Java/Scala multi-threading issue for a web service

Question

In a web service environment, I want to make a few independent http calls per each request that my application receives. As these calls are independent, it doesn't make sense to make them serially so I need a sort of concurrency.

To my understanding, it doesn't make sense to carelessly create new threads for each http call. And also, recreating all these threads brings a lot of overhead.

So I think my best option would be to create a FixedThreadPool in a singleton for all http calls and use that across the application.

Is this the best choice?

Are you using any particular web-server? Most web-servers will do this for you. For instance, Tomcat already has a fixed thread pool, and will allocate threads from that pool for each request. — rodion
– rodion, Commented Jan 22, 2011 at 8:51
Having a FixedThreadPool (OR any concurrency util) for making Http service call is a huge overkill. Why do you want to perform threading for an operation like this. — billygoat
– billygoat, Commented Jan 22, 2011 at 8:55
@doc_180: I'm new to concurrency so please shoot your alternatives. — parsa
– parsa, Commented Jan 22, 2011 at 8:58
@rodion: I'm using Jetty, and what I observe is that calls are made serially. — parsa
– parsa, Commented Jan 22, 2011 at 8:59
Hmmm, Tomcat allocating fixed thread pool does not happen in the client side, does it? I believe he is trying to create a Rest Client and wants to make http calls using FixedThreadPool. If its very important, I will use a framework like Spring REST Template to implement my client.) — billygoat
– billygoat, Commented Jan 22, 2011 at 9:01

David · Accepted Answer · 2011-01-22 10:22:04Z

4

You should take a serious look at Akka, and specifically, the Camel support it offers.

answered Jan 22, 2011 at 10:22

David

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denis phillips · Accepted Answer · 2011-01-22 21:08:14Z

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You may want to consider using the AsyncHttpClient AsyncHttpClient library for very easy asynchronous http calls. A good series of blog posts that describes how to use this library is Going Asynchronous using AsyncHttpClient

answered Jan 22, 2011 at 21:08

denis phillips

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