ibm mq - Connecting IBM MQ queue using F5 virtual ip and C++ -


i trying connect ibm mq queues using c++. these queues have been defined under different manager queues in different servers. idea connect vip balance workload pointing each server.

the problem have using cmqc.h libraries, , in order connect have make use of mqconn or mqconnx, need queue manager name, cannot know @ moment of connection don´t know 1 used due f5 balancer.

the code using example following:

#include <cmqc.h> #include <cmqxc.h>  #include <string.h> #include <stdio.h> #include <sstream> #include <stdlib.h> int main() {     mqhconn connectionhandle;     mqhobj m_sourcequeue;     mqlong completioncode = 0;     mqlong reasoncode = 0;      setenv("mqserver","system.def.svrconn/tcp/<server_ip_address>(56245)",1);     mqconn(<queue_manager_name>, &connectionhandle, &completioncode, &reasoncode);       if(mqcc_ok != completioncode)     {                     printf ("%s \n", "error");         printf ("%s %d \n", "completion code", completioncode);         printf ("%s %d \n", "reason code", reasoncode);     }     mqdisc(&connectionhandle, &completioncode, &reasoncode); }

does have idea how connect queue when queue manager name not available?

based on code provide can use null, or blanks, or * instead of queue manager name.

for example:

mqconn("", &connectionhandle, &completioncode, &reasoncode);  mqconn(" ", &connectionhandle, &completioncode, &reasoncode);  mqconn("*", &connectionhandle, &completioncode, &reasoncode);

any of above connect queue manager listening on host , port specify in mqserver environment variable.

mqconn documented in ibm mq knowledge center page mqconn - connect queue manager. quoting few things related queue manager name page:

if name consists entirely of blanks, the name of default queue manager used.

in case of mqserver default queue manager 1 listening on host , port connected to.

the page has following in context of ccdt works same mqserver:

if all-blank name specified, each client-connection channel all-blank queue-manager name tried until 1 successful; in case there no check against actual name of queue manager.

prefixing asterisk connection name implies application not depend on connecting particular queue manager in group. suitable applications are:

  • applications put messages not messages.
  • applications put request messages , reply messages temporary dynamic queue.

unsuitable applications ones need messages particular queue @ particular queue manager; such applications must not prefix name asterisk.

i suggest instead use ccdt (client channel definition table) provides more flexibility. mqserver can provide host, port, , channel name. ccdt allow configure many more options, example tls, security exits, max message length name few.


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