Java Doc for TransactionLogicalLock.java in  » Database-JDBC-Connection-Pool » sequoia-2.10.9 » org » continuent » sequoia » common » locks » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database JDBC Connection Pool » sequoia 2.10.9 » org.continuent.sequoia.common.locks   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.continuent.sequoia.common.locks.TransactionLogicalLock TransactionLogicalLock public class TransactionLogicalLock (Code) This class defines a TransactionLogicalLock which is an exclusive lock that let the owner of the lock acquire several times the lock (but it needs to be released only once). Acquire is not blocking but just a hint whether the lock has been granted or the request has been queued. author:    Emmanuel Cecchet version:    1.0 Inner Class :protected class WaitingListElement Method Summary public  boolean acquire(AbstractRequest request)      Acquires an exclusive lock on this table. public  long getLocker()      Returns the transaction id of the lock owner. protected  List getWaitingList()      Returns the list of requests waiting for this lock. public  boolean isLocked()      Returns true if the lock is owned by someone. public synchronized  boolean isWaiting(long transactionId)      Returns true if the given transaction id is contained in this lock waiting queue. public synchronized  boolean release(long transactionId)      Releases the lock on this table or remove the transaction from the waiting list if it was not holding the lock. Method Detail acquire public boolean acquire(AbstractRequest request)(Code) Acquires an exclusive lock on this table. If the lock is already held by the same transaction as the given request, this method is non-blocking else the caller is blocked until the transaction holding the lock releases it at commit/rollback time. Parameters:   request - request asking for the lock (timeout field is used andupdated upon waiting) boolean true is the lock has been successfully acquired, false ontimeout or error See Also:   TransactionLogicalLock.release(long) getLocker public long getLocker()(Code) Returns the transaction id of the lock owner. The return value is undefined if the lock is not owned (usually it is the last owner). int the transaction id. getWaitingList protected List getWaitingList()(Code) Returns the list of requests waiting for this lock. list of WaitingListElement type objects. isLocked public boolean isLocked()(Code) Returns true if the lock is owned by someone. boolean value isWaiting public synchronized boolean isWaiting(long transactionId)(Code) Returns true if the given transaction id is contained in this lock waiting queue. Parameters:   transactionId - a transaction id a boolean value release public synchronized boolean release(long transactionId)(Code) Releases the lock on this table or remove the transaction from the waiting list if it was not holding the lock. Parameters:   transactionId - the transaction releasing the lock true if the transaction had the lock or was in the waiting list See Also:   TransactionLogicalLock.acquire(AbstractRequest) 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)