org.xnio.channels

Interface StreamSourceChannel

All Superinterfaces:

AutoCloseable, Channel, Closeable, CloseableChannel, Configurable, InterruptibleChannel, ReadableByteChannel, ScatteringByteChannel, SuspendableReadChannel

All Known Subinterfaces:

ConnectedSslStreamChannel, ConnectedStreamChannel, StreamChannel

All Known Implementing Classes:

AssembledConnectedSslStreamChannel, AssembledConnectedStreamChannel, AssembledStreamChannel, ConduitStreamSourceChannel, EmptyStreamSourceChannel, FixedLengthStreamSourceChannel, PushBackStreamChannel, SplitStreamSourceChannel

public interface StreamSourceChannel
extends ReadableByteChannel, ScatteringByteChannel, SuspendableReadChannel

A stream source channel. This type of channel is a readable source for bytes. While all channel types are thread-safe, reading a stream from more than one thread concurrently will cause data corruption and may be disallowed at the option of the implementation.

Field Summary

Fields inherited from interface org.xnio.channels.Configurable

EMPTY

Method Summary

Modifier and Type	Method and Description
ChannelListener.Setter<? extends StreamSourceChannel>	getCloseSetter() Get the setter which can be used to change the close listener for this channel.
ChannelListener.Setter<? extends StreamSourceChannel>	getReadSetter() Get the setter which can be used to change the read listener for this channel.
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 interface java.nio.channels.ScatteringByteChannel

read, read

Methods inherited from interface java.nio.channels.ReadableByteChannel

read

Methods inherited from interface org.xnio.channels.SuspendableReadChannel

awaitReadable, awaitReadable, getReadThread, isReadResumed, resumeReads, shutdownReads, suspendReads, wakeupReads

Methods inherited from interface org.xnio.channels.CloseableChannel

close, getIoThread, getWorker

Methods inherited from interface java.nio.channels.Channel

isOpen

Methods inherited from interface org.xnio.channels.Configurable

getOption, setOption, supportsOption

Method Detail

transferTo

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

Transfers bytes into the given file from this channel. Using this method in preference to FileChannel.transferFrom(ReadableByteChannel, long, long) 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.

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

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

Transfers bytes into the given channel target. 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 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. 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. Note that the return value is the amount of data that was actually transferred to the StreamSinkChannel. The actual amount of data read could be larger than this, and can be calculated by adding the return value and the amount of data left in throughBuffer.

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

getReadSetter

ChannelListener.Setter<? extends StreamSourceChannel> getReadSetter()

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

Specified by:

getReadSetter in interface SuspendableReadChannel

Returns:

the setter

getCloseSetter

ChannelListener.Setter<? extends StreamSourceChannel> getCloseSetter()

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 SuspendableReadChannel

Returns:

the setter