Examples of FC

org.jgroups.protocols.FC

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:

Receivers now send credits to a sender when more than min_credits have been received (rather than when min_credits are left)
Receivers don't send the full credits (max_credits), but rather tha actual number of bytes received

        View v=new View(a1, 1, members);
        s=new Simulator();
        s.setLocalAddress(a1);
        s.setView(v);
        s.addMember(a1);
        FC fc=new FC();
        fc.setMinCredits(1000);
        fc.setMaxCredits(10000);
        fc.setMaxBlockTime(1000);
        FRAG2 frag=new FRAG2();
        frag.setFragSize(8000);
        Protocol[] stack=new Protocol[]{frag, fc};
        s.setProtocolStack(stack);
        s.start();

        v=new View(a1, 1, members);
        s=new Simulator();
        s.setLocalAddress(a1);
        s.setView(v);
        s.addMember(a1);
        FC fc=new FC();
        Properties props=new Properties();
        props.setProperty("max_credits", "10000");
        props.setProperty("min_credits", "1000");
        props.setProperty("max_block_time", "1000");
        fc.setProperties(props);
        Protocol[] stack=new Protocol[]{fc};
        s.setProtocolStack(stack);
        s.start();
    }

        v=new View(a1, 1, members);
        s=new Simulator();
        s.setLocalAddress(a1);
        s.setView(v);
        s.addMember(a1);
        FC fc=new FC();
        Properties props=new Properties();
        props.setProperty("max_credits", "10000");
        props.setProperty("min_credits", "1000");
        props.setProperty("max_block_time", "1000");
        fc.setProperties(props);
        Protocol[] stack=new Protocol[]{fc};
        s.setProtocolStack(stack);
        s.start();
    }

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Examples of FC

Examples of org.jgroups.protocols.FC

Examples of org.jgroups.protocols.FC

Examples of org.jgroups.protocols.FC