||
|
|
((Long) data.get("WaitedCount")).longValue(),
|
||
|
|
((Long) data.get("WaitedTime")).longValue(),
|
||
|
|
((Boolean) data.get("InNative")).booleanValue(),
|
||
|
|
((Boolean) data.get("Suspended")).booleanValue(),
|
||
|
|
traces, mInfo, lInfo);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the number of times this thread has been
|
||
|
|
* in the {@link java.lang.Thread.State#BLOCKED} state.
|
||
|
|
* A thread enters this state when it is waiting to
|
||
|
|
* obtain an object's monitor. This may occur either
|
||
|
|
* on entering a synchronized method for the first time,
|
||
|
|
* or on re-entering it following a call to
|
||
|
|
* {@link java.lang.Object#wait()}.
|
||
|
|
*
|
||
|
|
* @return the number of times this thread has been blocked.
|
||
|
|
*/
|
||
|
|
public long getBlockedCount()
|
||
|
|
{
|
||
|
|
return blockedCount;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Returns the accumulated number of milliseconds this
|
||
|
|
* thread has been in the
|
||
|
|
* {@link java.lang.Thread.State#BLOCKED} state
|
||
|
|
* since thread contention monitoring was last enabled.
|
||
|
|
* A thread enters this state when it is waiting to
|
||
|
|
* obtain an object's monitor. This may occur either
|
||
|
|
* on entering a synchronized method for the first time,
|
||
|
|
* or on re-entering it following a call to
|
||
|
|
* {@link java.lang.Object#wait()}.
|
||
|
|
* </p>
|
||
|
|
* <p>
|
||
|
|
* Use of this method requires virtual machine support
|
||
|
|
* for thread contention monitoring and for this support
|
||
|
|
* to be enabled.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @return the accumulated time (in milliseconds) that this
|
||
|
|
* thread has spent in the blocked state, since
|
||
|
|
* thread contention monitoring was enabled, or -1
|
||
|
|
* if thread contention monitoring is disabled.
|
||
|
|
* @throws UnsupportedOperationException if the virtual
|
||
|
|
* machine does not
|
||
|
|
* support contention
|
||
|
|
* monitoring.
|
||
|
|
* @see ThreadMXBean#isThreadContentionMonitoringEnabled()
|
||
|
|
* @see ThreadMXBean#isThreadContentionMonitoringSupported()
|
||
|
|
*/
|
||
|
|
public long getBlockedTime()
|
||
|
|
{
|
||
|
|
if (bean == null)
|
||
|
|
bean = ManagementFactory.getThreadMXBean();
|
||
|
|
// Will throw UnsupportedOperationException for us
|
||
|
|
if (bean.isThreadContentionMonitoringEnabled())
|
||
|
|
return blockedTime;
|
||
|
|
else
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns an array of {@link MonitorInfo} objects representing
|
||
|
|
* information on the locks on object monitors held by the thread.
|
||
|
|
* If no locks are held, or such information was not requested
|
||
|
|
* on creating this {@link ThreadInfo} object, a zero-length
|
||
|
|
* array will be returned.
|
||
|
|
*
|
||
|
|
* @return information on object monitors locked by this thread.
|
||
|
|
*/
|
||
|
|
public MonitorInfo[] getLockedMonitors()
|
||
|
|
{
|
||
|
|
return lockedMonitors;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns an array of {@link LockInfo} objects representing
|
||
|
|
* information on the locks on ownable synchronizers held by the thread.
|
||
|
|
* If no locks are held, or such information was not requested
|
||
|
|
* on creating this {@link ThreadInfo} object, a zero-length
|
||
|
|
* array will be returned.
|
||
|
|
*
|
||
|
|
* @return information on ownable synchronizers locked by this thread.
|
||
|
|
*/
|
||
|
|
public LockInfo[] getLockedSynchronizers()
|
||
|
|
{
|
||
|
|
return lockedSynchronizers;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Returns a {@link LockInfo} object representing the
|
||
|
|
* lock on which this thread is blocked. If the thread
|
||
|
|
* is not blocked, this method returns <code>null</code>.
|
||
|
|
* </p>
|
||
|
|
* <p>
|
||
|
|
* The thread may be blocked due to one of three reasons:
|
||
|
|
* </p>
|
||
|
|
* <ol>
|
||
|
|
* <li>The thread is in the <code>BLOCKED</code> state
|
||
|
|
* waiting to acquire an object monitor in order to enter
|
||
|
|
* a synchronized method or block.</li>
|
||
|
|
* <li>The thread is in the <code>WAITING</code> or
|
||
|
|
* <code>TIMED_WAITING</code> state due to a call to
|
||
|
|
* {@link java.lang.Object#wait()}.</li>
|
||
|
|
* <li>The thread is in the <code>WAITING</code> or
|
||
|
|
* <code>TIMED_WAITING</code> state due to a call
|
||
|
|
* to {@link java.util.concurrent.locks.LockSupport#park()}.
|
||
|
|
* The lock is the return value of
|
||
|
|
* {@link java.util.concurrent.locks.LockSupport#getBlocker()}.</li>
|
||
|
|
* </ol>
|
||
|
|
*
|
||
|
|
* @return a {@link LockInfo} object representing the lock on
|
||
|
|
* which the thread is blocked, or <code>null</code> if
|
||
|
|
* the thread isn't blocked.
|
||
|
|
* @since 1.6
|
||
|
|
* @see #getLockName()
|
||
|
|
*/
|
||
|
|
public LockInfo getLockInfo()
|
||
|
|
{
|
||
|
|
String lockName = getLockName();
|
||
|
|
int at = lockName.indexOf('@');
|
||
|
|
return new LockInfo(lockName.substring(0, at),
|
||
|
|
Integer.decode(lockName.substring(at + 1)));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Returns a {@link java.lang.String} representation of
|
||
|
|
* the lock on which this thread is blocked. If
|
||
|
|
* the thread is not blocked, this method returns
|
||
|
|
* <code>null</code>.
|
||
|
|
* </p>
|
||
|
|
* <p>
|
||
|
|
* The returned {@link java.lang.String} is constructed
|
||
|
|
* using the class name and identity hashcode (usually
|
||
|
|
* the memory address of the object) of the lock. The
|
||
|
|
* two are separated by the '@' character, and the identity
|
||
|
|
* hashcode is represented in hexadecimal. Thus, for a
|
||
|
|
* lock, <code>l</code>, the returned value is
|
||
|
|
* the result of concatenating
|
||
|
|
* <code>l.getClass().getName()</code>, <code>"@"</code>
|
||
|
|
* and
|
||
|
|
* <code>Integer.toHexString(System.identityHashCode(l))</code>.
|
||
|
|
* The value is only unique to the extent that the identity
|
||
|
|
* hash code is also unique. The value is the same as would
|
||
|
|
* be returned by <code>getLockInfo().toString()</code>
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @return a string representing the lock on which this
|
||
|
|
* thread is blocked, or <code>null</code> if
|
||
|
|
* the thread is not blocked.
|
||
|
|
*/
|
||
|
|
public String getLockName()
|
||
|
|
{
|
||
|
|
if (!isThreadBlocked())
|
||
|
|
return null;
|
||
|
|
return lockName;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the identifier of the thread which owns the
|
||
|
|
* monitor lock this thread is waiting for. -1 is returned
|
||
|
|
* if either this thread is not blocked, or the lock is
|
||
|
|
* not held by any other thread.
|
||
|
|
*
|
||
|
|
* @return the thread identifier of thread holding the lock
|
||
|
|
* this thread is waiting for, or -1 if the thread
|
||
|
|
* is not blocked or the lock is not held by another
|
||
|
|
* thread.
|
||
|
|
*/
|
||
|
|
public long getLockOwnerId()
|
||
|
|
{
|
||
|
|
if (!isThreadBlocked())
|
||
|
|
return -1;
|
||
|
|
return lockOwnerId;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the name of the thread which owns the
|
||
|
|
* monitor lock this thread is waiting for. <code>null</code>
|
||
|
|
* is returned if either this thread is not blocked,
|
||
|
|
* or the lock is not held by any other thread.
|
||
|
|
*
|
||
|
|
* @return the thread identifier of thread holding the lock
|
||
|
|
* this thread is waiting for, or <code>null</code>
|
||
|
|
* if the thread is not blocked or the lock is not
|
||
|
|
* held by another thread.
|
||
|
|
*/
|
||
|
|
public String getLockOwnerName()
|
||
|
|
{
|
||
|
|
if (!isThreadBlocked())
|
||
|
|
return null;
|
||
|
|
return lockOwnerName;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Returns the stack trace of this thread to the depth
|
||
|
|
* specified on creation of this {@link ThreadInfo}
|
||
|
|
* object. If the depth is zero, an empty array will
|
||
|
|
* be returned. For non-zero arrays, the elements
|
||
|
|
* start with the most recent trace at position zero.
|
||
|
|
* The bottom of the stack represents the oldest method
|
||
|
|
* invocation which meets the depth requirements.
|
||
|
|
* </p>
|
||
|
|
* <p>
|
||
|
|
* Some virtual machines may not be able to return
|
||
|
|
* stack trace information for a thread. In these
|
||
|
|
* cases, an empty array will also be returned.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @return an array of {@link java.lang.StackTraceElement}s
|
||
|
|
* representing the trace of this thread.
|
||
|
|
*/
|
||
|
|
public StackTraceElement[] getStackTrace()
|
||
|
|
{
|
||
|
|
return trace;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the identifier of the thread associated with
|
||
|
|
* this instance of {@link ThreadInfo}.
|
||
|
|
*
|
||
|
|
* @return the thread's identifier.
|
||
|
|
*/
|
||
|
|
public long getThreadId()
|
||
|
|
{
|
||
|
|
return threadId;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the name of the thread associated with
|
||
|
|
* this instance of {@link ThreadInfo}.
|
||
|
|
*
|
||
|
|
* @return the thread's name.
|
||
|
|
*/
|
||
|
|
public String getThreadName()
|
||
|
|
{
|
||
|
|
return threadName;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the state of the thread associated with
|
||
|
|
* this instance of {@link ThreadInfo}.
|
||
|
|
*
|
||
|
|
* @return the thread's state.
|
||
|
|
*/
|
||
|
|
public Thread.State getThreadState()
|
||
|
|
{
|
||
|
|
return threadState;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns the number of times this thread has been
|
||
|
|
* in the {@link java.lang.Thread.State#WAITING}
|
||
|
|
* or {@link java.lang.Thread.State#TIMED_WAITING} state.
|
||
|
|
* A thread enters one of these states when it is waiting
|
||
|
|
* due to a call to {@link java.lang.Object.wait()},
|
||
|
|
* {@link java.lang.Object.join()} or
|
||
|
|
* {@link java.lang.concurrent.locks.LockSupport.park()},
|
||
|
|
* either with an infinite or timed delay, respectively.
|
||
|
|
*
|
||
|
|
* @return the number of times this thread has been waiting.
|
||
|
|
*/
|
||
|
|
public long getWaitedCount()
|
||
|
|
{
|
||
|
|
return waitedCount;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Returns the accumulated number of milliseconds this
|
||
|
|
* thread has been in the
|
||
|
|
* {@link java.lang.Thread.State#WAITING} or
|
||
|
|
* {@link java.lang.Thread.State#TIMED_WAITING} state,
|
||
|
|
* since thread contention monitoring was last enabled.
|
||
|
|
* A thread enters one of these states when it is waiting
|
||
|
|
* due to a call to {@link java.lang.Object.wait()},
|
||
|
|
* {@link java.lang.Object.join()} or
|
||
|
|
* {@link java.lang.concurrent.locks.LockSupport.park()},
|
||
|
|
* either with an infinite or timed delay, respectively.
|
||
|
|
* </p>
|
||
|
|
* <p>
|
||
|
|
* Use of this method requires virtual machine support
|
||
|
|
* for thread contention monitoring and for this support
|
||
|
|
* to be enabled.
|
||
|
|
* </p>
|
||
|
|
*
|
||
|
|
* @return the accumulated time (in milliseconds) that this
|
||
|
|
* thread has spent in one of the waiting states, since
|
||
|
|
* thread contention monitoring was enabled, or -1
|
||
|
|
* if thread contention monitoring is disabled.
|
||
|
|
* @throws UnsupportedOperationException if the virtual
|
||
|
|
* machine does not
|
||
|
|
* support contention
|
||
|
|
* monitoring.
|
||
|
|
* @see ThreadMXBean#isThreadContentionMonitoringEnabled()
|
||
|
|
* @see ThreadMXBean#isThreadContentionMonitoringSupported()
|
||
|
|
*/
|
||
|
|
public long getWaitedTime()
|
||
|
|
{
|
||
|
|
if (bean == null)
|
||
|
|
bean = ManagementFactory.getThreadMXBean();
|
||
|
|
// Will throw UnsupportedOperationException for us
|
||
|
|
if (bean.isThreadContentionMonitoringEnabled())
|
||
|
|
return waitedTime;
|
||
|
|
else
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns true if the thread is in a native method. This
|
||
|
|
* excludes native code which forms part of the virtual
|
||
|
|
* machine itself, or which results from Just-In-Time
|
||
|
|
* compilation.
|
||
|
|
*
|
||
|
|
* @return true if the thread is in a native method, false
|
||
|
|
* otherwise.
|
||
|
|
*/
|
||
|
|
public boolean isInNative()
|
||
|
|
{
|
||
|
|
return isInNative;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns true if the thread has been suspended using
|
||
|
|
* {@link java.lang.Thread#suspend()}.
|
||
|
|
*
|
||
|
|
* @return true if the thread is suspended, false otherwise.
|
||
|
|
*/
|
||
|
|
public boolean isSuspended()
|
||
|
|
{
|
||
|
|
return isSuspended;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns a {@link java.lang.String} representation of
|
||
|
|
* this {@link ThreadInfo} object. This takes the form
|
||
|
|
* <code>java.lang.management.ThreadInfo[id=tid, name=n,
|
||
|
|
* state=s, blockedCount=bc, waitedCount=wc, isInNative=iin,
|
||
|
|
* isSuspended=is]</code>, where <code>tid</code> is
|
||
|
|
* the thread identifier, <code>n</code> is the
|
||
|
|
* thread name, <code>s</code> is the thread state,
|
||
|
|
* <code>bc</code> is the blocked state count,
|
||
|
|
* <code>wc</code> is the waiting state count and
|
||
|
|
* <code>iin</code> and <code>is</code> are boolean
|
||
|
|
* flags to indicate the thread is in native code or
|
||
|
|
* suspended respectively. If the thread is blocked,
|
||
|
|
* <code>lock=l, lockOwner=lo</code> is also included,
|
||
|
|
* where <code>l</code> is the lock waited for, and
|
||
|
|
* <code>lo</code> is the thread which owns the lock
|
||
|
|
* (or null if there is no owner).
|
||
|
|
*
|
||
|
|
* @return the string specified above.
|
||
|
|
*/
|
||
|
|
public String toString()
|
||
|
|
{
|
||
|
|
return getClass().getName() +
|
||
|
|
"[id=" + threadId +
|
||
|
|
", name=" + threadName +
|
||
|
|
", state=" + threadState +
|
||
|
|
", blockedCount=" + blockedCount +
|
||
|
|
", waitedCount=" + waitedCount +
|
||
|
|
", isInNative=" + isInNative +
|
||
|
|
", isSuspended=" + isSuspended +
|
||
|
|
(isThreadBlocked() ?
|
||
|
|
", lockOwnerId=" + lockOwnerId +
|
||
|
|
", lockOwnerName=" + lockOwnerName : "") +
|
||
|
|
", lockedMonitors=" + Arrays.toString(lockedMonitors) +
|
||
|
|
", lockedSynchronizers=" + Arrays.toString(lockedSynchronizers) +
|
||
|
|
"]";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* <p>
|
||
|
|
* Returns true if the thread is in a blocked state.
|
||
|
|
* The thread is regarded as blocked if:
|
||
|
|
* </p>
|
||
|
|
* <ol>
|
||
|
|
* <li>The thread is in the <code>BLOCKED</code> state
|
||
|
|
* waiting to acquire an object monitor in order to enter
|
||
|
|
* a synchronized method or block.</li>
|
||
|
|
* <li>The thread is in the <code>WAITING</code> or
|
||
|
|
* <code>TIMED_WAITING</code> state due to a call to
|
||
|
|
* {@link java.lang.Object#wait()}.</li>
|
||
|
|
* <li>The thread is in the <code>WAITING</code> or
|
||
|
|
* <code>TIMED_WAITING</code> state due to a call
|
||
|
|
* to {@link java.util.concurrent.locks.LockSupport#park()}.
|
||
|
|
* The lock is the return value of
|
||
|
|
* {@link java.util.concurrent.locks.LockSupport#getBlocker()}.</li>
|
||
|
|
* </ol>
|
||
|
|
*
|
||
|
|
* @return true if the thread is blocked.
|
||
|
|
*/
|
||
|
|
private boolean isThreadBlocked()
|
||
|
|
{
|
||
|
|
return (threadState == Thread.State.BLOCKED ||
|
||
|
|
threadState == Thread.State.WAITING ||
|
||
|
|
threadState == Thread.State.TIMED_WAITING);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|