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java.nio.channels.spi
class SelectorProvider

java.lang.Object extended by java.nio.channels.spi.SelectorProvider

public abstract class SelectorProvider
extends Object

Service-provider class for selectors and selectable channels.

A selector provider is a concrete subclass of this class that has a zero-argument constructor and implements the abstract methods specified below. A given invocation of the Java virtual machine maintains a single system-wide default provider instance, which is returned by the {@link #provider() provider} method. The first invocation of that method will locate the default provider as specified below.

The system-wide default provider is used by the static open methods of the {@link java.nio.channels.DatagramChannel#open DatagramChannel}, {@link java.nio.channels.Pipe#open Pipe}, {@link java.nio.channels.Selector#open Selector}, {@link java.nio.channels.ServerSocketChannel#open ServerSocketChannel}, and {@link java.nio.channels.SocketChannel#open SocketChannel} classes. It is also used by the {@link java.lang.System#inheritedChannel System.inheritedChannel()} method. A program may make use of a provider other than the default provider by instantiating that provider and then directly invoking the open methods defined in this class.

All of the methods in this class are safe for use by multiple concurrent threads.


Constructor Summary
protected

          Initializes a new instance of this class.
 
Method Summary
 Channel

          Returns the channel inherited from the entity that created this Java virtual machine.
abstract DatagramChannel

          Opens a datagram channel.
abstract Pipe

          Opens a pipe.
abstract AbstractSelector

          Opens a selector.
abstract ServerSocketChannel

          Opens a server-socket channel.
abstract SocketChannel

          Opens a socket channel.
static SelectorProvider

          Returns the system-wide default selector provider for this invocation of the Java virtual machine.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SelectorProvider

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

Method Detail

inheritedChannel

public Channel inheritedChannel()
                         throws IOException
Returns the channel inherited from the entity that created this Java virtual machine.

On many operating systems a process, such as a Java virtual machine, can be started in a manner that allows the process to inherit a channel from the entity that created the process. The manner in which this is done is system dependent, as are the possible entities to which the channel may be connected. For example, on UNIX systems, the Internet services daemon (inetd) is used to start programs to service requests when a request arrives on an associated network port. In this example, the process that is started, inherits a channel representing a network socket.

In cases where the inherited channel represents a network socket then the {@link java.nio.channels.Channel Channel} type returned by this method is determined as follows:

In addition to the network-oriented channels described, this method may return other kinds of channels in the future.

The first invocation of this method creates the channel that is returned. Subsequent invocations of this method return the same channel.

Returns:
The inherited channel, if any, otherwise null.
Throws:
IOException - If an I/O error occurs

openDatagramChannel

public abstract DatagramChannel openDatagramChannel()
                                             throws IOException
Opens a datagram channel.

Returns:
The new channel
Throws:
IOException

openPipe

public abstract Pipe openPipe()
                       throws IOException
Opens a pipe.

Returns:
The new pipe
Throws:
IOException

openSelector

public abstract AbstractSelector openSelector()
                                       throws IOException
Opens a selector.

Returns:
The new selector
Throws:
IOException

openServerSocketChannel

public abstract ServerSocketChannel openServerSocketChannel()
                                                     throws IOException
Opens a server-socket channel.

Returns:
The new channel
Throws:
IOException

openSocketChannel

public abstract SocketChannel openSocketChannel()
                                         throws IOException
Opens a socket channel.

Returns:
The new channel
Throws:
IOException

provider

public static SelectorProvider provider()
Returns the system-wide default selector provider for this invocation of the Java virtual machine.

The first invocation of this method locates the default provider object as follows:

  1. If the system property java.nio.channels.spi.SelectorProvider is defined then it is taken to be the fully-qualified name of a concrete provider class. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.

  2. If a provider class has been installed in a jar file that is visible to the system class loader, and that jar file contains a provider-configuration file named java.nio.channels.spi.SelectorProvider in the resource directory META-INF/services, then the first class name specified in that file is taken. The class is loaded and instantiated; if this process fails then an unspecified error is thrown.

  3. Finally, if no provider has been specified by any of the above means then the system-default provider class is instantiated and the result is returned.

Subsequent invocations of this method return the provider that was returned by the first invocation.

Returns:
The system-wide default selector provider


This documentation differs from the official API. Jadeite adds extra features to the API including: variable font sizes, constructions examples, placeholders for classes and methods, and auto-generated “See Also” links. Additionally it is missing some items found in standard Javadoc documentation, including: generics type information, “Deprecated” tags and comments, “See Also” links, along with other minor differences. Please send any questions or feedback to bam@cs.cmu.edu.
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Copyright 2008 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
The official Sun™ documentation can be found here at http://java.sun.com/javase/6/docs/api/.