org.apache.catalina.tribes.membership.MemberImpl Java Examples

protected void performForcedCheck() {
    //update all alive times
    Member[] members = super.getMembers();
    for (int i = 0; members != null && i < members.length; i++) {
        if (memberAlive(members[i])) {
            if (membership.memberAlive((MemberImpl)members[i])) super.memberAdded(members[i]);
            addSuspects.remove(members[i]);
        } else {
            if (membership.getMember(members[i])!=null) {
                membership.removeMember((MemberImpl)members[i]);
                removeSuspects.remove(members[i]);
                if (members[i] instanceof StaticMember) {
                    addSuspects.put(members[i], Long.valueOf(System.currentTimeMillis()));
                }
                super.memberDisappeared(members[i]);
            }
        } //end if
    } //for

}
 

@Override
public void memberDisappeared(Member member) {
    try {
        
        membership.removeMember((MemberImpl)member);
        super.memberDisappeared(member);
        try {
            fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_MBR_DEL,this,"Member remove("+member.getName()+")"));
            if ( started && (isCoordinator() || isHighest()) ) 
                startElection(true); //to do, if a member disappears, only the coordinator can start
        }catch ( ChannelException x ) {
            log.error("Unable to start election when member was removed.",x);
        }
    }finally {
    }
}
 

@Override
public void heartbeat() {
    try {
        MemberImpl local = (MemberImpl)getLocalMember(false);
        if ( view != null && (Arrays.diff(view,membership,local).length != 0 ||  Arrays.diff(membership,view,local).length != 0) ) {
            if ( isHighest() ) {
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_START_ELECT, this,
                                                           "Heartbeat found inconsistency, restart election"));
                startElection(true);
            }            
        }
    } catch ( Exception x  ){
        log.error("Unable to perform heartbeat.",x);
    } finally {
        super.heartbeat();
    }
}
 

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;
        suggestedviewId = null;
    }
    
    if (suggestedView != null && AbsoluteOrder.comp.compare(suggestedView.getMembers()[0],merged.getMembers()[0])<0 ) {
        suggestedView = null;
        suggestedviewId = null;
    }
    
    viewChange(viewId,view.getMembers());
    fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_CONF_RX,this,"Accepted View"));
    
    if ( suggestedviewId == null && hasHigherPriority(merged.getMembers(),membership.getMembers()) ) {
        startElection(false);
    }
}
 

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;
        suggestedviewId = null;
    }
    
    if (suggestedView != null && AbsoluteOrder.comp.compare(suggestedView.getMembers()[0],merged.getMembers()[0])<0 ) {
        suggestedView = null;
        suggestedviewId = null;
    }
    
    viewChange(viewId,view.getMembers());
    fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_CONF_RX,this,"Accepted View"));
    
    if ( suggestedviewId == null && hasHigherPriority(merged.getMembers(),membership.getMembers()) ) {
        startElection(false);
    }
}
 

protected void handleMyToken(MemberImpl local, CoordinationMessage msg, Member sender,Membership merged) throws ChannelException {
    if ( local.equals(msg.getLeader()) ) {
        //no leadership change
        if ( Arrays.sameMembers(msg.getMembers(),merged.getMembers()) ) {
            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 = merged.getMembers();
            sendElectionMsgToNextInline(local,msg);
        }
    } else {
        //leadership change
        suggestedView = null;
        suggestedviewId = null;
        msg.view = merged.getMembers();
        sendElectionMsgToNextInline(local,msg);
    }
}
 

protected void handleMyToken(MemberImpl local, CoordinationMessage msg, Member sender,Membership merged) throws ChannelException {
    if ( local.equals(msg.getLeader()) ) {
        //no leadership change
        if ( Arrays.sameMembers(msg.getMembers(),merged.getMembers()) ) {
            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 = merged.getMembers();
            sendElectionMsgToNextInline(local,msg);
        }
    } else {
        //leadership change
        suggestedView = null;
        suggestedviewId = null;
        msg.view = merged.getMembers();
        sendElectionMsgToNextInline(local,msg);
    }
}
 

@Override
public void memberDisappeared(Member member) {
    try {
        
        membership.removeMember((MemberImpl)member);
        super.memberDisappeared(member);
        try {
            fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_MBR_DEL,this,"Member remove("+member.getName()+")"));
            if ( started && (isCoordinator() || isHighest()) ) 
                startElection(true); //to do, if a member disappears, only the coordinator can start
        }catch ( ChannelException x ) {
            log.error("Unable to start election when member was removed.",x);
        }
    }finally {
    }
}
 

@Override
public void heartbeat() {
    try {
        MemberImpl local = (MemberImpl)getLocalMember(false);
        if ( view != null && (Arrays.diff(view,membership,local).length != 0 ||  Arrays.diff(membership,view,local).length != 0) ) {
            if ( isHighest() ) {
                fireInterceptorEvent(new CoordinationEvent(CoordinationEvent.EVT_START_ELECT, this,
                                                           "Heartbeat found inconsistency, restart election"));
                startElection(true);
            }            
        }
    } catch ( Exception x  ){
        log.error("Unable to perform heartbeat.",x);
    } finally {
        super.heartbeat();
    }
}
 

protected void sendElectionMsgToNextInline(MemberImpl local, CoordinationMessage msg) throws ChannelException { 
    int next = Arrays.nextIndex(local,msg.getMembers());
    int current = next;
    msg.leader = msg.getMembers()[0];
    boolean sent =  false;
    while ( !sent && current >= 0 ) {
        try {
            sendElectionMsg(local, msg.getMembers()[current], msg);
            sent = true;
        }catch ( ChannelException x  ) {
            log.warn("Unable to send election message to:"+msg.getMembers()[current]);
            current = Arrays.nextIndex(msg.getMembers()[current],msg.getMembers());
            if ( current == next ) throw x;
        }
    }
}
 

protected void sendElectionMsgToNextInline(MemberImpl local, CoordinationMessage msg) throws ChannelException { 
    int next = Arrays.nextIndex(local,msg.getMembers());
    int current = next;
    msg.leader = msg.getMembers()[0];
    boolean sent =  false;
    while ( !sent && current >= 0 ) {
        try {
            sendElectionMsg(local, msg.getMembers()[current], msg);
            sent = true;
        }catch ( ChannelException x  ) {
            log.warn("Unable to send election message to:"+msg.getMembers()[current]);
            current = Arrays.nextIndex(msg.getMembers()[current],msg.getMembers());
            if ( current == next ) throw x;
        }
    }
}
 

protected void performForcedCheck() {
    //update all alive times
    Member[] members = super.getMembers();
    for (int i = 0; members != null && i < members.length; i++) {
        if (memberAlive(members[i])) {
            if (membership.memberAlive((MemberImpl)members[i])) super.memberAdded(members[i]);
            addSuspects.remove(members[i]);
        } else {
            if (membership.getMember(members[i])!=null) {
                membership.removeMember((MemberImpl)members[i]);
                removeSuspects.remove(members[i]);
                if (members[i] instanceof StaticMember) {
                    addSuspects.put(members[i], Long.valueOf(System.currentTimeMillis()));
                }
                super.memberDisappeared(members[i]);
            }
        } //end if
    } //for

}
 

@Override
public void memberAdded(Member member) {
    if ( membership == null ) setupMembership();
    boolean notify = false;
    synchronized (membership) {
        if (removeSuspects.containsKey(member)) {
            //previously marked suspect, system below picked up the member again
            removeSuspects.remove(member);
        } else if (membership.getMember(member) == null){
            //if we add it here, then add it upwards too
            //check to see if it is alive
            if (memberAlive(member)) {
                membership.memberAlive( (MemberImpl) member);
                notify = true;
            } else {
                addSuspects.put(member, Long.valueOf(System.currentTimeMillis()));
            }
        }
    }
    if ( notify ) super.memberAdded(member);
}
 

@Override
public void memberAdded(Member member) {
    if ( membership == null ) setupMembership();
    boolean notify = false;
    synchronized (membership) {
        if (removeSuspects.containsKey(member)) {
            //previously marked suspect, system below picked up the member again
            removeSuspects.remove(member);
        } else if (membership.getMember(member) == null){
            //if we add it here, then add it upwards too
            //check to see if it is alive
            if (memberAlive(member)) {
                membership.memberAlive( (MemberImpl) member);
                notify = true;
            } else {
                addSuspects.put(member, Long.valueOf(System.currentTimeMillis()));
            }
        }
    }
    if ( notify ) super.memberAdded(member);
}
 

public byte[] getDataPackage(byte[] data, int offset)  {
    byte[] addr = ((MemberImpl)address).getData(false);
    XByteBuffer.toBytes(options,data,offset);
    offset += 4; //options
    XByteBuffer.toBytes(timestamp,data,offset);
    offset += 8; //timestamp
    XByteBuffer.toBytes(uniqueId.length,data,offset);
    offset += 4; //uniqueId.length
    System.arraycopy(uniqueId,0,data,offset,uniqueId.length);
    offset += uniqueId.length; //uniqueId data
    XByteBuffer.toBytes(addr.length,data,offset);
    offset += 4; //addr.length
    System.arraycopy(addr,0,data,offset,addr.length);
    offset += addr.length; //addr data
    XByteBuffer.toBytes(message.getLength(),data,offset);
    offset += 4; //message.length
    System.arraycopy(message.getBytesDirect(),0,data,offset,message.getLength());
    offset += message.getLength(); //message data
    return data;
}
 

public byte[] getDataPackage(byte[] data, int offset)  {
    byte[] addr = ((MemberImpl)address).getData(false);
    XByteBuffer.toBytes(options,data,offset);
    offset += 4; //options
    XByteBuffer.toBytes(timestamp,data,offset);
    offset += 8; //timestamp
    XByteBuffer.toBytes(uniqueId.length,data,offset);
    offset += 4; //uniqueId.length
    System.arraycopy(uniqueId,0,data,offset,uniqueId.length);
    offset += uniqueId.length; //uniqueId data
    XByteBuffer.toBytes(addr.length,data,offset);
    offset += 4; //addr.length
    System.arraycopy(addr,0,data,offset,addr.length);
    offset += addr.length; //addr data
    XByteBuffer.toBytes(message.getLength(),data,offset);
    offset += 4; //message.length
    System.arraycopy(message.getBytesDirect(),0,data,offset,message.getLength());
    offset += message.getLength(); //message data
    return data;
}
 

public static ChannelData getDataFromPackage(byte[] b)  {
    ChannelData data = new ChannelData(false);
    int offset = 0;
    data.setOptions(XByteBuffer.toInt(b,offset));
    offset += 4; //options
    data.setTimestamp(XByteBuffer.toLong(b,offset));
    offset += 8; //timestamp
    data.uniqueId = new byte[XByteBuffer.toInt(b,offset)];
    offset += 4; //uniqueId length
    System.arraycopy(b,offset,data.uniqueId,0,data.uniqueId.length);
    offset += data.uniqueId.length; //uniqueId data
    byte[] addr = new byte[XByteBuffer.toInt(b,offset)];
    offset += 4; //addr length
    System.arraycopy(b,offset,addr,0,addr.length);
    data.setAddress(MemberImpl.getMember(addr));
    offset += addr.length; //addr data
    int xsize = XByteBuffer.toInt(b,offset);
    //data.message = new XByteBuffer(new byte[xsize],false);
    data.message = BufferPool.getBufferPool().getBuffer(xsize,false);
    offset += 4; //message length
    System.arraycopy(b,offset,data.message.getBytesDirect(),0,xsize);
    data.message.append(b,offset,xsize);
    offset += xsize; //message data
    return data;
}
 

public static ChannelData getDataFromPackage(byte[] b)  {
    ChannelData data = new ChannelData(false);
    int offset = 0;
    data.setOptions(XByteBuffer.toInt(b,offset));
    offset += 4; //options
    data.setTimestamp(XByteBuffer.toLong(b,offset));
    offset += 8; //timestamp
    data.uniqueId = new byte[XByteBuffer.toInt(b,offset)];
    offset += 4; //uniqueId length
    System.arraycopy(b,offset,data.uniqueId,0,data.uniqueId.length);
    offset += data.uniqueId.length; //uniqueId data
    byte[] addr = new byte[XByteBuffer.toInt(b,offset)];
    offset += 4; //addr length
    System.arraycopy(b,offset,addr,0,addr.length);
    data.setAddress(MemberImpl.getMember(addr));
    offset += addr.length; //addr data
    int xsize = XByteBuffer.toInt(b,offset);
    //data.message = new XByteBuffer(new byte[xsize],false);
    data.message = BufferPool.getBufferPool().getBuffer(xsize,false);
    offset += 4; //message length
    System.arraycopy(b,offset,data.message.getBytesDirect(),0,xsize);
    data.message.append(b,offset,xsize);
    offset += xsize; //message data
    return data;
}
 

public static ChannelData getDataFromPackage(byte[] b)  {
    ChannelData data = new ChannelData(false);
    int offset = 0;
    data.setOptions(XByteBuffer.toInt(b,offset));
    offset += 4; //options
    data.setTimestamp(XByteBuffer.toLong(b,offset));
    offset += 8; //timestamp
    data.uniqueId = new byte[XByteBuffer.toInt(b,offset)];
    offset += 4; //uniqueId length
    System.arraycopy(b,offset,data.uniqueId,0,data.uniqueId.length);
    offset += data.uniqueId.length; //uniqueId data
    byte[] addr = new byte[XByteBuffer.toInt(b,offset)];
    offset += 4; //addr length
    System.arraycopy(b,offset,addr,0,addr.length);
    data.setAddress(MemberImpl.getMember(addr));
    offset += addr.length; //addr data
    int xsize = XByteBuffer.toInt(b,offset);
    //data.message = new XByteBuffer(new byte[xsize],false);
    data.message = BufferPool.getBufferPool().getBuffer(xsize,false);
    offset += 4; //message length
    System.arraycopy(b,offset,data.message.getBytesDirect(),0,xsize);
    data.message.append(b,offset,xsize);
    offset += xsize; //message data
    return data;
}
 

public int getDataPackageLength() {
    int length = 
        4 + //options
        8 + //timestamp  off=4
        4 + //unique id length off=12
        uniqueId.length+ //id data off=12+uniqueId.length
        4 + //addr length off=12+uniqueId.length+4
        ((MemberImpl)address).getDataLength()+ //member data off=12+uniqueId.length+4+add.length
        4 + //message length off=12+uniqueId.length+4+add.length+4
        message.getLength();
    return length;

}
 

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;
}
 

/**
 * Deserializes a ChannelData object from a byte array
 * @param xbuf byte[]
 * @return ChannelData
 */
public static ChannelData getDataFromPackage(XByteBuffer xbuf)  {
    ChannelData data = new ChannelData(false);
    int offset = 0;
    data.setOptions(XByteBuffer.toInt(xbuf.getBytesDirect(),offset));
    offset += 4; //options
    data.setTimestamp(XByteBuffer.toLong(xbuf.getBytesDirect(),offset));
    offset += 8; //timestamp
    data.uniqueId = new byte[XByteBuffer.toInt(xbuf.getBytesDirect(),offset)];
    offset += 4; //uniqueId length
    System.arraycopy(xbuf.getBytesDirect(),offset,data.uniqueId,0,data.uniqueId.length);
    offset += data.uniqueId.length; //uniqueId data
    //byte[] addr = new byte[XByteBuffer.toInt(xbuf.getBytesDirect(),offset)];
    int addrlen = XByteBuffer.toInt(xbuf.getBytesDirect(),offset);
    offset += 4; //addr length
    //System.arraycopy(xbuf.getBytesDirect(),offset,addr,0,addr.length);
    data.setAddress(MemberImpl.getMember(xbuf.getBytesDirect(),offset,addrlen));
    //offset += addr.length; //addr data
    offset += addrlen;
    int xsize = XByteBuffer.toInt(xbuf.getBytesDirect(),offset);
    offset += 4; //xsize length
    System.arraycopy(xbuf.getBytesDirect(),offset,xbuf.getBytesDirect(),0,xsize);
    xbuf.setLength(xsize);
    data.message = xbuf;
    return data;

}
 

public static Member[] diff(Membership complete, Membership local, MemberImpl ignore) {
    ArrayList<Member> result = new ArrayList<Member>();
    MemberImpl[] comp = complete.getMembers();
    for ( int i=0; i<comp.length; i++ ) {
        if ( ignore!=null && ignore.equals(comp[i]) ) continue;
        if ( local.getMember(comp[i]) == null ) result.add(comp[i]);
    }
    return result.toArray(new MemberImpl[result.size()]);
}
 

public void init() throws Exception {
    synchronized (Selector.class) {
        // Selector.open() isn't thread safe
        // http://bugs.sun.com/view_bug.do?bug_id=6427854
        // Affects 1.6.0_29, fixed in 1.7.0_01
        selector = Selector.open();
    }
    mbr = new MemberImpl("localhost",4444,0);
    NioSender sender = new NioSender();
    sender.setDestination(mbr);
    sender.setDirectBuffer(true);
    sender.setSelector(selector);
    sender.setMessage(XByteBuffer.createDataPackage(getMessage(mbr)));
    sender.connect();
}
 

public ChannelData createData(CoordinationMessage msg, MemberImpl local) {
    msg.write();
    ChannelData data = new ChannelData(true);
    data.setAddress(local);
    data.setMessage(msg.getBuffer());
    data.setOptions(Channel.SEND_OPTIONS_USE_ACK);
    data.setTimestamp(System.currentTimeMillis());
    return data;
}
 

public Member getNextInLine(MemberImpl local, MemberImpl[] others) {
    MemberImpl result = null;
    for ( int i=0; i<others.length; i++ ) {
        
    }
    return result;
}
 

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)), COORD_REQUEST);
    return msg;
}
 

/**
 * @deprecated  Unused - will be removed in 8.0.x
 */
@Deprecated
protected void writeMembers(ObjectOutput out,Member[] members) throws IOException {
    if ( members == null ) members = new Member[0];
    out.writeInt(members.length);
    for (int i=0; i<members.length; i++ ) {
        if ( members[i] != null ) {
            byte[] d = members[i] != null ? ( (MemberImpl)members[i]).getData(false) : new byte[0];
            out.writeInt(d.length);
            out.write(d);
        }
    }
}
 

/**
 * @deprecated  Unused - will be removed in 8.0.x
 */
@Deprecated
protected Member[] readMembers(ObjectInput in) throws IOException {
    int nodecount = in.readInt();
    Member[] members = new Member[nodecount];
    for ( int i=0; i<members.length; i++ ) {
        byte[] d = new byte[in.readInt()];
        in.readFully(d);
        if (d.length > 0) members[i] = MemberImpl.getMember(d);
    }
    return members;
}
 

public static void main(String[] args) throws Exception {
    Member mbr = new MemberImpl("localhost", 9999, 0);
    ChannelData data = new ChannelData();
    data.setAddress(mbr);
    byte[] buf = new byte[8192 * 4];
    data.setMessage(new XByteBuffer(buf, false));
    buf = XByteBuffer.createDataPackage(data);
    len = buf.length;
    NioReceiver receiver = new NioReceiver();
    receiver.setPort(9999);
    receiver.setHost("localhost");
    MyList list = new MyList();
    receiver.setMessageListener(list);
    receiver.start();
    System.out.println("Listening on 9999");
    while (true) {
        try {
            synchronized (mutex) {
                mutex.wait(5000);
                if ( start != 0 ) {
                    System.out.println("Throughput " + df.format(mb / seconds) + " MB/seconds, messages "+count+" accepts "+accept+", total "+mb+" MB.");
                }
            }
        }catch (Throwable x) {
            x.printStackTrace();
        }
    }
}