Module java.management

Package java.lang.management

Class LockInfo

java.lang.Object

java.lang.management.LockInfo

Direct Known Subclasses:

MonitorInfo

public class LockInfo
extends Object

Information about a lock. A lock can be a built-in object monitor, an ownable synchronizer, or the Condition object associated with synchronizers.

An ownable synchronizer is a synchronizer that may be exclusively owned by a thread and uses AbstractOwnableSynchronizer (or its subclass) to implement its synchronization property. ReentrantLock and the write-lock (but not the read-lock) of ReentrantReadWriteLock are two examples of ownable synchronizers provided by the platform.

MXBean Mapping

LockInfo is mapped to a CompositeData as specified in the from method.

Since:

1.6

See Also:

• AbstractOwnableSynchronizer
• Condition

Constructor Summary

Constructors

Constructor	Description
LockInfo(String className, int identityHashCode)	Constructs a LockInfo object.

Method Summary

Modifier and Type	Method	Description
static LockInfo	from(CompositeData cd)	Returns a LockInfo object represented by the given CompositeData.
String	getClassName()	Returns the fully qualified name of the class of the lock object.
int	getIdentityHashCode()	Returns the identity hash code of the lock object returned from the System.identityHashCode(java.lang.Object) method.
String	toString()	Returns a string representation of a lock.

Methods declared in class java.lang.Object

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

Constructor Details

LockInfo

public LockInfo(String className,
 int identityHashCode)

Constructs a LockInfo object.

Parameters:

className - the fully qualified name of the class of the lock object.

identityHashCode - the identity hash code of the lock object.

Method Details

getClassName

public String getClassName()

Returns the fully qualified name of the class of the lock object.

Returns:

the fully qualified name of the class of the lock object.

getIdentityHashCode

public int getIdentityHashCode()

Returns the identity hash code of the lock object returned from the System.identityHashCode(java.lang.Object) method.

Returns:

the identity hash code of the lock object.

from

public static LockInfo from(CompositeData cd)

Returns a LockInfo object represented by the given CompositeData. The given CompositeData must contain the following attributes:

The attributes and the types the given CompositeData contains

Attribute Name	Type
className	java.lang.String
identityHashCode	java.lang.Integer

Parameters:

cd - CompositeData representing a LockInfo

Returns:

a LockInfo object represented by cd if cd is not null; null otherwise.

Throws:

IllegalArgumentException - if cd does not represent a LockInfo with the attributes described above.

Since:

1.8

toString

public String toString()

Returns a string representation of a lock. The returned string representation consists of the name of the class of the lock object, the at-sign character `@', and the unsigned hexadecimal representation of the identity hash code of the object. This method returns a string equals to the value of:

 lock.getClass().getName() + '@' + Integer.toHexString(System.identityHashCode(lock))
 

where lock is the lock object.

Overrides:

toString in class Object

Returns:

the string representation of a lock.