co.paralleluniverse.strands.channels.DoubleReceivePort Maven / Gradle / Ivy
/*
* 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.strands.channels;
import co.paralleluniverse.fibers.SuspendExecution;
import co.paralleluniverse.strands.Timeout;
import co.paralleluniverse.strands.channels.ReceivePort.EOFException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* A primitive {@code double} channel's consumer-side interface.
*
* All methods of this interface must only be called by the channel's owner.
*
* @author pron
*/
public interface DoubleReceivePort extends ReceivePort {
/**
* Retrieves a message from the channels, possibly blocking until one becomes available.
* If the channel has been closed and no more messages await, this method throws an {@link EOFException}.
*
* @return a message.
* @throws ReceivePort.EOFException if the channel has been closed and no more messages await
* @throws InterruptedException
*/
double receiveDouble() throws SuspendExecution, InterruptedException, EOFException;
/**
* Retrieves a message from the channels, possibly blocking until one becomes available, but no longer than the specified timeout.
* If the channel has been closed and no more messages await, this method throws an {@link EOFException}.
*
* @param timeout the maximum duration to block waiting for a message.
* @param unit the time unit of the timeout.
* @return a message. (see {@link #isClosed()}), or if the timeout has expired.
* @throws TimeoutException if the timeout has expired
* @throws ReceivePort.EOFException if the channel has been closed and no more messages await
* @throws InterruptedException
*/
double receiveDouble(long timeout, TimeUnit unit) throws SuspendExecution, InterruptedException, TimeoutException, EOFException;
/**
* Retrieves a message from the channels, possibly blocking until one becomes available, but no longer than the specified timeout.
* If the channel has been closed and no more messages await, this method throws an {@link EOFException}.
*
* @param timeout the method will not block for longer than the amount remaining in the {@link Timeout}
* @return a message. (see {@link #isClosed()}), or if the timeout has expired.
* @throws TimeoutException if the timeout has expired
* @throws ReceivePort.EOFException if the channel has been closed and no more messages await
* @throws InterruptedException
*/
double receiveDouble(Timeout timeout) throws SuspendExecution, InterruptedException, TimeoutException, EOFException;
/**
* Tests whether a value is pending in the channel. If it is, the next call to {@code receiveDouble} is guaranteed not to block.
*
* @return {@code true} if a value is waiting in the channel; {@code false} otherwise.
*/
boolean hasMessage();
}