Java Doc for ReadUncommittedStrategy.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.AbstractLockStrategy       org.apache.ojb.odmg.locking.ReadUncommittedStrategy ReadUncommittedStrategy public class ReadUncommittedStrategy extends AbstractLockStrategy (Code) The implementation of the Uncommited Reads Locking strategy. This strategy is the loosest of them all. It says you shouldn't need to get any Read locks whatsoever, but since it will probably try to get them, it will always give it to them. Locks are obtained on modifications to the database and held until end of transaction (EOT). Reading from the database does not involve any locking. Allows: Dirty Reads Non-Repeatable Reads Phantom Reads author:    Thomas Mahler & David Dixon-Peugh Method Summary public  boolean checkRead(TransactionImpl tx, Object obj)      checks whether the specified Object obj is read-locked by Transaction tx. public  boolean checkWrite(TransactionImpl tx, Object obj)      checks whether the specified Object obj is write-locked by Transaction tx. public  boolean readLock(TransactionImpl tx, Object obj)      acquire a read lock on Object obj for Transaction tx. public  boolean releaseLock(TransactionImpl tx, Object obj)      release a lock on Object obj for Transaction tx. public  boolean upgradeLock(TransactionImpl tx, Object obj)      acquire a lock upgrade (from read to write) lock on Object obj for Transaction tx. public  boolean writeLock(TransactionImpl tx, Object obj)      acquire a write lock on Object obj for Transaction tx. Method Detail checkRead public boolean checkRead(TransactionImpl tx, Object obj)(Code) checks whether the specified Object obj is read-locked by Transaction tx. Parameters:   tx - the transaction Parameters:   obj - the Object to be checked true if lock exists, else false checkWrite public boolean checkWrite(TransactionImpl tx, Object obj)(Code) checks whether the specified Object obj is write-locked by Transaction tx. Parameters:   tx - the transaction Parameters:   obj - the Object to be checked true if lock exists, else false readLock public boolean readLock(TransactionImpl tx, Object obj)(Code) acquire a read lock on Object obj for Transaction tx. Parameters:   tx - the transaction requesting the lock Parameters:   obj - the Object to be locked true if successful, else falseWhen we read Uncommitted, we don't care about Reader locks releaseLock public boolean releaseLock(TransactionImpl tx, Object obj)(Code) release a lock on Object obj for Transaction tx. Parameters:   tx - the transaction releasing the lock Parameters:   obj - the Object to be unlocked true if successful, else false upgradeLock public boolean upgradeLock(TransactionImpl tx, Object obj)(Code) acquire a lock upgrade (from read to write) lock on Object obj for Transaction tx. Parameters:   tx - the transaction requesting the lock Parameters:   obj - the Object to be locked true if successful, else false writeLock public boolean writeLock(TransactionImpl tx, Object obj)(Code) acquire a write lock on Object obj for Transaction tx. Parameters:   tx - the transaction requesting the lock Parameters:   obj - the Object to be locked true if successful, else false Fields inherited from org.apache.ojb.odmg.locking.AbstractLockStrategy public static long DEFAULT_LOCK_TIMEOUT(Code)(Java Doc) Methods inherited from org.apache.ojb.odmg.locking.AbstractLockStrategy protected boolean addReader(TransactionImpl tx, Object obj)(Code)(Java Doc) protected Collection getReaders(Object obj)(Code)(Java Doc) protected LockEntry getWriter(Object obj)(Code)(Java Doc) protected boolean hasReadLock(TransactionImpl tx, Object obj)(Code)(Java Doc) protected void removeReader(TransactionImpl tx, Object obj)(Code)(Java Doc) protected void removeWriter(LockEntry writer)(Code)(Java Doc) protected boolean setWriter(TransactionImpl tx, Object obj)(Code)(Java Doc) protected boolean upgradeLock(LockEntry reader)(Code)(Java Doc) 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)