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org.apache.derby.iapi.services.locks
Class ShExLockable  

java.lang.Object
  org.apache.derby.iapi.services.locks.ShExLockable

All Implemented Interfaces:

Lockable

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public class ShExLockable

extends java.lang.Object

implements Lockable

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Constructor Summary

ShExLockable()

 

Method Summary
boolean	lockAttributes(int flag, java.util.Hashtable attributes)           This lockable want to participate in the Virtual LockTable when we want to print LATCH information.
boolean	lockerAlwaysCompatible()           Returns true if any lock request on a Lockable L in a compatibility space CS1 is compatible with any other lock held on L in CS1.
void	lockEvent(Latch lockInfo)           Note the fact the object is locked.
boolean	requestCompatible(java.lang.Object requestedQualifier, java.lang.Object grantedQualifier)           Return true if the requested qualifier is compatible with the already granted qualifier.
void	unlockEvent(Latch lockInfo)           Note that the object has been unlocked

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

ShExLockable

public ShExLockable()

Method Detail

lockerAlwaysCompatible

public boolean lockerAlwaysCompatible()

Description copied from interface: Lockable

Returns true if any lock request on a Lockable L in a compatibility space CS1 is compatible with any other lock held on L in CS1.

Specified by:

lockerAlwaysCompatible in interface Lockable

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requestCompatible

public boolean requestCompatible(java.lang.Object requestedQualifier,
                                 java.lang.Object grantedQualifier)

Description copied from interface: Lockable

Return true if the requested qualifier is compatible with the already granted qualifier.

Specified by:

requestCompatible in interface Lockable

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lockEvent

public void lockEvent(Latch lockInfo)

Description copied from interface: Lockable

Note the fact the object is locked. Performs required actions to ensure that unlockEvent() work correctly. This method does not actually perform any locking of the object, the locking mechanism is provided by the lock manager.

If the class supports multiple lockers of the object then this method will be called once per locker, each with their own qualifier.

Must only be called by the lock manager. Synchronization will be handled by the lock manager.

Specified by:

lockEvent in interface Lockable

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unlockEvent

public void unlockEvent(Latch lockInfo)

Description copied from interface: Lockable

Note that the object has been unlocked

Must only be called by the lock manager. Synchronization will be handled by the lock manager.

Specified by:

unlockEvent in interface Lockable

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lockAttributes

public boolean lockAttributes(int flag,
                              java.util.Hashtable attributes)

This lockable want to participate in the Virtual LockTable when we want to print LATCH information. Any lockable object which DOES NOT want to participate should override this function.

Specified by:

lockAttributes in interface Lockable

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