/*
 * 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.scheduledexecutor.impl.operations;

import com.hazelcast.core.HazelcastException;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.scheduledexecutor.ScheduledTaskHandler;
import com.hazelcast.scheduledexecutor.impl.ScheduledExecutorDataSerializerHook;
import com.hazelcast.scheduledexecutor.impl.ScheduledExecutorWaitNotifyKey;
import com.hazelcast.spi.BlockingOperation;
import com.hazelcast.spi.WaitNotifyKey;

import java.io.IOException;
import java.util.concurrent.ExecutionException;

import static com.hazelcast.util.ExceptionUtil.sneakyThrow;

public class GetResultOperation<V>
        extends AbstractSchedulerOperation implements BlockingOperation {

    private String taskName;

    private ScheduledTaskHandler handler;

    private Object result;

    public GetResultOperation() {
    }

    public GetResultOperation(ScheduledTaskHandler handler) {
        super(handler.getSchedulerName());
        this.taskName = handler.getTaskName();
        this.handler = handler;
    }

    @Override
    public void run()
            throws Exception {
        result = getContainer().get(taskName);
    }

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

    @Override
    public WaitNotifyKey getWaitKey() {
        return new ScheduledExecutorWaitNotifyKey(getSchedulerName(), handler.toUrn());
    }

    @Override
    public boolean shouldWait() {
        try {
            return getContainer().shouldParkGetResult(taskName);
        } catch (ExecutionException e) {
            sneakyThrow(e);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }

        return false;
    }

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

    @Override
    public int getId() {
        return ScheduledExecutorDataSerializerHook.GET_RESULT;
    }

    @Override
    protected void writeInternal(ObjectDataOutput out)
            throws IOException {
        super.writeInternal(out);
        out.writeUTF(taskName);
        out.writeUTF(handler.toUrn());
    }

    @Override
    protected void readInternal(ObjectDataInput in)
            throws IOException {
        super.readInternal(in);
        this.taskName = in.readUTF();
        this.handler = ScheduledTaskHandler.of(in.readUTF());
    }
}