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org.apache.derby.impl.services.locks
Class LockSpace  

java.lang.Object
  java.util.Dictionary
      java.util.Hashtable
          org.apache.derby.impl.services.locks.LockSpace

All Implemented Interfaces:

java.lang.Cloneable, java.util.Map, java.io.Serializable

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class LockSpace

extends java.util.Hashtable

A LockSpace represents the complete set of locks held within a single compatability space, broken into groups of locks. A LockSpace is a hashtable keyed by the group reference, the data for each key is a Hashtable of Lock's.

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Nested Class Summary

 

Nested classes inherited from class java.util.Hashtable

 

Nested classes inherited from class java.util.Map

java.util.Map.Entry

 

Field Summary
private  org.apache.derby.iapi.services.locks.Limit	callback
private  java.lang.Object	callbackGroup
private  java.lang.Object	compatSpace
private  java.util.Dictionary	holder
private  boolean	inLimit
private  int	limit
private  int	nextLimitCall
private  java.util.HashMap[]	spareGroups

 

Fields inherited from class java.util.Hashtable

 

Constructor Summary
(package private)	LockSpace(java.util.Dictionary holder, java.lang.Object compatSpace)

 

Method Summary
protected  void	addLock(java.lang.Object group, Lock lock)           Add a lock to a group.
(package private)  boolean	areLocksHeld(java.lang.Object group)           Return true if locks are held in a group
(package private)  void	clearLimit(java.lang.Object group)           Clear a limit set by setLimit.
(package private)  int	deadlockCount(int bail)           Return a count of the number of locks held by this space.
private  java.util.HashMap	getGroupMap(java.lang.Object group)
(package private)  boolean	isLockHeld(java.lang.Object group, org.apache.derby.iapi.services.locks.Lockable ref, java.lang.Object qualifier)
private  void	mergeGroups(java.util.HashMap from, java.util.HashMap into)
private  void	saveGroup(java.util.HashMap dl)
(package private)  void	setLimit(java.lang.Object group, int limit, org.apache.derby.iapi.services.locks.Limit callback)
(package private)  void	transfer(java.lang.Object oldGroup, java.lang.Object newGroup)
(package private)  void	unlockGroup(LockSet lset, java.lang.Object group)           Unlock all the locks in a group and then remove the group.
(package private)  void	unlockGroup(LockSet lset, java.lang.Object group, org.apache.derby.iapi.util.Matchable key)           Unlock all locks in the group that match the key
(package private)  int	unlockReference(LockSet lset, org.apache.derby.iapi.services.locks.Lockable ref, java.lang.Object qualifier, java.lang.Object group)

 

Methods inherited from class java.util.Hashtable

clear, clone, contains, containsKey, containsValue, elements, entrySet, equals, get, hashCode, isEmpty, keys, keySet, put, putAll, rehash, remove, size, toString, values

 

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

 

Field Detail

compatSpace

private final java.lang.Object compatSpace

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holder

private final java.util.Dictionary holder

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spareGroups

private java.util.HashMap[] spareGroups

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callbackGroup

private java.lang.Object callbackGroup

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limit

private int limit

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nextLimitCall

private int nextLimitCall

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callback

private org.apache.derby.iapi.services.locks.Limit callback

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inLimit

private boolean inLimit

Constructor Detail

LockSpace

LockSpace(java.util.Dictionary holder,
          java.lang.Object compatSpace)

Method Detail

addLock

protected void addLock(java.lang.Object group,
                       Lock lock)
                throws org.apache.derby.iapi.error.StandardException

Add a lock to a group.

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unlockGroup

void unlockGroup(LockSet lset,
                 java.lang.Object group)

Unlock all the locks in a group and then remove the group.

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getGroupMap

private java.util.HashMap getGroupMap(java.lang.Object group)

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saveGroup

private void saveGroup(java.util.HashMap dl)

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unlockGroup

void unlockGroup(LockSet lset,
                 java.lang.Object group,
                 org.apache.derby.iapi.util.Matchable key)

Unlock all locks in the group that match the key

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transfer

void transfer(java.lang.Object oldGroup,
              java.lang.Object newGroup)

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mergeGroups

private void mergeGroups(java.util.HashMap from,
                         java.util.HashMap into)

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unlockReference

int unlockReference(LockSet lset,
                    org.apache.derby.iapi.services.locks.Lockable ref,
                    java.lang.Object qualifier,
                    java.lang.Object group)

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areLocksHeld

boolean areLocksHeld(java.lang.Object group)

Return true if locks are held in a group

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isLockHeld

boolean isLockHeld(java.lang.Object group,
                   org.apache.derby.iapi.services.locks.Lockable ref,
                   java.lang.Object qualifier)

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setLimit

void setLimit(java.lang.Object group,
              int limit,
              org.apache.derby.iapi.services.locks.Limit callback)

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clearLimit

void clearLimit(java.lang.Object group)

Clear a limit set by setLimit.

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deadlockCount

int deadlockCount(int bail)

Return a count of the number of locks held by this space. The argument bail indicates at which point the counting should bail out and return the current count. This routine will bail if the count is greater than bail. Thus this routine is intended to for deadlock code to find the space with the fewest number of locks.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> services >> [ locks overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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