Java Doc for TransactionManager.java in  » Database-DBMS » Ozone-1.1 » org » ozoneDB » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » Ozone 1.1 » org.ozoneDB.core   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.ozoneDB.core.ServerComponent       org.ozoneDB.core.TransactionManager TransactionManager final public class TransactionManager extends ServerComponent (Code) The transaction manager is the factory for transactions and locks. author:    SMB author:    Medium.net version:    $Revision: 1.2 $Date: 2002/06/08 00:49:38 $ Field Summary protected  long acquireCount      protected  boolean alsoNotifySomeSleepingTransactions      If we notify all transactions, they not-blocked-ones may wake up from sleeping. protected  Transaction deadlockTA      Used to signal a deadlock and which Transaction should abort. protected  Thread exclusiveThread      True if one thread runs exclusively. protected  DxMap taTable      All currently running transactions. protected  DxMap threadTable      In local mode this maps threads to transactions. Constructor Summary public   TransactionManager(Env _env)      Method Summary protected  void abortTransaction(Transaction ta, DbCommand command)      protected synchronized  void beginExclusion()      public synchronized  void checkDeadlocks()      This method checks for deadlocks between all current transaction. public  void checkExclusion()      Blocks execution until there is no thread scheduled for exclusive execution or the exclusive thread is the current thread. protected  void commitTransaction(Transaction ta, DbCommand command)      protected  void completeTransaction(DbCommand command, User user)      Perform the specified command within a new transaction. public  Transaction currentTA()      public  void deleteTransaction()      Delete the transaction that is associated with the current thread. protected synchronized  void endExclusion()      public  void handleCommand(DbCommand command, DbInvokeClient client)      Handle the specified command on behalf of the current thread/transaction. public  void handleCommand(DbCommand command, User user)      Handle the specified command on behalf of the current thread/transaction. public synchronized  boolean isDeadlockTA(Transaction ta)      Check if the given transaction should abort because of a deadlock. public  Lock newLock()      Factory method to generate proper Lock objects. public  Transaction newTransaction(User owner)      public  void notifyWaitingTransactions()      Notify each thread that is associated with a currently blocked transaction by calling notifyAll() on the blocked transaction. protected  boolean performCommand(Transaction ta, DbCommand command)      Perform the specified command on behalf of the specified thread/transaction. protected  boolean prepareTransaction(Transaction ta, DbCommand command)      Prepare the specified transaction. public  void save()      public  void shutdown()      public  void startGarbageCollectionWaitForCurrentTransactionsToCompletePhase(GarbageCollector garbageCollector)      Starts the GarbageColection pre-phase. public  void startup()      public  Transaction taForID(TransactionID taID)      public  int taTableCount()      Field Detail acquireCount protected long acquireCount(Code) alsoNotifySomeSleepingTransactions protected boolean alsoNotifySomeSleepingTransactions(Code) If we notify all transactions, they not-blocked-ones may wake up from sleeping. deadlockTA protected Transaction deadlockTA(Code) Used to signal a deadlock and which Transaction should abort. exclusiveThread protected Thread exclusiveThread(Code) True if one thread runs exclusively. taTable protected DxMap taTable(Code) All currently running transactions. taID -> ta threadTable protected DxMap threadTable(Code) In local mode this maps threads to transactions. Constructor Detail TransactionManager public TransactionManager(Env _env)(Code) Method Detail abortTransaction protected void abortTransaction(Transaction ta, DbCommand command) throws Exception(Code) beginExclusion protected synchronized void beginExclusion()(Code) checkDeadlocks public synchronized void checkDeadlocks() throws Exception(Code) This method checks for deadlocks between all current transaction. checkExclusion public void checkExclusion()(Code) Blocks execution until there is no thread scheduled for exclusive execution or the exclusive thread is the current thread. commitTransaction protected void commitTransaction(Transaction ta, DbCommand command) throws Exception(Code) completeTransaction protected void completeTransaction(DbCommand command, User user) throws Exception(Code) Perform the specified command within a new transaction. currentTA public Transaction currentTA()(Code) der aktuelle thread is auch die aktuelle transaktion (wenn der thread ueberhaupt eine transaktion ist) deleteTransaction public void deleteTransaction()(Code) Delete the transaction that is associated with the current thread. endExclusion protected synchronized void endExclusion()(Code) handleCommand public void handleCommand(DbCommand command, DbInvokeClient client)(Code) Handle the specified command on behalf of the current thread/transaction. This method is called by the InvokeServer after it has handled InvokeServer specific command. handleCommand public void handleCommand(DbCommand command, User user)(Code) Handle the specified command on behalf of the current thread/transaction. This method is called by the InvokeServer after it has handled InvokeServer specific command. isDeadlockTA public synchronized boolean isDeadlockTA(Transaction ta)(Code) Check if the given transaction should abort because of a deadlock. newLock public Lock newLock()(Code) Factory method to generate proper Lock objects. These Lock objects are used in the store backend but they have to be generated in the core to meet the requirements of the transaction implementation. newTransaction public Transaction newTransaction(User owner) throws TransactionExc(Code) notifyWaitingTransactions public void notifyWaitingTransactions()(Code) Notify each thread that is associated with a currently blocked transaction by calling notifyAll() on the blocked transaction. performCommand protected boolean performCommand(Transaction ta, DbCommand command) throws Exception(Code) Perform the specified command on behalf of the specified thread/transaction. If the transaction has performed only one command until now, this handles deadlocks by re-performing the command again until it throws an exception or completes sucessfully. Otherwise an exception is thrown True if the command did not throw an exception throws:   Exception - Any exception always signals an internal error. prepareTransaction protected boolean prepareTransaction(Transaction ta, DbCommand command) throws Exception(Code) Prepare the specified transaction. Return true on success and false if something failed. In this case the transaction is rolled back. This method throws an exception only if an internal server error occured. save public void save() throws Exception(Code) shutdown public void shutdown() throws Exception(Code) startGarbageCollectionWaitForCurrentTransactionsToCompletePhase public void startGarbageCollectionWaitForCurrentTransactionsToCompletePhase(GarbageCollector garbageCollector)(Code) Starts the GarbageColection pre-phase. This is the time where all transactions have to complete (either commit or rollback) until there are no transactions left which were created before this call. startup public void startup() throws Exception(Code) taForID public Transaction taForID(TransactionID taID)(Code) taTableCount public int taTableCount()(Code) Fields inherited from org.ozoneDB.core.ServerComponent protected transient Env env(Code)(Java Doc) Methods inherited from org.ozoneDB.core.ServerComponent public synchronized void clearChanged()(Code)(Java Doc) public boolean hasChanged()(Code)(Java Doc) abstract public void save() throws Exception(Code)(Java Doc) public synchronized void setChanged()(Code)(Java Doc) abstract public void shutdown() throws Exception(Code)(Java Doc) abstract public void startup() throws Exception(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)