Bridge for linking two publish/subscribe message brokers
View Patent ↗There is disclosed a method, computer program and bridge for linking two publish/subscribe message brokers together. A subscription is made to receive request messages on one or more topics from a first broker. A subscription is made to receive all messages published at either the first or the second broker to a replyto topic including a bridge identifier. A request message is received from the first broker, the request message specifying a temporary replyto topic on which responses to the request should be published. The temporary reply to topic is modified to specify a bridge identifier. The modified request message is forwarded to a second broker. A response to the request is received from the second broker, the response being published on the replyto topic including the bridge identifier. The bridge receives the response as a result of the subscription to receive all messages published to a topic including the bridge identifier. The response is forwarded to the first broker.
1. A method for a bridge linking two publish/subscribe message brokers together, the method comprising:
subscribing to receive request messages on one or more topics from a first broker;
subscribing to receive all messages published at either the first or the second broker to a replyto topic including a bridge identifier;
receiving a request message from the first broker, the request message specifying a temporary replyto topic on which responses to the request should be published;
modifying the temporary replyto topic to specify a bridge identifier; forwarding the modified request message to a second broker;
receiving a response to the request from the second broker, the response being published on the replyto topic including the bridge identifier, the bridge receiving the response as a result of the subscription to receive all messages published to a topic including the bridge identifier; and
forwarding the response on to the first broker.
2. The method of claim 1 , further comprising the step of:
modifying the response message to refer to the temporary topic in its original unmodified form prior to forwarding the response on to the first broker.
3. The method of claim 1 or 2 comprising:
consulting a mapping table in order to determine where to forward a message to.