/*
 * 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.policy.guardianExceptionHandling;

import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.sca.implementation.guardian.GuardianMember;
import org.apache.tuscany.sca.invocation.Message;

public class GuardianMemberFactoryImpl {

    Map<String, GuardianMember> guardianMembers;
    private static GuardianMemberFactoryImpl instance = null;

    public static GuardianMemberFactoryImpl getInstance() {
        if (instance == null) {
            instance = new GuardianMemberFactoryImpl();
        }
        return instance;
    }

    protected GuardianMemberFactoryImpl() {
        guardianMembers = new HashMap<String, GuardianMember>();
    }

    public GuardianMember createGuardianMember(String componentName, Message msg, GuardianExceptionHandlingPolicyInterceptor interceptor) {
        GuardianMemberImpl gm = (GuardianMemberImpl) guardianMembers.get(componentName);

        if (gm == null) {
            gm = new GuardianMemberImpl(componentName, msg, interceptor);
            guardianMembers.put(componentName, gm);

            //Inform the Guardian Group of the new Guardian Member
            Object msgBody = msg.getBody();

            msg.setBody(gm);
            interceptor.invokeGuardianGroupOperation("addGuardianMember", msg);

            msg.setBody(msgBody);
        }

        gm.setMessage(msg);
        gm.setGuardianExceptionHandlingPolicyInterceptor(interceptor);

        return gm;
    }

    public GuardianMember removeGuardianMember(String componentName, Message msg, GuardianExceptionHandlingPolicyInterceptor interceptor) {

        GuardianMember gm = guardianMembers.remove(componentName);

        if (gm != null) {

            Object msgBody = msg.getBody();

            msg.setBody(gm);
            interceptor.invokeGuardianGroupOperation("removeGuardianMember", msg);

            msg.setBody(msgBody);
        }

        return gm;
    }
}