Class NioReplicationTask

All Implemented Interfaces:

public class NioReplicationTask extends AbstractRxTask
A worker thread class which can drain channels and echo-back the input. Each instance is constructed with a reference to the owning thread pool object. When started, the thread loops forever waiting to be awakened to service the channel associated with a SelectionKey object. The worker is tasked by calling its serviceChannel() method with a SelectionKey object. The serviceChannel() method stores the key reference in the thread object then calls notify() to wake it up. When the channel has been drained, the worker thread returns itself to its parent pool.
  • Field Details

  • Constructor Details

  • Method Details

    • run

      public void run()
    • serviceChannel

      public void serviceChannel(SelectionKey key)
      Called to initiate a unit of work by this worker thread on the provided SelectionKey object. This method is synchronized, as is the run() method, so only one key can be serviced at a given time. Before waking the worker thread, and before returning to the main selection loop, this key's interest set is updated to remove OP_READ. This will cause the selector to ignore read-readiness for this channel while the worker thread is servicing it.
      key - The key to process
    • drainChannel

      protected void drainChannel(SelectionKey key, ObjectReader reader) throws Exception
      The actual code which drains the channel associated with the given key. This method assumes the key has been modified prior to invocation to turn off selection interest in OP_READ. When this method completes it re-enables OP_READ and calls wakeup() on the selector so the selector will resume watching this channel.
      key - The key to process
      reader - The reader
      Exception - IO error
    • registerForRead

      protected void registerForRead(SelectionKey key, ObjectReader reader)
    • sendAck

      protected void sendAck(SelectionKey key, WritableByteChannel channel, byte[] command, SocketAddress udpaddr)
      Send a reply-acknowledgement (6,2,3), sends it doing a busy write, the ACK is so small that it should always go to the buffer.
      key - The key to use
      channel - The channel
      command - The command to write
      udpaddr - Target address
    • setRxBufSize

      public void setRxBufSize(int rxBufSize)
    • getRxBufSize

      public int getRxBufSize()