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* Quasar: lightweight threads and actors for the JVM.
* Copyright (c) 2013-2014, Parallel Universe Software Co. All rights reserved.
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
* or (per the licensee's choosing)
* under the terms of the GNU Lesser General Public License version 3.0
* as published by the Free Software Foundation.
package co.paralleluniverse.actors;
import co.paralleluniverse.fibers.SuspendExecution;
* An interface that is used by {@link BasicActor#receive(co.paralleluniverse.actors.MessageProcessor) BasicActor.receive} for selective receive.
* @author pron
public interface MessageProcessor<Message, T> {
* An implementation of this method is used to select messages off an actor's queue for the purpose of selective receive. If the message
* is selected (i.e. it should be processed now), then this method should return a non-null value. If the message
* is to be skipped, this method should return {@code null}. The value returned by this method, will be returned by the {@code receive} method
* this instance has been passed to.
* <p/>
* If the message is selected, this method may process it (and may even call {@code receive} for nested selective receives),
* or it may choose to return the message and have it processed when it is returned from the enclosing {@link BasicActor#receive(co.paralleluniverse.actors.MessageProcessor) receive}.
* @param m The message
* @return A non-null value if the message is selected; {@code null} if the message is to be skipped.
* @throws SuspendExecution
* @throws InterruptedException
T process(Message m) throws SuspendExecution, InterruptedException;