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//----------------------------------------------------------------------------
//
// Module: RecoveryCoordinatorImpl.java
//
// Description: Transaction RecoveryCoordinator object implementation.
//
// 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 org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.CosTransactions.*;
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 RecoveryCoordinatorImpl interface is our implementation of the standard
* RecoveryCoordinator interface. It allows recoverable objects to drive the
* recovery process in certain situations. Each instance of this class is
* implicitly associated with a single resource registration, and may only be
* used by that resource in that particular transaction for which it is
* registered. An instance of this class should be accessed from only one
* thread within a process.
*
* @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
// Added in COMMITTING to replay_completion
//-----------------------------------------------------------------------------
class RecoveryCoordinatorImpl extends RecoveryCoordinatorPOA {
private static boolean recoverable = false;
private static POA poa = null;
private RecoveryCoordinator thisRef = null;
private int internalSeq = 0;
/*
Logger to log transaction messages
*/
static Logger _logger = LogDomains.getLogger(RecoveryCoordinatorImpl.class, LogDomains.TRANSACTION_LOGGER);
GlobalTID globalTID = null;
RecoveryCoordinatorImpl() {}
/**
* Sets up the RecoveryCoordinator with the global identifier.
*
* This is so that it can always find the Coordinator to inform it of the
* requirement for recovery of the given Resource.
*
* An internal sequence number is used to differentiate RecoveryCoordinator
* objects used for the same Coordinator object within a process. This is
* so that they each get a unique object identifier.
*
* @param globalTID The global transaction identifier.
* @param sequence An internal sequence number to differentiate objects.
*
* @return
*
* @see
*/
RecoveryCoordinatorImpl(GlobalTID globalTID, int sequence) {
this.globalTID = globalTID;
internalSeq = sequence;
// MODIFICATION (Ram Jeyaraman) comment out the code
// below, as it does nothing.
/*
byte[] tidBytes = globalTID.toBytes();
byte[] id = new byte[tidBytes.length + 4];
System.arraycopy(tidBytes, 0, id, 4, tidBytes.length);
id[0] = (byte) internalSeq;
id[1] = (byte)(internalSeq >> 8);
id[2] = (byte)(internalSeq >> 16);
id[3] = (byte)(internalSeq >> 24);
*/
}
/**
* Informs the Transaction Service that the given Resource object has been
* prepared but has not received a commit or rollback operation.
*
* If the transaction outcome is unknown, the Resource object passed
* on this operation will be called at some later time for
* commit or rollback.
*
* @param res The Resource to be recovered.
*
* @return The state of the transaction.
*
* @exception NotPrepared The transaction for which the
* RecoveryCoordinator was created has not prepared.
*
* @see
*/
public Status replay_completion(Resource res) throws NotPrepared {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryCoordinatorImpl",
"replay_completion()","replay_completion on Resource:"+
res);
}
Status result = Status.StatusRolledBack;
CoordinatorImpl coord = RecoveryManager.getCoordinator(globalTID);
if (coord != null) {
try {
result = coord.get_status();
} catch (SystemException exc) {}
}
switch (result.value()) {
/*
* If the transaction is still active, raise the NotPrepared
* exception. The Coordinator must be marked rollback-only at
* this point because we cannot allow the transaction to
* complete if a participant has failed.
*/
case Status._StatusActive :
case Status._StatusMarkedRollback :
try {
coord.rollback_only();
} catch (Throwable exc) {}
throw new NotPrepared();
/*
* If the transaction is prepared, the caller must wait for the
* Coordinator to tell it what to do, so return an unknown status, and
* do nothing. Note that if this Coordinator is sitting waiting for
* its superior, this could take a int time.
*/
case Status._StatusPrepared :
result = Status.StatusUnknown;
break;
/*
* If the transaction has been committed, the caller will receive
* a commit.
*
* GDH If the transaction is commiting then we pass this on
* to the caller. This state (added in OTS 1.1 means that
* TopCoordinator.recover must now accept the COMMITTING state.
*/
case Status._StatusCommitting :
// MODIFICATION (Ram Jeyaraman) commented out the code below,
// since a StatusCommitting will be upgraded to Committed in
// the subordinate.
/*
// (Ram Jeyaraman) let the subordinate wait, and allow the root
// finish driving the commit.
result = Status.StatusUnknown;
*/
break;
case Status._StatusCommitted :
break;
case Status._StatusRolledBack :
// If the transaction has been rolled back, and there is
// no Coordinator for the transaction, we must invoke rollback
// directly, as it will not be done otherwise. However for
// proxies, this rollback cannot be done from this thread as
// it would cause deadlock in the server requesting resync.
if (coord == null) {
if (!Configuration.getProxyChecker().isProxy(res)) {
rollbackOrphan(res);
} else {
// We must pass a duplicate of the proxy to the
// rollback thread because this proxy will be destroyed
// when the replay_completion request returns
// to the remote server.
try {
OrphanRollbackThread rollbackThread =
new OrphanRollbackThread(
this, (Resource) res._duplicate());
rollbackThread.start();
} catch (SystemException exc) {}
}
}
break;
/*
* In any other situation, assume that the transaction has been rolled
* back. As there is a Coordinator, it will direct the Resource to roll
* back.
*/
default :
result = Status.StatusRolledBack;
}
return result;
}
// same as replay_completion(res) : added for delegated recovery support
public Status replay_completion(Resource res, String logPath) throws NotPrepared {
if(_logger.isLoggable(Level.FINE))
{
_logger.logp(Level.FINE,"RecoveryCoordinatorImpl",
"replay_completion()","replay_completion on Resource:"+ res);
}
Status result = Status.StatusRolledBack;
CoordinatorImpl coord = DelegatedRecoveryManager.getCoordinator(globalTID, logPath);
if (coord != null) {
try {
result = coord.get_status();
} catch (SystemException exc) {}
}
switch (result.value()) {
/*
* If the transaction is still active, raise the NotPrepared
* exception. The Coordinator must be marked rollback-only at
* this point because we cannot allow the transaction to
* complete if a participant has failed.
*/
case Status._StatusActive :
case Status._StatusMarkedRollback :
try {
coord.rollback_only();
} catch (Throwable exc) {}
throw new NotPrepared();
/*
* If the transaction is prepared, the caller must wait for the
* Coordinator to tell it what to do, so return an unknown status, and
* do nothing. Note that if this Coordinator is sitting waiting for
* its superior, this could take a int time.
*/
case Status._StatusPrepared :
result = Status.StatusUnknown;
break;
/*
* If the transaction has been committed, the caller will receive
* a commit.
*
* GDH If the transaction is commiting then we pass this on
* to the caller. This state (added in OTS 1.1 means that
* TopCoordinator.recover must now accept the COMMITTING state.
*/
case Status._StatusCommitting :
// MODIFICATION (Ram Jeyaraman) commented out the code below,
// since a StatusCommitting will be upgraded to Committed in
// the subordinate.
/*
// (Ram Jeyaraman) let the subordinate wait, and allow the root
// finish driving the commit.
result = Status.StatusUnknown;
*/
break;
case Status._StatusCommitted :
break;
case Status._StatusRolledBack :
// If the transaction has been rolled back, and there is
// no Coordinator for the transaction, we must invoke rollback
// directly, as it will not be done otherwise. However for
// proxies, this rollback cannot be done from this thread as
// it would cause deadlock in the server requesting resync.
if (coord == null) {
if (!Configuration.getProxyChecker().isProxy(res)) {
rollbackOrphan(res);
} else {
// We must pass a duplicate of the proxy to the
// rollback thread because this proxy will be destroyed
// when the replay_completion request returns
// to the remote server.
try {
OrphanRollbackThread rollbackThread =
new OrphanRollbackThread(
this, (Resource) res._duplicate());
rollbackThread.start();
} catch (SystemException exc) {}
}
}
break;
/*
* In any other situation, assume that the transaction has been rolled
* back. As there is a Coordinator, it will direct the Resource to roll
* back.
*/
default :
result = Status.StatusRolledBack;
}
return result;
}
/**
* This method invoked rollback on the Resource that is passed as a
* parameter.
*
* This procedure may be called as the main procedure of a new thread,
* which must be done for remote Resource objects
* during resync to avoid the possibility of deadlock during resync.
*
*
* It is called directly when the Resource is not a proxy.
*
* @param res The Resource to be rolled back.
*
* @return
*
* @see
*/
void rollbackOrphan(Resource res) {
try {
res.rollback();
} catch(Throwable exc) {
// If the rollback raised a heuristic exception, it can
// only be reported in a message as it will never reach
// the Coordinator.
if (exc instanceof HeuristicCommit ||
exc instanceof HeuristicMixed ||
exc instanceof HeuristicHazard) {
_logger.log(Level.WARNING,"jts.heuristic_exception",exc.toString());
} else {}
}
// We must release the proxy now.
res._release();
}
/**
* Creates the RecoveryCoordinatorImpl with the given key.
*
* This is done when the RecoveryCoordinator object is recreated after the
* server has been restarted.
*
* The first four bytes of the key are an internal sequence number used to
* differentiate RecoveryCoordinator objects created in the
* same process for the same transaction.
*
* The rest of the key is the global transaction identifier.
*
* @param key The key for the object.
*
* @return
*
* @see
*/
RecoveryCoordinatorImpl(byte[] key) {
// Get the global transaction identifier from the key.
byte[] tidBytes = new byte[key.length - 4];
// BUGFIX (Ram Jeyaraman) changed the order of array copy.
// previously, an source and destination array was wrong.
//System.arraycopy(tidBytes, 0, key, 4, tidBytes.length);
System.arraycopy(key, 4, tidBytes, 0, tidBytes.length);
globalTID = new GlobalTID(tidBytes);
// Ensure that recovery has completed so that
// we can get the Coordinator.
RecoveryManager.waitForRecovery();
// Leave other members at the default values.
}
/**
* Returns the CORBA Object which represents this object.
*
* @param
*
* @return The CORBA object.
*
* @see
*/
synchronized final RecoveryCoordinator object() {
if (thisRef == null) {
if (poa == null) {
poa = Configuration.getPOA("RecoveryCoordinator"/*#Frozen*/);
recoverable = Configuration.isRecoverable();
}
try {
if (recoverable && globalTID != null) {
// Create the object id from the global transaction
// identifier and the internal sequence number.
byte[] tidBytes = globalTID.toBytes();
byte[] id = new byte[tidBytes.length + 4];
System.arraycopy(tidBytes, 0, id, 4, tidBytes.length);
id[0] = (byte) internalSeq;
id[1] = (byte)(internalSeq >> 8);
id[2] = (byte)(internalSeq >> 16);
id[3] = (byte)(internalSeq >> 24);
// Activate the object and create the reference.
poa.activate_object_with_id(id, this);
org.omg.CORBA.Object obj =
poa.create_reference_with_id(
id, RecoveryCoordinatorHelper.id());
thisRef = RecoveryCoordinatorHelper.narrow(obj);
//thisRef = (RecoveryCoordinator) this;
} else {
poa.activate_object(this);
org.omg.CORBA.Object obj = poa.servant_to_reference(this);
thisRef = RecoveryCoordinatorHelper.narrow(obj);
//thisRef = (RecoveryCoordinator)this;
}
} catch(Exception exc) {
_logger.log(Level.SEVERE,"jts.create_recoverycoordinator_error");
String msg = LogFormatter.getLocalizedMessage(_logger,
"jts.create_recoverycoordinator_error");
throw new org.omg.CORBA.INTERNAL(msg);
}
}
return thisRef;
}
/**
* Destroys the RecoveryCoordinatorImpl object.
*
* @param
*
* @return
*
* @see
*/
synchronized final 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
// RecoveryCoordinator 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 RecoveryCoordinator object anyway.
POA rcPoa = null;
if (poa == null) {
rcPoa = Configuration.getPOA("RecoveryCoordinator"/*#Frozen*/);
} else {
rcPoa = poa;
}
if (thisRef == null) {
rcPoa.deactivate_object(rcPoa.servant_to_id(this));
} else {
rcPoa.deactivate_object(rcPoa.reference_to_id(thisRef));
thisRef = null;
}
}
} catch( Exception exc ) {
_logger.log(Level.WARNING,"jts.object_destroy_error","RecoveryCoordinator");
}
globalTID = null;
internalSeq = 0;
}
}
/**
* This class is provided to allow a Resource to be rolled back by the
* RecoveryCoordinator on a new thread. This is required for
* Resource objects which are proxies because deadlock would occur
* if the rollback was called from the same thread as the one on
* which the replay_completion was executing.
*
* @version 0.01
*
* @author Simon Holdsworth, IBM Corporation
*
* @see
*/
class OrphanRollbackThread extends Thread {
Resource resource = null;
RecoveryCoordinatorImpl recovery = null;
/**
* OrphanRollbackThread constructor.
*
* @param recovery
* @param resource
*
* @return
*
* @see
*/
OrphanRollbackThread(RecoveryCoordinatorImpl recovery,
Resource resource) {
this.resource = resource;
this.recovery = recovery;
setName("JTS Orphan Rollback Thread"/*#Frozen*/);
}
/**
* Calls the RecoveryCoordinator to rollback the Resource.
*
* @param
*
* @return
*
* @see
*/
public void run() {
recovery.rollbackOrphan(resource);
}
}