/*
 * Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 com.hazelcast.client.impl.protocol.task.mapreduce;

import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.MapReduceCancelCodec;
import com.hazelcast.client.impl.protocol.task.AbstractCallableMessageTask;
import com.hazelcast.instance.Node;
import com.hazelcast.mapreduce.impl.MapReduceService;
import com.hazelcast.mapreduce.impl.task.JobSupervisor;
import com.hazelcast.nio.Address;
import com.hazelcast.nio.Connection;

import java.security.Permission;
import java.util.concurrent.CancellationException;

public class MapReduceCancelMessageTask
        extends AbstractCallableMessageTask<MapReduceCancelCodec.RequestParameters> {

    public MapReduceCancelMessageTask(ClientMessage clientMessage, Node node, Connection connection) {
        super(clientMessage, node, connection);
    }

    @Override
    protected Object call()
            throws Exception {

        MapReduceService mapReduceService = getService(MapReduceService.SERVICE_NAME);
        Address jobOwner = mapReduceService.getLocalAddress();
        mapReduceService.registerJobSupervisorCancellation(parameters.name, parameters.jobId, jobOwner);

        JobSupervisor supervisor = mapReduceService.getJobSupervisor(parameters.name, parameters.jobId);
        if (supervisor != null && supervisor.isOwnerNode()) {
            Exception exception = new CancellationException("Operation was cancelled by the user");
            supervisor.cancelAndNotify(exception);
        }
        return true;
    }

    @Override
    protected MapReduceCancelCodec.RequestParameters decodeClientMessage(ClientMessage clientMessage) {
        return MapReduceCancelCodec.decodeRequest(clientMessage);
    }

    @Override
    protected ClientMessage encodeResponse(Object response) {
        return MapReduceCancelCodec.encodeResponse((Boolean) response);
    }

    @Override
    public String getServiceName() {
        return MapReduceService.SERVICE_NAME;
    }

    @Override
    public Permission getRequiredPermission() {
        return null;
    }

    @Override
    public String getDistributedObjectName() {
        return parameters.name;
    }

    @Override
    public String getMethodName() {
        return null;
    }

    @Override
    public Object[] getParameters() {
        return null;
    }
}