void RemoveProcessFromConstraint::redo() const
{
auto& constraint = m_path.find();
RemoveProcess(constraint, m_processId);
// The view models will be deleted accordingly.
}
void CheckElectionTimer(void)
{
MESSAGE msg;
int i;
if(!bElect)
return;
if(time(NULL)<ElectionTimer)
return;
/*TRACE("I won the Election");*/
printf("I won the election %d:%d \n",Me.pid,Me.IP);
SetCoord(&Me);
bElect=FALSE;
//Remove all members above me
while(1)
{
for(i=0;i<GroupSize;i++)
{
if(IsBigger(&GroupList[i],&Me))
{
RemoveProcess(&GroupList[i]);
continue;
}
}
break;
}
//Tell everyone that I'm the boss
msg.OpCode=IM_COORD;
for(i=0;i<GroupSize;i++)
{
msg.To=GroupList[i];
Send(&msg);
}
}//CheckElectionTimer
int main(int argc, char *argv[])
{
char hostname[80];
struct hostent *hostPtr;
struct sockaddr_in serverName;
fd_set ReadSet;
struct timeval TimeOut;
MESSAGE msg;
int on;
int status;
Init();
GroupPort=DEFAULT_PORT;
switch(argc)
{
case 2:
GroupPort=atoi(argv[1]);
//FALLTHROUGH
case 1:
break;
default:
fprintf(stderr, "Usage: %s [ServerPort]\n", argv[0]);
exit(1);
}/* switch(argc) */
s=socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);
if(s==INVALID_SOCKET)
ErrorExit("socket()");
on=1;
status=setsockopt(s,SOL_SOCKET,SO_REUSEADDR,
(char *)&on,sizeof(on));
if(status==SOCKET_ERROR)
ErrorExit("setsockopt(...,SO_REUSEADDR,...)");
status=setsockopt(s,SOL_SOCKET,SO_BROADCAST,
(char *)&on,sizeof(on));
if(status==SOCKET_ERROR)
ErrorExit("setsockopt(...,SO_BROADCAST,...)");
/*
* Find out who I am.
*/
status=_GetHostName(hostname,sizeof(hostname));
if(status==SOCKET_ERROR)
ErrorExit("_GetHostName()");
hostPtr=gethostbyname(hostname);
if(hostPtr==NULL)
ErrorExit("gethostbyname()");
ZERO(serverName);
serverName.sin_family=AF_INET;
serverName.sin_port=htons(GroupPort);
serverName.sin_addr.s_addr=INADDR_ANY;
/* A "feature" of Linux is that if I bind to a specific address
* it assumes that I don't want to get broadcasts.
*
* memcpy(&serverName.sin_addr,hostPtr->h_addr,hostPtr->h_length);
*/
status=bind(s,(struct sockaddr *)&serverName,sizeof(serverName));
if(status==SOCKET_ERROR)
ErrorExit("bind()");
/*
* Init Globals
*/
Me.pid=getpid();
Me.IP=*((DWORD *)hostPtr->h_addr);
printf("Hello. My Unique ID is %X %X.\n\n",Me.pid,Me.IP);
/*
* Join the group
*/
TRACE("Broadcasting JOIN");
msg.OpCode=JOIN;
msg.To=BcastAddr;
Send(&msg);
/*
* Start an election (Once we know who is in the group.)
*/
TRACE("Set Election Timer");
AYATimer=time(NULL)+AYA_TIMEOUT;
while(TRUE)
{
TimeOut.tv_sec=1;
TimeOut.tv_usec=0;
FD_ZERO(&ReadSet);
FD_SET(s,&ReadSet);
status=select(s+1,&ReadSet,NULL,NULL,&TimeOut);
if(status)
{
if(Recv(&msg))
{
switch(msg.OpCode)
{
case AYA:
TRACE("Received AYA");
msg.OpCode=IamA;
msg.To=msg.From;
Send(&msg);
break;
case IamA:
TRACE("Received IamA");
if(IsEqual(&msg.From,&Coord))
bCoordAlive=TRUE;
else
TRACE("IamA--Wrong Coordinator");
break;
case ELECT:
TRACE("Received ELECT");
msg.OpCode=ACK_ELECT;
msg.To=msg.From;
Send(&msg);
StartElection();
break;
case ACK_ELECT:
TRACE("Received ACK_ELECT");
CancelElection(&msg);
break;
case JOIN:
TRACE("Received JOIN");
//Broadcast can include myself
if(IsEqual(&msg.From,&Me))
{
TRACE("JOIN--From myself!");
break;
}
AddProcess(&msg.From);
msg.OpCode=WELCOME;
msg.To=msg.From;
Send(&msg);
//It looks like we need to restart our election
if(bElect && IsBigger(&msg.From,&Me))
{
bElect=FALSE;
StartElection();
}
break;
case WELCOME:
TRACE("Received WELCOME");
AddProcess(&msg.From);
break;
case IM_COORD:
TRACE("Received IM_COORD");
SetCoord(&msg.From);
break;
case LEAVE:
TRACE("Received LEAVE");
RemoveProcess(&msg.From);
if(IsEqual(&msg.From,&Coord))
StartElection();
}//switch(OpCode
}//if(Recv
}//if(status
CheckElectionTimer();
CheckAYATimer();
CheckAYAInterval();
}//while(1
return 0;
}//main
void AddOnlyProcessToConstraint::undo(ConstraintModel& constraint) const
{
RemoveProcess(constraint, m_createdProcessId);
}
