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 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.