Real world use of JMS message queues

Question

I was just reading abit about JMS and Apache ActiveMQ  And was wondering what real world use have people here used JMS or similar message queue technologies for

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JMS  ActiveMQ is a JMS broker implementation  can be used as a mechanism to allow asynchronous request processing   You may wish to do this because the request take a long time to complete or because several parties may be interested in the actual request   Another reason for using it is to allow multiple clients  potentially written in different languages  to access information via JMS   ActiveMQ is a good example here because you can use the STOMP protocol to allow access from a C  Java Ruby client   A real world example is that of a web application that is used to place an order for a particular customer   As part of placing that order  and storing it in a database  you may wish to carry a number of additional tasks    Store the order in some sort of third party back-end system  such as SAP  Send an email to the customer to inform them their order has been placed   To do this your application code would publish a message onto a JMS queue which includes an order id   One part of your application listening to the queue may respond to the event by taking the orderId  looking the order up in the database and then place that order with another third party system   Another part of your application may be responsible for taking the orderId and sending a confirmation email to the customer

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We use it to initiate asynchronous processing that we don t want to interrupt or conflict with an existing transaction   For example  say you ve got an expensive and very important piece of logic like  buy stuff   an important part of buy stuff would be  notify stuff store   We make the notify call asynchronous so that whatever logic processing that is involved in the notify call doesn t block or contend with resources with the buy business logic   End result  buy completes  user is happy  we get our money and because the queue is guaranteed delivery the store gets notified as soon as it opens or as soon as there s a new item in the queue

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Distributed  a synchronous computing  A real world example could be an application-wide notification framework  which sends mails to the stakeholders at various points during the course of application usage  So the application would act as a Producer by create a Message object  putting it on a particular Queue  and moving forward  There would be a set of Consumers who would subscribe to the Queue in question  and would take care handling the Message sent across  Note that during the course of this transaction  the Producers are decoupled from the logic of how a given Message would be handled   Messaging frameworks  ActiveMQ and the likes  act as a backbone to facilitate such Message transactions by providing MessageBrokers

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I ve had so many amazing uses for JMS    Web chat communication for customer service   Debug logging on the backend  All app servers broadcasted debug messages at various levels  A JMS client could then be launched to watch for debug messages  Sure I could ve used something like syslog  but this gave me all sorts of ways to filter the output based on contextual information  e q  by app server name  api call  log level  userid  message type  etc      I also colorized the output  Debug logging to file  Same as above  only specific pieces were pulled out using filters  and logged to file for general logging  Alerting  Again  a similar setup to the above logging  watching for specific errors  and alerting people via various means  email  text message  IM  Growl pop-up      Dynamically configuring and controlling software clusters  Each app server would broadcast a  configure me  message  then a configuration daemon that would respond with a message containing all kinds of config info  Later  if all the app servers needed their configurations changed at once  it could be done from the config daemon   And the usual - queued transactions for delayed activity such as billing  order processing  provisioning  email generation       It s great anywhere you want to guarantee delivery of messages asynchronously

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We are using JMS for communication with systems in a huge number of remote sites over unreliable networks  The loose coupling in combination with reliable messaging produces a stable system landscape  Each message will be sent as soon it is technically possible  bigger problems in network will not have influence on the whole system landscape

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We have used messaging to generate online Quotes

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I have used it for my academic project which was online retail website similar to Amazon  JMS was used to handle following features     Update the position of the orders placed by the customers  as the shipment travels from one location to another  This was done by continuously sending messages to JMS Queue  Alerting about any unusual events like shipment getting delayed and then sending email to customer  If the delivery is reached its destination  sending a delivery event    We had multiple also implemented remote clients connected to main Server  If connection is available  they use to access the main database or if not use their own database  In order to handle data consistency  we had implemented 2PC mechanism  For this  we used JMS for exchange the messages between these systems i e one acting as coordinator who will initiate the process by sending message on the queue and others will respond accordingly by sending back again a message on the queue  As others have already mentioned  this was similar to pub sub model

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Use them all the time to process long-running operations asynchronously   A web user won t want to wait for more than 5 seconds for a request to process   If you have one that runs longer than that  one design is to submit the request to a queue and immediately send back a URL that the user can check to see when the job is finished   Publish subscribe is another good technique for decoupling senders from many receivers   It s a flexible architecture  because subscribers can come and go as needed

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Apache Camel used in conjunction with ActiveMQ is great way to do Enterprise Integration Patterns

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I ve used it to send intraday trades between different fund management systems  If you want to learn more about what a great technology messaging is  I can thoroughly recommend the book  Enterprise Integration Patterns   There are some JMS examples for things like request reply and publish subscribe   Messaging is an excellent tool for integration

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I have seen JMS used in different commercial and academic projects  JMS can easily come into your picture  whenever you want to have a totally decoupled distributed systems  Generally speaking  when you need to send your request from one node  and someone in your network takes care of it without with giving the sender any information about the receiver     In my case  I have used JMS in developing a message-oriented middleware  MOM  in my thesis  where specific types of object-oriented objects are generated in one side as your request  and compiled and executed on the other side as your response

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