Java compact1, compact2, compact3 java.nio.channels.spi Class SelectorProvider（JDK8）

Constructor Detail

• SelectorProvider

  protected SelectorProvider()

  Initializes a new instance of this class.

  Throws:

  SecurityException - If a security manager has been installed and it denies RuntimePermission("selectorProvider")

Method Detail

• provider

  public 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:

  1. 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.

  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.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.

  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 selector provider

• openDatagramChannel

  public abstract DatagramChannel openDatagramChannel()
                                               throws IOException

  Opens a datagram channel.

  Returns:

  The new channel

  Throws:

  IOException - If an I/O error occurs

• openDatagramChannel

  public 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

• openPipe

  public abstract Pipe openPipe()
                         throws IOException

  Opens a pipe.

  Returns:

  The new pipe

  Throws:

  IOException - If an I/O error occurs

• openSelector

  public abstract AbstractSelector openSelector()
                                         throws IOException

  Opens a selector.

  Returns:

  The new selector

  Throws:

  IOException - If an I/O error occurs

• openServerSocketChannel

  public abstract ServerSocketChannel openServerSocketChannel()
                                                       throws IOException

  Opens a server-socket channel.

  Returns:

  The new channel

  Throws:

  IOException - If an I/O error occurs

• openSocketChannel

  public abstract SocketChannel openSocketChannel()
                                           throws IOException

  Opens a socket channel.

  Returns:

  The new channel

  Throws:

  IOException - If an I/O error occurs

• inheritedChannel

  public 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 Channel type returned by this method is determined as follows:

  • If the inherited channel represents a stream-oriented connected socket then a SocketChannel is 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 ServerSocketChannel is 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 DatagramChannel is 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