- java.lang.Object
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- java.nio.channels.spi.SelectorProvider
 
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 public abstract class SelectorProvider extends Object 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 providermethod. The first invocation of that method will locate the default provider as specified below.The system-wide default provider is used by the static openmethods of theDatagramChannel,Pipe,Selector,ServerSocketChannel, andSocketChannelclasses. It is also used by theSystem.inheritedChannel()method. A program may make use of a provider other than the default provider by instantiating that provider and then directly invoking theopenmethods defined in this class.All of the methods in this class are safe for use by multiple concurrent threads. - Since:
- 1.4
 
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Constructor SummaryConstructors Modifier Constructor Description protectedSelectorProvider()Initializes a new instance of this class.
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Method SummaryAll Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description ChannelinheritedChannel()Returns the channel inherited from the entity that created this Java virtual machine.abstract DatagramChannelopenDatagramChannel()Opens a datagram channel.abstract DatagramChannelopenDatagramChannel(ProtocolFamily family)Opens a datagram channel.abstract PipeopenPipe()Opens a pipe.abstract AbstractSelectoropenSelector()Opens a selector.abstract ServerSocketChannelopenServerSocketChannel()Opens a server-socket channel.abstract SocketChannelopenSocketChannel()Opens a socket channel.static SelectorProviderprovider()Returns the system-wide default selector provider for this invocation of the Java virtual machine.
 
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Constructor Detail- 
SelectorProviderprotected SelectorProvider() Initializes a new instance of this class.- Throws:
- SecurityException- If a security manager has been installed and it denies- RuntimePermission- ("selectorProvider")
 
 
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Method Detail- 
providerpublic static SelectorProvider provider() Returns the system-wide default selector 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.SelectorProvideris 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.SelectorProviderin 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. - Returns:
- The system-wide default selector provider
 
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openDatagramChannelpublic abstract DatagramChannel openDatagramChannel() throws IOException Opens a datagram channel.- Returns:
- The new channel
- Throws:
- IOException- If an I/O error occurs
 
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openDatagramChannelpublic abstract DatagramChannel openDatagramChannel(ProtocolFamily family) throws IOException Opens a datagram channel.- Parameters:
- family- The protocol family
- Returns:
- A new datagram channel
- Throws:
- UnsupportedOperationException- If the specified protocol family is not supported
- IOException- If an I/O error occurs
- Since:
- 1.7
 
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openPipepublic abstract Pipe openPipe() throws IOException Opens a pipe.- Returns:
- The new pipe
- Throws:
- IOException- If an I/O error occurs
 
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openSelectorpublic abstract AbstractSelector openSelector() throws IOException Opens a selector.- Returns:
- The new selector
- Throws:
- IOException- If an I/O error occurs
 
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openServerSocketChannelpublic abstract ServerSocketChannel openServerSocketChannel() throws IOException Opens a server-socket channel.- Returns:
- The new channel
- Throws:
- IOException- If an I/O error occurs
 
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openSocketChannelpublic abstract SocketChannel openSocketChannel() throws IOException Opens a socket channel.- Returns:
- The new channel
- Throws:
- IOException- If an I/O error occurs
 
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inheritedChannelpublic Channel inheritedChannel() throws IOException Returns the channel inherited from the entity that created this Java virtual machine.On many operating systems a process, such as a Java virtual machine, can be started in a manner that allows the process to inherit a channel from the entity that created the process. The manner in which this is done is system dependent, as are the possible entities to which the channel may be connected. For example, on UNIX systems, the Internet services daemon (inetd) is used to start programs to service requests when a request arrives on an associated network port. In this example, the process that is started, inherits a channel representing a network socket. In cases where the inherited channel represents a network socket then the Channeltype returned by this method is determined as follows:- If the inherited channel represents a stream-oriented connected socket then a - SocketChannelis returned. The socket channel is, at least initially, in blocking mode, bound to a socket address, and connected to a peer.
- If the inherited channel represents a stream-oriented listening socket then a - ServerSocketChannelis returned. The server-socket channel is, at least initially, in blocking mode, and bound to a socket address.
- If the inherited channel is a datagram-oriented socket then a - DatagramChannelis returned. The datagram channel is, at least initially, in blocking mode, and bound to a socket address.
 In addition to the network-oriented channels described, this method may return other kinds of channels in the future. The first invocation of this method creates the channel that is returned. Subsequent invocations of this method return the same channel. - Returns:
- The inherited channel, if any, otherwise null.
- Throws:
- IOException- If an I/O error occurs
- SecurityException- If a security manager has been installed and it denies- RuntimePermission- ("inheritedChannel")
- Since:
- 1.5
 
 
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