Snippets tagged asynchronous
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Asynchronous sequences
An asynchronous sequence is similar to the seq
109 people like thistype, but the elements of the sequence are generated asynchronously without blocking the caller as in Async . This snippet declares asynchronous sequence and uses it to compare two files in 1k blocks.
Like the snippet!Posted: 13 years ago by Tomas Petricek
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Synchronous, event-based and asynchronous HTTP proxy
This snippet shows the implementation of three HTTP proxy servers in F#. The first is written using simple synchronous style (that isn't scalable). The second version uses event-based approach in the Node.js style, but is difficult to write. The third version uses F# async workflows and is both scalable and easy to write.
7 people like this
Like the snippet!Posted: 12 years ago by Tomas Petricek
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AsyncSeq - Introduction and Crawler
This snippet demonstrates programming using asynchronous sequences. It contains (hidden) implementation of AsyncSeq type and combinators for working with it. More importantly, it demonstrates how to use asynchronous sequences to implement a simple sequential on-demand crawler.
10 people like this
Like the snippet!Posted: 12 years ago by Tomas Petricek
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Caching agent
Agent that keeps a cache of web pages that were downloaded previously. The agent handles messages to add and get data as well as message to clear the cache.
6 people like this
Like the snippet!Posted: 12 years ago by Tomas Petricek
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Receive-only SMTP server
An agent is used to act as SMTP server and receive emails. Another agent receives emails from the SMTP server and also responds to requests for all emails received. A type is exposed that wraps this behaviour in a single method to get the list of emails.
5 people like this
Like the snippet!Posted: 8 years ago by Nick Lydon
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Timed CEs for both synchronous and asynchronous workflows
Convenient CEs that allow you to measure how long it takes to execute a given content.
5 people like this
Like the snippet!Posted: 2 years ago by Natalie Perret
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Simple asynchronous functions
The snippet demonstrates how to compose simple asynchronous functions and how to use try .. with to handle exceptions in asynchronous workflows.
35 people like this
Like the snippet!Posted: 13 years ago by Tomas Petricek
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Asynchronous HTTP proxy with chunking and caching
This snippet shows two improvements to asynchronous HTTP proxy from: http://fssnip.net/6e. First extension is to process page in chunks (instead of downloading the entire content first). The second extension is to use simple agent-based in-memory cache for previously visited pages.
7 people like this
Like the snippet!Posted: 12 years ago by Tomas Petricek
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Download stock prices as async sequence
The snippet uses asynchronous sequences (from F# AsyncExtensions) to download historical stock data from Yahoo. Data is downloaded in a buffered way on demand (as needed) and returned line by line. The sample then prints OHLC values for first 30 items.
6 people like this
Like the snippet!Posted: 12 years ago by Tomas Petricek
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Async.Sleep with immediate cancellation
Implementation of Async.Sleep in f# 2.0 doesn't allow break it execution until the time elapsed. Here is the alternate implementation which support immediate cancellation. According to discussion http://stackoverflow.com/questions/9041491/is-there-any-reason-why-async-sleep-can-not-be-canceled-immediately .
2 people like this
Like the snippet!Posted: 12 years ago by Andrei Kolomentsev
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Walkthrough: Creating an Asynchronous HTTP Handler
The Microsoft tutorial Walkthrough: Creating an Asynchronous HTTP Handler did not describe how to use IHttpAsyncHandler from F#.
5 people like this
It was also a bit complicated, because it did not show how to do it from Visual Studio. Here is the Visual Studio F# version. 1. Create empty ASP.NET Web Application. Call it FSharpHttpAsyncHandler. 2. Add a F# library project to the solution. Call it FSharpHttpAsyncHandler.Lib. 3. Add the following code to Library1.fs in FSharpHttpAsyncHandler.Lib 4. Add a reference to System.Web in FSharpHttpAsyncHandler.Lib 5. Add a reference to FSharpHttpAsyncHandler.Lib in FSharpHttpAsyncHandler. 6. Add the following to Web.config in FSharpHttpAsyncHandler. 7. In the Web tab of the project properties of FSharpHttpAsyncHandler, set Start url to http://localhost://whatever.SampleAsync 8. Run debug.
Like the snippet!Posted: 6 years ago by Erling Hellenäs