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:

  • 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(Object) method.
    String
    toString()
    Returns a string representation of a lock.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  • 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(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.