Class Channels

java.lang.Object
jdk.nio.Channels
public final class Channels extends Object
Defines static methods to create channels.

Unless otherwise specified, passing a null argument to any of the methods defined here will cause a NullPointerException to be thrown.

Since:
11

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    static interface 
    Channels.SelectableChannelCloser
    An object used to coordinate the closing of a selectable channel created by readWriteSelectableChannel.

  • Method Summary

    Modifier and Type
    Method
    Description
    static SelectableChannel
    readWriteSelectableChannel(FileDescriptor fd, Channels.SelectableChannelCloser closer)
    Creates a selectable channel to a file descriptor that supports an operation-set of OP_READ and OP_WRITE.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • Method Details

    • readWriteSelectableChannel

      public static SelectableChannel readWriteSelectableChannel(FileDescriptor fd, Channels.SelectableChannelCloser closer)
      Creates a selectable channel to a file descriptor that supports an operation-set of OP_READ and OP_WRITE. The selectable channel will be created by the default SelectorProvider.

      The given file descriptor is a socket or resource that can be multiplexed by a Selector for read and write readiness. Great care is required to coordinate direct use of the file descriptor with the use of the selectable channel. In particular, changing the blocking mode or closing the file descriptor without careful coordination will result in unspecified and unsafe side effects. The given SelectableChannelCloser is invoked to close the file descriptor and to coordinate the closing when the channel is registered with a Selector.

      Implementation Note:
      This method throws UnsupportedOperationException if the default SelectorProvider is not the JDK built-in implementation.
      Parameters:
      fd - The file descriptor
      closer - The object to close the channel
      Returns:
      The selectable channel
      Throws:
      IllegalArgumentException - If the file descriptor is not valid