java.nio.channels.spi
Class AbstractInterruptibleChannel

java.lang.Object
  java.nio.channels.spi.AbstractInterruptibleChannel

All Implemented Interfaces:

Channel, InterruptibleChannel

Direct Known Subclasses:

FileChannel, SelectableChannel

public abstract class AbstractInterruptibleChannel

extends Object

implements Channel, InterruptibleChannel

Base implementation class for interruptible channels.

This class encapsulates the low-level machinery required to implement the asynchronous closing and interruption of channels. A concrete channel class must invoke the begin and end methods before and after, respectively, invoking an I/O operation that might block indefinitely. In order to ensure that the end method is always invoked, these methods should be used within a try ... finally block:

 boolean completed = false;
 try {
     begin();
     completed = ...;    // Perform blocking I/O operation
     return ...;         // Return result
 } finally {
     end(completed);
 }

The completed argument to the end method tells whether or not the I/O operation actually completed, that is, whether it had any effect that would be visible to the invoker. In the case of an operation that reads bytes, for example, this argument should be true if, and only if, some bytes were actually transferred into the invoker's target buffer.

A concrete channel class must also implement the implCloseChannel method in such a way that if it is invoked while another thread is blocked in a native I/O operation upon the channel then that operation will immediately return, either by throwing an exception or by returning normally. If a thread is interrupted or the channel upon which it is blocked is asynchronously closed then the channel's end method will throw the appropriate exception.

This class performs the synchronization required to implement the Channel specification. Implementations of the implCloseChannel method need not synchronize against other threads that might be attempting to close the channel.

Since:

1.4

Constructor Summary

protected

AbstractInterruptibleChannel() Initializes a new instance of this class.

Method Summary

protected void	begin() Marks the beginning of an I/O operation that might block indefinitely.
void	close() Closes this channel.
protected void	end(boolean completed) Marks the end of an I/O operation that might block indefinitely.
protected abstract void	implCloseChannel() Closes this channel.
boolean	isOpen() Tells whether or not this channel is open.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractInterruptibleChannel

protected AbstractInterruptibleChannel()

Initializes a new instance of this class.

Method Detail

close

public final void close()
                 throws IOException

Closes this channel.

If the channel has already been closed then this method returns immediately. Otherwise it marks the channel as closed and then invokes the implCloseChannel method in order to complete the close operation.

Specified by:

close in interface Channel

Throws:

IOException - If an I/O error occurs

implCloseChannel

protected abstract void implCloseChannel()
                                  throws IOException

Closes this channel.

This method is invoked by the close method in order to perform the actual work of closing the channel. This method is only invoked if the channel has not yet been closed, and it is never invoked more than once.

An implementation of this method must arrange for any other thread that is blocked in an I/O operation upon this channel to return immediately, either by throwing an exception or by returning normally.

Throws:

IOException - If an I/O error occurs while closing the channel

isOpen

public final boolean isOpen()

Description copied from interface: Channel

Tells whether or not this channel is open.

Specified by:

isOpen in interface Channel

Returns:

true if, and only if, this channel is open

begin

protected final void begin()

Marks the beginning of an I/O operation that might block indefinitely.

This method should be invoked in tandem with the end method, using a try ... finally block as shown above, in order to implement asynchronous closing and interruption for this channel.

end

protected final void end(boolean completed)
                  throws AsynchronousCloseException

Marks the end of an I/O operation that might block indefinitely.

This method should be invoked in tandem with the begin method, using a try ... finally block as shown above, in order to implement asynchronous closing and interruption for this channel.

Parameters:

completed - true if, and only if, the I/O operation completed successfully, that is, had some effect that would be visible to the operation's invoker

Throws:

AsynchronousCloseException - If the channel was asynchronously closed

ClosedByInterruptException - If the thread blocked in the I/O operation was interrupted