How to send multiple asynchronous requests to different web services?

Question

I need to send multiple requests to many different web services and receive the results. The problem is that, if I send the requests one by one it takes so long as I need to sen

Answer 1

You might consider the following paradigm in which you create work (serially), but the actual work is done in parallel. One way to do this is to: 1) have your "main" create a queue of work items; 2) create a "doWork" object that queries the queue for work to do; 3) have "main" start some number of "doWork" threads (can be same number as number of different services, or a smaller number); have the "doWork" objects put add their results to an object list (whatever construct works Vector, list...).

Each "doWork" object would mark their queue item complete, put all results in the passed container and check for new work (if no more on the queue, it would sleep and try again).

Of course you will want to see how well you can construct your class model. If each of the webservices is quite different for parsing, then you may want to create an Interface that each of your "retrieveinfo" classes promises to implement.