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()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    String
    toString()
    Returns a string representation of the object.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  • 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