Archives
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CEP Style Sliding windows in the RX – Take 2
The bug I mentioned in my first attempt at a sliding window was the minor issue that the aggegates never went down to 0, even if the window had emptied out.
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Sliding Windows via the Reactive Framework
A few months ago, playing with CTP 2 of StreamInsight, I created a small VWAP demo on a sliding window. Now that a proper CTP of the RX is available, I wanted to see how much effort the same demo would be without the CEP infrastructure of StreamInsight. I’ll admit that this was a little bit harder to write then I expected – and there’s still at least one bug remaining (updated) , but the code for actually computing the VWAPS feels much cleaner in the RX version then it did in the StreamInsight version. The debugability (which is really about transparency) of RX is a welcome difference to most CEP systems.
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Reactive Framework available from DevLabs
Downloads of the Reactive Framework (RX) can now be found at MS DevLabs. Versions for 3.5 SP1, 4.0 Beta, and Silverlight 3 are available. Interestingly, the API size appears to be substantially larger than the preview which was leaked as part of the Silverlight 3 Toolkit. That DLL was all of 84KB, the current release is weighs in at 283KB.