java.lang.Object | ||
↳ | java.nio.channels.Selector | |
↳ | java.nio.channels.spi.AbstractSelector |
Base implementation class for selectors.
This class encapsulates the low-level machinery required to implement
the interruption of selection operations. A concrete selector class must
invoke the This class also defines methods for maintaining a selector's
cancelled-key set and for removing a key from its channel's key set, and
declares the abstract 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:
try {
begin();
// Perform blocking I/O operation here
...
} finally {
end();
}
register
method that is invoked by a
selectable channel's register
method in order to perform the actual work of registering a channel.
Protected Constructors | |||||||||||
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Initializes a new instance of this class.
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Public Methods | |||||||||||
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Closes this selector.
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Tells whether or not this selector is open.
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Returns the provider that created this channel.
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Protected Methods | |||||||||||
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Marks the beginning of an I/O operation that might block indefinitely.
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Retrieves this selector's cancelled-key set.
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Removes the given key from its channel's key set.
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Marks the end of an I/O operation that might block indefinitely.
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Closes this selector.
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Registers the given channel with this selector.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.nio.channels.Selector
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From class
java.lang.Object
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Closes this selector.
If the selector has already been closed then this method returns
immediately. Otherwise it marks the selector as closed and then invokes
the implCloseSelector
method in order to
complete the close operation.
IOException | If an I/O error occurs |
---|
Tells whether or not this selector is open.
Returns the provider that created this channel.
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 interruption for
this selector.
Invoking this method arranges for the selector's wakeup
method to be invoked if a thread's interrupt
method is invoked while the thread is
blocked in an I/O operation upon the selector.
Retrieves this selector's cancelled-key set.
This set should only be used while synchronized upon it.
Removes the given key from its channel's key set.
This method must be invoked by the selector for each channel that it deregisters.
key | The selection key to be removed |
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Closes this selector.
This method is invoked by the close
method in order
to perform the actual work of closing the selector. This method is only
invoked if the selector 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 a selection operation upon this selector to return
immediately as if by invoking the wakeup
method.
IOException | If an I/O error occurs while closing the selector |
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Registers the given channel with this selector.
This method is invoked by a channel's register
method in order to perform
the actual work of registering the channel with this selector.
ch | The channel to be registered |
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ops | The initial interest set, which must be valid |
att | The initial attachment for the resulting key |