/*
 * 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.common.util.concurrent;

import org.elasticsearch.common.Priority;

import java.util.concurrent.Callable;

/**
 *
 */
public abstract class PrioritizedCallable<T> implements Callable<T>, Comparable<PrioritizedCallable> {

    private final Priority priority;

    public static <T> PrioritizedCallable<T> wrap(Callable<T> callable, Priority priority) {
        return new Wrapped<T>(callable, priority);
    }

    protected PrioritizedCallable(Priority priority) {
        this.priority = priority;
    }

    @Override
    public int compareTo(PrioritizedCallable pc) {
        return priority.compareTo(pc.priority);
    }

    public Priority priority() {
        return priority;
    }

    static class Wrapped<T> extends PrioritizedCallable<T> {

        private final Callable<T> callable;

        private Wrapped(Callable<T> callable, Priority priority) {
            super(priority);
            this.callable = callable;
        }

        @Override
        public T call() throws Exception {
            return callable.call();
        }
    }
}