/*
 * 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.executor.impl;

import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.HazelcastInstanceAware;
import com.hazelcast.core.PartitionAware;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;

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

/**
 * An adapter that adapts a {@link Runnable} to become a {@link Callable}.
 *
 * @param <V>
 */
public final class RunnableAdapter<V> implements IdentifiedDataSerializable, Callable<V>,
        HazelcastInstanceAware, PartitionAware {

    private Runnable task;

    public RunnableAdapter() {
    }

    public RunnableAdapter(Runnable task) {
        this.task = task;
    }

    public Runnable getRunnable() {
        return task;
    }

    public void setRunnable(Runnable runnable) {
        task = runnable;
    }

    @Override
    public V call() throws Exception {
        task.run();
        return null;
    }

    @Override
    public Object getPartitionKey() {
        if (task instanceof PartitionAware) {
            return ((PartitionAware) task).getPartitionKey();
        }
        return null;
    }

    @Override
    public void setHazelcastInstance(HazelcastInstance hazelcastInstance) {
        if (task instanceof HazelcastInstanceAware) {
            HazelcastInstanceAware instanceAwareTask = (HazelcastInstanceAware) task;
            instanceAwareTask.setHazelcastInstance(hazelcastInstance);
        }
    }

    @Override
    public void writeData(ObjectDataOutput out) throws IOException {
        out.writeObject(task);
    }

    @Override
    public void readData(ObjectDataInput in) throws IOException {
        task = in.readObject();
    }

    @Override
    public int getFactoryId() {
        return ExecutorDataSerializerHook.F_ID;
    }

    @Override
    public int getId() {
        return ExecutorDataSerializerHook.RUNNABLE_ADAPTER;
    }

    @Override
    public String toString() {
        return "RunnableAdapter" + "{task=" + task + '}';
    }
}