Java Doc for InMemoryLockMapImpl.java in  » Database-ORM » db-ojb » org » apache » ojb » odmg » locking » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.odmg.locking   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.apache.ojb.odmg.locking.InMemoryLockMapImpl InMemoryLockMapImpl public class InMemoryLockMapImpl implements LockMap(Code) We use a HashMap and synchronize blocks of access for a get "check" then put operation. We cannot use the hashtable as you could check in one synchronized call then put in another while a different thread is doing the same thing. author:    Matthew Baird author:    update for use of Hashmap with synchronization. author:    implemented timed out lock removal algo. author:    Thomas Mahler author:    original author. version:    $Id: InMemoryLockMapImpl.java,v 1.14.2.3 2005/12/21 22:29:51 tomdz Exp $ Method Summary public  boolean addReader(TransactionImpl tx, Object obj)      Add a reader lock entry for transaction tx on object obj to the persistent storage.  void addReaderInternal(LockEntry reader)      public  void configure(Configuration pConfig)      public  Collection getReaders(Object obj)      returns a collection of Reader LockEntries for object obj. public  Collection getReaders(Identity oid)       int getSize()      public  LockEntry getWriter(Object obj)      returns the LockEntry for the Writer of object obj. public  LockEntry getWriter(Identity oid)      public  boolean hasReadLock(TransactionImpl tx, Object obj)      check if there is a reader lock entry for transaction tx on object obj in the persistent storage.  boolean hasReadLock(LockEntry entry)      public  void removeReader(TransactionImpl tx, Object obj)      remove a reader lock entry for transaction tx on object obj from the persistent storage.  void removeReaderByLock(LockEntry lock)      public  void removeWriter(LockEntry writer)      remove a writer lock entry for transaction tx on object obj from the persistent storage. public  boolean setWriter(TransactionImpl tx, Object obj)      generate a writer lock entry for transaction tx on object obj and write it to the persistent storage.  void setWriterByLock(LockEntry writer)      public  boolean upgradeLock(LockEntry reader)      upgrade a reader lock entry for transaction tx on object obj and write it to the persistent storage. Method Detail addReader public boolean addReader(TransactionImpl tx, Object obj)(Code) Add a reader lock entry for transaction tx on object obj to the persistent storage. addReaderInternal void addReaderInternal(LockEntry reader)(Code) configure public void configure(Configuration pConfig) throws ConfigurationException(Code) getReaders public Collection getReaders(Object obj)(Code) returns a collection of Reader LockEntries for object obj. If no LockEntries could be found an empty Vector is returned. getReaders public Collection getReaders(Identity oid)(Code) getSize int getSize()(Code) getWriter public LockEntry getWriter(Object obj)(Code) returns the LockEntry for the Writer of object obj. If now writer exists, null is returned. getWriter public LockEntry getWriter(Identity oid)(Code) hasReadLock public boolean hasReadLock(TransactionImpl tx, Object obj)(Code) check if there is a reader lock entry for transaction tx on object obj in the persistent storage. hasReadLock boolean hasReadLock(LockEntry entry)(Code) removeReader public void removeReader(TransactionImpl tx, Object obj)(Code) remove a reader lock entry for transaction tx on object obj from the persistent storage. removeReaderByLock void removeReaderByLock(LockEntry lock)(Code) removeWriter public void removeWriter(LockEntry writer)(Code) remove a writer lock entry for transaction tx on object obj from the persistent storage. setWriter public boolean setWriter(TransactionImpl tx, Object obj)(Code) generate a writer lock entry for transaction tx on object obj and write it to the persistent storage. setWriterByLock void setWriterByLock(LockEntry writer)(Code) upgradeLock public boolean upgradeLock(LockEntry reader)(Code) upgrade a reader lock entry for transaction tx on object obj and write it to the persistent storage. Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)