CODEWITHSUNDEEP
ibm-mq
RLe
RLe

Reputation: 486

How to check if MQ is connected

I'm trying to connect to my MQ servers. I have 2 MQ Server: server 1 and server 2 and set it as connectionNameList for mqConnectionFactory. Is there a way for MQ to connect to server 1 if server 2 failed? How can I know if MQ server is connected? I saw that there is clientReconnectOptions set to 67108864 but I'm not sure what is that.

Upvotes: 2

Views: 4978

Answers (1)

JoshMc
JoshMc

Reputation: 10672

The possible settings for ClientReconnectOptions are documented in the IBM MQ Knowledge center page CLIENTRECONNECTOPTIONS

Below is an example using setClientReconnectOptions to set it so the application can reconnect to any queue manager listing on the two host(port) combinations set in the connectionNameList.

MQQueueConnectionFactory factory = new MQQueueConnectionFactory();

factory.setQueueManager("QMNAME");
factory.setChannel("SVRCONN.CHL");
factory.setConnectionNameList("hostName1(port),hostName2(port)");
factory.setClientReconnectOptions( WMQConstants.WMQ_CLIENT_RECONNECT );

// Set the amount of time you will attempt to reconnect in seconds
factory.setClientReconnectTimeout( 43200 ); //12 hours
//default is 1800 seconds
//factory.setClientReconnectTimeout(WMQConstants.WMQ_CLIENT_RECONNECT_TIMEOUT_DEFAULT);

Note that clients will not always attempt to reconnect, see the following from the endmqm man page on Linux:

If you issue endmqm to stop a queue manager, reconnectable clients do not try to reconnect. To override this behavior, specify either the -r or -s option to enable clients to start trying to reconnect.

Note: If a queue manager or a channel ends unexpectedly, reconnectable clients start trying to reconnect.

Upvotes: 1

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