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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.implementation.guardian.impl;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.Stack;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.tuscany.sca.implementation.guardian.common.GlobalExceptionInterface;
import org.apache.tuscany.sca.implementation.guardian.GuardianGroup;
import org.apache.tuscany.sca.implementation.guardian.GuardianMember;
import org.apache.tuscany.sca.implementation.guardian.common.Context;
import org.apache.tuscany.sca.implementation.guardian.common.GlobalException;
import org.apache.tuscany.sca.implementation.guardian.common.JoinException;
import org.apache.tuscany.sca.implementation.guardian.common.SuspendException;
import org.osoa.sca.annotations.Destroy;
import org.osoa.sca.annotations.Init;
import org.osoa.sca.annotations.Reference;
import org.osoa.sca.annotations.Scope;
import org.osoa.sca.annotations.Service;
@Service(GuardianMember.class)
@Scope("COMPOSITE")
public class GuardianMemberImpl implements GuardianMember {
private int participantState;
private Stack<Context> contextList;
private Queue<GlobalException> exceptionQueue;
@Reference(name = "guardian_group", required = true)
public GuardianGroup guardianGroup;
private int id;
//FIXME: Review the usage of this variable
private boolean exceptionThrown;
public GuardianMemberImpl() {
contextList = new Stack<Context>();
contextList.add(Context.INIT_CONTEXT);
exceptionQueue = new LinkedList<GlobalException>();
participantState = GuardianGroup.NORMAL_PARTICIPANT_STATE;
exceptionThrown = false;
}
@Init
public void init() {
guardianGroup.addGuardianMember(this);
}
@Destroy
public void destroy() {
guardianGroup.removeGuardianMember(this);
}
public void addException(GlobalException ex) {
exceptionQueue.add(ex);
}
public Context getCurrentContext() {
return contextList.peek();
}
public void enableContext(Context context) {
//Update the context list with the related set of exceptions
contextList.push(context);
if (contextList.size() == 2) {
JoinException ex = new JoinException();
ex.setSignalingContext(context);
ex.putSignalingParticipant(getParticipantIdentifier());
gthrow(ex, null);
}
}
public void removeContext() {
if (!contextList.isEmpty()) {
contextList.pop();
}
}
//If participantList is null then signal to ALL participants
public void gthrow(GlobalExceptionInterface ex, List<String> participantList) {
//1)Block the participant until raise an exception
if (!(ex instanceof SuspendException)) {
//Set the exception's parameters
ex.setSignalingContext(getCurrentContext());
ex.putSignalingParticipant(getParticipantIdentifier());
guardianGroup.gthrow(ex, participantList);
exceptionThrown = true;
} else {
setParticipantState(GuardianGroup.SUSPENDED_PARTICIPANT_STATE);
}
}
public boolean propagate(GlobalExceptionInterface ex) {
//1)Compares the current context with the exception's target context
return !getCurrentContext().equals(ex.getTargetContext());
}
public void checkExceptionStatus() throws GlobalException {
//Blocks until the state be diferent the SUSPENDED_STATE
while (participantState == GuardianGroup.SUSPENDED_PARTICIPANT_STATE && exceptionThrown) {
System.out.println(getParticipantIdentifier() + ": I am blocked!");
try {
Thread.sleep(5000);
} catch (InterruptedException ex) {
Logger.getLogger(GuardianMemberImpl.class.getName()).log(Level.SEVERE, null, ex);
}
}
exceptionThrown = false;
System.out.println(getParticipantIdentifier() + ": I am not blocked!");
GlobalException exc;
if ((exc = exceptionQueue.peek()) == null) {
System.out.println(getParticipantIdentifier() + "#No exception on exception queue");
return;
}
//Check if ex.targetContext() matches the participant id
//Eg. ex.targetContext(): Main and participant id: Init.Main.Backup -> should thrown the exception
//Test if the exception should be thrown in the target context
for (Context c : contextList) {
if (exc.getTargetContext().equals(c) && (c.equals(Context.INIT_CONTEXT) || c.getExceptionList().contains(exc.getClass()))) {
System.out.println(getParticipantIdentifier() + "#Returning an exception");
exceptionQueue.poll();
throw exc;
}
}
return;
}
public String getParticipantIdentifier() {
//1) Return the participant identifier -> context list dot separated
StringBuffer participantIdentifier = new StringBuffer();
participantIdentifier.append(this.id);
for (int i = 0; i < contextList.size(); i++) {
participantIdentifier.append("." + contextList.get(i).getName());
}
return participantIdentifier.toString();
}
public void setUniqueParticipantID(int id) {
this.id = id;
}
public int getParticipantState() {
return participantState;
}
public void setParticipantState(int state) {
this.participantState = state;
}
}
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