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java.lang.Objectorg.classpath.icedtea.java.nio.channels.spi.AsynchronousChannelProvider
public abstract class 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.
Nested Class Summary | |
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static class |
AsynchronousChannelProvider.ThreadPoolType
The types of thread pool that an asynchronous channel group can be constructed with. |
Constructor Summary | |
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protected |
AsynchronousChannelProvider()
Initializes a new instance of this class. |
Method Summary | |
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AsynchronousChannelGroup |
openAsynchronousChannelGroup(AsynchronousChannelProvider.ThreadPoolType poolType,
ExecutorService executor,
int nThreads)
Constructs a new asynchronous channel group. |
abstract AsynchronousDatagramChannel |
openAsynchronousDatagramChannel(ProtocolFamily family,
AsynchronousChannelGroup group)
Opens an asynchronous datagram channel. |
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 inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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protected AsynchronousChannelProvider()
SecurityException
- If a security manager has been installed and it denies
RuntimePermission
("asynchronousChannelProvider")Method Detail |
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public static AsynchronousChannelProvider provider()
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 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.
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.
public AsynchronousChannelGroup openAsynchronousChannelGroup(AsynchronousChannelProvider.ThreadPoolType poolType, ExecutorService executor, int nThreads) throws IOException
poolType
- The type of thread poolexecutor
- The thread poolnThreads
- The number of threads or initial size, depending on the thread
pool type.
IllegalArgumentException
- If the nThreads
parameter is invalid for the thread
pool type
IOException
- If an I/O error occurspublic abstract AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group) throws IOException
group
- The group to which the channel is bound, or null
to
bind to the default group
IllegalChannelGroupException
- If the provider that created the group differs from this provider
ShutdownChannelGroupException
- The group is shutdown
IOException
- If an I/O error occurspublic abstract AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group) throws IOException
group
- The group to which the channel is bound, or null
to
bind to the default group
IllegalChannelGroupException
- If the provider that created the group differs from this provider
ShutdownChannelGroupException
- The group is shutdown
IOException
- If an I/O error occurspublic abstract AsynchronousDatagramChannel openAsynchronousDatagramChannel(ProtocolFamily family, AsynchronousChannelGroup group) throws IOException
family
- The protocol family, or null
for the default protocol
familygroup
- The group to which the channel is bound, or null
to
bind to the default group
IllegalChannelGroupException
- If the provider that created the group differs from this provider
ShutdownChannelGroupException
- The group is shutdown
IOException
- If an I/O error occurs
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