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The Service Provider Interfaces for developing HiveMQ plugins.

There is a newer version: 3.4.4

/*
 * Copyright 2014 dc-square GmbH
 *
 * 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.hivemq.spi.callback;

/**
 * A callback which execution is synchronized. That means the callbacks
 * are executed in order of their priority.
 * 
 * Don't implement this interface on your own, use a more concrete interface when you want
 * to add a callback
 *
 * @author Christian Goetz
 * @since 1.4
 */
public interface SynchronousCallback extends Callback {

    /**
     * @return a numerical priority. Lower numbers mean higher priority
     */
    int priority();
}