Examples of org.apache.catalina.tribes.membership.Membership

Package org.apache.catalina.tribes.membership

Examples of org.apache.catalina.tribes.membership.Membership

org.apache.catalina.tribes.membership.Membership
A membership implementation using simple multicast. This is the representation of a multicast membership. This class is responsible for maintaining a list of active cluster nodes in the cluster. If a node fails to send out a heartbeat, the node will be dismissed. @author Filip Hanik @author Peter Rossbach @version $Id: Membership.java 939515 2010-04-29 23:59:49Z kkolinko $

        }
    }
    
    protected synchronized void setupMembership() {
        if ( membership == null ) {
            membership = new Membership((MemberImpl)super.getLocalMember(true));
        }
        
    }

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            MemberImpl local = (MemberImpl)getLocalMember(false);
            MemberImpl[] others = (MemberImpl[])membership.getMembers();
            fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_START_ELECT,this,"Election initated"));
            if ( others.length == 0 ) {
                this.viewId = new UniqueId(UUIDGenerator.randomUUID(false));
                this.view = new Membership(local,AbsoluteOrder.comp, true);
                this.handleViewConf(this.createElectionMsg(local,others,local),local,view);
                return; //the only member, no need for an election
            }
            if ( suggestedviewId != null ) {
                
                if ( view != null && Arrays.diff(view,suggestedView,local).length == 0 &&  Arrays.diff(suggestedView,view,local).length == 0) {
                    suggestedviewId = null;
                    suggestedView = null;
                    fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED,this,"Election abandoned, running election matches view"));
                } else {
                    fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED,this,"Election abandoned, election running"));
                }
                return; //election already running, I'm not allowed to have two of them
            }
            if ( view != null && Arrays.diff(view,membership,local).length == 0 &&  Arrays.diff(membership,view,local).length == 0) {
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_ELECT_ABANDONED,this,"Election abandoned, view matches membership"));
                return; //already have this view installed
            }            
            int prio = AbsoluteOrder.comp.compare(local,others[0]);
            MemberImpl leader = ( prio < 0 )?local:others[0];//am I the leader in my view?
            if ( local.equals(leader) || force ) {
                CoordinationMessage msg = createElectionMsg(local, others, leader);
                suggestedviewId = msg.getId();
                suggestedView = new Membership(local,AbsoluteOrder.comp,true);
                Arrays.fill(suggestedView,msg.getMembers());
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_PROCESS_ELECT,this,"Election, sending request"));
                sendElectionMsg(local,others[0],msg);
            } else {
                try {

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        }
    }


    private CoordinationMessage createElectionMsg(MemberImpl local, MemberImpl[] others, MemberImpl leader) {
        Membership m = new Membership(local,AbsoluteOrder.comp,true);
        Arrays.fill(m,others);
        MemberImpl[] mbrs = m.getMembers();
        m.reset(); 
        CoordinationMessage msg = new CoordinationMessage(leader, local, mbrs,new UniqueId(UUIDGenerator.randomUUID(true)), this.COORD_REQUEST);
        return msg;
    }

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    }
    
    protected Membership mergeOnArrive(CoordinationMessage msg, Member sender) {
        fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_PRE_MERGE,this,"Pre merge"));
        MemberImpl local = (MemberImpl)getLocalMember(false);
        Membership merged = new Membership(local,AbsoluteOrder.comp,true);
        Arrays.fill(merged,msg.getMembers());
        Arrays.fill(merged,getMembers());
        Member[] diff = Arrays.diff(merged,membership,local);
        for ( int i=0; i<diff.length; i++ ) {
            if (!alive(diff[i])) merged.removeMember((MemberImpl)diff[i]);
            else memberAdded(diff[i],false);
        }
        fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_POST_MERGE,this,"Post merge"));
        return merged;
    }

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        if ( !coordMsgReceived.get() ) {
            coordMsgReceived.set(true);
            synchronized (electionMutex) { electionMutex.notifyAll();}
        } 
        msg.timestamp = System.currentTimeMillis();
        Membership merged = mergeOnArrive(msg, sender);
        if (isViewConf(msg)) handleViewConf(msg, sender, merged);
        else handleToken(msg, sender, merged);
        ClassLoader loader;


    }

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                msg.type = COORD_CONF;
                super.sendMessage(Arrays.remove(msg.getMembers(),local),createData(msg,local),null);
                handleViewConf(msg,local,merged);
            } else {
                //membership change
                suggestedView = new Membership(local,AbsoluteOrder.comp,true);
                suggestedviewId = msg.getId();
                Arrays.fill(suggestedView,merged.getMembers());
                msg.view = (MemberImpl[])merged.getMembers();
                sendElectionMsgToNextInline(local,msg);
            }

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        }
    }
    
    protected void handleViewConf(CoordinationMessage msg, Member sender,Membership merged) throws ChannelException {
        if ( viewId != null && msg.getId().equals(viewId) ) return;//we already have this view
        view = new Membership((MemberImpl)getLocalMember(false),AbsoluteOrder.comp,true);
        Arrays.fill(view,msg.getMembers());
        viewId = msg.getId();
        
        if ( viewId.equals(suggestedviewId) ) {
            suggestedView = null;

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            if (membership == null) setupMembership();
            if (started)return;
            fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_START, this, "Before start"));
            super.start(startsvc);
            started = true;
            if (view == null) view = new Membership( (MemberImpl)super.getLocalMember(true), AbsoluteOrder.comp, true);
            fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_START, this, "After start"));
            startElection(false);
    }

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        return local;
    }
    
    protected synchronized void setupMembership() {
        if ( membership == null ) {
            membership  = new Membership((MemberImpl)super.getLocalMember(true),AbsoluteOrder.comp,false);
        }
    }

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        }
    }
    
    protected synchronized void setupMembership() {
        if ( membership == null ) {
            membership = new Membership((MemberImpl)super.getLocalMember(true));
        }
        
    }

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