java.nio.channels.spi
Class SelectorProvider

java.lang.Object
  |
  +--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 provider instance, which is returned by the provider method. The first invocation of that method will locate the provider object as specified below.

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

Since:

1.4

Constructor Summary

protected

SelectorProvider() Initializes a new instance of this class.

Method Summary

abstract DatagramChannel	openDatagramChannel() Opens a datagram channel.
abstract Pipe	openPipe() Opens a pipe.
abstract AbstractSelector	openSelector() Opens a selector.
abstract ServerSocketChannel	openServerSocketChannel() Opens a server-socket channel.
abstract SocketChannel	openSocketChannel() Opens a socket channel.
static SelectorProvider	provider() Returns the selector provider for this invocation of the Java virtual machine.
static void	setProvider(SelectorProvider provider) Sets the system-wide selector provider.

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

setProvider

public static void setProvider(SelectorProvider provider)

Sets the system-wide selector provider.

Parameters:

provider - The provider to be used; must not be null

Throws:

IllegalStateException - If a provider for this invocation of the Java virtual machine has already been determined

SecurityException - If a security manager has been installed and it denies RuntimePermission("selectorProvider")

provider

public static SelectorProvider provider()

Returns the selector provider for this invocation of the Java virtual machine.

The first invocation of this method locates the system-wide provider object as follows:

1. If the setProvider method has been succesfully invoked then the supplied provider is returned.

2. If the system property java.nio.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.

3. 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.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.

4. 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 selector provider

openDatagramChannel

public abstract DatagramChannel openDatagramChannel()
                                             throws IOException

Opens a datagram channel.

Returns:

The new channel

IOException

openPipe

public abstract Pipe openPipe()
                       throws IOException

Opens a pipe.

Returns:

The new pipe

IOException

openSelector

public abstract AbstractSelector openSelector()
                                       throws IOException

Opens a selector.

Returns:

The new selector

IOException

openServerSocketChannel

public abstract ServerSocketChannel openServerSocketChannel()
                                                     throws IOException

Opens a server-socket channel.

Returns:

The new channel

IOException

openSocketChannel

public abstract SocketChannel openSocketChannel()
                                         throws IOException

Opens a socket channel.

Returns:

The new channel

IOException