Package org.jgroups.protocols

Class DELAY

java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.DELAY
All Implemented Interfaces:
Lifecycle
public class DELAY extends Protocol
Delays incoming/outgoing messages by a random number of milliseconds (range between 0 and n where n is determined by the user) and nanoseconds (constant amount).

Incoming messages can be delayed independently from outgoing messages (or not delayed at all).

This protocol should be inserted directly above the transport protocol (e.g. UDP).

  • Field Details

    • randomNumberGenerator

      private static final Random randomNumberGenerator

    • in_delay

      protected int in_delay

    • out_delay

      protected int out_delay

    • in_delay_nanos

      protected int in_delay_nanos

    • out_delay_nanos

      protected int out_delay_nanos

    • constant_delay

      protected boolean constant_delay

    • delayed_message_handler

      protected DELAY.DelayedMessageHandler delayed_message_handler

    • delayed_messages

      protected DelayQueue<DELAY.DelayedMessage> delayed_messages

  • Constructor Details

    • DELAY

      public DELAY()

  • Method Details

    • getInDelay

      public int getInDelay()

    • setInDelay

      public void setInDelay(int in_delay)

    • getOutDelay

      public int getOutDelay()

    • setOutDelay

      public void setOutDelay(int out_delay)

    • getInDelayNanos

      public int getInDelayNanos()

    • setInDelayNanos

      public void setInDelayNanos(int in_delay_nanos)

    • getOutDelayNanos

      public int getOutDelayNanos()

    • setOutDelayNanos

      public void setOutDelayNanos(int out_delay_nanos)

    • init

      public void init() throws Exception
      Description copied from class: Protocol
      Called after a protocol has been created and before the protocol is started. Attributes are already set. Other protocols are not yet connected and events cannot yet be sent.
      Specified by:
      init in interface Lifecycle
      Overrides:
      init in class Protocol
      Throws:
      Exception - Thrown if protocol cannot be initialized successfully. This will cause the ProtocolStack to fail, so the the channel constructor will throw an exception

    • destroy

      public void destroy()
      Description copied from class: Protocol
      This method is called on a JChannel.close(). Does some cleanup; after the call, the VM will terminate
      Specified by:
      destroy in interface Lifecycle
      Overrides:
      destroy in class Protocol

    • down

      public Object down(Message msg)
      Description copied from class: Protocol
      A message is sent down the stack. Protocols may examine the message and do something (e.g. add a header) with it, before passing it down.
      Overrides:
      down in class Protocol

    • up

      public Object up(Message msg)
      Description copied from class: Protocol
      A single message was received. Protocols may examine the message and do something (e.g. add a header) with it before passing it up.
      Overrides:
      up in class Protocol

    • up

      public void up(MessageBatch batch)
      Description copied from class: Protocol
      Sends up a multiple messages in a MessageBatch. The sender of the batch is always the same, and so is the destination (null == multicast messages). Messages in a batch can be OOB messages, regular messages, or mixed messages, although the transport itself will create initial MessageBatches that contain only either OOB or regular messages.

      The default processing below sends messages up the stack individually, based on a matching criteria (calling Protocol.accept(Message)), and - if true - calls Protocol.up(org.jgroups.Event) for that message and removes the message. If the batch is not empty, it is passed up, or else it is dropped.

      Subclasses should check if there are any messages destined for them (e.g. using MessageBatch.iterator(Predicate)), then possibly remove and process them and finally pass the batch up to the next protocol. Protocols can also modify messages in place, e.g. ENCRYPT could decrypt all encrypted messages in the batch, not remove them, and pass the batch up when done.

      Overrides:
      up in class Protocol
      Parameters:
      batch - The message batch

    • computeDelay

      private int computeDelay(int n)
      Compute a random number between 0 and n

    • sleep

      private void sleep(int variable_milliseconds_delay, int nano_delay)