How to get the number of consumers connected to the Websphere MQ queue from Java

Question

Am I trying to get the number of consumers of a specific Websphere MQ queue from Java? I need to know if someone will consume messages before queuing them.

Answer 1

Firstly, it is worth noting that the proposed design is a very VERY poor design. The effect is to turn asynchronous messaging into synchronous messaging. These message makers for couples inform consumers, introduce location and resolution dependencies, break clustering, lose load balancing and WMQ balancing, inject the network topology into the application and make the whole system fragile. Please do not blame WMQ for malfunctioning after deliberately defeating all of its best features, except for actual queue / deactivation operations.

However, to more accurately answer your question, use the getOpenInputCountqueue object method to get the number of open input descriptors. Here's how:

MQQueue outQ = qMgr.accessQueue(qName,
                                openOptions,
                                null,           // default q manager
                                null,           // no dynamic q name
                                null);          // no alternate user id

int inCount = outQ.getOpenInputCount(); 

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