File	Doc	Category	Size	Date	Package
ThreadInfo.java	API Doc	Java SE 5 API	18585	Fri Aug 26 14:57:06 BST 2005	java.lang.management

ThreadInfo

• java.lang.Object

Fields Summary
private final String	threadName
private final long	threadId
private final long	blockedTime
private final long	blockedCount
private final long	waitedTime
private final long	waitedCount
private final String	lockName
private final long	lockOwnerId
private final String	lockOwnerName
private final boolean	inNative
private final boolean	suspended
private final Thread$State	threadState
private final StackTraceElement[]	stackTrace
private static final StackTraceElement[]	NO_STACK_TRACE

Constructors Summary
private ThreadInfo(Thread t, int state, Object lockObj, Thread lockOwner, long blockedCount, long blockedTime, long waitedCount, long waitedTime, StackTraceElement[] stackTrace) Constructor of ThreadInfo created by the JVM param t Thread param state Thread state param lockObj Object on which the thread is blocked to enter or waiting 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 this.threadId = t.getId(); this.threadName = t.getName(); this.threadState = sun.management.ManagementFactory.toThreadState(state); this.suspended = sun.management.ManagementFactory.isThreadSuspended(state); this.inNative = sun.management.ManagementFactory.isThreadRunningNative(state); this.blockedCount = blockedCount; this.blockedTime = blockedTime; this.waitedCount = waitedCount; this.waitedTime = waitedTime; if (lockObj == null) { this.lockName = null; } else { this.lockName = lockObj.getClass().getName() + '@" + Integer.toHexString(System.identityHashCode(lockObj)); } if (lockOwner == null) { this.lockOwnerId = -1; this.lockOwnerName = null; } else {; this.lockOwnerId = lockOwner.getId(); this.lockOwnerName = lockOwner.getName(); } this.stackTrace = stackTrace;
private ThreadInfo(CompositeData cd) ThreadInfoCompositeData.validateCompositeData(cd); threadId = ThreadInfoCompositeData.getThreadId(cd); threadName = ThreadInfoCompositeData.getThreadName(cd); blockedTime = ThreadInfoCompositeData.getBlockedTime(cd); blockedCount = ThreadInfoCompositeData.getBlockedCount(cd); waitedTime = ThreadInfoCompositeData.getWaitedTime(cd); waitedCount = ThreadInfoCompositeData.getWaitedCount(cd); lockName = ThreadInfoCompositeData.getLockName(cd); lockOwnerId = ThreadInfoCompositeData.getLockOwnerId(cd); lockOwnerName = ThreadInfoCompositeData.getLockOwnerName(cd); threadState = ThreadInfoCompositeData.getThreadState(cd); suspended = ThreadInfoCompositeData.isSuspended(cd); inNative = ThreadInfoCompositeData.isInNative(cd); stackTrace = ThreadInfoCompositeData.getStackTrace(cd);

Methods Summary
public static java.lang.management.ThreadInfo	from(javax.management.openmbean.CompositeData cd) Returns a ThreadInfo object represented by the given CompositeData. The given CompositeData must contain the following attributes: Attribute Name Type threadId java.lang.Long threadName java.lang.String threadState java.lang.String suspended java.lang.Boolean inNative java.lang.Boolean blockedCount java.lang.Long blockedTime java.lang.Long waitedCount java.lang.Long waitedTime java.lang.Long lockName java.lang.String lockOwnerId java.lang.Long lockOwnerName java.lang.String stackTrace javax.management.openmbean.CompositeData[] Each element is a CompositeData representing StackTraceElement containing the following attributes: Attribute Name Type className java.lang.String methodName java.lang.String fileName java.lang.String lineNumber java.lang.Integer nativeMethod java.lang.Boolean param cd CompositeData representing a ThreadInfo throws IllegalArgumentException if cd does not represent a ThreadInfo with the attributes described above. return a ThreadInfo object represented by cd if cd is not null; null otherwise. if (cd == null) { return null; } if (cd instanceof ThreadInfoCompositeData) { return ((ThreadInfoCompositeData) cd).getThreadInfo(); } else { return new ThreadInfo(cd); }
public long	getBlockedCount() Returns the total number of times that the thread associated with this 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 BLOCKED state. return blockedCount;
public long	getBlockedTime() Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this 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 -1 if thread contention monitoring is disabled. 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 BLOCKED state; -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 return blockedTime;
public java.lang.String	getLockName() Returns the string representation of the monitor lock that the thread associated with this ThreadInfo is blocked to enter or waiting to be notified through the {@link Object#wait Object.wait} method. The returned string representation of a monitor lock consists of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the identity hash code of the object. The returned string may not be unique depending on the implementation of the {@link System#identityHashCode} method. This method returns a string equals to the value of: lock.getClass().getName() + '@' + Integer.toHexString(System.identityHashCode(lock)) where lock is the monitor lock object. If the thread is not blocking to enter on any monitor object, or is not waiting on a monitor object for notification in a Object.wait call, this method returns null. return the string representation of the monitor lock that the thread is blocking to enter or waiting to be notified through the Object.wait method if any; null otherwise. return lockName;
public long	getLockOwnerId() Returns the ID of the thread which holds the monitor lock of an object on which the thread associated with this ThreadInfo is blocking. This method will return -1 if this thread is not blocked or waiting on any monitor, or if the monitor lock is not held by any thread. return the thread ID of the owner thread of the monitor lock of the object this thread is blocking on; -1 if this thread is not blocked or waiting on any monitor, or if the monitor lock is not held by any thread. see #getLockName return lockOwnerId;
public java.lang.String	getLockOwnerName() Returns the name of the thread which holds the monitor lock of an object on which the thread associated with this ThreadInfo is blocking. This method will return null if this thread is not blocked or waiting on any monitor, or if the monitor lock is not held by any thread. return the name of the thread that holds the monitor lock of the object this thread is blocking on; null if this thread is not blocked or waiting on any monitor, or if the monitor lock is not held by any thread. see #getLockName return lockOwnerName;
public java.lang.StackTraceElement[]	getStackTrace() Returns the stack trace of the thread associated with this 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. 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 ThreadInfo is permitted to return a zero-length array from this method. return an array of StackTraceElement objects of the thread. if (stackTrace == null) { return NO_STACK_TRACE; } else { return stackTrace; }
public long	getThreadId() Returns the ID of the thread associated with this ThreadInfo. return the ID of the associated thread. return threadId;
public java.lang.String	getThreadName() Returns the name of the thread associated with this ThreadInfo. return the name of the associated thread. return threadName;
public java.lang.Thread$State	getThreadState() Returns the state of the thread associated with this ThreadInfo. return Thread.State of the associated thread. return threadState;
public long	getWaitedCount() Returns the total number of times that the thread associated with this 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 WAITING or TIMED_WAITING state. return waitedCount;
public long	getWaitedTime() Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this 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 -1 if thread contention monitoring is disabled. 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 WAITING or TIMED_WAITING state; -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 return waitedTime;
public boolean	isInNative() Tests if the thread associated with this 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 true if the thread is executing native code; false otherwise. return inNative;
public boolean	isSuspended() Tests if the thread associated with this ThreadInfo is suspended. This method returns true if {@link Thread#suspend} has been called. return true if the thread is suspended; false otherwise. return suspended;
public java.lang.String	toString() Returns a string representation of this thread info. return a string representation of this thread info. return "Thread " + getThreadName() + " (Id = " + getThreadId() + ") " + getThreadState() + " " + getLockName();