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//----------------------------------------------------------------------------
//
// Module:      CoordinatorResourceImpl.java
//
// Description: Subordinate Coordinator participation interface.
//
// Product:     com.sun.jts.CosTransactions
//
// Author:      Simon Holdsworth
//
// Date:        March, 1997
//
// Copyright (c):   1995-1997 IBM Corp.
//
//   The source code for this program is not published or otherwise divested
//   of its trade secrets, irrespective of what has been deposited with the
//   U.S. Copyright Office.
//
//   This software contains confidential and proprietary information of
//   IBM Corp.
//----------------------------------------------------------------------------

package com.sun.jts.CosTransactions;

// Import required classes.

import org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.PortableServer.POAPackage.ServantAlreadyActive;
import org.omg.PortableServer.POAPackage.ServantNotActive;
import org.omg.CosTransactions.*;

import com.sun.jts.codegen.otsidl.*;

import com.sun.jts.trace.*;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;
import com.sun.jts.utils.LogFormatter;

/**The CoordinatorResourceImpl interface provides operations that allow a
 * Coordinator to be represented among the registered Resources of a
 * superior Coordinator, without requiring that the Coordinator support the
 * Resource interface.
 *
 * @version 0.02
 *
 * @author Simon Holdsworth, IBM Corporation
 *
 * @see
*/
//----------------------------------------------------------------------------
// CHANGE HISTORY
//
// Version By     Change Description
//   0.01  SAJH   Initial implementation.
//   0.02  GDH    Gordon Hutchison April 1998
//                Improved behaviour post recovery occurring
//-----------------------------------------------------------------------------

class CoordinatorResourceImpl extends CoordinatorResourcePOA
        implements CompletionHandler {
    private static POA poa = null;
    private static boolean recoverable = false;
    private CoordinatorResource thisRef = null;

    /**This flag may be set to indicate that the transaction is being forced.
     */
    boolean beingForced = false;

    private GlobalTID globalTID = null;
    private boolean   subtransaction = false;
    private boolean   aborted = false;
    private boolean   heuristicDamage = false;
    private boolean   completed = false;
    private boolean   setAsTerminator = false;

	/*
		Logger to log transaction messages
	*/
	
	static Logger _logger = LogDomains.getLogger(CoordinatorResourceImpl.class, LogDomains.TRANSACTION_LOGGER);
    /**Normal constructor.
     * 

* Sets up the CoordinatorResourceImpl with the Coordinator reference and the * local transaction identifier so that the Resource can always find the * Coordinator to pass on the two-phase commit messages. *

* A flag is passed to indicate whether the CoordinatorResourceImpl represents * a subtransaction. * * @param globalTID The global transaction identifier. * @param coord The Coordinator for the transaction. * @param subtran Subtransaction indicator. * * @return * * @see */ CoordinatorResourceImpl( GlobalTID globalTID, CoordinatorImpl coord, boolean subtran ) { // Set up the instance variables to those values passed in. subtransaction = subtran; this.globalTID = globalTID; // Inform the Coordinator that this is the object that normally terminates // the transaction. if( coord != null ) coord.setTerminator(this); } /**Informs the CoordinatorResourceImpl object that the transaction it * represents has completed. *

* Flags indicate whether the transaction aborted, and whether there was * heuristic damage. * * @param aborted Indicates the transaction aborted. * @param heuristicDamage Indicates heuristic damage occurred. * * @return * * @see CompletionHandler */ public void setCompleted( boolean aborted, boolean heuristicDamage ) { // Record the information. completed = true; this.aborted = aborted; this.heuristicDamage = heuristicDamage; } /**Requests the prepare phase vote from the object. *

* This uses a private interface to pass the superior Coordinator's prepare request. * on to the Coordinator that registered the CoordinatorResourceImpl. *

* The result from the Coordinator is returned to the caller. * * @param * * @return The Coordinators vote. * * @exception SystemException The operation failed. * @exception HeuristicMixed Indicates that a participant voted to roll the * transaction back, but one or more others have already heuristically committed. * @exception HeuristicHazard Indicates that a participant voted to roll the * transaction back, but one or more others may have already heuristically * committed. * * @see Resource */ public Vote prepare() throws SystemException, HeuristicMixed, HeuristicHazard { Vote result = Vote.VoteRollback; // If no global identifier has been set up, we can do nothing but vote for // the transaction to be rolled back. if( globalTID == null ) { INTERNAL exc = new INTERNAL(MinorCode.NoGlobalTID, CompletionStatus.COMPLETED_NO); throw exc; } // Prepare operations should only come in for top-level transactions. if( subtransaction ) { INTERNAL exc = new INTERNAL(MinorCode.TopForSub, CompletionStatus.COMPLETED_NO); throw exc; } // If the transaction that this object represents has already been rolled // back, return a rollback vote. if (completed) { if (aborted) { result = Vote.VoteRollback; } else { result = Vote.VoteCommit; } } else { // Look up the Coordinator for the transaction. TopCoordinator coord = (TopCoordinator)RecoveryManager.getCoordinator(globalTID); // If there is a Coordinator, lock it for the duration of this operation. // If there is no Coordinator, return a rollback vote. if( coord != null ) synchronized( coord ) { // Get the Coordinator's vote. // If the Coordinator throws HeuristicMixed or HeuristicHazard, // allow them to percolate to the caller. result = coord.prepare(); // If the Coordinator has voted to roll the transaction back, then this // CoordinatorResourceImpl will not be called again. Ensure that the // Coordinator has rolled back. // If the Coordinator throws HeuristicMixed or HeuristicHazard, // allow them to percolate to the caller. if( result == Vote.VoteRollback ) coord.rollback(false); } } // If the Coordinator has voted to roll the transaction back, then this // CoordinatorResourceImpl will not be called again. // If a heuristic exception was thrown, this will be done in forget. if (result == Vote.VoteRollback) { destroy(); } return result; } /**Informs the object that the transaction is to be committed. *

* Passes the superior Coordinator's commit request on to the Coordinator that * registered the CoordinatorResourceImpl, using a private interface. *

* If the Coordinator does not raise any heuristic exception, the * CoordinatorResourceImpl destroys itself. * * @param * * @return * * @exception HeuristicRollback The transaction has already been rolled back. * @exception HeuristicMixed At least one participant in the transaction has * rolled back its changes. * @exception HeuristicHazard At least one participant in the transaction may * have rolled back its changes. * @exception NotPrepared The transaction has not yet been prepared. * @exception SystemException An error occurred. The minor code indicates * the reason for the exception. * * @see Resource */ public void commit() throws HeuristicRollback, HeuristicMixed, HeuristicHazard, NotPrepared, SystemException { // If no global identifier has been set up, we can do nothing. if( globalTID == null ) { INTERNAL exc = new INTERNAL(MinorCode.NoGlobalTID, CompletionStatus.COMPLETED_NO); throw exc; } // Commit operations should only come in for top-level transactions. if( subtransaction ) { INTERNAL exc = new INTERNAL(MinorCode.TopForSub, CompletionStatus.COMPLETED_NO); throw exc; } // If the transaction that this object represents has already been completed, // raise a heuristic exception if necessary. This object must wait for a // forget before destroying itself if it returns a heuristic exception. if( completed ) { if( aborted ) { heuristicDamage = true; HeuristicRollback exc = new HeuristicRollback(); throw exc; } else if( heuristicDamage ) { HeuristicMixed exc = new HeuristicMixed(); throw exc; } } else { // Look up the Coordinator for the transaction. // GDH: First of all make sure it has been recovered if necessary if(_logger.isLoggable(Level.FINE)) { _logger.logp(Level.FINE,"CoordinatorResourceImpl","commit()", "Before invoking RecoveryManager.waitForRecovery():"+ "GTID is: "+ globalTID.toString()); } RecoveryManager.waitForRecovery(); TopCoordinator coord = (TopCoordinator)RecoveryManager.getCoordinator(globalTID); // If there is a Coordinator, lock it for the duration of this operation. // Tell the Coordinator to commit. // If the Coordinator throws HeuristicMixed or HeuristicHazard, // allow them to percolate to the caller. if( coord != null ) synchronized( coord ) { // GDH: // Make sure the coordinator knows we are it's terminator // (this is done here in case we are in a recovery situation) // (the operation has been moved from the constructor of the // this object to here as the constructor is now called // to early to ensure the coordinator is present in all // cases // GDH: // If the transaction has completed at this point the // makeSureSetAsTerminator method will be unable to // set the coordinators terminator and will throw // an object not exist exception: This is what we want in this case. makeSureSetAsTerminator(); coord.commit(); } } // If and we are not being forced, we can destroy ourselves before returning. // Otherwise, the TopCoordinator will have called setCompleted to set up // the information we need should a subsequent commit or rollback request // arrive. if( !beingForced ) destroy(); } /**Informs the object that the transaction is to be committed in one phase. *

* Passes the superior Coordinator's single-phase commit request on to the * Coordinator that registered the CoordinatorResourceImpl, using a private * interface. *

* The result from the Coordinator is returned to the caller. If the * Coordinator did not raise any heuristic exception, the CoordinatorResourceImpl * destroys itself. * * @param * * @return * * @exception TRANSACTION_ROLLEDBACK The transaction could not be committed and * has been rolled back. * @exception HeuristicHazard One or more resources in the transaction may have * rolled back. * @exception SystemException An error occurred. The minor code indicates * the reason for the exception. * * @see Resource */ public void commit_one_phase() throws TRANSACTION_ROLLEDBACK, HeuristicHazard, SystemException { boolean rolledBack; // If no global_identifier has been set up, we can do nothing. if( globalTID == null ) { INTERNAL exc = new INTERNAL(MinorCode.NoGlobalTID, CompletionStatus.COMPLETED_NO); throw exc; } // Commit operations should only come in for top-level transactions. if( subtransaction ) { INTERNAL exc = new INTERNAL(MinorCode.TopForSub, CompletionStatus.COMPLETED_NO); throw exc; } // If the transaction that this object represents has already been completed, // raise an exception if necessary. if( completed ) { if( aborted ) { TRANSACTION_ROLLEDBACK exc = new TRANSACTION_ROLLEDBACK(0,CompletionStatus.COMPLETED_NO); throw exc; } } else { // Look up the Coordinator for the transaction. // GDH: First of all make sure it has been recovered if necessary if(_logger.isLoggable(Level.FINE)) { _logger.logp(Level.FINE,"CoordinatorResourceImpl","commit_one_phase()", "Before invoking RecoveryManager.waitForRecovery(): "+ "GTID is: " + globalTID.toString()); } RecoveryManager.waitForRecovery(); TopCoordinator coord = (TopCoordinator)RecoveryManager.getCoordinator(globalTID); // If there is a Coordinator, lock it for the duration of this operation. // Tell the Coordinator to commit, by first doing a prepare. // If the Coordinator throws HeuristicMixed or HeuristicHazard, // allow them to percolate to the caller. if( coord != null ) { rolledBack = false; synchronized( coord ) { // GDH: // Make sure the coordinator knows we are it's terminator // (this is done here in case we are in a recovery situation) // (the operation has been moved from the constructor of the // this object to here as the constructor is now called // to early to ensure the coordinator is present in all // cases makeSureSetAsTerminator(); // The prepare operation may throw the HeuristicHazard exception. In this case // allow it to go back to the caller. Vote vote; try { vote = coord.prepare(); } catch( HeuristicMixed exc ) { throw new HeuristicHazard(); } try { if( vote == Vote.VoteCommit ) coord.commit(); else if (vote == Vote.VoteRollback) { // COMMENT (Ram J) 12/11/2000 The above if check // for rollback was added to avoid throwing a // rollback exception for readonly votes. coord.rollback(true); rolledBack = true; } } catch (Throwable exc) { // ADDED(Ram J) percolate any system exception // back to the caller. if (exc instanceof INTERNAL) { destroy(); throw (INTERNAL) exc; } } } } else { // coord is null // We could still find no coord that matched even after recovery // If there is still no coord then the process failed between // deleting the subordinate coordinator and the result being received // in the superior. As all of the recoverable work occurred in this // server or in its subordinate servers (we are in cop), from a data integrity point of // view, it does not matter what result the CoordinatorResource returns // to the superior. However, the superior may still have a client attached // and it would look strange if the transaction actually rolled back and // the TRANSACTION_ROLLEDBACK exception was not reported to the client. // Therefore we jump through hoops to give the best answer as possible. // By delaying the call to forget_superior until CoordinatorResource's // destructor we ensure the Coordinator and the CoordinatorResource are // deleted together (as much as is possible in the JAVA/CORBA environment) and // this occurs after the response has been sent to the superior (because // the ORB is holding a reference count to the CoordinatorResource). // Therefore, the most likely reason for this to occur is that the // Coordinator was timed out (and removed) just before the server // terminated. In this case, the transaction rolled back, which is the // response that will be returned. rolledBack = true; } if( rolledBack ) { destroy(); TRANSACTION_ROLLEDBACK exc = new TRANSACTION_ROLLEDBACK(0,CompletionStatus.COMPLETED_YES); throw exc; } } // Self-destruct before returning. destroy(); } /**Informs the object that the transaction is to be rolled back. *

* Passes the superior Coordinator's rollback request on to the Coordinator * that registered the CoordinatorResourceImpl, using a private interface. *

* If the Coordinator does not raise any heuristic exception, the * CoordinatorResourceImpl destroys itself. * * @param * * @return * * @exception HeuristicCommit The transaction has already been committed. * @exception HeuristicMixed At least one participant in the transaction has * committed its changes. * @exception HeuristicHazard At least one participant in the transaction may * have rolled back its changes. * @exception SystemException An error occurred. The minor code indicates * the reason for the exception. * * @see Resource *///---------------------------------------------------------------------------- public void rollback() throws HeuristicCommit, HeuristicMixed, HeuristicHazard, SystemException { // If no global identifier has been set up, we can do nothing. if( globalTID == null ) { INTERNAL exc = new INTERNAL(MinorCode.NoGlobalTID, CompletionStatus.COMPLETED_NO); throw exc; } // Rollback operations should only come in for top-level transactions. if( subtransaction ) { INTERNAL exc = new INTERNAL(MinorCode.TopForSub, CompletionStatus.COMPLETED_NO); throw exc; } // If the transaction that this object represents has already been completed, // raise a heuristic exception if necessary. This object must wait for a // forget before destroying itself if it returns a heuristic exception. if( completed ) { if( !aborted ) { heuristicDamage = true; HeuristicCommit exc = new HeuristicCommit(); throw exc; } else if( heuristicDamage ) { HeuristicMixed exc = new HeuristicMixed(); throw exc; } } else { // Look up the Coordinator for the transaction. // GDH: First of all make sure it has been recovered if necessary if(_logger.isLoggable(Level.FINE)) { _logger.logp(Level.FINE,"CoordinatorResourceImpl","rollback()", "Before invoking RecoveryManager.waitForRecovery(): "+ "GTID is : "+ globalTID.toString()); } RecoveryManager.waitForRecovery(); TopCoordinator coord = (TopCoordinator)RecoveryManager.getCoordinator(globalTID); // If there is a Coordinator, lock it for the duration of this operation. // Tell the Coordinator to rollback. // If the Coordinator throws HeuristicMixed or HeuristicHazard, // allow them to percolate to the caller. if( coord != null ) synchronized( coord ) { // GDH: // Make sure the coordinator knows we are it's terminator // (this is done here in case we are in a recovery situation) // (the operation has been moved from the constructor of the // this object to here as the constructor is now called // to early to ensure the coordinator is present in all // cases makeSureSetAsTerminator(); coord.rollback(true); } } // If we are not being forced, we can destroy ourselves before returning. // Otherwise, the TopCoordinator will have called set_completed to set up // the information we need should a subsequent commit or rollback request // arrive. if( !beingForced ) destroy(); } /**Informs the object that the transaction is to be forgotten. *

* Informs the CoordinatorResourceImpl that it does not need to retain heuristic * information any longer. * * @param * * @return * * @exception SystemException An error occurred. The minor code indicates * the reason for the exception. * * @see */ public void forget() throws SystemException { // Forget operations should only come in for top-level transactions. if( subtransaction ) { INTERNAL exc = new INTERNAL(MinorCode.TopForSub, CompletionStatus.COMPLETED_NO); throw exc; } // If no exception is raised, we can destroy ourselves before returning. destroy(); } /**Informs the object that the subtransaction is to be committed. *

* Passes the superior Coordinator's commit request on to the SubCoordinator * that registered the CoordinatorResourceImpl, using a private interface. *

* The result from the SubCoordinator is returned to the caller. The * CoordinatorResourceImpl destroys itself. * * @param parent The parent Coordinator reference. * * @return * * @exception TRANSACTION_ROLLEDBACK The transaction could not be committed * and some parts may have rolled back. * @exception SystemException An error occurred. The minor code indicates * the reason for the exception. * * @see */ public void commit_subtransaction( Coordinator parent ) throws TRANSACTION_ROLLEDBACK, SystemException { // If no global identifier has been set up, we can do nothing. if( globalTID == null ) { INTERNAL exc = new INTERNAL(MinorCode.NoGlobalTID, CompletionStatus.COMPLETED_NO); throw exc; } // Commit_subtransaction operations should only come in for subtransactions. if( !subtransaction ) { INTERNAL exc = new INTERNAL(MinorCode.SubForTop, CompletionStatus.COMPLETED_NO); throw exc; } // If the transaction that this object represents has already been rolled // back, raise the TRANSACTION_ROLLEDBACK exception. if( completed ) { if( aborted ) { destroy(); TRANSACTION_ROLLEDBACK exc = new TRANSACTION_ROLLEDBACK(0,CompletionStatus.COMPLETED_YES); throw exc; } } else { // Look up the Coordinator for the subtransaction. SubCoordinator coord = (SubCoordinator)RecoveryManager.getCoordinator(globalTID); // If there is a Coordinator, lock it for the duration of this operation. // Tell the Coordinator to prepare then commit. // Record then ignore any exceptions - we do not expect heuristics during // subtransaction completion. if( coord != null ) { boolean rolledBack = false; synchronized( coord ) { try { if( coord.prepare() == Vote.VoteCommit ) coord.commit(); else { coord.rollback(true); rolledBack = true; } } catch( Throwable ex ) { } } if( rolledBack ) { destroy(); TRANSACTION_ROLLEDBACK exc = new TRANSACTION_ROLLEDBACK(0,CompletionStatus.COMPLETED_YES); throw exc; } } } // Destroy ourselves before returning (there is no heuristic information for // subtransactions). destroy(); } /**Informs the object that the subtransaction is to be rolled back. *

* Passes the superior Coordinator's rollback request on to the SubCoordinator * that registered the CoordinatorResourceImpl, using a private interface. *

* The result from the SubCoordinator is returned to the caller. The * CoordinatorResourceImpl destroys itself. * * @param * * @return * * @exception SystemException An error occurred. The minor code indicates * the reason for the exception. * * @see */ public void rollback_subtransaction() throws SystemException { // If no global identifier has been set up, we can do nothing. if( globalTID == null ) { INTERNAL exc = new INTERNAL(MinorCode.NoGlobalTID, CompletionStatus.COMPLETED_NO); throw exc; } // Commit_subtransaction operations should only come in for subtransactions. if( !subtransaction ) { INTERNAL exc = new INTERNAL(MinorCode.SubForTop, CompletionStatus.COMPLETED_NO); throw exc; } // If the transaction that this object represents has already been completed, // do nothing. if( !completed ) { // Look up the Coordinator for the transaction. SubCoordinator coord = (SubCoordinator)RecoveryManager.getCoordinator(globalTID); // If there is a Coordinator, lock it for the duration of this operation. // Tell the Coordinator to rollback. if( coord != null ) synchronized( coord ) { coord.rollback(true); } } // Destroy ourselves before returning (there is no heuristic information for // subtransactions). destroy(); } /**Creates the CoordinatorResourceImpl with the given key. This is done when * the CoordinatorResource object is recreated after the server has been * restarted. * * @param key The key for the object. * * @return * * @see */ CoordinatorResourceImpl( byte[] key ) { // Get the global transaction identifier from the key. globalTID = new GlobalTID(key); // GDH // Ensure that recovery has completed so that we can get the Coordinator. // This is now delayed until the 2PC methods for normal resync and is // done as part of the superinfo.reconst // RecoveryManager.waitForRecovery(); // Check that the global transaction identifier represents a known transaction. // If it does not, then throw the OBJECT_NOT_EXIST exception. // CoordinatorImpl coord = RecoveryManager.getCoordinator(globalTID); // if( coord == null ) // { // OBJECT_NOT_EXIST exc = new OBJECT_NOT_EXIST(); // if( trc != null ) trc.event(EVT_THROW).data(exc).write(); // throw exc; // } // If the transaction is known, then inform the Coordinator that this is the // terminator for it. // else // coord.setTerminator(this); // Leave other members at the default values. } /**Returns the CORBA Object which represents this object. * * @param * * @return The CORBA object. * * @see */ CoordinatorResource object() { if( thisRef == null ) { if( poa == null ) { poa = Configuration.getPOA("CoordinatorResource"/*#Frozen*/); recoverable = Configuration.isRecoverable(); } try { byte[] id = null; if (recoverable && globalTID != null) { id = globalTID.toBytes(); poa.activate_object_with_id(id, this); org.omg.CORBA.Object obj = poa.create_reference_with_id(id, CoordinatorResourceHelper.id()); thisRef = CoordinatorResourceHelper.narrow(obj); //thisRef = (CoordinatorResource) this; } else { poa.activate_object(this); org.omg.CORBA.Object obj = poa.servant_to_reference(this); thisRef = CoordinatorResourceHelper.narrow(obj); //thisRef = (CoordinatorResource) this; } } catch( ServantAlreadyActive saexc ) { _logger.log(Level.SEVERE, "jts.create_CoordinatorResource_object_error",saexc); String msg = LogFormatter.getLocalizedMessage(_logger, "jts.create_CoordinatorResource_object_error"); throw new org.omg.CORBA.INTERNAL(msg); } catch( ServantNotActive snexc ) { _logger.log(Level.SEVERE, "jts.create_CoordinatorResource_object_error",snexc); String msg = LogFormatter.getLocalizedMessage(_logger, "jts.create_CoordinatorResource_object_error"); throw new org.omg.CORBA.INTERNAL(msg); } catch( Exception exc ) { _logger.log(Level.SEVERE, "jts.create_CoordinatorResource_object_error",exc); String msg = LogFormatter.getLocalizedMessage(_logger, "jts.create_CoordinatorResource_object_error"); throw new org.omg.CORBA.INTERNAL(msg); } } return thisRef; } /**Destroys the CoordinatorResourceImpl object. * * @param * * @return * * @see */ void destroy() { try { if (poa != null && thisRef != null) { poa.deactivate_object(poa.reference_to_id(thisRef)); thisRef = null; } else { // BUGFIX(Ram J) It is possible that the // CoordinatorResource object was activated via the activation // daemon. In that case, there is no guarantee // that poa and thisRef are set to a meaningful value. // So, try to deactivate the CoordinatorResource object anyway. POA crPoa = null; if (poa == null) { crPoa = Configuration.getPOA("CoordinatorResource"/*#Frozen*/); } else { crPoa = poa; } if (thisRef == null) { crPoa.deactivate_object(crPoa.servant_to_id(this)); } else { crPoa.deactivate_object(crPoa.reference_to_id(thisRef)); thisRef = null; } } } catch( Exception exc ) { _logger.log(Level.WARNING,"jts.object_destroy_error","CoordinatorResource"); } globalTID = null; } /**Dumps the state of the object. * * @param * * @return * * @see */ void dump() { } /**Makes sure this object is set as the Coordinator Terminator * * @param * * @return * * @see */ void makeSureSetAsTerminator() { if( !setAsTerminator ) { CoordinatorImpl coord = RecoveryManager.getCoordinator(globalTID); // If the transaction is not known then throw an exception, // otherwise inform the Coordinator that this is the // terminator for it. if( coord == null ) { OBJECT_NOT_EXIST exc = new OBJECT_NOT_EXIST(); throw exc; } else { coord.setTerminator(this); setAsTerminator = true; } } } // MakeSureSetAsTerminator method } // class





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