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package java.nio.channels;
import java.io.IOException;
import java.nio.channels.spi.*;
/**
* A pair of channels that implements a unidirectional pipe.
*
* A pipe consists of a pair of channels: A writable {@link
* Pipe.SinkChannel sink} channel and a readable {@link Pipe.SourceChannel source}
* channel. Once some bytes are written to the sink channel they can be read
* from source channel in exactlyAthe order in which they were written.
*
*
Whether or not a thread writing bytes to a pipe will block until another
* thread reads those bytes, or some previously-written bytes, from the pipe is
* system-dependent and therefore unspecified. Many pipe implementations will
* buffer up to a certain number of bytes between the sink and source channels,
* but such buffering should not be assumed.
*
*
* @author Mark Reinhold
* @author JSR-51 Expert Group
* @since 1.4
*/
public abstract class Pipe {
/**
* A channel representing the readable end of a {@link Pipe}.
*
* @since 1.4
*/
public static abstract class SourceChannel
extends AbstractSelectableChannel
implements ReadableByteChannel, ScatteringByteChannel
{
/**
* Constructs a new instance of this class.
*
* @param provider
* The selector provider
*/
protected SourceChannel(SelectorProvider provider) {
super(provider);
}
/**
* Returns an operation set identifying this channel's supported
* operations.
*
* Pipe-source channels only support reading, so this method
* returns {@link SelectionKey#OP_READ}.
*
* @return The valid-operation set
*/
public final int validOps() {
return SelectionKey.OP_READ;
}
}
/**
* A channel representing the writable end of a {@link Pipe}.
*
* @since 1.4
*/
public static abstract class SinkChannel
extends AbstractSelectableChannel
implements WritableByteChannel, GatheringByteChannel
{
/**
* Initializes a new instance of this class.
*
* @param provider
* The selector provider
*/
protected SinkChannel(SelectorProvider provider) {
super(provider);
}
/**
* Returns an operation set identifying this channel's supported
* operations.
*
* Pipe-sink channels only support writing, so this method returns
* {@link SelectionKey#OP_WRITE}.
*
* @return The valid-operation set
*/
public final int validOps() {
return SelectionKey.OP_WRITE;
}
}
/**
* Initializes a new instance of this class.
*/
protected Pipe() { }
/**
* Returns this pipe's source channel.
*
* @return This pipe's source channel
*/
public abstract SourceChannel source();
/**
* Returns this pipe's sink channel.
*
* @return This pipe's sink channel
*/
public abstract SinkChannel sink();
/**
* Opens a pipe.
*
* The new pipe is created by invoking the {@link
* java.nio.channels.spi.SelectorProvider#openPipe openPipe} method of the
* system-wide default {@link java.nio.channels.spi.SelectorProvider}
* object.
*
* @return A new pipe
*
* @throws IOException
* If an I/O error occurs
*/
public static Pipe open() throws IOException {
return SelectorProvider.provider().openPipe();
}
}