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/*
 * 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.github.dm.jrt.channel;

import org.jetbrains.annotations.Nullable;

/**
 * Interface defining an output consumer that can be bound to an output channel.

 * The same instance can be safely bound to different output channels.
 * 
 * The typical lifecycle of a consumer object is the following:
 * 
 *     
 *
 *                           --------
 *                     |    |        |
 *                     V    V        |
 *               ----------------    |
 *               |  onOutput()  |----
 *               ----------------
 *                     |    |
 *                     |    |
 *               ------      ------
 *       |      |                  |      |
 *       V      V                  V      V
 *   ----------------          ----------------
 *   | onComplete() |          |  onError()   |
 *   ----------------          ----------------
 *     
 * 
 * 
 * Created by davide-maestroni on 09/07/2014.
 *
 * @param  the output data type.
 */
public interface OutputConsumer {

    /**
     * Called when the channel closes after the invocation completes its execution.
     */
    void onComplete();

    /**
     * Called when the bounded channel transfer is aborted.
     *
     * @param error the reason of the abortion.
     */
    void onError(@Nullable RoutineException error);

    /**
     * Called when an output is passed to the channel.
     *
     * @param output the output.
     */
    void onOutput(OUT output);
}