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by e12e
4149 days ago
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So... the code[1] for Leonardo is certainly short and sweet -- but is this considered a production-grade web server? I doesn't appear to do anything in parallel (no "|" in the code, anyway) -- is this a thin wrapper around something more robust in the Jolie standard lib/run-time? [1] http://sourceforge.net/p/leonardo/code/HEAD/tree/trunk/leona... If not Leonardo -- is there some production-quality, yet simple, code that one could look at to get a feel for how an actual Jolie service might look? Say a micro-blogging site or something? Always interesting to see new languages and platforms! |
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This is the code for the Jolie website if you're curious about an example:
https://sourceforge.net/p/jolie/code/HEAD/tree/web/trunk/jol...
We launch leonardo/leonardo.ol on the server.
The reason for which Leonardo works is that "execution { concurrent }" line which tells Jolie to start a new (light) process whenever a top-level operation is invoked. In this case we have only default, a catch-all operation for serving requests for files. So each time a client invokes Leonardo, a new process handles the request. Jolie processes are implemented as threads (cached in a thread pool when possible) with a local state (no data sharing, only communications).
Notice that in Leonardo we are embedding frontend.ol, which means that it will be run as a sub-service. And we also aggregate it in the HTTP input port, which means that its operations become available to clients. So now clients can not only invoke the catch-all default operation, but also the operations in frontend.ol.
Looking at frontend.ol, you will find one of these operation, e.g., "news". That's what you access when you go to http://www.jolie-lang.org/news
What does it do? It uses another sub-(micro)service, a blog reader, to fetch blog entries from our news blog, and then displays it to the user.
It's all a bit crude, in the enterprise we don't usually build html from scratch, but the Jolie website was so simple that we just went for it.