MonitorInfo (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

Overview

Package

Class

Use

Tree

Deprecated

Index

Help

Java™ Platform
Standard Ed. 6

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

java.lang.management
Class MonitorInfo

java.lang.Object
  java.lang.management.LockInfo
      java.lang.management.MonitorInfo

public class MonitorInfo
extends LockInfo
extends LockInfo

Information about an object monitor lock. An object monitor is locked when entering a synchronization block or method on that object.

MXBean Mapping

MonitorInfo is mapped to a CompositeData with attributes as specified in the from method.

Since:: 1.6

Constructor Summary

MonitorInfo(String className, int identityHashCode, int stackDepth, StackTraceElement stackFrame)
          Construct a MonitorInfo object.

Method Summary

static MonitorInfo from(CompositeData cd)
          Returns a MonitorInfo object represented by the given CompositeData.

int getLockedStackDepth()
          Returns the depth in the stack trace where the object monitor was locked.

StackTraceElement getLockedStackFrame()
          Returns the stack frame that locked the object monitor.

Methods inherited from class java.lang.management.LockInfo

getClassName, getIdentityHashCode, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Summary
`MonitorInfo(String className, int identityHashCode, int stackDepth, StackTraceElement stackFrame)` Construct a `MonitorInfo` object.

Method Summary
`static MonitorInfo`	`from(CompositeData cd)` Returns a `MonitorInfo` object represented by the given `CompositeData`.
`int`	`getLockedStackDepth()` Returns the depth in the stack trace where the object monitor was locked.
`StackTraceElement`	`getLockedStackFrame()` Returns the stack frame that locked the object monitor.

Methods inherited from class java.lang.management.LockInfo
`getClassName, getIdentityHashCode, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

MonitorInfo

public MonitorInfo(String className,
                   int identityHashCode,
                   int stackDepth,
                   StackTraceElement stackFrame)

Construct a MonitorInfo object.

Parameters:: className - the fully qualified name of the class of the lock object.; identityHashCode - the identity hash code of the lock object.; stackDepth - the depth in the stack trace where the object monitor was locked.; stackFrame - the stack frame that locked the object monitor.
Throws:: IllegalArgumentException - if stackDepth ≥ 0 but stackFrame is null, or stackDepth < 0 but stackFrame is not null.

Method Detail

getLockedStackDepth

public int getLockedStackDepth()

Returns the depth in the stack trace where the object monitor was locked. The depth is the index to the StackTraceElement array returned in the ThreadInfo.getStackTrace() method.

Returns:: the depth in the stack trace where the object monitor was locked, or a negative number if not available.

getLockedStackFrame

public StackTraceElement getLockedStackFrame()

Returns the stack frame that locked the object monitor.

Returns:: StackTraceElement that locked the object monitor, or null if not available.

from

public static MonitorInfo from(CompositeData cd)

Returns a MonitorInfo object represented by the given CompositeData. The given CompositeData must contain the following attributes as well as the attributes specified in the mapped type for the LockInfo class:

Attribute Name Type

lockedStackFrame CompositeData as specified in the stackTrace attribute defined in the ThreadInfo.from method.

lockedStackDepth java.lang.Integer

Attribute Name	Type
lockedStackFrame	`CompositeData as specified in the stackTrace attribute defined in the ThreadInfo.from method.`
lockedStackDepth	`java.lang.Integer`

Parameters:: cd - CompositeData representing a MonitorInfo
Returns:: a MonitorInfo object represented by cd if cd is not null; null otherwise.
Throws:: IllegalArgumentException - if cd does not represent a MonitorInfo with the attributes described above.