Added in API level 26

AsynchronousChannelProvider

abstract class AsynchronousChannelProvider

kotlin.Any
↳	java.nio.channels.spi.AsynchronousChannelProvider

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.

Summary

Protected constructors
AsynchronousChannelProvider() Initializes a new instance of this class.

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

Protected constructors

AsynchronousChannelProvider

Added in API level 26

protected AsynchronousChannelProvider()

Initializes a new instance of this class.

Exceptions
java.lang.SecurityException	If a security manager has been installed and it denies RuntimePermission("asynchronousChannelProvider")

Public methods

openAsynchronousChannelGroup

Added in API level 26

abstract fun openAsynchronousChannelGroup(
    nThreads: Int, 
    threadFactory: ThreadFactory!
): AsynchronousChannelGroup!

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

Parameters
nThreads	Int: The number of threads in the pool
threadFactory	ThreadFactory!: The factory to use when creating new threads

Return
AsynchronousChannelGroup!	A new asynchronous channel group

Exceptions
java.lang.IllegalArgumentException	If nThreads <= 0
java.io.IOException	If an I/O error occurs

See Also

• java.nio.channels.AsynchronousChannelGroup#withFixedThreadPool

openAsynchronousChannelGroup

Added in API level 26

abstract fun openAsynchronousChannelGroup(
    executor: ExecutorService!, 
    initialSize: Int
): AsynchronousChannelGroup!

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

Parameters
executor	ExecutorService!: The thread pool
initialSize	Int: A value >=0 or a negative value for implementation specific default

Return
AsynchronousChannelGroup!	A new asynchronous channel group

Exceptions
java.io.IOException	If an I/O error occurs

See Also

• java.nio.channels.AsynchronousChannelGroup#withCachedThreadPool

openAsynchronousServerSocketChannel

Added in API level 26

abstract fun openAsynchronousServerSocketChannel(group: AsynchronousChannelGroup!): AsynchronousServerSocketChannel!

Opens an asynchronous server-socket channel.

Parameters
group	AsynchronousChannelGroup!: The group to which the channel is bound, or null to bind to the default group

Return
AsynchronousServerSocketChannel!	The new channel

Exceptions
java.nio.channels.IllegalChannelGroupException	If the provider that created the group differs from this provider
java.nio.channels.ShutdownChannelGroupException	The group is shutdown
java.io.IOException	If an I/O error occurs

openAsynchronousSocketChannel

Added in API level 26

abstract fun openAsynchronousSocketChannel(group: AsynchronousChannelGroup!): AsynchronousSocketChannel!

Opens an asynchronous socket channel.

Parameters
group	AsynchronousChannelGroup!: The group to which the channel is bound, or null to bind to the default group

Return
AsynchronousSocketChannel!	The new channel

Exceptions
java.nio.channels.IllegalChannelGroupException	If the provider that created the group differs from this provider
java.nio.channels.ShutdownChannelGroupException	The group is shutdown
java.io.IOException	If an I/O error occurs

provider

Added in API level 26

open static fun provider(): AsynchronousChannelProvider!

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.

Return
AsynchronousChannelProvider!	The system-wide default AsynchronousChannel provider