Class MonitorInfo

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

public class MonitorInfo
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

Constructors

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.

Methods

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

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.