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

  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.

  Closes this channel.

  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.

Throws:
- IOException - If an I/O error occurs

  Adjusts this channel's blocking mode.

  Adjusts this channel's blocking mode.

If the given blocking mode is different from the current blocking mode then this method invokes the implConfigureBlocking method, while holding the appropriate locks, in order to change the mode.

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

  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

  Closes this channel.

  Closes this channel.

This method, which is specified in the AbstractInterruptibleChannel class and is invoked by the close method, in turn invokes the implCloseSelectableChannel method in order to perform the actual work of closing this channel. It then cancels all of this channel's keys.

  Closes this selectable channel.

  Closes this selectable 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.

  Adjusts this channel's blocking mode.

  Adjusts this channel's blocking mode.

This method is invoked by the configureBlocking method in order to perform the actual work of changing the blocking mode. This method is only invoked if the new mode is different from the current mode.

Throws:
- IOException - If an I/O error occurs

  Returns the provider that created this channel.

  Returns the provider that created this channel.
Returns: The provider that created this channel

  Registers this channel with the given selector, returning a selection key.

  Registers this channel with the given selector, returning a selection key.

An invocation of this convenience method of the form

sc.register(sel, ops)

behaves in exactly the same way as the invocation

sc.register(sel, ops, null)

Returns: A key representing the registration of this channel with the given selector
Parameters:
- sel - The selector with which this channel is to be registered
- ops - The interest set for the resulting key
Throws:
- ClosedChannelException - If this channel is closed
- IllegalBlockingModeException - If this channel is in blocking mode
- IllegalSelectorException - If this channel was not created by the same provider as the given selector
- CancelledKeyException - If this channel is currently registered with the given selector but the corresponding key has already been cancelled
- IllegalArgumentException - If a bit in ops does not correspond to an operation that is supported by this channel, that is, if set & ~validOps() != 0

  Registers this channel with the given selector, returning a selection key.

  Registers this channel with the given selector, returning a selection key.

This method first verifies that this channel is open and that the given initial interest set is valid.

If this channel is already registered with the given selector then the selection key representing that registration is returned after setting its interest set to the given value.

Otherwise this channel has not yet been registered with the given selector, so the register method of the selector is invoked while holding the appropriate locks. The resulting key is added to this channel's key set before being returned.