/// <summary>
/// Processes <c>Events</c> travelling up the stack
/// </summary>
/// <param name="evt">The Event to be processed</param>
public override void up(Event evt)
{
Message msg, rsp_msg;
Object obj;
PINGHeader hdr, rsp_hdr;
PingRsp rsp;
Address coord;
switch (evt.Type)
{
case Event.MSG:
msg = (Message)evt.Arg;
obj = msg.getHeader(name);
if (obj == null || !(obj is PINGHeader))
{
passUp(evt);
return;
}
hdr = (PINGHeader)msg.removeHeader(name);
switch (hdr.type)
{
case PINGHeader.GET_MBRS_REQ: // return Rsp(local_addr, coord)
if (!is_server)
{
return;
}
lock (members)
{
coord = members.Count > 0 ? (Address)members[0] : local_addr;
}
rsp_msg = new Message(msg.Source, null, null);
rsp_hdr = new PINGHeader(PINGHeader.GET_MBRS_RSP, new PingRsp(local_addr, coord));
rsp_msg.putHeader(name, rsp_hdr);
if (Trace.trace)
{
Trace.info("PING.up()", "received GET_MBRS_REQ from " + msg.Source + ", returning " + rsp_hdr);
}
passDown(new Event(Event.MSG, rsp_msg));
return;
case PINGHeader.GET_MBRS_RSP: // add response to vector and notify waiting thread
rsp = (PingRsp)hdr.arg;
lock (initial_members)
{
if (Trace.trace)
{
Trace.info("PING.up()", "received FIND_INITAL_MBRS_RSP, rsp=" + rsp);
}
initial_members.Add(rsp);
Monitor.Pulse(initial_members);
}
return;
default:
if (Trace.trace)
{
Trace.warn("PING.up()", "got PING header with unknown type (" + hdr.type + ")");
}
return;
}
case Event.SET_LOCAL_ADDRESS:
passUp(evt);
local_addr = (Address)evt.Arg;
break;
default:
passUp(evt); // Pass up to the layer above us
break;
}
}
/// <summary>
/// Processes <c>Events</c> traveling down the stack
/// </summary>
/// <param name="evt">The Event to be processed</param>
public override void down(Event evt)
{
Message msg;
PINGHeader hdr;
long time_to_wait, start_time;
switch(evt.Type)
{
case Event.FIND_INITIAL_MBRS: // sent by GMS layer, pass up a GET_MBRS_OK event
initial_members.Clear();
// 1. Mcast GET_MBRS_REQ message
if(Trace.trace) Trace.info("PING.down()", "FIND_INITIAL_MBRS");
hdr=new PINGHeader(PINGHeader.GET_MBRS_REQ, null);
msg=new Message(null, null, null); // mcast msg
msg.putHeader(name, hdr);
passDown(new Event(Event.MSG, msg));
// 2. Wait 'timeout' ms or until 'num_initial_members' have been retrieved
lock(initial_members)
{
start_time = System.Environment.TickCount;
time_to_wait=timeout;
while(initial_members.Count < num_initial_members && time_to_wait > 0)
{
if(Trace.trace)
Trace.info("PING.down()", "waiting for initial members: time_to_wait=" + time_to_wait +
", got " + initial_members.Count + " rsps");
Monitor.Wait(initial_members, (int)time_to_wait);
time_to_wait -= System.Environment.TickCount - start_time;
}
if(Trace.trace)
Trace.info("PING.down()", "No longer waiting for members as Initial Members = " + initial_members.Count.ToString() + "|" + num_initial_members + " TimeToWait = " + time_to_wait );
}
// 3. Send response
if(Trace.trace)
Trace.info("PING.down()", "initial mbrs are " + initialMembersString());
passUp(new Event(Event.FIND_INITIAL_MBRS_OK, initial_members));
break;
//case Event.TMP_VIEW:
case Event.VIEW_CHANGE:
ArrayList tmp;
if((tmp=((View)evt.Arg).getMembers()) != null)
{
lock(members)
{
members.Clear();
for(int i=0; i < tmp.Count; i++)
members.Add(tmp[i]);
}
}
passDown(evt);
break;
case Event.BECOME_SERVER: // called after client has joined and is fully working group member
passDown(evt);
is_server=true;
break;
case Event.CONNECT:
group_addr=(String)evt.Arg;
passDown(evt);
break;
default:
passDown(evt); // Pass on to the layer below us
break;
}
}
/// <summary>
/// Processes <c>Events</c> traveling down the stack
/// </summary>
/// <param name="evt">The Event to be processed</param>
public override void down(Event evt)
{
Message msg;
PINGHeader hdr;
long time_to_wait, start_time;
switch (evt.Type)
{
case Event.FIND_INITIAL_MBRS: // sent by GMS layer, pass up a GET_MBRS_OK event
initial_members.Clear();
// 1. Mcast GET_MBRS_REQ message
if (Trace.trace)
{
Trace.info("PING.down()", "FIND_INITIAL_MBRS");
}
hdr = new PINGHeader(PINGHeader.GET_MBRS_REQ, null);
msg = new Message(null, null, null); // mcast msg
msg.putHeader(name, hdr);
passDown(new Event(Event.MSG, msg));
// 2. Wait 'timeout' ms or until 'num_initial_members' have been retrieved
lock (initial_members)
{
start_time = System.Environment.TickCount;
time_to_wait = timeout;
while (initial_members.Count < num_initial_members && time_to_wait > 0)
{
if (Trace.trace)
{
Trace.info("PING.down()", "waiting for initial members: time_to_wait=" + time_to_wait +
", got " + initial_members.Count + " rsps");
}
Monitor.Wait(initial_members, (int)time_to_wait);
time_to_wait -= System.Environment.TickCount - start_time;
}
if (Trace.trace)
{
Trace.info("PING.down()", "No longer waiting for members as Initial Members = " + initial_members.Count.ToString() + "|" + num_initial_members + " TimeToWait = " + time_to_wait);
}
}
// 3. Send response
if (Trace.trace)
{
Trace.info("PING.down()", "initial mbrs are " + initialMembersString());
}
passUp(new Event(Event.FIND_INITIAL_MBRS_OK, initial_members));
break;
//case Event.TMP_VIEW:
case Event.VIEW_CHANGE:
ArrayList tmp;
if ((tmp = ((View)evt.Arg).getMembers()) != null)
{
lock (members)
{
members.Clear();
for (int i = 0; i < tmp.Count; i++)
{
members.Add(tmp[i]);
}
}
}
passDown(evt);
break;
case Event.BECOME_SERVER: // called after client has joined and is fully working group member
passDown(evt);
is_server = true;
break;
case Event.CONNECT:
group_addr = (String)evt.Arg;
passDown(evt);
break;
default:
passDown(evt); // Pass on to the layer below us
break;
}
}
/// <summary>
/// Processes <c>Events</c> travelling up the stack
/// </summary>
/// <param name="evt">The Event to be processed</param>
public override void up(Event evt)
{
Message msg, rsp_msg;
Object obj;
PINGHeader hdr, rsp_hdr;
PingRsp rsp;
Address coord;
switch(evt.Type)
{
case Event.MSG:
msg=(Message)evt.Arg;
obj=msg.getHeader(name);
if(obj == null || !(obj is PINGHeader))
{
passUp(evt);
return;
}
hdr=(PINGHeader)msg.removeHeader(name);
switch(hdr.type)
{
case PINGHeader.GET_MBRS_REQ: // return Rsp(local_addr, coord)
if(!is_server)
{
return;
}
lock(members)
{
coord=members.Count > 0 ? (Address)members[0] : local_addr;
}
rsp_msg=new Message(msg.Source, null, null);
rsp_hdr=new PINGHeader(PINGHeader.GET_MBRS_RSP, new PingRsp(local_addr, coord));
rsp_msg.putHeader(name, rsp_hdr);
if(Trace.trace) Trace.info("PING.up()", "received GET_MBRS_REQ from " + msg.Source+ ", returning " + rsp_hdr);
passDown(new Event(Event.MSG, rsp_msg));
return;
case PINGHeader.GET_MBRS_RSP: // add response to vector and notify waiting thread
rsp=(PingRsp)hdr.arg;
lock(initial_members)
{
if(Trace.trace)
Trace.info("PING.up()", "received FIND_INITAL_MBRS_RSP, rsp=" + rsp);
initial_members.Add(rsp);
Monitor.Pulse(initial_members);
}
return;
default:
if(Trace.trace)
Trace.warn("PING.up()", "got PING header with unknown type (" + hdr.type + ")");
return;
}
case Event.SET_LOCAL_ADDRESS:
passUp(evt);
local_addr=(Address)evt.Arg;
break;
default:
passUp(evt); // Pass up to the layer above us
break;
}
}
