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java.lang.Objectjava.nio.channels.spi.SelectorProvider
org.classpath.icedtea.java.nio.channels.spi.SelectorProvider
public abstract class SelectorProvider
Service-provider class for selectors and selectable channels.
A selector 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.
The system-wide default provider is used by the static open
methods of the DatagramChannel
, Pipe
, Selector
, ServerSocketChannel
, and SocketChannel
classes. It is also
used by the System.inheritedChannel()
method. A program may make use of a provider other than the default provider
by instantiating that provider and then directly invoking the open
methods defined in this class.
All of the methods in this class are safe for use by multiple concurrent threads.
Constructor Summary | |
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SelectorProvider()
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Method Summary | |
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abstract DatagramChannel |
openDatagramChannel()
Opens a datagram channel. |
abstract DatagramChannel |
openDatagramChannel(ProtocolFamily family)
Opens a datagram channel. |
static SelectorProvider |
provider()
Returns the system-wide default selector provider for this invocation of the Java virtual machine. |
Methods inherited from class java.nio.channels.spi.SelectorProvider |
---|
inheritedChannel, openPipe, openSelector, openServerSocketChannel, openSocketChannel |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SelectorProvider()
Method Detail |
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public abstract DatagramChannel openDatagramChannel() throws IOException
openDatagramChannel
in class SelectorProvider
IOException
public abstract DatagramChannel openDatagramChannel(ProtocolFamily family) throws IOException
family
- The protocol family
UnsupportedOperationException
- If the specified protocol family is not supported
IOException
- If an I/O error occurspublic static SelectorProvider provider()
The first invocation of this method locates the default provider object as follows:
If the system property java.nio.channels.spi.SelectorProvider 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.SelectorProvider 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.
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