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/**
* Copyright (C) 2000-2012 Atomikos
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*/
package com.atomikos.icatch.imp;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import com.atomikos.icatch.HeurCommitException;
import com.atomikos.icatch.HeurHazardException;
import com.atomikos.icatch.HeurMixedException;
import com.atomikos.icatch.HeurRollbackException;
import com.atomikos.icatch.HeuristicMessage;
import com.atomikos.icatch.Participant;
import com.atomikos.icatch.RollbackException;
import com.atomikos.icatch.SysException;
import com.atomikos.icatch.TxState;
import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
/**
* A state handler for the indoubt coordinator state.
*/
public class IndoubtStateHandler extends CoordinatorStateHandler
{
private static final Logger LOGGER = LoggerFactory.createLogger(IndoubtStateHandler.class);
private static final long serialVersionUID = 7541858185410144702L;
private int inquiries_;
// how many timeout events have happened?
// if max allowed -> take heuristic decision
private boolean recovered_;
// useful in the case of a non-recovered ROOT, which needs to
// timeout to a heuristic state since the client terminator
// will not receive the outcome!
public IndoubtStateHandler() {
}
IndoubtStateHandler ( CoordinatorImp coordinator )
{
super ( coordinator );
inquiries_ = 0;
recovered_ = false;
}
IndoubtStateHandler ( CoordinatorStateHandler previous )
{
super ( previous );
inquiries_ = 0;
recovered_ = false;
}
protected void recover ( CoordinatorImp coordinator )
{
super.recover ( coordinator );
if ( getCoordinator ().getState ().equals ( TxState.COMMITTING ) ) {
// A coordinator that is still in this state might not have notified
// all its participants -> make sure replay happens
Enumeration enumm = getCoordinator ().getParticipants ().elements ();
Hashtable hazards = new Hashtable ();
while ( enumm.hasMoreElements () ) {
Participant p = (Participant) enumm.nextElement ();
if ( !getReadOnlyTable ().containsKey ( p ) ) {
addToHeuristicMap ( p, TxState.HEUR_HAZARD );
hazards.put ( p, TxState.HEUR_HAZARD );
}
}
HeurHazardStateHandler hazardStateHandler = new HeurHazardStateHandler (
this, hazards );
// set state to hazard AFTER having added all heuristic info,
// otherwise this info will NOT be in the log image!
getCoordinator ().setStateHandler ( hazardStateHandler );
// propagate recover notification to next state
hazardStateHandler.recover ( coordinator );
}
recovered_ = true;
}
protected TxState getState ()
{
return TxState.IN_DOUBT;
}
protected void onTimeout ()
{
// first check if we are still the current state!
// otherwise, a COMMITTING tx could be rolled back if it
// times out in between (i.e. a commit can come in while
// this state handler gets a timeout event and rolls back)
if ( !getCoordinator ().getState ().equals ( getState () ) ) return;
try {
if ( inquiries_ < getCoordinator ().getMaxIndoubtTicks () ) {
inquiries_++;
if ( inquiries_ >= getCoordinator ().getMaxIndoubtTicks () / 2 ) {
// WS-AT compliance: only ask for replay if half of timeout ticks has passed,
// to avoid hitting the coordinator with replays from the start
// (WS-T coordinator will abort if it receives a replay during preparing)
if ( getCoordinator ().getSuperiorRecoveryCoordinator () != null ) {
if(LOGGER.isInfoEnabled()){
LOGGER.logInfo("Requesting replayCompletion on behalf of coordinator "
+ getCoordinator ().getCoordinatorId ());
}
getCoordinator().getSuperiorRecoveryCoordinator().
replayCompletion ( getCoordinator () );
}
}
} else {
if ( getCoordinator ().getSuperiorRecoveryCoordinator () == null ) {
// root tx, where terminator did not issue commit after prepare -> decide abort.
// NOTE: if not recovered then this is a heuristic decision
// because the decision needs to be detectable
// by the client terminator.
// otherwise, state would be TERMINATED, and a late
// commit from terminator would return OK -> BAD!
rollbackWithAfterCompletionNotification(new RollbackCallback() {
public HeuristicMessage[] doRollback()
throws HeurCommitException,
HeurMixedException, SysException,
HeurHazardException, IllegalStateException {
return rollbackFromWithinCallback(true,!recovered_);
}});
}
// heuristic decision
else if ( getCoordinator ().prefersHeuristicCommit () ) {
commitWithAfterCompletionNotification ( new CommitCallback() {
public HeuristicMessage[] doCommit()
throws HeurRollbackException, HeurMixedException,
HeurHazardException, IllegalStateException,
RollbackException, SysException {
return commitFromWithinCallback ( true, false );
}
});
} else {
rollbackWithAfterCompletionNotification(new RollbackCallback() {
public HeuristicMessage[] doRollback()
throws HeurCommitException,
HeurMixedException, SysException,
HeurHazardException, IllegalStateException {
return rollbackFromWithinCallback(true,true);
}});
}
} // else
} catch ( Exception e ) {
LOGGER.logWarning("Error in timeout of INDOUBT state: " + e.getMessage () );
}
}
protected void setGlobalSiblingCount ( int count )
{
}
protected int prepare () throws RollbackException,
java.lang.IllegalStateException, HeurHazardException,
HeurMixedException, SysException
{
// if we have a repeated prepare in this state, then the
// first prepare must have been a YES vote, otherwise we
// would not be in-doubt! -> repeat the same vote
// (required for WS-AT)
return Participant.READ_ONLY + 1;
}
protected HeuristicMessage[] commit ( boolean onePhase )
throws HeurRollbackException, HeurMixedException,
HeurHazardException, java.lang.IllegalStateException,
RollbackException, SysException
{
return commitWithAfterCompletionNotification ( new CommitCallback() {
public HeuristicMessage[] doCommit()
throws HeurRollbackException, HeurMixedException,
HeurHazardException, IllegalStateException,
RollbackException, SysException {
return commitFromWithinCallback ( false, false );
}
});
}
protected HeuristicMessage[] rollback ()
throws HeurCommitException, HeurMixedException, SysException,
HeurHazardException, java.lang.IllegalStateException
{
return rollbackWithAfterCompletionNotification(new RollbackCallback() {
public HeuristicMessage[] doRollback()
throws HeurCommitException,
HeurMixedException, SysException,
HeurHazardException, IllegalStateException {
return rollbackFromWithinCallback(true,false);
}});
}
@Override
public void writeData(DataOutput out) throws IOException {
super.writeData(out);
out.writeInt(inquiries_);
out.writeBoolean(recovered_);
}
@Override
public void readData(DataInput in) throws IOException {
super.readData(in);
inquiries_=in.readInt();
recovered_=in.readBoolean();
}
}
