AsynchronousChannelProvider

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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.

Protected Constructor Summary

AsynchronousChannelProvider()
Initializes a new instance of this class.

Public Method Summary

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.

Inherited Method Summary

Protected Constructors

protected AsynchronousChannelProvider ()

Initializes a new instance of this class.

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

Public Methods

public abstract AsynchronousChannelGroup openAsynchronousChannelGroup (int nThreads, ThreadFactory threadFactory)

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

public abstract AsynchronousChannelGroup openAsynchronousChannelGroup (ExecutorService executor, int initialSize)

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

public abstract AsynchronousServerSocketChannel openAsynchronousServerSocketChannel (AsynchronousChannelGroup group)

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

public abstract AsynchronousSocketChannel openAsynchronousSocketChannel (AsynchronousChannelGroup group)

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

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