Class AUTOCONF

java.lang.Object
org.jgroups.stack.Protocol
org.jgroups.protocols.AUTOCONF

public class AUTOCONF extends Protocol
Senses the network configuration when it is initialized (in init()) and sends a CONFIG event up and down the stack. The CONFIG event contains a hashmap, with strings as keys (e.g. "frag_size") and Objects as values. Certain protocols can set some of their properties when receiving the CONFIG event.

This protocol should be placed above the transport protocol (e.g. UDP). It is not needed for TCP.

Example: senses the network send and receive buffers, plus the max size of a message to be sent and generates a CONFIG event containing "frag_size", "send_buf_size" and "receive_buf_size" keys.

Author:
Bela Ban
  • Constructor Details

    • AUTOCONF

      public AUTOCONF()
  • Method Details

    • getName

      public String getName()
      Specified by:
      getName in class Protocol
    • init

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

      public void start() throws Exception
      Description copied from class: Protocol
      This method is called on a Channel.connect(String). Starts work. Protocols are connected and queues are ready to receive events. Will be called from bottom to top. This call will replace the START and START_OK events.
      Overrides:
      start in class Protocol
      Throws:
      Exception - Thrown if protocol cannot be started successfully. This will cause the ProtocolStack to fail, so Channel.connect(String) will throw an exception
    • setProperties

      public boolean setProperties(Properties props)
      Setup the Protocol instance acording to the configuration string
      Overrides:
      setProperties in class Protocol
    • senseMaxFragSizeStatic

      public static int senseMaxFragSizeStatic()
    • senseMaxFragSize

      public int senseMaxFragSize()
      Tries to find out the max number of bytes in a DatagramPacket we can send by sending increasingly larger packets, until there is an exception (e.g., java.io.IOException: message too long).
    • main

      public static void main(String[] args)