/**
* Copyright (C) 2000-2010 Atomikos <info@atomikos.com>
*
* 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.util.Enumeration;
import java.util.Hashtable;
import java.util.Stack;
import java.util.Vector;
import com.atomikos.icatch.HeurCommitException;
import com.atomikos.icatch.HeurHazardException;
import com.atomikos.icatch.HeurMixedException;
/**
* A result for prepare messages.
*/
class PrepareResult extends Result
{
protected Hashtable readonlytable_ = new Hashtable ();
// for read only voters
protected Hashtable indoubts_ = new Hashtable ();
// for indoubt participants
// should be rolled back in case of failure!
protected Hashtable heuristics_ = new Hashtable ();
protected boolean analyzed_ = false;
protected Vector msgvector_ = new Vector ();
/**
* Constructor.
*
* @param count
* The number of replies to deal with.
*/
public PrepareResult ( int count )
{
super ( count );
}
protected synchronized void calculateResultFromAllReplies () throws IllegalStateException,
InterruptedException
{
if ( analyzed_ )
return;
boolean allReadOnly = true;
boolean allYes = true;
boolean heurmixed = false;
boolean heurhazards = false;
boolean heurcommits = false;
Stack replies = getReplies ();
Enumeration enumm = replies.elements ();
while ( enumm.hasMoreElements () ) {
boolean yes = false;
boolean readonly = false;
Reply reply = (Reply) enumm.nextElement ();
if ( reply.hasFailed () ) {
yes = false;
readonly = false;
Exception err = reply.getException ();
if ( err instanceof HeurMixedException ) {
heurmixed = true;
HeurMixedException hm = (HeurMixedException) err;
addMessages ( hm.getHeuristicMessages () );
} else if ( err instanceof HeurCommitException ) {
heurcommits = true;
HeurCommitException hc = (HeurCommitException) err;
addMessages ( hc.getHeuristicMessages () );
heurmixed = (heurmixed || heurhazards);
} else if ( err instanceof HeurHazardException ) {
heurhazards = true;
heurmixed = (heurmixed || heurcommits);
HeurHazardException hr = (HeurHazardException) err;
indoubts_.put ( reply.getParticipant (),
new Boolean ( true ) );
// REMEMBER: might be indoubt, so HAS to be notified
// during rollback!
addMessages ( hr.getHeuristicMessages () );
}
}// if failed
else {
readonly = (reply.getResponse () == null);
Boolean answer = new Boolean ( false );
if ( !readonly ) {
answer = (Boolean) reply.getResponse ();
}
yes = (readonly || answer.booleanValue ());
// if readonly: remember this fact for logging and second phase
if ( readonly )
readonlytable_.put ( reply.getParticipant (), new Boolean (
true ) );
else
indoubts_.put ( reply.getParticipant (),
new Boolean ( true ) );
}
allYes = (allYes && yes);
allReadOnly = (allReadOnly && readonly);
}
if ( heurmixed )
result_ = HEUR_MIXED;
else if ( heurcommits )
result_ = HEUR_COMMIT;
else if ( heurhazards )
result_ = HEUR_HAZARD;
else if ( allReadOnly )
result_ = ALL_READONLY;
else if ( allYes )
result_ = ALL_OK;
analyzed_ = true;
}
/**
* Test if all answers represent a yes vote. Blocks until all results
* arrived.
*
* @return boolean True if all are yes, false if not.
* @exception InterruptedException
* If interrupt on wait.
*/
public boolean allYes () throws InterruptedException
{
calculateResultFromAllReplies ();
return (result_ == ALL_OK || result_ == ALL_READONLY);
}
/**
* Test if all answers were readonly votes. Blocks till all results known.
*
* @return boolean True if all readonly, false otherwise.
* @exception InterruptedException
* If interrupted.
*/
public boolean allReadOnly () throws InterruptedException
{
calculateResultFromAllReplies ();
return (result_ == ALL_READONLY);
}
/**
* Get a table of readonly voting participants.
*
* @return Hashtable Contains a key per readonly participant.
* @exception InterruptedException
* If interrupted on wait.
*/
public Hashtable getReadOnlyTable () throws InterruptedException
{
calculateResultFromAllReplies ();
return readonlytable_;
}
/**
* Get a table of indoubt participants, which have to be notified of commit
* or rollback.
*
* @return Hashtable A key per indoubt participant.
* @exception InterruptedException
* If interrupted on wait.
*/
public Hashtable getIndoubtTable () throws InterruptedException
{
calculateResultFromAllReplies ();
return indoubts_;
}
}