Package Summary  Overview Summary

class:AbstractInterruptibleChannel [NONE]

All Implemented Interfaces:
Closeable, AutoCloseable, 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:AbstractInterruptibleChannel() [NONE]

  • AbstractInterruptibleChannel

    protected AbstractInterruptibleChannel()
    Initializes a new instance of this class.

method:close() [NONE]

  • 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 AutoCloseable
    Specified by:
    close in interface Channel
    Specified by:
    close in interface Closeable
    Specified by:
    close in interface InterruptibleChannel
    Throws:
    IOException - If an I/O error occurs
  • method:implCloseChannel() [NONE]

    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

    method:begin() [NONE]

    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.

    method:end(boolean) [NONE]

    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