Example 3
Author: Ambreen Ilyas

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//// This example is from the ACE Programmers Guide.
//// Chapter: "The Message Queue"
//// For details please see the guide at
//// http://www.cs.wustl.edu/~schmidt/ACE.html
//// AUTHOR: Umar Syyid (usyyid@hns.com)
//// and Ambreen Ilyas (ambreen@bitsmart.com)
/////////////////////////////////////////////////////////////////////////////////////////////////////////////

//Example 3
#include "ace/Message_Queue.h"
#include "ace/Get_Opt.h"
#include "ace/OS.h"

class Args{
public:
Args(int argc, char*argv[],int& no_msgs, int& time,ACE_Message_Queue<ACE_NULL_SYNCH>* &mq){
ACE_Get_Opt get_opts(argc,argv,"h:l:t:n:xsd");
while((opt=get_opts())!=-1)
switch(opt){
case 't':
time=ACE_OS::atoi(get_opts.optarg);
ACE_DEBUG((LM_INFO,"Time: %d \n",time));
break;
case 'n':
no_msgs=ACE_OS::atoi(get_opts.optarg);
ACE_DEBUG((LM_INFO,"Number of Messages %d \n",no_msgs));
break;
case 'x':
mq=ACE_Message_Queue_Factory<ACE_NULL_SYNCH>:: create_laxity_message_queue();
ACE_DEBUG((LM_DEBUG,"Creating laxity q\n"));
break;
case 'd':
mq=ACE_Message_Queue_Factory<ACE_NULL_SYNCH>:: create_deadline_message_queue();
ACE_DEBUG((LM_DEBUG,"Creating deadline q\n"));
break;
case 's':
mq=ACE_Message_Queue_Factory<ACE_NULL_SYNCH>:: create_static_message_queue();
ACE_DEBUG((LM_DEBUG,"Creating static q\n"));
break;
case 'h':
hwm=ACE_OS::atoi(get_opts.optarg);
mq->high_water_mark(hwm);
ACE_DEBUG((LM_INFO,"High Water Mark %d msgs \n",hwm));
break;
case 'l':
lwm=ACE_OS::atoi(get_opts.optarg);
mq->low_water_mark(lwm);
ACE_DEBUG((LM_INFO,"Low Water Mark %d msgs \n",lwm));
break;
default:
ACE_DEBUG((LM_ERROR,"Usage specify queue type\n"));
break;
}
}

private:
int opt;
int hwm;
int lwm;
};

class QTest{
public:
QTest(int argc, char*argv[]){
args_ = new Args(argc,argv,no_msgs_,time_,mq_);
array_ =new ACE_Message_Block*[no_msgs_];
}

int start_test(){
for(int i=0; i<no_msgs_;i++){
ACE_NEW_RETURN (array_[i], ACE_Message_Block (1), -1);
set_deadline(i);
set_execution_time(i);
enqueue(i);
}

this->dequeue_all();
return 0;
}

//Call the underlying ACE_Message_Block method msg_deadline_time() to set the deadline of the message.
void set_deadline(int msg_no){
float temp=(float) time_/(msg_no+1);
ACE_Time_Value tv;
tv.set(temp);
ACE_Time_Value deadline(ACE_OS::gettimeofday()+tv);
array_[msg_no]->msg_deadline_time(deadline);
ACE_DEBUG((LM_INFO,"EQd with DLine %d:%d\n", deadline.sec(),deadline.usec()));
}

//Call the underlying ACE_Message_Block method to set the execution time
void set_execution_time(int msg_no){
float temp=(float) time_/10*msg_no;
ACE_Time_Value tv;
tv.set(temp);
ACE_Time_Value xtime(ACE_OS::gettimeofday()+tv);
array_[msg_no]->msg_execution_time (xtime);
ACE_DEBUG((LM_INFO,"Xtime %d:%d\n",xtime.sec(),xtime.usec()));
}

void enqueue(int msg_no){
//Set the value of data at the read position
*array_[msg_no]->rd_ptr()=msg_no;
//Advance write pointer
array_[msg_no]->wr_ptr(1);
//Enqueue on the message queue
if(mq_->enqueue_prio(array_[msg_no])==-1){
ACE_DEBUG((LM_ERROR,"\nCould not enqueue on to mq!!\n"));
return;
}
ACE_DEBUG((LM_INFO,"Data %d\n",*array_[msg_no]->rd_ptr()));
}

void dequeue_all(){
ACE_DEBUG((LM_INFO,"Beginning DQ \n"));
ACE_DEBUG((LM_INFO,"No. of Messages on Q:%d Bytes on Q:%d \n", mq_->message_count(),mq_->message_bytes()));
for(int i=0;i<no_msgs_ ;i++){
ACE_Message_Block *mb;
if(mq_->dequeue_head(mb)==-1){
ACE_DEBUG((LM_ERROR,'\nCould not dequeue from mq!!\n"));
return;
}
ACE_DEBUG((LM_INFO,"DQd data %d\n",*mb->rd_ptr()));
}
}
private:
Args *args_;
ACE_Message_Block **array_;
ACE_Message_Queue<ACE_NULL_SYNCH> *mq_;
int no_msgs_;
int time_;
};

int main(int argc, char* argv[]){
QTest test(argc,argv);
if(test.start_test()<0)
ACE_DEBUG((LM_ERROR,"Program failure \n"));
}