Java™ Platform
Standard Ed. 6

java.nio.channels.spi
Class AbstractInterruptibleChannel

java.lang.Object
  extended by java.nio.channels.spi.AbstractInterruptibleChannel
All Implemented Interfaces:
Closeable, 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 Closeable
Specified by:
close in interface Channel
Specified by:
close in interface InterruptibleChannel
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

Java™ Platform
Standard Ed. 6

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