Package org.jgroups.util

Examples of org.jgroups.util.Digest


                                                                             bind_addr, bind_port));
            Thread t = getThreadFactory().newThread(spawner, "STREAMING_STATE_TRANSFER server socket acceptor");
            t.start();
        }

        Digest digest = isDigestNeeded() ? (Digest) down_prot.down(Event.GET_DIGEST_EVT) : null;

        Message state_rsp = new Message(stateRequester);
        StateHeader hdr = new StateHeader(StateHeader.STATE_RSP, local_addr, use_default_transport
                ? null
                : spawner.getServerSocketAddress(), digest, id);
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                down_prot.down(new Event(Event.OPEN_BARRIER));
        }
    }

    void handleStateRsp(final StateHeader hdr) {
        Digest tmp_digest = hdr.my_digest;
        if (isDigestNeeded()) {
            if (tmp_digest == null) {
                if (log.isWarnEnabled())
                    log.warn("digest received from " + hdr.sender
                            + " is null, skipping setting digest !");
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    }



    void becomeSingletonMember(Address mbr) {
        Digest initial_digest;
        ViewId view_id;
        Vector<Address> mbrs=new Vector<Address>(1);

        // set the initial digest (since I'm the first member)
        initial_digest=new Digest(gms.local_addr, 0, 0); // initial seqno mcast by me will be 1 (highest seen +1)
        gms.setDigest(initial_digest);

        view_id=new ViewId(mbr);       // create singleton view with mbr as only member
        mbrs.addElement(mbr);
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            // Example: {A}, B joins, after returning JoinRsp to B, A garbage collects messages higher than those
            // in the digest returned to the client, so the client will *not* be able to ask for retransmission
            // of those messages if he misses them           
            if(hasJoiningMembers) {
                gms.getDownProtocol().down(new Event(Event.SUSPEND_STABLE, MAX_SUSPEND_TIMEOUT));
                Digest tmp=gms.getDigest(); // get existing digest
                MutableDigest join_digest=null;
                if(tmp == null){
                    log.error("received null digest from GET_DIGEST: will cause JOIN to fail");
                }
                else {
                    // create a new digest, which contains the new member
                    join_digest=new MutableDigest(tmp.size() + new_mbrs.size());
                    join_digest.add(tmp); // add the existing digest to the new one
                    for(Address member:new_mbrs)
                        join_digest.add(member, 0, 0); // ... and add the new members. their first seqno will be 1
                }
                join_rsp=new JoinRsp(new_view, join_digest != null? join_digest.copy() : null);
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    private static String dumpDigests(JChannel ... channels) {
        StringBuilder sb=new StringBuilder();
        for(JChannel ch: channels) {
            sb.append(ch.getAddress()).append(": ");
            NAKACK nakack=(NAKACK)ch.getProtocolStack().findProtocol(NAKACK.class);
            Digest digest=nakack.getDigest();
            sb.append(digest).append("\n");
        }
        return sb.toString();
    }
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            finally {
                received.unlock();
            }

            if(send_stable_msg) {
                Digest my_digest=getDigest()// asks the NAKACK protocol for the current digest,
                if(log.isTraceEnabled())
                    log.trace("setting latest_local_digest from NAKACK: " + my_digest.printHighestDeliveredSeqnos());
                sendStableMessage(my_digest);
            }
        }
    }
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    }


    @ManagedOperation
    public void runMessageGarbageCollection() {
        Digest copy=getDigest();
        sendStableMessage(copy);
    }
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    }


    @GuardedBy("lock")
    private void resetDigest() {
        Digest tmp=getDigest();
        digest.replace(tmp);
        if(log.isTraceEnabled())
            log.trace(local_addr + ": resetting digest from NAKACK: " + digest.printHighestDeliveredSeqnos());
        votes.clear();
    }
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            if(log.isTraceEnabled())
                log.trace("STABLE message will not be handled as I'm suspended");
            return;
        }

        Digest copy=null;
        lock.lock();
        try {
            if(votes.contains(sender))  // already received gossip from sender; discard it
                return;
            num_stable_msgs_received++;
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                    log.trace("stable task will not run as suspended=" + suspended);
                return;
            }

            // asks the NAKACK protocol for the current digest
            Digest my_digest=getDigest();
            if(my_digest == null) {
                if(log.isWarnEnabled())
                    log.warn("received null digest, skipped sending of stable message");
                return;
            }
            if(log.isTraceEnabled())
                log.trace(local_addr + ": setting latest_local_digest from NAKACK: " + my_digest.printHighestDeliveredSeqnos());
            sendStableMessage(my_digest);
        }
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