/*
 * 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.durableexecutor.impl.operations;

import com.hazelcast.core.HazelcastException;
import com.hazelcast.durableexecutor.impl.DurableExecutorContainer;
import com.hazelcast.durableexecutor.impl.DurableExecutorDataSerializerHook;
import com.hazelcast.nio.Bits;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.spi.BlockingOperation;
import com.hazelcast.spi.WaitNotifyKey;

import java.io.IOException;

/**
 * Used to retrieve the response of an execution with the given sequence
 */
public class RetrieveResultOperation extends AbstractDurableExecutorOperation implements BlockingOperation {

    private int sequence;

    private transient Object result;

    public RetrieveResultOperation() {
    }

    public RetrieveResultOperation(String name, int sequence) {
        super(name);
        this.sequence = sequence;
    }

    @Override
    public void run() throws Exception {
        DurableExecutorContainer executorContainer = getExecutorContainer();
        result = executorContainer.retrieveResult(sequence);
    }

    @Override
    public Object getResponse() {
        return result;
    }

    @Override
    public WaitNotifyKey getWaitKey() {
        long uniqueId = Bits.combineToLong(getPartitionId(), sequence);
        return new DurableExecutorWaitNotifyKey(name, uniqueId);
    }

    @Override
    public boolean shouldWait() {
        DurableExecutorContainer executorContainer = getExecutorContainer();
        return executorContainer.shouldWait(sequence);
    }

    @Override
    public void onWaitExpire() {
        sendResponse(new HazelcastException());
    }

    @Override
    protected void writeInternal(ObjectDataOutput out) throws IOException {
        super.writeInternal(out);
        out.writeInt(sequence);
    }

    @Override
    protected void readInternal(ObjectDataInput in) throws IOException {
        super.readInternal(in);
        sequence = in.readInt();
    }

    @Override
    public int getId() {
        return DurableExecutorDataSerializerHook.RETRIEVE_RESULT;
    }
}