public abstract class AsynchronousChannelProvider extends Object
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
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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.
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Constructor Details
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AsynchronousChannelProvider
protected AsynchronousChannelProvider()Initializes a new instance of this class.- Throws:
SecurityException
- If a security manager has been installed and it deniesRuntimePermission
("asynchronousChannelProvider")
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Method Details
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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:
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.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 directoryMETA-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.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
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openAsynchronousChannelGroup
public abstract AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory threadFactory) throws IOExceptionConstructs a new asynchronous channel group with a fixed thread pool.- Parameters:
nThreads
- The number of threads in the poolthreadFactory
- The factory to use when creating new threads- Returns:
- A new asynchronous channel group
- Throws:
IllegalArgumentException
- IfnThreads <= 0
IOException
- If an I/O error occurs- See Also:
AsynchronousChannelGroup.withFixedThreadPool(int, java.util.concurrent.ThreadFactory)
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openAsynchronousChannelGroup
public abstract AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize) throws IOExceptionConstructs a new asynchronous channel group with the given thread pool.- Parameters:
executor
- The thread poolinitialSize
- 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)
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openAsynchronousServerSocketChannel
public abstract AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group) throws IOExceptionOpens an asynchronous server-socket channel.- Parameters:
group
- The group to which the channel is bound, ornull
to bind to the default group- Returns:
- The new channel
- Throws:
IllegalChannelGroupException
- If the provider that created the group differs from this providerShutdownChannelGroupException
- The group is shutdownIOException
- If an I/O error occurs
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openAsynchronousSocketChannel
public abstract AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group) throws IOExceptionOpens an asynchronous socket channel.- Parameters:
group
- The group to which the channel is bound, ornull
to bind to the default group- Returns:
- The new channel
- Throws:
IllegalChannelGroupException
- If the provider that created the group differs from this providerShutdownChannelGroupException
- The group is shutdownIOException
- If an I/O error occurs
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