io.undertow.conduits

Class EmptyStreamSourceConduit

java.lang.Object

io.undertow.conduits.EmptyStreamSourceConduit

All Implemented Interfaces:

Conduit, SourceConduit, StreamSourceConduit

public final class EmptyStreamSourceConduit
extends Object
implements StreamSourceConduit

A stream source conduit which is always empty. Temporary copy from XNIO, see https://issues.jboss.org/browse/XNIO-199

Author:

David M. Lloyd

Constructor Summary

Constructors

Constructor and Description
EmptyStreamSourceConduit(XnioIoThread readThread) 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 conduit becomes readable again, or until the timeout expires.
XnioIoThread	getReadThread() Get the XNIO read thread.
XnioWorker	getWorker() Get the XNIO worker associated with this conduit.
boolean	isReadResumed() Determine whether read notifications are currently enabled.
boolean	isReadShutdown() Determine whether reads have been shut down on this conduit.
int	read(ByteBuffer dst) Read a sequence of bytes from this conduit to the given buffer.
long	read(ByteBuffer[] dsts, int offs, int len) Read a sequence of bytes from this conduit to the given buffers.
void	resumeReads() Indicate that the conduit's ReadReadyHandler should be invoked as soon as data can be read without blocking.
void	setReadReadyHandler(ReadReadyHandler handler) Set the handler which should receive readiness notifications.
void	suspendReads() Indicate that calling the conduit's ReadReadyHandler should be suspended.
void	terminateReads() Indicate that no more data will be read from this conduit.
long	transferTo(long count, ByteBuffer throughBuffer, StreamSinkChannel target) Transfers bytes into the given channel target.
long	transferTo(long position, long count, FileChannel target) Transfers bytes into the given file from this channel.
void	wakeupReads() Indicate that the conduit's ReadReadyHandler should be invoked immediately, and then again as soon as data can be read without blocking.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyStreamSourceConduit

public EmptyStreamSourceConduit(XnioIoThread readThread)

Construct a new instance.

Parameters:

readThread - the read thread for this conduit

Method Detail

setReadReadyHandler

public void setReadReadyHandler(ReadReadyHandler handler)

Description copied from interface: SourceConduit

Set the handler which should receive readiness notifications. A filter may pass this invocation on to the filter it wraps, or it may substitute itself.

Specified by:

setReadReadyHandler in interface SourceConduit

transferTo

public long transferTo(long position,
                       long count,
                       FileChannel target)
                throws IOException

Description copied from interface: StreamSourceConduit

Transfers bytes into the given file from this channel.

Specified by:

transferTo in interface StreamSourceConduit

Parameters:

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

count - the number of bytes to be transferred

target - the file to write to

Returns:

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

Throws:

IOException - if an I/O error occurs

transferTo

public long transferTo(long count,
                       ByteBuffer throughBuffer,
                       StreamSinkChannel target)
                throws IOException

Description copied from interface: StreamSourceConduit

Transfers bytes into the given channel target. On entry, throughBuffer will be cleared. On exit, the buffer will be flipped for emptying, and may possibly 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 this channel which must be written to target to complete the operation.

Specified by:

transferTo in interface StreamSourceConduit

Parameters:

count - the number of bytes to be transferred

throughBuffer - the buffer to copy through.

target - the destination to write to

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

read

public int read(ByteBuffer dst)
         throws IOException

Description copied from interface: StreamSourceConduit

Read a sequence of bytes from this conduit to the given buffer.

Specified by:

read in interface StreamSourceConduit

Returns:

the number of bytes (possibly 0) that were actually transferred, or -1 if the end of input was reached or this conduit's SourceConduit.terminateReads() method was previously called

Throws:

IOException - if an error occurs

read

public long read(ByteBuffer[] dsts,
                 int offs,
                 int len)
          throws IOException

Description copied from interface: StreamSourceConduit

Read a sequence of bytes from this conduit to the given buffers.

Specified by:

read in interface StreamSourceConduit

offs - the offset into the buffer array

len - the number of buffers to fill

Returns:

the number of bytes (possibly 0) that were actually transferred, or -1 if the end of input was reached or this conduit's SourceConduit.terminateReads() method was previously called

Throws:

IOException - if an error occurs

isReadShutdown

public boolean isReadShutdown()

Description copied from interface: SourceConduit

Determine whether reads have been shut down on this conduit.

Specified by:

isReadShutdown in interface SourceConduit

Returns:

true if writes are shut down, false otherwise

resumeReads

public void resumeReads()

Description copied from interface: SourceConduit

Indicate that the conduit's ReadReadyHandler should be invoked as soon as data can be read without blocking.

Specified by:

resumeReads in interface SourceConduit

suspendReads

public void suspendReads()

Description copied from interface: SourceConduit

Indicate that calling the conduit's ReadReadyHandler should be suspended.

Specified by:

suspendReads in interface SourceConduit

wakeupReads

public void wakeupReads()

Description copied from interface: SourceConduit

Indicate that the conduit's ReadReadyHandler should be invoked immediately, and then again as soon as data can be read without blocking.

Specified by:

wakeupReads in interface SourceConduit

isReadResumed

public boolean isReadResumed()

Description copied from interface: SourceConduit

Determine whether read notifications are currently enabled.

Specified by:

isReadResumed in interface SourceConduit

Returns:

true if read notifications are enabled

awaitReadable

public void awaitReadable()
                   throws IOException

Description copied from interface: SourceConduit

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

Specified by:

awaitReadable in interface SourceConduit

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: SourceConduit

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

Specified by:

awaitReadable in interface SourceConduit

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

terminateReads

public void terminateReads()
                    throws IOException

Description copied from interface: SourceConduit

Indicate that no more data will be read from this conduit. If unread data exists, an exception may be thrown.

Specified by:

terminateReads in interface SourceConduit

Throws:

IOException - if there was a problem

getReadThread

public XnioIoThread getReadThread()

Description copied from interface: SourceConduit

Get the XNIO read thread.

Specified by:

getReadThread in interface SourceConduit

Returns:

the XNIO read thread

getWorker

public XnioWorker getWorker()

Description copied from interface: Conduit

Get the XNIO worker associated with this conduit.

Specified by:

getWorker in interface Conduit

Returns:

the XNIO worker associated with this conduit