Class KqueueSelectorImpl

public KqueueSelectorImpl(SelectorProvider provider)
            throws IOException

Initializes the slector.

Parameters:

provider - the provider that created this selector

public boolean equals(Object o)

Determine whether this Object is semantically equal to another Object.

There are some fairly strict requirements on this method which subclasses must follow:

• It must be transitive. If a.equals(b) and b.equals(c), then a.equals(c) must be true as well.
• It must be symmetric. a.equals(b) and b.equals(a) must have the same value.
• It must be reflexive. a.equals(a) must always be true.
• It must be consistent. Whichever value a.equals(b) returns on the first invocation must be the value returned on all later invocations.
• a.equals(null) must be false.
• It must be consistent with hashCode(). That is, a.equals(b) must imply a.hashCode() == b.hashCode(). The reverse is not true; two objects that are not equal may have the same hashcode, but that has the potential to harm hashing performance.

This is typically overridden to throw a ClassCastException if the argument is not comparable to the class performing the comparison, but that is not a requirement. It is legal for a.equals(b) to be true even though a.getClass() != b.getClass(). Also, it is typical to never cause a NullPointerException.

In general, the Collections API (java.util) use the equals method rather than the == operator to compare objects. However, IdentityHashMap is an exception to this rule, for its own good reasons.

The default implementation returns this == o.

Overrides:

equals in interface Object

Parameters:

Returns:

whether this Object is semantically equal to another

See Also:

Object.hashCode()

protected void implCloseSelector()
            throws IOException

Closes the channel.

Overrides:

implCloseSelector in interface AbstractSelector

Throws:

IOException - if an error occurs

public Set<E> keys()

Returns this selector's key set.

Overrides:

keys in interface Selector

Throws:

ClosedSelectorException - If this selector is closed.

public static boolean kqueue_supported()

Tell if kqueue-based selectors are supported on this system.

Returns:

True if this system has kqueue support, and support for it was compiled in to Classpath.

protected SelectionKey register(AbstractSelectableChannel channel,
                                int interestOps,
                                Object attachment)

Registers a channel for the selection process.

Overrides:

register in interface AbstractSelector

Parameters:

Returns:

the registered selection key

public int select()
            throws IOException

Selects a set of keys whose corresponding channels are ready for I/O operations.

Overrides:

select in interface Selector

Throws:

ClosedSelectorException - If this selector is closed.

IOException - If an error occurs

public int select(long timeout)
            throws IOException

Selects a set of keys whose corresponding channels are ready for I/O operations.

Overrides:

select in interface Selector

Parameters:

timeout - The timeout to use.

Throws:

ClosedSelectorException - If this selector is closed.

IllegalArgumentException - If the timeout value is negative.

IOException - If an error occurs

public int selectNow()
            throws IOException

Selects a set of keys whose corresponding channels are ready for I/O operations.

Overrides:

selectNow in interface Selector

Throws:

ClosedSelectorException - If this selector is closed.

IOException - If an error occurs

public Set<E> selectedKeys()

Returns this selector's selected-key set.

Overrides:

selectedKeys in interface Selector

Throws:

ClosedSelectorException - If this selector is closed.

public String toString()

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() and such.

It is typical, but not required, to ensure that this method never completes abruptly with a RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

Overrides:

toString in interface Object

Returns:

the String representing this Object, which may be null

See Also:

getClass(), Object.hashCode(), Class.getName(), Integer.toHexString(int)

public Selector wakeup()

Causes the first selection operation that has not yet returned to return immediately.

Overrides:

wakeup in interface Selector