Examples of org.jgroups.protocols.UFC

org.jgroups.protocols.UFC
Simple flow control protocol based on a credit system. Each sender has a number of credits (bytes to send). When the credits have been exhausted, the sender blocks. Each receiver also keeps track of how many credits it has received from a sender. When credits for a sender fall below a threshold, the receiver sends more credits to the sender. Works for both unicast and multicast messages.
Note that this protocol must be located towards the top of the stack, or all down_threads from JChannel to this protocol must be set to false ! This is in order to block JChannel.send()/JChannel.down().
This is the second simplified implementation of the same model. The algorithm is sketched out in doc/FlowControl.txt
Changes (Brian) April 2006:
1. Receivers now send credits to a sender when more than min_credits have been received (rather than when min_credits are left)
2. Receivers don't send the full credits (max_credits), but rather the actual number of bytes received

        .addProtocol(new FD_SOCK())
        .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
        .addProtocol(new VERIFY_SUSPECT()).addProtocol(new BARRIER())
        .addProtocol(new NAKACK()).addProtocol(new UNICAST2())
        .addProtocol(new STABLE()).addProtocol(new GMS())
        .addProtocol(new UFC()).addProtocol(new MFC())
        .addProtocol(new FRAG2());
    stack.init();
    
    channel.setReceiver(new ReceiverAdapter(){

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        .addProtocol(new FD_SOCK())
        .addProtocol(new FD_ALL().setValue("timeout", 12000).setValue("interval", 3000))
        .addProtocol(new VERIFY_SUSPECT()).addProtocol(new BARRIER())
        .addProtocol(new NAKACK()).addProtocol(new UNICAST2())
        .addProtocol(new STABLE()).addProtocol(new GMS())
        .addProtocol(new UFC()).addProtocol(new MFC())
        .addProtocol(new FRAG2());
    stack.init();
    
    
  }

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                        break;
                    }
                    System.out.println(mfc.printCredits());
                    break;
                case '5':
                    UFC ufc=(UFC)ch.getProtocolStack().findProtocol(UFC.class);
                    if(ufc == null) {
                        System.err.println("UFC not found");
                        break;
                    }
                    System.out.println(ufc.printCredits());
                    break;
                case 'q': case 'Q': case 'x':
                    return;
            }
        }

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                        break;
                    }
                    System.out.println(mfc.printCredits());
                    break;
                case '5':
                    UFC ufc=(UFC)ch.getProtocolStack().findProtocol(UFC.class);
                    if(ufc == null) {
                        System.err.println("UFC not found");
                        break;
                    }
                    System.out.println(ufc.printCredits());
                    break;
                case 'q': case 'Q': case 'x':
                    return;
            }
        }

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Related Classes of org.jgroups.protocols.UFC

com.kylin.jgroups.demo.ProgrammaticChat

com.kylin.jgroups.test.JChannelTest

org.jgroups.Address

org.jgroups.tests.FlowControlTest

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