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Java Source Code / Java Documentation » Database JDBC Connection Pool » Apache commons transaction 1.2 » org.apache.commons.transaction.memory   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.apache.commons.transaction.memory.TransactionalMapWrapper       org.apache.commons.transaction.memory.PessimisticMapWrapper PessimisticMapWrapper public class PessimisticMapWrapper extends TransactionalMapWrapper (Code) Wrapper that adds transactional control to all kinds of maps that implement the Map interface. By using pessimistic transaction control (blocking locks) this wrapper has better isolation than TransactionalMapWrapper , but also has less possible concurrency and may even deadlock. A commit, however, will never fail. Start a transaction by calling PessimisticMapWrapper.startTransaction() . Then perform the normal actions on the map and finally either call PessimisticMapWrapper.commitTransaction() to make your changes permanent or PessimisticMapWrapper.rollbackTransaction() to undo them. Caution: Do not modify values retrieved by PessimisticMapWrapper.get(Object) as this will circumvent the transactional mechanism. Rather clone the value or copy it in a way you see fit and store it back using PessimisticMapWrapper.put(Object,Object) . Note: This wrapper guarantees isolation level SERIALIZABLE. version:    $Id: PessimisticMapWrapper.java 493628 2007-01-07 01:42:48Z joerg $ See Also:   TransactionalMapWrapper See Also:   OptimisticMapWrapper Inner Class :public class LockingTxContext extends TxContext Field Summary final protected static  Object GLOBAL_LOCK      final protected static  int READ      final protected static  int WRITE      protected  ReadWriteLockManager lockManager      protected  long readTimeOut      Constructor Summary public   PessimisticMapWrapper(Map wrapped, LoggerFacade logger)      Creates a new pessimistic transactional map wrapper. public   PessimisticMapWrapper(Map wrapped, MapFactory mapFactory, SetFactory setFactory, LoggerFacade logger)      Creates a new pessimistic transactional map wrapper. Method Summary protected  void assureGlobalReadLock()      protected  void assureWriteLock(Object key)      public  Set entrySet()      public  Set keySet()      public  Object put(Object key, Object value)      public  Object remove(Object key)      public  void startTransaction()      public  Collection values()      Field Detail GLOBAL_LOCK final protected static Object GLOBAL_LOCK(Code) READ final protected static int READ(Code) WRITE final protected static int WRITE(Code) lockManager protected ReadWriteLockManager lockManager(Code) readTimeOut protected long readTimeOut(Code) Constructor Detail PessimisticMapWrapper public PessimisticMapWrapper(Map wrapped, LoggerFacade logger)(Code) Creates a new pessimistic transactional map wrapper. Temporary maps and sets to store transactional data will be instances of java.util.HashMap and java.util.HashSet . Parameters:   wrapped - map to be wrapped Parameters:   logger - generic logger used for all kinds of logging PessimisticMapWrapper public PessimisticMapWrapper(Map wrapped, MapFactory mapFactory, SetFactory setFactory, LoggerFacade logger)(Code) Creates a new pessimistic transactional map wrapper. Temporary maps and sets to store transactional data will be created and disposed using MapFactory and SetFactory . Parameters:   wrapped - map to be wrapped Parameters:   mapFactory - factory for temporary maps Parameters:   setFactory - factory for temporary sets Parameters:   logger - generic logger used for all kinds of logging Method Detail assureGlobalReadLock protected void assureGlobalReadLock()(Code) assureWriteLock protected void assureWriteLock(Object key)(Code) entrySet public Set entrySet()(Code) keySet public Set keySet()(Code) put public Object put(Object key, Object value)(Code) remove public Object remove(Object key)(Code) startTransaction public void startTransaction()(Code) values public Collection values()(Code) Fields inherited from org.apache.commons.transaction.memory.TransactionalMapWrapper protected MapFactory mapFactory(Code)(Java Doc) protected SetFactory setFactory(Code)(Java Doc) protected Map wrapped(Code)(Java Doc) Methods inherited from org.apache.commons.transaction.memory.TransactionalMapWrapper public void clear()(Code)(Java Doc) public void commitTransaction()(Code)(Java Doc) public boolean containsKey(Object key)(Code)(Java Doc) public boolean containsValue(Object value)(Code)(Java Doc) public Set entrySet()(Code)(Java Doc) public Object get(Object key)(Code)(Java Doc) protected TxContext getActiveTx()(Code)(Java Doc) public int getTransactionState()(Code)(Java Doc) public boolean isEmpty()(Code)(Java Doc) public boolean isReadOnly()(Code)(Java Doc) public boolean isTransactionMarkedForRollback()(Code)(Java Doc) public Set keySet()(Code)(Java Doc) public void markTransactionForRollback()(Code)(Java Doc) public Object put(Object key, Object value)(Code)(Java Doc) public void putAll(Map map)(Code)(Java Doc) public Object remove(Object key)(Code)(Java Doc) public void resumeTransaction(TxContext suspendedTx)(Code)(Java Doc) public void rollbackTransaction()(Code)(Java Doc) protected void setActiveTx(TxContext txContext)(Code)(Java Doc) public int size()(Code)(Java Doc) public void startTransaction()(Code)(Java Doc) public TxContext suspendTransaction()(Code)(Java Doc) public Collection values()(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)