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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.cluster.service;

import org.elasticsearch.Version;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Streamable;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;

import java.io.IOException;

/**
 */
public class PendingClusterTask implements Streamable {

    private long insertOrder;
    private Priority priority;
    private Text source;
    private long timeInQueue;
    private boolean executing;

    public PendingClusterTask() {
    }

    public PendingClusterTask(long insertOrder, Priority priority, Text source, long timeInQueue, boolean executing) {
        assert timeInQueue >= 0 : "got a negative timeInQueue [" + timeInQueue + "]";
        assert insertOrder >= 0 : "got a negative insertOrder [" + insertOrder + "]";
        this.insertOrder = insertOrder;
        this.priority = priority;
        this.source = source;
        this.timeInQueue = timeInQueue;
        this.executing = executing;
    }

    public long getInsertOrder() {
        return insertOrder;
    }

    public Priority getPriority() {
        return priority;
    }

    public Text getSource() {
        return source;
    }

    public long getTimeInQueueInMillis() {
        return timeInQueue;
    }

    public TimeValue getTimeInQueue() {
        return new TimeValue(getTimeInQueueInMillis());
    }

    public boolean isExecuting() {
        return executing;
    }

    @Override
    public void readFrom(StreamInput in) throws IOException {
        insertOrder = in.readVLong();
        priority = Priority.readFrom(in);
        source = in.readText();
        if (in.getVersion().onOrAfter(Version.V_1_4_0)) {
            timeInQueue = in.readLong();
        } else {
            timeInQueue = in.readVLong();
        }
        if (in.getVersion().onOrAfter(Version.V_1_3_0)) {
            executing = in.readBoolean();
        }
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        out.writeVLong(insertOrder);
        Priority.writeTo(priority, out);
        out.writeText(source);
        if (out.getVersion().onOrAfter(Version.V_1_4_0)) {
            out.writeLong(timeInQueue);
        } else {
            out.writeVLong(timeInQueue);
        }
        if (out.getVersion().onOrAfter(Version.V_1_3_0)) {
            out.writeBoolean(executing);
        }
    }
}