--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.management/share/classes/java/lang/management/ThreadInfo.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,902 @@
+/*
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.lang.management;
+
+import javax.management.openmbean.CompositeData;
+import sun.management.ManagementFactoryHelper;
+import sun.management.ThreadInfoCompositeData;
+import static java.lang.Thread.State.*;
+
+/**
+ * Thread information. {@code ThreadInfo} contains the information
+ * about a thread including:
+ * <h3>General thread information</h3>
+ * <ul>
+ * <li>Thread ID.</li>
+ * <li>Name of the thread.</li>
+ * <li>Whether a thread is a daemon thread</li>
+ * </ul>
+ *
+ * <h3>Execution information</h3>
+ * <ul>
+ * <li>Thread state.</li>
+ * <li>The object upon which the thread is blocked due to:
+ * <ul>
+ * <li>waiting to enter a synchronization block/method, or</li>
+ * <li>waiting to be notified in a {@link Object#wait Object.wait} method,
+ * or</li>
+ * <li>parking due to a {@link java.util.concurrent.locks.LockSupport#park
+ * LockSupport.park} call.</li>
+ * </ul>
+ * </li>
+ * <li>The ID of the thread that owns the object
+ * that the thread is blocked.</li>
+ * <li>Stack trace of the thread.</li>
+ * <li>List of object monitors locked by the thread.</li>
+ * <li>List of <a href="LockInfo.html#OwnableSynchronizer">
+ * ownable synchronizers</a> locked by the thread.</li>
+ * <li>Thread priority</li>
+ * </ul>
+ *
+ * <h4><a id="SyncStats">Synchronization Statistics</a></h4>
+ * <ul>
+ * <li>The number of times that the thread has blocked for
+ * synchronization or waited for notification.</li>
+ * <li>The accumulated elapsed time that the thread has blocked
+ * for synchronization or waited for notification
+ * since {@link ThreadMXBean#setThreadContentionMonitoringEnabled
+ * thread contention monitoring}
+ * was enabled. Some Java virtual machine implementation
+ * may not support this. The
+ * {@link ThreadMXBean#isThreadContentionMonitoringSupported()}
+ * method can be used to determine if a Java virtual machine
+ * supports this.</li>
+ * </ul>
+ *
+ * <p>This thread information class is designed for use in monitoring of
+ * the system, not for synchronization control.
+ *
+ * <h4>MXBean Mapping</h4>
+ * {@code ThreadInfo} is mapped to a {@link CompositeData CompositeData}
+ * with attributes as specified in
+ * the {@link #from from} method.
+ *
+ * @see ThreadMXBean#getThreadInfo
+ * @see ThreadMXBean#dumpAllThreads
+ *
+ * @author Mandy Chung
+ * @since 1.5
+ */
+
+public class ThreadInfo {
+ private String threadName;
+ private long threadId;
+ private long blockedTime;
+ private long blockedCount;
+ private long waitedTime;
+ private long waitedCount;
+ private LockInfo lock;
+ private String lockName;
+ private long lockOwnerId;
+ private String lockOwnerName;
+ private boolean daemon;
+ private boolean inNative;
+ private boolean suspended;
+ private Thread.State threadState;
+ private int priority;
+ private StackTraceElement[] stackTrace;
+ private MonitorInfo[] lockedMonitors;
+ private LockInfo[] lockedSynchronizers;
+
+ private static MonitorInfo[] EMPTY_MONITORS = new MonitorInfo[0];
+ private static LockInfo[] EMPTY_SYNCS = new LockInfo[0];
+
+ /**
+ * Constructor of ThreadInfo created by the JVM
+ *
+ * @param t Thread
+ * @param state Thread state
+ * @param lockObj Object on which the thread is blocked
+ * @param lockOwner the thread holding the lock
+ * @param blockedCount Number of times blocked to enter a lock
+ * @param blockedTime Approx time blocked to enter a lock
+ * @param waitedCount Number of times waited on a lock
+ * @param waitedTime Approx time waited on a lock
+ * @param stackTrace Thread stack trace
+ */
+ private ThreadInfo(Thread t, int state, Object lockObj, Thread lockOwner,
+ long blockedCount, long blockedTime,
+ long waitedCount, long waitedTime,
+ StackTraceElement[] stackTrace) {
+ initialize(t, state, lockObj, lockOwner,
+ blockedCount, blockedTime,
+ waitedCount, waitedTime, stackTrace,
+ EMPTY_MONITORS, EMPTY_SYNCS);
+ }
+
+ /**
+ * Constructor of ThreadInfo created by the JVM
+ * for {@link ThreadMXBean#getThreadInfo(long[],boolean,boolean)}
+ * and {@link ThreadMXBean#dumpAllThreads}
+ *
+ * @param t Thread
+ * @param state Thread state
+ * @param lockObj Object on which the thread is blocked
+ * @param lockOwner the thread holding the lock
+ * @param blockedCount Number of times blocked to enter a lock
+ * @param blockedTime Approx time blocked to enter a lock
+ * @param waitedCount Number of times waited on a lock
+ * @param waitedTime Approx time waited on a lock
+ * @param stackTrace Thread stack trace
+ * @param monitors List of locked monitors
+ * @param stackDepths List of stack depths
+ * @param synchronizers List of locked synchronizers
+ */
+ private ThreadInfo(Thread t, int state, Object lockObj, Thread lockOwner,
+ long blockedCount, long blockedTime,
+ long waitedCount, long waitedTime,
+ StackTraceElement[] stackTrace,
+ Object[] monitors,
+ int[] stackDepths,
+ Object[] synchronizers) {
+ int numMonitors = (monitors == null ? 0 : monitors.length);
+ MonitorInfo[] lockedMonitors;
+ if (numMonitors == 0) {
+ lockedMonitors = EMPTY_MONITORS;
+ } else {
+ lockedMonitors = new MonitorInfo[numMonitors];
+ for (int i = 0; i < numMonitors; i++) {
+ Object lock = monitors[i];
+ String className = lock.getClass().getName();
+ int identityHashCode = System.identityHashCode(lock);
+ int depth = stackDepths[i];
+ StackTraceElement ste = (depth >= 0 ? stackTrace[depth]
+ : null);
+ lockedMonitors[i] = new MonitorInfo(className,
+ identityHashCode,
+ depth,
+ ste);
+ }
+ }
+
+ int numSyncs = (synchronizers == null ? 0 : synchronizers.length);
+ LockInfo[] lockedSynchronizers;
+ if (numSyncs == 0) {
+ lockedSynchronizers = EMPTY_SYNCS;
+ } else {
+ lockedSynchronizers = new LockInfo[numSyncs];
+ for (int i = 0; i < numSyncs; i++) {
+ Object lock = synchronizers[i];
+ String className = lock.getClass().getName();
+ int identityHashCode = System.identityHashCode(lock);
+ lockedSynchronizers[i] = new LockInfo(className,
+ identityHashCode);
+ }
+ }
+
+ initialize(t, state, lockObj, lockOwner,
+ blockedCount, blockedTime,
+ waitedCount, waitedTime, stackTrace,
+ lockedMonitors, lockedSynchronizers);
+ }
+
+ /**
+ * Initialize ThreadInfo object
+ *
+ * @param t Thread
+ * @param state Thread state
+ * @param lockObj Object on which the thread is blocked
+ * @param lockOwner the thread holding the lock
+ * @param blockedCount Number of times blocked to enter a lock
+ * @param blockedTime Approx time blocked to enter a lock
+ * @param waitedCount Number of times waited on a lock
+ * @param waitedTime Approx time waited on a lock
+ * @param stackTrace Thread stack trace
+ * @param lockedMonitors List of locked monitors
+ * @param lockedSynchronizers List of locked synchronizers
+ */
+ private void initialize(Thread t, int state, Object lockObj, Thread lockOwner,
+ long blockedCount, long blockedTime,
+ long waitedCount, long waitedTime,
+ StackTraceElement[] stackTrace,
+ MonitorInfo[] lockedMonitors,
+ LockInfo[] lockedSynchronizers) {
+ this.threadId = t.getId();
+ this.threadName = t.getName();
+ this.threadState = ManagementFactoryHelper.toThreadState(state);
+ this.suspended = ManagementFactoryHelper.isThreadSuspended(state);
+ this.inNative = ManagementFactoryHelper.isThreadRunningNative(state);
+ this.blockedCount = blockedCount;
+ this.blockedTime = blockedTime;
+ this.waitedCount = waitedCount;
+ this.waitedTime = waitedTime;
+ this.daemon = t.isDaemon();
+ this.priority = t.getPriority();
+
+ if (lockObj == null) {
+ this.lock = null;
+ this.lockName = null;
+ } else {
+ this.lock = new LockInfo(lockObj);
+ this.lockName =
+ lock.getClassName() + '@' +
+ Integer.toHexString(lock.getIdentityHashCode());
+ }
+ if (lockOwner == null) {
+ this.lockOwnerId = -1;
+ this.lockOwnerName = null;
+ } else {
+ this.lockOwnerId = lockOwner.getId();
+ this.lockOwnerName = lockOwner.getName();
+ }
+ if (stackTrace == null) {
+ this.stackTrace = NO_STACK_TRACE;
+ } else {
+ this.stackTrace = stackTrace;
+ }
+ this.lockedMonitors = lockedMonitors;
+ this.lockedSynchronizers = lockedSynchronizers;
+ }
+
+ /*
+ * Constructs a {@code ThreadInfo} object from a
+ * {@link CompositeData CompositeData}.
+ */
+ private ThreadInfo(CompositeData cd) {
+ ThreadInfoCompositeData ticd = ThreadInfoCompositeData.getInstance(cd);
+
+ threadId = ticd.threadId();
+ threadName = ticd.threadName();
+ blockedTime = ticd.blockedTime();
+ blockedCount = ticd.blockedCount();
+ waitedTime = ticd.waitedTime();
+ waitedCount = ticd.waitedCount();
+ lockName = ticd.lockName();
+ lockOwnerId = ticd.lockOwnerId();
+ lockOwnerName = ticd.lockOwnerName();
+ threadState = ticd.threadState();
+ suspended = ticd.suspended();
+ inNative = ticd.inNative();
+ stackTrace = ticd.stackTrace();
+
+ // 6.0 attributes
+ if (ticd.hasV6()) {
+ lock = ticd.lockInfo();
+ lockedMonitors = ticd.lockedMonitors();
+ lockedSynchronizers = ticd.lockedSynchronizers();
+ } else {
+ // lockInfo is a new attribute added in 1.6 ThreadInfo
+ // If cd is a 5.0 version, construct the LockInfo object
+ // from the lockName value.
+ if (lockName != null) {
+ String result[] = lockName.split("@");
+ if (result.length == 2) {
+ int identityHashCode = Integer.parseInt(result[1], 16);
+ lock = new LockInfo(result[0], identityHashCode);
+ } else {
+ assert result.length == 2;
+ lock = null;
+ }
+ } else {
+ lock = null;
+ }
+ lockedMonitors = EMPTY_MONITORS;
+ lockedSynchronizers = EMPTY_SYNCS;
+ }
+
+ // 9.0 attributes
+ if (ticd.isCurrentVersion()) {
+ daemon = ticd.isDaemon();
+ priority = ticd.getPriority();
+ } else {
+ // Not ideal, but unclear what else we can do.
+ daemon = false;
+ priority = Thread.NORM_PRIORITY;
+ }
+ }
+
+ /**
+ * Returns the ID of the thread associated with this {@code ThreadInfo}.
+ *
+ * @return the ID of the associated thread.
+ */
+ public long getThreadId() {
+ return threadId;
+ }
+
+ /**
+ * Returns the name of the thread associated with this {@code ThreadInfo}.
+ *
+ * @return the name of the associated thread.
+ */
+ public String getThreadName() {
+ return threadName;
+ }
+
+ /**
+ * Returns the state of the thread associated with this {@code ThreadInfo}.
+ *
+ * @return {@code Thread.State} of the associated thread.
+ */
+ public Thread.State getThreadState() {
+ return threadState;
+ }
+
+ /**
+ * Returns the approximate accumulated elapsed time (in milliseconds)
+ * that the thread associated with this {@code ThreadInfo}
+ * has blocked to enter or reenter a monitor
+ * since thread contention monitoring is enabled.
+ * I.e. the total accumulated time the thread has been in the
+ * {@link java.lang.Thread.State#BLOCKED BLOCKED} state since thread
+ * contention monitoring was last enabled.
+ * This method returns {@code -1} if thread contention monitoring
+ * is disabled.
+ *
+ * <p>The Java virtual machine may measure the time with a high
+ * resolution timer. This statistic is reset when
+ * the thread contention monitoring is reenabled.
+ *
+ * @return the approximate accumulated elapsed time in milliseconds
+ * that a thread entered the {@code BLOCKED} state;
+ * {@code -1} if thread contention monitoring is disabled.
+ *
+ * @throws java.lang.UnsupportedOperationException if the Java
+ * virtual machine does not support this operation.
+ *
+ * @see ThreadMXBean#isThreadContentionMonitoringSupported
+ * @see ThreadMXBean#setThreadContentionMonitoringEnabled
+ */
+ public long getBlockedTime() {
+ return blockedTime;
+ }
+
+ /**
+ * Returns the total number of times that
+ * the thread associated with this {@code ThreadInfo}
+ * blocked to enter or reenter a monitor.
+ * I.e. the number of times a thread has been in the
+ * {@link java.lang.Thread.State#BLOCKED BLOCKED} state.
+ *
+ * @return the total number of times that the thread
+ * entered the {@code BLOCKED} state.
+ */
+ public long getBlockedCount() {
+ return blockedCount;
+ }
+
+ /**
+ * Returns the approximate accumulated elapsed time (in milliseconds)
+ * that the thread associated with this {@code ThreadInfo}
+ * has waited for notification
+ * since thread contention monitoring is enabled.
+ * I.e. the total accumulated time the thread has been in the
+ * {@link java.lang.Thread.State#WAITING WAITING}
+ * or {@link java.lang.Thread.State#TIMED_WAITING TIMED_WAITING} state
+ * since thread contention monitoring is enabled.
+ * This method returns {@code -1} if thread contention monitoring
+ * is disabled.
+ *
+ * <p>The Java virtual machine may measure the time with a high
+ * resolution timer. This statistic is reset when
+ * the thread contention monitoring is reenabled.
+ *
+ * @return the approximate accumulated elapsed time in milliseconds
+ * that a thread has been in the {@code WAITING} or
+ * {@code TIMED_WAITING} state;
+ * {@code -1} if thread contention monitoring is disabled.
+ *
+ * @throws java.lang.UnsupportedOperationException if the Java
+ * virtual machine does not support this operation.
+ *
+ * @see ThreadMXBean#isThreadContentionMonitoringSupported
+ * @see ThreadMXBean#setThreadContentionMonitoringEnabled
+ */
+ public long getWaitedTime() {
+ return waitedTime;
+ }
+
+ /**
+ * Returns the total number of times that
+ * the thread associated with this {@code ThreadInfo}
+ * waited for notification.
+ * I.e. the number of times that a thread has been
+ * in the {@link java.lang.Thread.State#WAITING WAITING}
+ * or {@link java.lang.Thread.State#TIMED_WAITING TIMED_WAITING} state.
+ *
+ * @return the total number of times that the thread
+ * was in the {@code WAITING} or {@code TIMED_WAITING} state.
+ */
+ public long getWaitedCount() {
+ return waitedCount;
+ }
+
+ /**
+ * Returns the {@code LockInfo} of an object for which
+ * the thread associated with this {@code ThreadInfo}
+ * is blocked waiting.
+ * A thread can be blocked waiting for one of the following:
+ * <ul>
+ * <li>an object monitor to be acquired for entering or reentering
+ * a synchronization block/method.
+ * <br>The thread is in the {@link java.lang.Thread.State#BLOCKED BLOCKED}
+ * state waiting to enter the {@code synchronized} statement
+ * or method.
+ * </li>
+ * <li>an object monitor to be notified by another thread.
+ * <br>The thread is in the {@link java.lang.Thread.State#WAITING WAITING}
+ * or {@link java.lang.Thread.State#TIMED_WAITING TIMED_WAITING} state
+ * due to a call to the {@link Object#wait Object.wait} method.
+ * </li>
+ * <li>a synchronization object responsible for the thread parking.
+ * <br>The thread is in the {@link java.lang.Thread.State#WAITING WAITING}
+ * or {@link java.lang.Thread.State#TIMED_WAITING TIMED_WAITING} state
+ * due to a call to the
+ * {@link java.util.concurrent.locks.LockSupport#park(Object)
+ * LockSupport.park} method. The synchronization object
+ * is the object returned from
+ * {@link java.util.concurrent.locks.LockSupport#getBlocker
+ * LockSupport.getBlocker} method. Typically it is an
+ * <a href="LockInfo.html#OwnableSynchronizer"> ownable synchronizer</a>
+ * or a {@link java.util.concurrent.locks.Condition Condition}.</li>
+ * </ul>
+ *
+ * <p>This method returns {@code null} if the thread is not in any of
+ * the above conditions.
+ *
+ * @return {@code LockInfo} of an object for which the thread
+ * is blocked waiting if any; {@code null} otherwise.
+ * @since 1.6
+ */
+ public LockInfo getLockInfo() {
+ return lock;
+ }
+
+ /**
+ * Returns the {@link LockInfo#toString string representation}
+ * of an object for which the thread associated with this
+ * {@code ThreadInfo} is blocked waiting.
+ * This method is equivalent to calling:
+ * <blockquote>
+ * <pre>
+ * getLockInfo().toString()
+ * </pre></blockquote>
+ *
+ * <p>This method will return {@code null} if this thread is not blocked
+ * waiting for any object or if the object is not owned by any thread.
+ *
+ * @return the string representation of the object on which
+ * the thread is blocked if any;
+ * {@code null} otherwise.
+ *
+ * @see #getLockInfo
+ */
+ public String getLockName() {
+ return lockName;
+ }
+
+ /**
+ * Returns the ID of the thread which owns the object
+ * for which the thread associated with this {@code ThreadInfo}
+ * is blocked waiting.
+ * This method will return {@code -1} if this thread is not blocked
+ * waiting for any object or if the object is not owned by any thread.
+ *
+ * @return the thread ID of the owner thread of the object
+ * this thread is blocked on;
+ * {@code -1} if this thread is not blocked
+ * or if the object is not owned by any thread.
+ *
+ * @see #getLockInfo
+ */
+ public long getLockOwnerId() {
+ return lockOwnerId;
+ }
+
+ /**
+ * Returns the name of the thread which owns the object
+ * for which the thread associated with this {@code ThreadInfo}
+ * is blocked waiting.
+ * This method will return {@code null} if this thread is not blocked
+ * waiting for any object or if the object is not owned by any thread.
+ *
+ * @return the name of the thread that owns the object
+ * this thread is blocked on;
+ * {@code null} if this thread is not blocked
+ * or if the object is not owned by any thread.
+ *
+ * @see #getLockInfo
+ */
+ public String getLockOwnerName() {
+ return lockOwnerName;
+ }
+
+ /**
+ * Returns the stack trace of the thread
+ * associated with this {@code ThreadInfo}.
+ * If no stack trace was requested for this thread info, this method
+ * will return a zero-length array.
+ * If the returned array is of non-zero length then the first element of
+ * the array represents the top of the stack, which is the most recent
+ * method invocation in the sequence. The last element of the array
+ * represents the bottom of the stack, which is the least recent method
+ * invocation in the sequence.
+ *
+ * <p>Some Java virtual machines may, under some circumstances, omit one
+ * or more stack frames from the stack trace. In the extreme case,
+ * a virtual machine that has no stack trace information concerning
+ * the thread associated with this {@code ThreadInfo}
+ * is permitted to return a zero-length array from this method.
+ *
+ * @return an array of {@code StackTraceElement} objects of the thread.
+ */
+ public StackTraceElement[] getStackTrace() {
+ return stackTrace.clone();
+ }
+
+ /**
+ * Tests if the thread associated with this {@code ThreadInfo}
+ * is suspended. This method returns {@code true} if
+ * {@link Thread#suspend} has been called.
+ *
+ * @return {@code true} if the thread is suspended;
+ * {@code false} otherwise.
+ */
+ public boolean isSuspended() {
+ return suspended;
+ }
+
+ /**
+ * Tests if the thread associated with this {@code ThreadInfo}
+ * is executing native code via the Java Native Interface (JNI).
+ * The JNI native code does not include
+ * the virtual machine support code or the compiled native
+ * code generated by the virtual machine.
+ *
+ * @return {@code true} if the thread is executing native code;
+ * {@code false} otherwise.
+ */
+ public boolean isInNative() {
+ return inNative;
+ }
+
+ /**
+ * Tests if the thread associated with this {@code ThreadInfo} is
+ * a {@linkplain Thread#isDaemon daemon thread}.
+ *
+ * @return {@code true} if the thread is a daemon thread,
+ * {@code false} otherwise.
+ * @see Thread#isDaemon
+ * @since 9
+ */
+ public boolean isDaemon() {
+ return daemon;
+ }
+
+ /**
+ * Returns the {@linkplain Thread#getPriority() thread priority} of the
+ * thread associated with this {@code ThreadInfo}.
+ *
+ * @return The priority of the thread associated with this
+ * {@code ThreadInfo}.
+ * @since 9
+ */
+ public int getPriority() {
+ return priority;
+ }
+
+ /**
+ * Returns a string representation of this thread info.
+ * The format of this string depends on the implementation.
+ * The returned string will typically include
+ * the {@linkplain #getThreadName thread name},
+ * the {@linkplain #getThreadId thread ID},
+ * its {@linkplain #getThreadState state},
+ * and a {@linkplain #getStackTrace stack trace} if any.
+ *
+ * @return a string representation of this thread info.
+ */
+ public String toString() {
+ StringBuilder sb = new StringBuilder("\"" + getThreadName() + "\"" +
+ (daemon ? " daemon" : "") +
+ " prio=" + priority +
+ " Id=" + getThreadId() + " " +
+ getThreadState());
+ if (getLockName() != null) {
+ sb.append(" on " + getLockName());
+ }
+ if (getLockOwnerName() != null) {
+ sb.append(" owned by \"" + getLockOwnerName() +
+ "\" Id=" + getLockOwnerId());
+ }
+ if (isSuspended()) {
+ sb.append(" (suspended)");
+ }
+ if (isInNative()) {
+ sb.append(" (in native)");
+ }
+ sb.append('\n');
+ int i = 0;
+ for (; i < stackTrace.length && i < MAX_FRAMES; i++) {
+ StackTraceElement ste = stackTrace[i];
+ sb.append("\tat " + ste.toString());
+ sb.append('\n');
+ if (i == 0 && getLockInfo() != null) {
+ Thread.State ts = getThreadState();
+ switch (ts) {
+ case BLOCKED:
+ sb.append("\t- blocked on " + getLockInfo());
+ sb.append('\n');
+ break;
+ case WAITING:
+ sb.append("\t- waiting on " + getLockInfo());
+ sb.append('\n');
+ break;
+ case TIMED_WAITING:
+ sb.append("\t- waiting on " + getLockInfo());
+ sb.append('\n');
+ break;
+ default:
+ }
+ }
+
+ for (MonitorInfo mi : lockedMonitors) {
+ if (mi.getLockedStackDepth() == i) {
+ sb.append("\t- locked " + mi);
+ sb.append('\n');
+ }
+ }
+ }
+ if (i < stackTrace.length) {
+ sb.append("\t...");
+ sb.append('\n');
+ }
+
+ LockInfo[] locks = getLockedSynchronizers();
+ if (locks.length > 0) {
+ sb.append("\n\tNumber of locked synchronizers = " + locks.length);
+ sb.append('\n');
+ for (LockInfo li : locks) {
+ sb.append("\t- " + li);
+ sb.append('\n');
+ }
+ }
+ sb.append('\n');
+ return sb.toString();
+ }
+ private static final int MAX_FRAMES = 8;
+
+ /**
+ * Returns a {@code ThreadInfo} object represented by the
+ * given {@code CompositeData}.
+ * The given {@code CompositeData} must contain the following attributes
+ * unless otherwise specified below:
+ * <table class="striped" style="margin-left:2em">
+ * <caption style="display:none">The attributes and their types the given CompositeData contains</caption>
+ * <thead>
+ * <tr>
+ * <th scope="col">Attribute Name</th>
+ * <th scope="col">Type</th>
+ * </tr>
+ * </thead>
+ * <tbody style="text-align:left">
+ * <tr>
+ * <th scope="row">threadId</th>
+ * <td>{@code java.lang.Long}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">threadName</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">threadState</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">suspended</th>
+ * <td>{@code java.lang.Boolean}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">inNative</th>
+ * <td>{@code java.lang.Boolean}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">blockedCount</th>
+ * <td>{@code java.lang.Long}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">blockedTime</th>
+ * <td>{@code java.lang.Long}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">waitedCount</th>
+ * <td>{@code java.lang.Long}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">waitedTime</th>
+ * <td>{@code java.lang.Long}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">lockInfo</th>
+ * <td>{@code javax.management.openmbean.CompositeData}
+ * - the mapped type for {@link LockInfo} as specified in the
+ * {@link LockInfo#from} method.
+ * <p>
+ * If {@code cd} does not contain this attribute,
+ * the {@code LockInfo} object will be constructed from
+ * the value of the {@code lockName} attribute. </td>
+ * </tr>
+ * <tr>
+ * <th scope="row">lockName</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">lockOwnerId</th>
+ * <td>{@code java.lang.Long}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">lockOwnerName</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row"><a id="StackTrace">stackTrace</a></th>
+ * <td>{@code javax.management.openmbean.CompositeData[]}
+ * <p>
+ * Each element is a {@code CompositeData} representing
+ * StackTraceElement containing the following attributes:
+ * <table class="striped" style="margin-left:2em">
+ * <caption style="display:none">The attributes and their types the given CompositeData contains</caption>
+ * <thead style="text-align:center">
+ * <tr>
+ * <th scope="col">Attribute Name</th>
+ * <th scope="col">Type</th>
+ * </tr>
+ * </thead>
+ * <tbody style="text-align:left">
+ * <tr>
+ * <th scope="row">moduleName</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">moduleVersion</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">className</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">methodName</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">fileName</th>
+ * <td>{@code java.lang.String}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">lineNumber</th>
+ * <td>{@code java.lang.Integer}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">nativeMethod</th>
+ * <td>{@code java.lang.Boolean}</td>
+ * </tr>
+ * </tbody>
+ * </table>
+ * </td>
+ * </tr>
+ * <tr>
+ * <th scope="row">lockedMonitors</th>
+ * <td>{@code javax.management.openmbean.CompositeData[]}
+ * whose element type is the mapped type for
+ * {@link MonitorInfo} as specified in the
+ * {@link MonitorInfo#from Monitor.from} method.
+ * <p>
+ * If {@code cd} does not contain this attribute,
+ * this attribute will be set to an empty array. </td>
+ * </tr>
+ * <tr>
+ * <th scope="row">lockedSynchronizers</th>
+ * <td>{@code javax.management.openmbean.CompositeData[]}
+ * whose element type is the mapped type for
+ * {@link LockInfo} as specified in the {@link LockInfo#from} method.
+ * <p>
+ * If {@code cd} does not contain this attribute,
+ * this attribute will be set to an empty array. </td>
+ * </tr>
+ * <tr>
+ * <th scope="row">daemon</th>
+ * <td>{@code java.lang.Boolean}</td>
+ * </tr>
+ * <tr>
+ * <th scope="row">priority</th>
+ * <td>{@code java.lang.Integer}</td>
+ * </tr>
+ * </tbody>
+ * </table>
+ *
+ * @param cd {@code CompositeData} representing a {@code ThreadInfo}
+ *
+ * @throws IllegalArgumentException if {@code cd} does not
+ * represent a {@code ThreadInfo} with the attributes described
+ * above.
+ *
+ * @return a {@code ThreadInfo} object represented
+ * by {@code cd} if {@code cd} is not {@code null};
+ * {@code null} otherwise.
+ *
+ * @revised 9
+ * @spec JPMS
+ */
+ public static ThreadInfo from(CompositeData cd) {
+ if (cd == null) {
+ return null;
+ }
+
+ if (cd instanceof ThreadInfoCompositeData) {
+ return ((ThreadInfoCompositeData) cd).getThreadInfo();
+ } else {
+ return new ThreadInfo(cd);
+ }
+ }
+
+ /**
+ * Returns an array of {@link MonitorInfo} objects, each of which
+ * represents an object monitor currently locked by the thread
+ * associated with this {@code ThreadInfo}.
+ * If no locked monitor was requested for this thread info or
+ * no monitor is locked by the thread, this method
+ * will return a zero-length array.
+ *
+ * @return an array of {@code MonitorInfo} objects representing
+ * the object monitors locked by the thread.
+ *
+ * @since 1.6
+ */
+ public MonitorInfo[] getLockedMonitors() {
+ return lockedMonitors.clone();
+ }
+
+ /**
+ * Returns an array of {@link LockInfo} objects, each of which
+ * represents an <a href="LockInfo.html#OwnableSynchronizer">ownable
+ * synchronizer</a> currently locked by the thread associated with
+ * this {@code ThreadInfo}. If no locked synchronizer was
+ * requested for this thread info or no synchronizer is locked by
+ * the thread, this method will return a zero-length array.
+ *
+ * @return an array of {@code LockInfo} objects representing
+ * the ownable synchronizers locked by the thread.
+ *
+ * @since 1.6
+ */
+ public LockInfo[] getLockedSynchronizers() {
+ return lockedSynchronizers.clone();
+ }
+
+ private static final StackTraceElement[] NO_STACK_TRACE =
+ new StackTraceElement[0];
+}