co.paralleluniverse.strands.dataflow

Class ValChannel<V>

java.lang.Object

co.paralleluniverse.strands.dataflow.ValChannel<V>

All Implemented Interfaces:

Port<V>, PortAutoCloseable, ReceivePort<V>, Selectable<V>, java.lang.AutoCloseable

public class ValChannel<V>
extends java.lang.Object
implements ReceivePort<V>, Selectable<V>

An adapter that turns a DelayedVal into a ReceivePort that receives the DelayedVal's value and then closes.

Nested Class Summary

Nested classes/interfaces inherited from interface co.paralleluniverse.strands.channels.ReceivePort

ReceivePort.EOFException

Constructor Summary

Constructors

Constructor and Description
ValChannel(Val<V> val)

Method Summary

Modifier and Type	Method and Description
void	close() Closes the channel so that no more messages could be sent to it.
boolean	isClosed() Tests whether the channel has been closed and no more messages await in the channel.
V	receive() Retrieves a message from the channels, possibly blocking until one becomes available.
V	receive(long timeout, java.util.concurrent.TimeUnit unit) Retrieves a message from the channels, possibly blocking until one becomes available, but no longer than the specified timeout.
V	receive(Timeout timeout) Retrieves a message from the channels, possibly blocking until one becomes available, but no longer than the specified timeout.
java.lang.Object	register(SelectAction<V> action1)
boolean	tryNow(java.lang.Object token)
V	tryReceive() Retrieves a message from the channel if one is available.
void	unregister(java.lang.Object token)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ValChannel

public ValChannel(Val<V> val)

Method Detail

receive

public V receive()
          throws SuspendExecution,
                 java.lang.InterruptedException

Description copied from interface: ReceivePort

Retrieves a message from the channels, possibly blocking until one becomes available.

Specified by:

receive in interface ReceivePort<V>

Returns:

a message, or null if the channel has been closed and no more messages await (see PortAutoCloseable.isClosed()).

Throws:

java.lang.InterruptedException

SuspendExecution

tryReceive

public V tryReceive()

Description copied from interface: ReceivePort

Retrieves a message from the channel if one is available. This method never blocks.

Specified by:

tryReceive in interface ReceivePort<V>

Returns:

a message, or null if one is not immediately available.

receive

public V receive(long timeout,
                 java.util.concurrent.TimeUnit unit)
          throws SuspendExecution,
                 java.lang.InterruptedException

Description copied from interface: ReceivePort

Retrieves a message from the channels, possibly blocking until one becomes available, but no longer than the specified timeout.

Specified by:

receive in interface ReceivePort<V>

Parameters:

timeout - the maximum duration to block waiting for a message.

unit - the time unit of the timeout.

Returns:

a message, or null if the channel has been closed and no more messages await (see PortAutoCloseable.isClosed()), or if the timeout has expired.

Throws:

java.lang.InterruptedException

SuspendExecution

receive

public V receive(Timeout timeout)
          throws SuspendExecution,
                 java.lang.InterruptedException

Description copied from interface: ReceivePort

Retrieves a message from the channels, possibly blocking until one becomes available, but no longer than the specified timeout.

Specified by:

receive in interface ReceivePort<V>

Parameters:

timeout - the method will not block for longer than the amount remaining in the Timeout

Returns:

a message, or null if the channel has been closed and no more messages await (see PortAutoCloseable.isClosed()), or if the timeout has expired.

Throws:

java.lang.InterruptedException

SuspendExecution

close

public void close()

Description copied from interface: PortAutoCloseable

Closes the channel so that no more messages could be sent to it. Messages already sent to the channel will still be received.

Specified by:

close in interface PortAutoCloseable

Specified by:

close in interface java.lang.AutoCloseable

isClosed

public boolean isClosed()

Description copied from interface: PortAutoCloseable

Tests whether the channel has been closed and no more messages await in the channel. If this method returns true all future calls to receive are guaranteed to return null, and calls to receive on a primitive channel will throw a EOFException.

Specified by:

isClosed in interface PortAutoCloseable

Returns:

true if the channels has been closed and no more messages will be received; false otherwise.

register

public java.lang.Object register(SelectAction<V> action1)

Specified by:

register in interface Selectable<V>

tryNow

public boolean tryNow(java.lang.Object token)

Specified by:

tryNow in interface Selectable<V>

unregister

public void unregister(java.lang.Object token)

Specified by:

unregister in interface Selectable<V>