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BitTorrent Client Library (Core)

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/*
 * Copyright (c) 2016—2017 Andrei Tomashpolskiy and individual contributors.
 *
 * 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 bt.torrent.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Annotates messaging agents, that act as message consumers.
 *
 * Both the annotated method and the containing class must be public and have one of the following lists of parameters:
 * 
 * (T message, {@link bt.torrent.messaging.MessageContext} context)
 * (T message)
 * 
 * where T is a (subtype of) {@link bt.protocol.Message}.
 *
 * For instance, consumer of {@link bt.protocol.Piece} messages may have one of two forms:
 * 
 * {@code public void consume(Piece piece, MessageContext context)}
 * {@code public void consume(Piece piece)}
 * 
 *
 * A generic consumer, that is interested in receiving all types of messages:
 * 
 * {@code public void consume(Message message, MessageContext context)}
 * {@code public void consume(Message message)}
 * 
 *
 * @see bt.torrent.messaging.MessageConsumer
 * @since 1.0
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Consumes {}