/// <summary>
/// Sends a Heartbeat to the <i>next</i> member in the group
/// </summary>
public void run()
{
Message suspect_msg, hb_req;
FdHeader hdr;
long not_heard_from = 0; // time in msecs we haven't heard from ping_dest
if (fd.ping_dest == null)
{
if (Trace.trace)
{
Trace.error("FD.Monitor.run()", "ping_dest is null");
}
return;
}
// 1. send heartbeat request
hb_req = new Message(fd.ping_dest, null, null);
hb_req.putHeader(fd.Name, new FdHeader(FdHeader.HEARTBEAT)); // send heartbeat request
if (Trace.trace)
{
Trace.info("FD.Monitor.run()", "sending are-you-alive msg to " + fd.ping_dest);
}
fd.passDown(new Event(Event.MSG, hb_req));
// 2. If the time of the last heartbeat is > timeout and max_tries heartbeat messages have not been
// received, then broadcast a SUSPECT message. Will be handled by coordinator, which may install
// a new view
not_heard_from = System.Environment.TickCount - fd.last_ack;
if (not_heard_from >= fd.timeout)
{
// no heartbeat ack for more than timeout msecs
if (fd.num_tries >= fd.max_tries)
{
if (Trace.trace)
{
Trace.info("FD.Monitor.run()", "[" + fd.local_addr + "]: received no heartbeat ack from " + fd.ping_dest + ", suspecting it");
}
hdr = new FdHeader(FdHeader.SUSPECT);
hdr.suspected_mbr = fd.ping_dest;
hdr.from = fd.local_addr;
suspect_msg = new Message(null, null, null); // mcast SUSPECT to all members
suspect_msg.putHeader(fd.Name, hdr);
fd.passDown(new Event(Event.MSG, suspect_msg));
}
else
{
if (Trace.trace)
{
Trace.info("FD.Monitor.run()", "heartbeat missing from " + fd.ping_dest +
" (number=" + fd.num_tries + ")");
}
fd.num_tries++;
}
}
}
/// <summary>
/// Sends a Heartbeat to the <i>next</i> member in the group
/// </summary>
public void run()
{
Message suspect_msg, hb_req;
FdHeader hdr;
long not_heard_from=0; // time in msecs we haven't heard from ping_dest
if(fd.ping_dest == null)
{
if(Trace.trace)
Trace.error("FD.Monitor.run()", "ping_dest is null");
return;
}
// 1. send heartbeat request
hb_req=new Message(fd.ping_dest, null, null);
hb_req.putHeader(fd.Name, new FdHeader(FdHeader.HEARTBEAT)); // send heartbeat request
if(Trace.trace)
Trace.info("FD.Monitor.run()", "sending are-you-alive msg to " + fd.ping_dest);
fd.passDown(new Event(Event.MSG, hb_req));
// 2. If the time of the last heartbeat is > timeout and max_tries heartbeat messages have not been
// received, then broadcast a SUSPECT message. Will be handled by coordinator, which may install
// a new view
not_heard_from=System.Environment.TickCount - fd.last_ack;
if(not_heard_from >= fd.timeout)
{
// no heartbeat ack for more than timeout msecs
if(fd.num_tries >= fd.max_tries)
{
if(Trace.trace)
Trace.info("FD.Monitor.run()", "[" + fd.local_addr + "]: received no heartbeat ack from " + fd.ping_dest + ", suspecting it");
hdr=new FdHeader(FdHeader.SUSPECT);
hdr.suspected_mbr=fd.ping_dest;
hdr.from=fd.local_addr;
suspect_msg=new Message(null,null,null); // mcast SUSPECT to all members
suspect_msg.putHeader(fd.Name, hdr);
fd.passDown(new Event(Event.MSG, suspect_msg));
}
else
{
if(Trace.trace)
Trace.info("FD.Monitor.run()", "heartbeat missing from " + fd.ping_dest +
" (number=" + fd.num_tries + ")");
fd.num_tries++;
}
}
}
/// <summary>
/// Processes <c>Events</c> traveling up the stack
/// </summary>
/// <param name="evt">The Event to be processed</param>
public override void up(Event evt)
{
Message msg;
FdHeader hdr = null;
Object sender, tmphdr;
switch (evt.Type)
{
case Event.SET_LOCAL_ADDRESS:
local_addr = (Address)evt.Arg;
break;
case Event.MSG:
msg = (Message)evt.Arg;
tmphdr = msg.getHeader(getName());
if (tmphdr == null || !(tmphdr is FdHeader))
{
if (ping_dest != null && (sender = msg.Source) != null)
{
if (ping_dest.Equals(sender))
{
last_ack = System.Environment.TickCount;
if (Trace.trace)
{
Trace.info("FD.up()", "received msg from " + sender + " (counts as ack)");
}
num_tries = 0;
}
}
break; // message did not originate from FD layer, just pass up
}
hdr = (FdHeader)msg.removeHeader(getName());
switch (hdr.type)
{
case FdHeader.HEARTBEAT: // heartbeat request; send heartbeat ack
Address hb_sender = msg.Source;
Message hb_ack = new Message(msg.Source, null, null);
FdHeader tmp_hdr = new FdHeader(FdHeader.HEARTBEAT_ACK);
// 1. Send an ack
tmp_hdr.from = local_addr;
hb_ack.putHeader(getName(), tmp_hdr);
passDown(new Event(Event.MSG, hb_ack));
// 2. Shun the sender of a HEARTBEAT message if that sender is not a member. This will cause
// the sender to leave the group (and possibly rejoin it later)
if (shun)
{
shunInvalidHeartbeatSender(hb_sender);
}
if (ping_dest == null) // we're being pinged but not pinging anyone
{
stop();
ping_dest = (Address)getPingDest(members);
if (ping_dest != null)
{
startMonitor();
}
}
break; // don't pass up !
case FdHeader.HEARTBEAT_ACK: // heartbeat ack
if (ping_dest != null && ping_dest.Equals(hdr.from))
{
last_ack = System.Environment.TickCount;
num_tries = 0;
if (Trace.trace)
{
Trace.info("FD.up()", "received ack from " + hdr.from);
}
}
else
{
stop();
ping_dest = (Address)getPingDest(members);
if (ping_dest != null)
{
startMonitor();
}
}
break;
case FdHeader.SUSPECT:
if (hdr.suspected_mbr != null)
{
if (Trace.trace)
{
Trace.info("FD.up()", "[SUSPECT] suspect hdr is " + hdr);
}
if (local_addr != null && hdr.suspected_mbr != null && hdr.suspected_mbr.Equals(local_addr))
{
if (Trace.trace)
{
Trace.warn("FD.up()", "I was suspected, but will not remove myself from membership " + "(waiting for EXIT message)");
}
else
{
members.Remove(hdr.suspected_mbr);
}
}
ping_dest = (Address)getPingDest(members);
passUp(new Event(Event.SUSPECT, hdr.suspected_mbr));
passDown(new Event(Event.SUSPECT, hdr.suspected_mbr));
}
break;
case FdHeader.NOT_MEMBER:
if (shun)
{
if (Trace.trace)
{
Trace.info("FD.up()", "[NOT_MEMBER] I'm being shunned; exiting");
}
passUp(new Event(Event.EXIT));
}
break;
}
return;
}
passUp(evt); // pass up to the layer above us
}
/// <summary>
/// Processes <c>Events</c> traveling up the stack
/// </summary>
/// <param name="evt">The Event to be processed</param>
public override void up(Event evt)
{
Message msg;
FdHeader hdr=null;
Object sender, tmphdr;
switch(evt.Type)
{
case Event.SET_LOCAL_ADDRESS:
local_addr=(Address)evt.Arg;
break;
case Event.MSG:
msg=(Message)evt.Arg;
tmphdr=msg.getHeader(getName());
if(tmphdr == null || !(tmphdr is FdHeader))
{
if(ping_dest != null && (sender=msg.Source) != null)
{
if(ping_dest.Equals(sender))
{
last_ack=System.Environment.TickCount;
if(Trace.trace)
Trace.info("FD.up()", "received msg from " + sender + " (counts as ack)");
num_tries=0;
}
}
break; // message did not originate from FD layer, just pass up
}
hdr=(FdHeader)msg.removeHeader(getName());
switch(hdr.type)
{
case FdHeader.HEARTBEAT: // heartbeat request; send heartbeat ack
Address hb_sender=msg.Source;
Message hb_ack=new Message(msg.Source, null, null);
FdHeader tmp_hdr=new FdHeader(FdHeader.HEARTBEAT_ACK);
// 1. Send an ack
tmp_hdr.from=local_addr;
hb_ack.putHeader(getName(), tmp_hdr);
passDown(new Event(Event.MSG, hb_ack));
// 2. Shun the sender of a HEARTBEAT message if that sender is not a member. This will cause
// the sender to leave the group (and possibly rejoin it later)
if(shun)
shunInvalidHeartbeatSender(hb_sender);
if(ping_dest == null) // we're being pinged but not pinging anyone
{
stop();
ping_dest=(Address)getPingDest(members);
if(ping_dest != null)
startMonitor();
}
break; // don't pass up !
case FdHeader.HEARTBEAT_ACK: // heartbeat ack
if(ping_dest != null && ping_dest.Equals(hdr.from))
{
last_ack=System.Environment.TickCount;
num_tries=0;
if(Trace.trace)
Trace.info("FD.up()", "received ack from " + hdr.from);
}
else
{
stop();
ping_dest=(Address)getPingDest(members);
if(ping_dest != null)
startMonitor();
}
break;
case FdHeader.SUSPECT:
if(hdr.suspected_mbr != null)
{
if(Trace.trace)
Trace.info("FD.up()", "[SUSPECT] suspect hdr is " + hdr);
if(local_addr != null && hdr.suspected_mbr != null && hdr.suspected_mbr.Equals(local_addr))
if(Trace.trace)
Trace.warn("FD.up()", "I was suspected, but will not remove myself from membership " + "(waiting for EXIT message)");
else
members.Remove(hdr.suspected_mbr);
ping_dest = (Address)getPingDest(members);
passUp(new Event(Event.SUSPECT, hdr.suspected_mbr));
passDown(new Event(Event.SUSPECT, hdr.suspected_mbr));
}
break;
case FdHeader.NOT_MEMBER:
if(shun)
{
if(Trace.trace)
Trace.info("FD.up()", "[NOT_MEMBER] I'm being shunned; exiting");
passUp(new Event(Event.EXIT));
}
break;
}
return;
}
passUp(evt); // pass up to the layer above us
}
