/// <summary>ConnectionTable.Receiver interface </summary>
public virtual void receive(Message msg)
{
TcpHeader hdr = null;
msg.Dest = local_addr;
Event evt = new Event();
evt.Arg = msg;
evt.Priority = msg.Priority;
evt.Type = Event.MSG;
HearBeat hrtBeat = msg.removeHeader(HeaderType.KEEP_ALIVE) as HearBeat;
if (hrtBeat != null && _keepAlive != null)
{
_keepAlive.ReceivedHeartBeat(msg.Src, hrtBeat);
return;
}
TOTAL.HDR totalhdr = msg.getHeader(HeaderType.TOTAL) as TOTAL.HDR;
if (!asyncPassup)
this.receiveUpEvent(evt);
else
System.Threading.ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadPoolPassup), evt);
}
/// <summary> Received an mcast request - Ignore if not the sequencer, else send an
/// mcast reply
///
/// </summary>
/// <param name="msg">the multicast request message
/// </param>
private void _recvMcastRequest(Message msg)
{
HDR header;
Message repMsg;
// i. If blocked, discard the mcast request
// ii. Assign a seqID to the message and send it back to the requestor
if (Stack.NCacheLog.IsInfoEnabled) Stack.NCacheLog.Info("TOTAL._recvMcastRequest()", "hdr = " + Global.CollectionToString(msg.Headers));
if (!addr.Equals(_groupSequencerAddr))
{
Stack.NCacheLog.Error("Received mcast request from " + msg.Src.ToString() + " but not a group sequencer");
return;
}
if (state == BLOCK)
{
if (Stack.NCacheLog.IsInfoEnabled) Stack.NCacheLog.Info("Blocked, discard mcast req");
return;
}
header = (HDR)msg.getHeader(HeaderType.TOTAL);
repMsg = new Message(msg.Src, addr, new byte[0]);
repMsg.Priority = msg.Priority;
int viewId = -1;
try
{
stateLock.AcquireReaderLock(Timeout.Infinite);
viewId = (int)(currentViewId != null ? currentViewId.Id : -1);
}
finally
{
stateLock.ReleaseReaderLock();
}
HDR reqHdr = new HDR(HDR.REPMCAST, header.localSeqID, NextMCastSeqID, viewId);
repMsg.putHeader(HeaderType.TOTAL, reqHdr);
repMsg.IsUserMsg = true;
repMsg.Type = MsgType.TOKEN_SEEKING;
passDown(new Event(Event.MSG, repMsg));
}
/// <summary>
/// Handles a message coming from a layer below
/// </summary>
/// <returns> true if the event should be forwarded further up, otherwise false
/// (message was consumed)
/// </returns>
public virtual bool receiveMessage(Message msg)
{
object tmpHdr;
HDR hdr;
RspCollector coll;
System.Collections.IList dests;
// i. If header is not an instance of request correlator header, ignore
//
// ii. Check whether the message was sent by a request correlator with
// the same name (there may be multiple request correlators in the same
// protocol stack...)
tmpHdr = msg.getHeader(HeaderType.REQUEST_COORELATOR);
if (!(tmpHdr is HDR))
return (true);
hdr = (HDR) tmpHdr;
// If the header contains a destination list, and we are not part of it, then we discard the
// request (was addressed to other members)
dests = hdr.dest_mbrs;
if (dests != null && local_addr != null && !dests.Contains(local_addr))
{
NCacheLog.Debug("RequestCorrelator.receiveMessage()", "discarded request from " + msg.Src + " as we are not part of destination list (local_addr=" + local_addr + ", hdr=" + hdr + ')');
return false;
}
if (!hdr.doProcess)
{
NCacheLog.Debug("RequestCorrelator.receiveMessage()", hdr.id + " I should not process");
return false;
}
if(NCacheLog.IsInfoEnabled) NCacheLog.Info("RequestCorrelator.receiveMessage()", "header is " + hdr);
// [HDR.REQ]:
// i. If there is no request handler, discard
// ii. Check whether priority: if synchronous and call stack contains
// address that equals local address -> add priority request. Else
// add normal request.
//
// [HDR.RSP]:
// Remove the msg request correlator header and notify the associated
// <tt>RspCollector</tt> that a reply has been received
switch (hdr.type)
{
case HDR.GET_REQ_STATUS:
case HDR.REQ:
if (request_handler == null)
return (false);
//In case of NHop requests, the response is not sent to the sender of the request. Instead,
//response is sent back to a node whose address is informed by the sender.
handleRequest(msg,hdr.whomToReply);
break;
case HDR.NHOP_REQ:
handleNHopRequest(msg);
break;
case HDR.RSP:
msg.removeHeader(HeaderType.REQUEST_COORELATOR);
coll = findEntry(hdr.id);
if (coll != null)
{
coll.receiveResponse(msg);
}
break;
case HDR.NHOP_RSP:
msg.removeHeader(HeaderType.REQUEST_COORELATOR);
coll = findEntry(hdr.id);
if (coll != null)
{
if (hdr.expectResponseFrom != null)
{
if (coll is GroupRequest)
{
GroupRequest groupRequest = coll as GroupRequest;
groupRequest.AddNHop(hdr.expectResponseFrom);
groupRequest.AddNHopDefaultStatus(hdr.expectResponseFrom);
}
}
coll.receiveResponse(msg);
}
break;
default:
msg.removeHeader(HeaderType.REQUEST_COORELATOR);
NCacheLog.Error("RequestCorrelator.receiveMessage()", "header's type is neither REQ nor RSP !");
break;
}
return (false);
}
/// <summary> Receive a multicast message: Put it in the pending up queue and then
/// try to deliver above as many messages as possible
///
/// </summary>
/// <param name="msg">the received broadcast message
/// </param>
private void _recvMcast(Message msg)
{
HDR header = (HDR)msg.getHeader(HeaderType.TOTAL);
// i. Put the message in the up pending queue only if it's not
// already there, as it seems that the event may be received
// multiple times before a view change when all members are
// negotiating a common set of stable msgs
//
// ii. Deliver as many messages as possible
int existingViewId = -1;
try
{
stateLock.AcquireReaderLock(Timeout.Infinite);
existingViewId = (int)(currentViewId != null ? currentViewId.Id : -1);
}
finally
{
stateLock.ReleaseReaderLock();
}
lock (_mcastUpTbl.SyncRoot)
{
if (header.seqID <= _mcastSeqID)
{
if (header.viewId > existingViewId)
{
//this messages is of latest view therefore we put it into the table.
lock (_undeliveredMessages.SyncRoot)
{
_undeliveredMessages.Add(new Event(Event.MSG, msg, msg.Priority));
}
return;
}
if (Stack.NCacheLog.IsErrorEnabled) Stack.NCacheLog.Error("TOTAL._recvMcast", header.seqID + " is already consumed");
return;
}
else
{
if (header.viewId < existingViewId)
{
//this messages is of an old view therefore we discard it
return;
}
}
_mcastUpTbl[(long)header.seqID] = msg;
}
if (Stack.NCacheLog.IsInfoEnabled) Stack.NCacheLog.Info("muds: delivering mcast a message with seq : " + header.seqID);
_deliverMcast();
}
/// <summary> Send a request to a group. If no response collector is given, no
/// responses are expected (making the call asynchronous).
///
/// </summary>
/// <param name="id">The request ID. Must be unique for this JVM (e.g. current
/// time in millisecs)
/// </param>
/// <param name="dest_mbrs">The list of members who should receive the call. Usually a group RPC
/// is sent via multicast, but a receiver drops the request if its own address
/// is not in this list. Will not be used if it is null.
/// </param>
/// <param name="msg">The request to be sent. The body of the message carries
/// the request data
///
/// </param>
/// <param name="coll">A response collector (usually the object that invokes
/// this method). Its methods <code>ReceiveResponse</code> and
/// <code>Suspect</code> will be invoked when a message has been received
/// or a member is suspected, respectively.
/// </param>
public virtual void sendRequest(long id, System.Collections.ArrayList dest_mbrs, Message msg, RspCollector coll, byte hdrType)
{
HDR hdr = null;
if (transport == null)
{
NCacheLog.Warn("RequestCorrelator.sendRequest()", "transport is not available !");
return ;
}
// i. Create the request correlator header and add it to the
// msg
// ii. If a reply is expected (sync call / 'coll != null'), add a
// coresponding entry in the pending requests table
// iii. If deadlock detection is enabled, set/update the call stack
// iv. Pass the msg down to the protocol layer below
hdr = msg.getHeader(HeaderType.REQUEST_COORELATOR) as RequestCorrelator.HDR;
if (hdr == null)
{
hdr = new HDR();
hdr.type = hdrType;
hdr.id = id;
hdr.rsp_expected = coll != null ? true : false;
hdr.dest_mbrs = dest_mbrs;
}
if (coll != null)
{
if (deadlock_detection)
{
if (local_addr == null)
{
NCacheLog.Error("RequestCorrelator.sendRequest()", "local address is null !");
return ;
}
System.Collections.ArrayList new_call_stack = (call_stack != null?(System.Collections.ArrayList) call_stack.Clone():new System.Collections.ArrayList());
new_call_stack.Add(local_addr);
hdr.call_stack = new_call_stack;
}
addEntry(hdr.id, new RequestEntry(coll), dest_mbrs);
}
msg.putHeader(HeaderType.REQUEST_COORELATOR, hdr);
try
{
if (transport is Protocol)
{
Event evt = new Event();
evt.Type = Event.MSG;
evt.Arg = msg;
((Protocol)transport).passDown(evt);
}
else if (transport is Transport)
((Transport)transport).send(msg);
else
NCacheLog.Error("RequestCorrelator.sendRequest()", "transport object has to be either a " + "Transport or a Protocol, however it is a " + transport.GetType());
}
catch (System.Exception e)
{
NCacheLog.Error("RequestCorrelator.sendRequest()",e.ToString());
}
}
