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com.atomikos.icatch.imp.CoordinatorLogImage Maven / Gradle / Ivy
/**
* Copyright (C) 2000-2010 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.io.InvalidClassException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Vector;
import com.atomikos.icatch.DataSerializable;
import com.atomikos.icatch.Participant;
import com.atomikos.icatch.RecoveryCoordinator;
import com.atomikos.icatch.TxState;
import com.atomikos.persistence.ObjectImage;
import com.atomikos.persistence.Recoverable;
import com.atomikos.util.ClassLoadingHelper;
/**
*
*
* A log image for CoordinatorImp instances.
*/
public class CoordinatorLogImage implements ObjectImage,DataSerializable
{
// force serial version UID for backward log compatibility
static final long serialVersionUID = 3404629869531420208L;
String root_;
TxState state_;
boolean heuristicCommit_;
// what to do on timeout of indoubt: commit or not
Vector participants_;
// all participants known for this coordinator.
RecoveryCoordinator coordinator_;
// the recovery coordinator; null if root.
long maxInquiries_;
// max no of indoubt inquiries before heuristic
CoordinatorStateHandler stateHandler_;
boolean activity_;
//activity or not
int localSiblingCount_;
//for activity: active state to recover
boolean checkSiblings_;
//for activity: active state to recover
boolean single_threaded_2pc_;
//2PC without threads desired?
/**
* Required by Externalizable interface.
*/
public CoordinatorLogImage ()
{
}
/**
* Constructor for non-activities.
*
* @param root
* @param state
* @param participants
* @param coordinator
* @param commit_on_heuristic
* @param maxinquiries
* @param stateHandler
* @param single_threaded_2pc
*/
public CoordinatorLogImage ( String root , TxState state ,
Vector participants , RecoveryCoordinator coordinator ,
boolean commit_on_heuristic , long maxinquiries ,
CoordinatorStateHandler stateHandler , boolean single_threaded_2pc )
{
root_ = root;
state_ = state;
participants_ = participants;
coordinator_ = coordinator;
heuristicCommit_ = commit_on_heuristic;
maxInquiries_ = maxinquiries;
stateHandler_ = stateHandler;
activity_ = false;
localSiblingCount_ = 0;
checkSiblings_ = false;
single_threaded_2pc_ = single_threaded_2pc;
}
/**
* Constructor for activities in active state.
*
* @param root
* @param state
* @param participants
* @param coordinator
* @param commit_on_heuristic
* @param maxinquiries
* @param stateHandler
* @param localSiblingCount
* @param checkSiblings
* @param single_threaded_2pc
*/
public CoordinatorLogImage ( String root , TxState state ,
Vector participants , RecoveryCoordinator coordinator ,
boolean commit_on_heuristic , long maxinquiries ,
CoordinatorStateHandler stateHandler , int localSiblingCount ,
boolean checkSiblings , boolean single_threaded_2pc
)
{
this ( root , state , participants , coordinator , commit_on_heuristic ,
maxinquiries , stateHandler , single_threaded_2pc );
activity_ = true;
localSiblingCount_ = localSiblingCount;
checkSiblings_ = checkSiblings;
}
public Object getId ()
{
return root_;
}
public void writeExternal ( ObjectOutput out ) throws IOException
{
// make sure to CLONE all objects, to avoid that
// subsequent calls do NOT re-write the objects
// (SERIALIZATION!)
out.writeObject ( root_ );
out.writeObject ( state_ );
out.writeObject ( participants_.clone () );
if ( coordinator_ == null )
out.writeBoolean ( false );
else {
out.writeBoolean ( true );
out.writeObject ( coordinator_ );
}
out.writeBoolean ( heuristicCommit_ );
out.writeLong ( maxInquiries_ );
out.writeObject ( stateHandler_.clone () );
out.writeBoolean ( activity_ );
if ( activity_ ) {
out.writeInt ( localSiblingCount_ );
out.writeBoolean ( checkSiblings_ );
}
out.writeBoolean ( single_threaded_2pc_ );
}
public void readExternal ( ObjectInput in ) throws IOException,
ClassNotFoundException
{
try {
root_ = (String) in.readObject ();
state_ = (TxState) in.readObject ();
participants_ = (Vector) in.readObject ();
boolean readcoord = in.readBoolean ();
if ( readcoord )
coordinator_ = (RecoveryCoordinator) in.readObject ();
heuristicCommit_ = in.readBoolean ();
maxInquiries_ = in.readLong ();
stateHandler_ = (CoordinatorStateHandler) in.readObject ();
activity_ = in.readBoolean();
if ( activity_ ) {
localSiblingCount_ = in.readInt();
checkSiblings_ = in.readBoolean();
}
single_threaded_2pc_ = in.readBoolean();
} catch (InvalidClassException ex) {
// fix for 22174
throw (IOException) new IOException ( "Object of class " + ex.classname + " in transaction log" +
" not compatible with version found in classpath" ).initCause(ex);
}
}
public Recoverable restore ()
{
CoordinatorImp coord = new CoordinatorImp ();
coord.restore ( this );
return coord;
}
public void writeData(DataOutput out) throws IOException {
out.writeUTF(root_);
out.writeUTF(state_.toString());
// instead of: out.writeObject ( participants_.clone () );
out.writeBoolean(heuristicCommit_);
out.writeLong(maxInquiries_);
out.writeUTF(stateHandler_.getClass().getName());
((DataSerializable) stateHandler_).writeData(out);
// instead of: out.writeObject ( stateHandler_.clone () );
out.writeBoolean(activity_);
if (activity_) {
out.writeInt(localSiblingCount_);
out.writeBoolean(checkSiblings_);
}
out.writeBoolean(single_threaded_2pc_);
if (coordinator_ == null)
out.writeBoolean(false);
else {
out.writeBoolean(true);
out.writeUTF(coordinator_.getClass().getName());
// FIXME: Work with Guy for a better understanding on what to do here :
// Does all Impl of RecoveryCoordinator must implement DataSerializable ???
// out.writeObject ( coordinator_ );
((DataSerializable)coordinator_).writeData(out);
}
if (participants_ != null) {
out.writeBoolean(true);
out.writeInt(participants_.size());
for (Object participant : participants_) {
out.writeUTF(participant.getClass().getName());
((DataSerializable) participant).writeData(out);
}
} else {
out.writeBoolean(false);
}
}
public void readData(DataInput in) throws IOException {
try {
root_ = in.readUTF();
String state = in.readUTF();
state_ = TxState.valueOf(state);
heuristicCommit_ = in.readBoolean();
maxInquiries_ = in.readLong();
String stateHandlerClassName=in.readUTF();
stateHandler_=(CoordinatorStateHandler) ClassLoadingHelper.newInstance(stateHandlerClassName);
stateHandler_.readData(in);
activity_ = in.readBoolean();
if (activity_) {
localSiblingCount_ = in.readInt();
checkSiblings_ = in.readBoolean();
}
single_threaded_2pc_ = in.readBoolean();
boolean hasCoordinator = in.readBoolean();
if(hasCoordinator){
String className=in.readUTF();
coordinator_=(RecoveryCoordinator)ClassLoadingHelper.newInstance(className);
((DataSerializable)coordinator_).readData(in);
}
boolean initialized = in.readBoolean();
if (initialized) {
participants_=new Vector();
// intead of: participants_ = (Vector) in.readObject ();
int size = in.readInt();
for (int i = 0; i < size; i++) {
String participantClassName=in.readUTF();
DataSerializable participant = (DataSerializable) ClassLoadingHelper.newInstance(participantClassName);
participant.readData(in);
participants_.add((Participant)participant);
}
}
} catch (InvalidClassException ex) {
// fix for 22174
throw (IOException) new IOException("Object of class " + ex.classname + " in transaction log" + " not compatible with version found in classpath").initCause(ex);
}
}
}
