org.xnio.channels

Class AssembledMessageChannel

java.lang.Object

org.xnio.channels.AssembledMessageChannel

All Implemented Interfaces:

Closeable, AutoCloseable, Channel, InterruptibleChannel, CloseableChannel, Configurable, MessageChannel, ReadableMessageChannel, SuspendableChannel, SuspendableReadChannel, SuspendableWriteChannel, WritableMessageChannel

Direct Known Subclasses:

AssembledConnectedMessageChannel

public class AssembledMessageChannel
extends Object
implements MessageChannel

A bidirectional message channel assembled from a readable and writable message channel.

Author:

David M. Lloyd

Field Summary

Fields inherited from interface org.xnio.channels.Configurable

EMPTY

Constructor Summary

Constructors

Constructor and Description
AssembledMessageChannel(CloseableChannel closeable, ReadableMessageChannel readable, WritableMessageChannel writable) Construct a new instance.
AssembledMessageChannel(ReadableMessageChannel readable, WritableMessageChannel writable) Construct a new instance.

Method Summary

Modifier and Type	Method and Description
void	awaitReadable() Block until this channel becomes readable again.
void	awaitReadable(long time, TimeUnit timeUnit) Block until this channel becomes readable again, or until the timeout expires.
void	awaitWritable() Block until this channel becomes writable again.
void	awaitWritable(long time, TimeUnit timeUnit) Block until this channel becomes writable again, or until the timeout expires.
void	close() Close this channel.
boolean	flush() Flush any waiting partial send or write.
ChannelListener.Setter<? extends AssembledMessageChannel>	getCloseSetter() Get the setter which can be used to change the close listener for this channel.
XnioIoThread	getIoThread() Get the I/O thread associated with this channel.
<T> T	getOption(Option<T> option) Get the value of a channel option.
ChannelListener.Setter<? extends AssembledMessageChannel>	getReadSetter() Get the setter which can be used to change the read listener for this channel.
XnioExecutor	getReadThread() Deprecated.
XnioWorker	getWorker() Get the worker for this channel.
ChannelListener.Setter<? extends AssembledMessageChannel>	getWriteSetter() Get the setter which can be used to change the write listener for this channel.
XnioExecutor	getWriteThread() Deprecated.
boolean	isOpen() Determine whether this channel is open.
boolean	isReadResumed() Determine whether reads are resumed.
boolean	isWriteResumed() Determine whether writes are resumed.
int	receive(ByteBuffer buffer) Receive a message.
long	receive(ByteBuffer[] buffers) Receive a message.
long	receive(ByteBuffer[] buffers, int offs, int len) Receive a message.
void	resumeReads() Resume reads on this channel.
void	resumeWrites() Resume writes on this channel.
boolean	send(ByteBuffer buffer) Send a complete message.
boolean	send(ByteBuffer[] buffers) Send a complete message.
boolean	send(ByteBuffer[] buffers, int offs, int len) Send a complete message.
boolean	sendFinal(ByteBuffer buffer) Send a complete message.
boolean	sendFinal(ByteBuffer[] buffers) Send a complete message.
boolean	sendFinal(ByteBuffer[] buffers, int offs, int len) Send a complete message.
<T> T	setOption(Option<T> option, T value) Set an option for this channel.
void	shutdownReads() Places this readable channel at "end of stream".
void	shutdownWrites() Indicate that writing is complete for this channel.
boolean	supportsOption(Option<?> option) Determine whether an option is supported on this channel.
void	suspendReads() Suspend further read notifications on this channel.
void	suspendWrites() Suspend further write notifications on this channel.
void	wakeupReads() Resume reads on this channel, and force the read listener to be triggered even if the channel isn't actually readable.
void	wakeupWrites() Resume writes on this channel, and force the write listener to be triggered even if the channel isn't actually writable.

Methods inherited from class java.lang.Object

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

Constructor Detail

AssembledMessageChannel

public AssembledMessageChannel(CloseableChannel closeable,
                               ReadableMessageChannel readable,
                               WritableMessageChannel writable)

Construct a new instance.

Parameters:

closeable - the single central closeable channel

readable - the read channel

writable - the write channel

AssembledMessageChannel

public AssembledMessageChannel(ReadableMessageChannel readable,
                               WritableMessageChannel writable)

Construct a new instance.

Parameters:

readable - the read channel

writable - the write channel

Method Detail

getIoThread

public XnioIoThread getIoThread()

Description copied from interface: CloseableChannel

Get the I/O thread associated with this channel.

Specified by:

getIoThread in interface CloseableChannel

Returns:

the I/O thread associated with this channel

getReadSetter

public ChannelListener.Setter<? extends AssembledMessageChannel> getReadSetter()

Description copied from interface: MessageChannel

Get the setter which can be used to change the read listener for this channel.

Specified by:

getReadSetter in interface MessageChannel

Specified by:

getReadSetter in interface ReadableMessageChannel

Specified by:

getReadSetter in interface SuspendableChannel

Specified by:

getReadSetter in interface SuspendableReadChannel

Returns:

the setter

suspendReads

public void suspendReads()

Description copied from interface: SuspendableReadChannel

Suspend further read notifications on this channel.

Specified by:

suspendReads in interface SuspendableReadChannel

resumeReads

public void resumeReads()

Description copied from interface: SuspendableReadChannel

Resume reads on this channel. The read listener will be called as soon as there is data available to be read.

Specified by:

resumeReads in interface SuspendableReadChannel

isReadResumed

public boolean isReadResumed()

Description copied from interface: SuspendableReadChannel

Determine whether reads are resumed.

Specified by:

isReadResumed in interface SuspendableReadChannel

Returns:

true if reads are resumed, false if reads are suspended

wakeupReads

public void wakeupReads()

Description copied from interface: SuspendableReadChannel

Resume reads on this channel, and force the read listener to be triggered even if the channel isn't actually readable.

Specified by:

wakeupReads in interface SuspendableReadChannel

shutdownReads

public void shutdownReads()
                   throws IOException

Description copied from interface: SuspendableReadChannel

Places this readable channel at "end of stream". Further reads will result in EOF. Shutting down all directions of a channel will cause CloseableChannel.close() to be called automatically.

Specified by:

shutdownReads in interface SuspendableReadChannel

Throws:

IOException - if an I/O error occurs

awaitReadable

public void awaitReadable()
                   throws IOException

Description copied from interface: SuspendableReadChannel

Block until this channel becomes readable again. This method may return spuriously before the channel becomes readable.

Specified by:

awaitReadable in interface SuspendableReadChannel

Throws:

InterruptedIOException - if the operation is interrupted; the thread's interrupt flag will be set as well

IOException - if an I/O error occurs

awaitReadable

public void awaitReadable(long time,
                          TimeUnit timeUnit)
                   throws IOException

Description copied from interface: SuspendableReadChannel

Block until this channel becomes readable again, or until the timeout expires. This method may return spuriously before the channel becomes readable or the timeout expires.

Specified by:

awaitReadable in interface SuspendableReadChannel

Parameters:

time - the time to wait

timeUnit - the time unit

Throws:

InterruptedIOException - if the operation is interrupted; the thread's interrupt flag will be set as well

IOException - if an I/O error occurs

getReadThread

@Deprecated
public XnioExecutor getReadThread()

Deprecated.

Description copied from interface: SuspendableReadChannel

Get the read thread for this channel.

Specified by:

getReadThread in interface SuspendableReadChannel

Returns:

the thread, or null if none is configured or available

receive

public int receive(ByteBuffer buffer)
            throws IOException

Description copied from interface: ReadableMessageChannel

Receive a message.

Specified by:

receive in interface ReadableMessageChannel

Parameters:

buffer - the buffer that will hold the message

Returns:

the size of the received message, 0 if no message is available, and -1 if the message channel has reached an end-of-file condition

Throws:

IOException - if an I/O error occurs

receive

public long receive(ByteBuffer[] buffers)
             throws IOException

Description copied from interface: ReadableMessageChannel

Receive a message.

Specified by:

receive in interface ReadableMessageChannel

Parameters:

buffers - the buffers that will hold the message

Returns:

the size of the received message, 0 if no message is available, and -1 if the message channel has reached an end-of-file condition

Throws:

IOException - if an I/O error occurs

receive

public long receive(ByteBuffer[] buffers,
                    int offs,
                    int len)
             throws IOException

Description copied from interface: ReadableMessageChannel

Receive a message.

Specified by:

receive in interface ReadableMessageChannel

Parameters:

buffers - the buffers that will hold the message

offs - the offset into the array of buffers of the first buffer to read into

len - the number of buffers to fill

Returns:

the size of the received message, 0 if no message is available, and -1 if the message channel has reached an end-of-file condition

Throws:

IOException - if an I/O error occurs

getWriteSetter

public ChannelListener.Setter<? extends AssembledMessageChannel> getWriteSetter()

Description copied from interface: MessageChannel

Get the setter which can be used to change the write listener for this channel.

Specified by:

getWriteSetter in interface MessageChannel

Specified by:

getWriteSetter in interface SuspendableChannel

Specified by:

getWriteSetter in interface SuspendableWriteChannel

Specified by:

getWriteSetter in interface WritableMessageChannel

Returns:

the setter

suspendWrites

public void suspendWrites()

Description copied from interface: SuspendableWriteChannel

Suspend further write notifications on this channel.

Specified by:

suspendWrites in interface SuspendableWriteChannel

resumeWrites

public void resumeWrites()

Description copied from interface: SuspendableWriteChannel

Resume writes on this channel. The write listener will be called as soon as the channel becomes writable.

Specified by:

resumeWrites in interface SuspendableWriteChannel

isWriteResumed

public boolean isWriteResumed()

Description copied from interface: SuspendableWriteChannel

Determine whether writes are resumed.

Specified by:

isWriteResumed in interface SuspendableWriteChannel

Returns:

true if writes are resumed, false if writes are suspended

wakeupWrites

public void wakeupWrites()

Description copied from interface: SuspendableWriteChannel

Resume writes on this channel, and force the write listener to be triggered even if the channel isn't actually writable.

Specified by:

wakeupWrites in interface SuspendableWriteChannel

shutdownWrites

public void shutdownWrites()
                    throws IOException

Description copied from interface: SuspendableWriteChannel

Indicate that writing is complete for this channel. Further attempts to write data to this channel after this method is invoked will result in an exception. If this method was already called, calling this method again will have no additional effect. After this method is called, any remaining data still must be flushed out via the SuspendableWriteChannel.flush() method; once this is done, if the read side of the channel was shut down, the channel will automatically close.

Specified by:

shutdownWrites in interface SuspendableWriteChannel

Throws:

IOException - if an I/O error occurs

awaitWritable

public void awaitWritable()
                   throws IOException

Description copied from interface: SuspendableWriteChannel

Block until this channel becomes writable again. This method may return spuriously before the channel becomes writable.

Specified by:

awaitWritable in interface SuspendableWriteChannel

Throws:

InterruptedIOException - if the operation is interrupted; the thread's interrupt flag will be set as well

IOException - if an I/O error occurs

awaitWritable

public void awaitWritable(long time,
                          TimeUnit timeUnit)
                   throws IOException

Description copied from interface: SuspendableWriteChannel

Block until this channel becomes writable again, or until the timeout expires. This method may return spuriously before the channel becomes writable or the timeout expires.

Specified by:

awaitWritable in interface SuspendableWriteChannel

Parameters:

time - the time to wait

timeUnit - the time unit

Throws:

InterruptedIOException - if the operation is interrupted; the thread's interrupt flag will be set as well

IOException - if an I/O error occurs

getWriteThread

@Deprecated
public XnioExecutor getWriteThread()

Deprecated.

Description copied from interface: SuspendableWriteChannel

Get the write thread for this channel.

Specified by:

getWriteThread in interface SuspendableWriteChannel

Returns:

the thread, or null if none is configured or available

send

public boolean send(ByteBuffer buffer)
             throws IOException

Description copied from interface: WritableMessageChannel

Send a complete message.

Specified by:

send in interface WritableMessageChannel

Parameters:

buffer - the message to send

Returns:

the result of the send operation; true if the message was sent, or false if it would block

Throws:

IOException - if an I/O error occurs

send

public boolean send(ByteBuffer[] buffers)
             throws IOException

Description copied from interface: WritableMessageChannel

Send a complete message.

Specified by:

send in interface WritableMessageChannel

Parameters:

buffers - the buffers holding the message to send

Returns:

the result of the send operation; true if the message was sent, or false if it would block

Throws:

IOException - if an I/O error occurs

send

public boolean send(ByteBuffer[] buffers,
                    int offs,
                    int len)
             throws IOException

Description copied from interface: WritableMessageChannel

Send a complete message.

Specified by:

send in interface WritableMessageChannel

Parameters:

buffers - the buffers holding the message to send

offs - the offset into the buffer array of the first buffer

len - the number of buffers that contain data to send

Returns:

the result of the send operation; true if the message was sent, or false if it would block

Throws:

IOException - if an I/O error occurs

sendFinal

public boolean sendFinal(ByteBuffer buffer)
                  throws IOException

Description copied from interface: WritableMessageChannel

Send a complete message. If the message was successfully sent the channel with have its writes shutdown.

Specified by:

sendFinal in interface WritableMessageChannel

Parameters:

buffer - the message to send

Returns:

the result of the send operation; true if the message was sent, or false if it would block

Throws:

IOException - if an I/O error occurs

sendFinal

public boolean sendFinal(ByteBuffer[] buffers)
                  throws IOException

Description copied from interface: WritableMessageChannel

Send a complete message. If the message was successfully sent the channel with have its writes shutdown.

Specified by:

sendFinal in interface WritableMessageChannel

Parameters:

buffers - the buffers holding the message to send

Returns:

the result of the send operation; true if the message was sent, or false if it would block

Throws:

IOException - if an I/O error occurs

sendFinal

public boolean sendFinal(ByteBuffer[] buffers,
                         int offs,
                         int len)
                  throws IOException

Description copied from interface: WritableMessageChannel

Send a complete message. If the message was successfully sent the channel with have its writes shutdown.

Specified by:

sendFinal in interface WritableMessageChannel

Parameters:

buffers - the buffers holding the message to send

offs - the offset into the buffer array of the first buffer

len - the number of buffers that contain data to send

Returns:

the result of the send operation; true if the message was sent, or false if it would block

Throws:

IOException - if an I/O error occurs

flush

public boolean flush()
              throws IOException

Description copied from interface: SuspendableWriteChannel

Flush any waiting partial send or write. If there is no data to flush, or if the flush completed successfully, this method will return true. If there is data to flush which cannot be immediately written, this method will return false. If this method returns true after SuspendableWriteChannel.shutdownWrites() was called on this channel, the write listener will no longer be invoked on this channel. If this is case and additionally this is a write-only channel or the read side was previously shut down, then the channel will automatically be closed.

Specified by:

flush in interface SuspendableWriteChannel

Returns:

true if the message was flushed, or false if the result would block

Throws:

IOException - if an I/O error occurs

getCloseSetter

public ChannelListener.Setter<? extends AssembledMessageChannel> getCloseSetter()

Description copied from interface: MessageChannel

Get the setter which can be used to change the close listener for this channel. If the channel is already closed, then the listener will not be called.

Specified by:

getCloseSetter in interface CloseableChannel

Specified by:

getCloseSetter in interface MessageChannel

Specified by:

getCloseSetter in interface ReadableMessageChannel

Specified by:

getCloseSetter in interface SuspendableChannel

Specified by:

getCloseSetter in interface SuspendableReadChannel

Specified by:

getCloseSetter in interface SuspendableWriteChannel

Specified by:

getCloseSetter in interface WritableMessageChannel

Returns:

the setter

getWorker

public XnioWorker getWorker()

Description copied from interface: CloseableChannel

Get the worker for this channel.

Specified by:

getWorker in interface CloseableChannel

Returns:

the worker

close

public void close()
           throws IOException

Description copied from interface: CloseableChannel

Close this channel. When a channel is closed, its close listener is invoked. Invoking this method more than once has no additional effect.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Channel

Specified by:

close in interface InterruptibleChannel

Specified by:

close in interface CloseableChannel

Specified by:

close in interface SuspendableWriteChannel

Throws:

IOException - if the close failed

isOpen

public boolean isOpen()

Description copied from interface: SuspendableWriteChannel

Determine whether this channel is open. This method will return false if all directions are shut down, even if there is unflushed write data pending.

Specified by:

isOpen in interface Channel

Specified by:

isOpen in interface SuspendableWriteChannel

Returns:

true if the channel is open, false otherwise

supportsOption

public boolean supportsOption(Option<?> option)

Description copied from interface: Configurable

Determine whether an option is supported on this channel.

Specified by:

supportsOption in interface Configurable

Parameters:

option - the option

Returns:

true if it is supported

getOption

public <T> T getOption(Option<T> option)
                throws IOException

Description copied from interface: Configurable

Get the value of a channel option.

Specified by:

getOption in interface Configurable

Type Parameters:

T - the type of the option value

Parameters:

option - the option to get

Returns:

the value of the option, or null if it is not set

Throws:

IOException - if an I/O error occurred when reading the option

setOption

public <T> T setOption(Option<T> option,
                       T value)
                throws IllegalArgumentException,
                       IOException

Description copied from interface: Configurable

Set an option for this channel. Unsupported options are ignored.

Specified by:

setOption in interface Configurable

Type Parameters:

T - the type of the option value

Parameters:

option - the option to set

value - the value of the option to set

Returns:

the previous option value, if any

Throws:

IllegalArgumentException - if the value is not acceptable for this option

IOException - if an I/O error occurred when modifying the option