/*
 * 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.action.search;

/**
 * Base implementation for an async action.
 */
abstract class AbstractAsyncAction {

    private final long startTime;

    protected AbstractAsyncAction() { this(System.currentTimeMillis());}

    protected AbstractAsyncAction(long startTime) {
        this.startTime = startTime;
    }

    /**
     * Return the time when the action started.
     */
    protected final long startTime() {
        return startTime;
    }

    /**
     * Builds how long it took to execute the search.
     */
    protected final long buildTookInMillis() {
        // protect ourselves against time going backwards
        // negative values don't make sense and we want to be able to serialize that thing as a vLong
        return Math.max(1, System.currentTimeMillis() - startTime);
    }

    abstract void start();
}
