Module java.base

Package java.nio.channels.spi

Class AsynchronousChannelProvider

java.lang.Object

java.nio.channels.spi.AsynchronousChannelProvider

public abstract class AsynchronousChannelProvider
extends Object

Service-provider class for asynchronous channels.

An asynchronous channel 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 provider method. The first invocation of that method will locate the default provider as specified below.

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

Since:

1.7

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AsynchronousChannelProvider()	Initializes a new instance of this class.

Method Summary

Modifier and Type	Method	Description
abstract AsynchronousChannelGroup	openAsynchronousChannelGroup(int nThreads, ThreadFactory threadFactory)	Constructs a new asynchronous channel group with a fixed thread pool.
abstract AsynchronousChannelGroup	openAsynchronousChannelGroup(ExecutorService executor, int initialSize)	Constructs a new asynchronous channel group with the given thread pool.
abstract AsynchronousServerSocketChannel	openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)	Opens an asynchronous server-socket channel.
abstract AsynchronousSocketChannel	openAsynchronousSocketChannel(AsynchronousChannelGroup group)	Opens an asynchronous socket channel.
static AsynchronousChannelProvider	provider()	Returns the system-wide default asynchronous channel provider for this invocation of the Java virtual machine.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AsynchronousChannelProvider

protected AsynchronousChannelProvider()

Initializes a new instance of this class.

Throws:

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

Method Details

provider

public static AsynchronousChannelProvider provider()

Returns the system-wide default asynchronous channel 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.AsynchronousChannelProvider 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.AsynchronousChannelProvider 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 AsynchronousChannel provider

openAsynchronousChannelGroup

public abstract AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory threadFactory) throws IOException

Constructs a new asynchronous channel group with a fixed thread pool.

Parameters:

nThreads - The number of threads in the pool

threadFactory - The factory to use when creating new threads

Returns:

A new asynchronous channel group

Throws:

IllegalArgumentException - If nThreads <= 0

IOException - If an I/O error occurs

See Also:

AsynchronousChannelGroup.withFixedThreadPool(int, java.util.concurrent.ThreadFactory)

openAsynchronousChannelGroup

public abstract AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize) throws IOException

Constructs a new asynchronous channel group with the given thread pool.

Parameters:

executor - The thread pool

initialSize - A value >=0 or a negative value for implementation specific default

Returns:

A new asynchronous channel group

Throws:

IOException - If an I/O error occurs

See Also:

AsynchronousChannelGroup.withCachedThreadPool(java.util.concurrent.ExecutorService, int)

openAsynchronousServerSocketChannel

public abstract AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group) throws IOException

Opens an asynchronous server-socket channel.

Parameters:

group - The group to which the channel is bound, or null to bind to the default group

Returns:

The new channel

Throws:

IllegalChannelGroupException - If the provider that created the group differs from this provider

ShutdownChannelGroupException - The group is shutdown

IOException - If an I/O error occurs

openAsynchronousSocketChannel

public abstract AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group) throws IOException

Opens an asynchronous socket channel.

Parameters:

group - The group to which the channel is bound, or null to bind to the default group

Returns:

The new channel

Throws:

IllegalChannelGroupException - If the provider that created the group differs from this provider

ShutdownChannelGroupException - The group is shutdown

IOException - If an I/O error occurs