io.undertow.server.protocol.framed

Class AbstractFramedStreamSinkChannel<C extends AbstractFramedChannel<C,R,S>,R extends AbstractFramedStreamSourceChannel<C,R,S>,S extends AbstractFramedStreamSinkChannel<C,R,S>>

java.lang.Object

io.undertow.server.protocol.framed.AbstractFramedStreamSinkChannel<C,R,S>

All Implemented Interfaces:

Closeable, AutoCloseable, Channel, GatheringByteChannel, InterruptibleChannel, WritableByteChannel, CloseableChannel, Configurable, StreamSinkChannel, SuspendableWriteChannel

Direct Known Subclasses:

AbstractAjpClientStreamSinkChannel, AbstractHttp2StreamSinkChannel, StreamSinkFrameChannel

public abstract class AbstractFramedStreamSinkChannel<C extends AbstractFramedChannel<C,R,S>,R extends AbstractFramedStreamSourceChannel<C,R,S>,S extends AbstractFramedStreamSinkChannel<C,R,S>>
extends Object
implements StreamSinkChannel

Framed Stream Sink Channel.

Thread safety notes:

The general contract is that this channel is only to be used by a single thread at a time. The only exception to this is during flush. A flush will only happen when readyForFlush is set, and while this bit is set the buffer must not be modified.

Author:

Stuart Douglas

Field Summary

Fields inherited from interface org.xnio.channels.Configurable

EMPTY

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractFramedStreamSinkChannel(C channel)

Method Summary

Modifier and Type	Method and Description
void	awaitWritable() Block until this channel becomes writable again.
void	awaitWritable(long l, TimeUnit timeUnit) Block until this channel becomes writable again, or until the timeout expires.
protected void	channelForciblyClosed() Called when a channel has been forcibly closed, and data (frames) have already been written.
void	close() Close this channel.
protected SendFrameHeader	createFrameHeader()
boolean	flush() Flush any waiting partial send or write.
ByteBuffer	getBuffer()
C	getChannel()
ChannelListener.Setter<? extends S>	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> tOption) Get the value of a channel option.
XnioWorker	getWorker() Get the worker for this channel.
ChannelListener.Setter<? extends S>	getWriteSetter() Get the setter which can be used to change the write listener for this channel.
XnioExecutor	getWriteThread() Get the write thread for this channel.
protected void	handleFlushComplete(boolean finalFrame)
boolean	isBroken()
boolean	isBufferFull()
protected boolean	isFinalFrameQueued()
protected boolean	isFirstDataWritten()
protected boolean	isFlushRequiredOnEmptyBuffer()
protected abstract boolean	isLastFrame()
boolean	isOpen() Determine whether this channel is open.
boolean	isReadyForFlush()
boolean	isWriteResumed() Determine whether writes are resumed.
boolean	isWritesShutdown() Returns true writes have been shutdown
void	markBroken()
protected PooledByteBuffer	preWriteTransform(PooledByteBuffer body)
void	resumeWrites() Resume writes on this channel.
protected void	resumeWritesInternal(boolean wakeup)
protected boolean	safeToSend()
boolean	send(PooledByteBuffer pooled) Send a buffer to this channel.
protected boolean	sendInternal(PooledByteBuffer pooled)
<T> T	setOption(Option<T> tOption, T t) Set an option for this channel.
void	shutdownWrites() Indicate that writing is complete for this channel.
boolean	supportsOption(Option<?> option) Determine whether an option is supported on this channel.
void	suspendWrites() Suspend further write notifications on this channel.
long	transferFrom(FileChannel src, long position, long count) Transfer bytes into this channel from the given file.
long	transferFrom(StreamSourceChannel source, long count, ByteBuffer throughBuffer) Transfers bytes from the given channel source.
void	wakeupWrites() Resume writes on this channel, and force the write listener to be triggered even if the channel isn't actually writable.
int	write(ByteBuffer src)
long	write(ByteBuffer[] srcs)
long	write(ByteBuffer[] srcs, int offset, int length)
int	writeFinal(ByteBuffer src) Writes some data to the channel, with the same semantics as WritableByteChannel.write(java.nio.ByteBuffer).
long	writeFinal(ByteBuffer[] srcs) Writes some data to the channel, with the same semantics as GatheringByteChannel.write(java.nio.ByteBuffer[]).
long	writeFinal(ByteBuffer[] srcs, int offset, int length) Writes some data to the channel, with the same semantics as GatheringByteChannel.write(java.nio.ByteBuffer[], int, int).

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractFramedStreamSinkChannel

protected AbstractFramedStreamSinkChannel(C channel)

Method Detail

transferFrom

public long transferFrom(FileChannel src,
                         long position,
                         long count)
                  throws IOException

Description copied from interface: StreamSinkChannel

Transfer bytes into this channel from the given file. Using this method in preference to FileChannel.transferTo(long, long, WritableByteChannel) may provide a performance advantage on some platforms.

If the current thread is interrupted when this method is called, it may throw a InterruptedIOException; however, if this exception is thrown, the InterruptedIOException.bytesTransferred field is guaranteed to be 0.

Specified by:

transferFrom in interface StreamSinkChannel

Parameters:

src - the file to read from

position - the position within the file from which the transfer is to begin

count - the number of bytes to be transferred

Returns:

the number of bytes (possibly 0) that were actually transferred

Throws:

IOException - if an I/O error occurs

transferFrom

public long transferFrom(StreamSourceChannel source,
                         long count,
                         ByteBuffer throughBuffer)
                  throws IOException

Description copied from interface: StreamSinkChannel

Transfers bytes from the given channel source. On some platforms, this may avoid copying bytes between user and kernel space. On other platforms, bytes are passed through the throughBuffer parameter's buffer space. On entry, throughBuffer will be cleared. On exit, the buffer will be flipped for emptying, and may be empty or may contain data. If this method returns a value less than count, then the remaining data in throughBuffer may contain data read from source which must be written to this channel to complete the operation. Note that using a direct buffer may provide an intermediate performance gain on platforms without zero-copy facilities.

If the current thread is interrupted when this method is called, it may throw a InterruptedIOException; however, if this exception is thrown, the InterruptedIOException.bytesTransferred field is guaranteed to be 0.

Specified by:

transferFrom in interface StreamSinkChannel

Parameters:

source - the source to read from

count - the number of bytes to be transferred

throughBuffer - the buffer to copy through.

Returns:

the number of bytes (possibly 0) that were actually transferred, or -1 if the end of input was reached

Throws:

IOException - if an I/O error occurs

suspendWrites

public void suspendWrites()

Description copied from interface: SuspendableWriteChannel

Suspend further write notifications on this channel.

Specified by:

suspendWrites in interface SuspendableWriteChannel

createFrameHeader

protected SendFrameHeader createFrameHeader()
                                     throws IOException

Throws:

IOException

preWriteTransform

protected PooledByteBuffer preWriteTransform(PooledByteBuffer body)

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

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

resumeWritesInternal

protected void resumeWritesInternal(boolean wakeup)

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

isFinalFrameQueued

protected boolean isFinalFrameQueued()

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 l,
                          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:

l - 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

public XnioExecutor getWriteThread()

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

getWriteSetter

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

Description copied from interface: StreamSinkChannel

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

Specified by:

getWriteSetter in interface StreamSinkChannel

Specified by:

getWriteSetter in interface SuspendableWriteChannel

Returns:

the setter

getCloseSetter

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

Description copied from interface: StreamSinkChannel

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 StreamSinkChannel

Specified by:

getCloseSetter in interface SuspendableWriteChannel

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

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

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

isFlushRequiredOnEmptyBuffer

protected boolean isFlushRequiredOnEmptyBuffer()

write

public long write(ByteBuffer[] srcs,
                  int offset,
                  int length)
           throws IOException

Specified by:

write in interface GatheringByteChannel

Throws:

IOException

write

public long write(ByteBuffer[] srcs)
           throws IOException

Specified by:

write in interface GatheringByteChannel

Throws:

IOException

write

public int write(ByteBuffer src)
          throws IOException

Specified by:

write in interface WritableByteChannel

Throws:

IOException

send

public boolean send(PooledByteBuffer pooled)
             throws IOException

Send a buffer to this channel.

Parameters:

pooled - Pooled ByteBuffer to send. The buffer should have data available. This channel will free the buffer after sending data

Returns:

true if the buffer was accepted; false if the channel needs to first be flushed

Throws:

IOException - if this channel is closed

sendInternal

protected boolean sendInternal(PooledByteBuffer pooled)
                        throws IOException

Throws:

IOException

safeToSend

protected boolean safeToSend()
                      throws IOException

Throws:

IOException

writeFinal

public long writeFinal(ByteBuffer[] srcs,
                       int offset,
                       int length)
                throws IOException

Description copied from interface: StreamSinkChannel

Writes some data to the channel, with the same semantics as GatheringByteChannel.write(java.nio.ByteBuffer[], int, int). If all the data is written out then the channel will have its writes shutdown. If an exception is thrown the caller is still responsible for closing the channel.

Specified by:

writeFinal in interface StreamSinkChannel

Parameters:

srcs - The buffers from which bytes are to be retrieved

offset - The offset within the buffer array of the first buffer from which bytes are to be retrieved; must be non-negative and no larger than srcs.length

length - The maximum number of buffers to be accessed; must be non-negative and no larger than srcs.length - offset

Returns:

The amount of data that was actually written

Throws:

IOException

See Also:

GatheringByteChannel.write(java.nio.ByteBuffer[], int, int), SuspendableWriteChannel.shutdownWrites()

writeFinal

public long writeFinal(ByteBuffer[] srcs)
                throws IOException

Description copied from interface: StreamSinkChannel

Writes some data to the channel, with the same semantics as GatheringByteChannel.write(java.nio.ByteBuffer[]). If all the data is written out then the channel will have its writes shutdown. If an exception is thrown the caller is still responsible for closing the channel.

Specified by:

writeFinal in interface StreamSinkChannel

Parameters:

srcs - The buffers from which bytes are to be retrieved

Returns:

The amount of data that was actually written

Throws:

IOException

See Also:

GatheringByteChannel.write(java.nio.ByteBuffer[]), SuspendableWriteChannel.shutdownWrites()

writeFinal

public int writeFinal(ByteBuffer src)
               throws IOException

Description copied from interface: StreamSinkChannel

Writes some data to the channel, with the same semantics as WritableByteChannel.write(java.nio.ByteBuffer). If all the data is written out then the channel will have its writes shutdown. Semantically this method is equivalent to: int rem = src.remaining(); int written = channel.write(src); if(written == rem) { channel.shutdownWrites() } If an exception is thrown the caller is still responsible for closing the channel.

Specified by:

writeFinal in interface StreamSinkChannel

Parameters:

src - The data to write

Returns:

The amount of data that was actually written.

Throws:

IOException

See Also:

WritableByteChannel.write(java.nio.ByteBuffer), SuspendableWriteChannel.shutdownWrites()

isLastFrame

protected abstract boolean isLastFrame()

Returns:

true If this is the last frame that will be sent on this connection

isReadyForFlush

public boolean isReadyForFlush()

Returns:

true if the channel is ready to be flushed. When a channel is ready to be flushed nothing should modify the buffer, as it may be written out by another thread.

isWritesShutdown

public boolean isWritesShutdown()

Returns true writes have been shutdown

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

close

public void close()
           throws IOException

Description copied from interface: SuspendableWriteChannel

Close this channel. If data has been written but not flushed, that data may be discarded, depending on the channel implementation. 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

channelForciblyClosed

protected void channelForciblyClosed()
                              throws IOException

Called when a channel has been forcibly closed, and data (frames) have already been written. The action this should take is protocol dependent, e.g. for SPDY a RST_STREAM should be sent, for websockets the channel should be closed. By default this will just close the underlying channel

Throws:

IOException

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> tOption)
                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:

tOption - 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> tOption,
                       T t)
                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:

tOption - the option to set

t - 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

getBuffer

public ByteBuffer getBuffer()

handleFlushComplete

protected void handleFlushComplete(boolean finalFrame)

isFirstDataWritten

protected boolean isFirstDataWritten()

markBroken

public void markBroken()

getChannel

public C getChannel()

isBroken

public boolean isBroken()

isBufferFull

public boolean isBufferFull()