org.xnio.conduits

Class PushBackStreamSourceConduit

java.lang.Object

org.xnio.conduits.AbstractConduit<D>

org.xnio.conduits.AbstractSourceConduit<D>

org.xnio.conduits.AbstractStreamSourceConduit<StreamSourceConduit>

org.xnio.conduits.PushBackStreamSourceConduit

All Implemented Interfaces:

Conduit, SourceConduit, StreamSourceConduit

public final class PushBackStreamSourceConduit
extends AbstractStreamSourceConduit<StreamSourceConduit>
implements StreamSourceConduit

A stream source conduit which allows buffers to be "pushed back" to the head of the stream.

Author:

David M. Lloyd

Field Summary

Fields inherited from class org.xnio.conduits.AbstractConduit

next

Constructor Summary

Constructors

Constructor and Description
PushBackStreamSourceConduit(StreamSourceConduit next) 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.
void	pushBack(Pooled<ByteBuffer> pooledBuffer) Push a buffer back to the head of the stream.
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	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.

Methods inherited from class org.xnio.conduits.AbstractSourceConduit

getReadThread, isReadResumed, isReadShutdown, suspendReads, wakeupReads

Methods inherited from class org.xnio.conduits.AbstractConduit

getWorker

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.xnio.conduits.SourceConduit

getReadThread, isReadResumed, isReadShutdown, suspendReads, wakeupReads

Methods inherited from interface org.xnio.conduits.Conduit

getWorker

Constructor Detail

PushBackStreamSourceConduit

public PushBackStreamSourceConduit(StreamSourceConduit next)

Construct a new instance.

Parameters:

next - the delegate conduit to set

Method Detail

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

Overrides:

resumeReads in class AbstractSourceConduit<StreamSourceConduit>

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

Overrides:

read in class AbstractStreamSourceConduit<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

Overrides:

read in class AbstractStreamSourceConduit<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

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

Overrides:

transferTo in class AbstractStreamSourceConduit<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

Overrides:

transferTo in class AbstractStreamSourceConduit<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

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

Overrides:

awaitReadable in class AbstractSourceConduit<StreamSourceConduit>

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

Overrides:

awaitReadable in class AbstractSourceConduit<StreamSourceConduit>

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

Overrides:

terminateReads in class AbstractSourceConduit<StreamSourceConduit>

Throws:

IOException - if there was a problem

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

Overrides:

setReadReadyHandler in class AbstractSourceConduit<StreamSourceConduit>

pushBack

public void pushBack(Pooled<ByteBuffer> pooledBuffer)

Push a buffer back to the head of the stream. Once the buffer data is consumed, it will be released back to its original pool (if any).

Parameters:

pooledBuffer - the buffer to push back