Mike`s Blog

I've been playing around recently regarding visualization of dataflow in Java applications. It seems that there are tons of tools to inspect the control flow, but I had no luck yet finding something which can visualize the amount of data and the type of data flowing through complex systems.

Not being an AOP guru, i wondered if there was something else to use. Something, which is unobtrusive and can be applied to existing systems. The first thing i'm trying is Java's Debugging APIs, namely JDI, to automatically step through a program and record method entries.

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What happens in the first minute after you tweet?

When you post an update to your Twitter status (engl. to tweet) which contains a URL, there is going to be some automated reaction from the network. Let's examine what happens after I've tweeted the following:



The first thing happening within seconds is that Twitter's own bot (Twitterbot/0.1) performs a request to see if the URL is valid. The IP 128.242.241.133 is hosted at dedicatedserver.com, an NTT company located in San Jose. The data center seems to be the same where Twitter itself is hosted. They do not retrieve the contents (they're using the HEAD command instead of GET), perhaps to resolve redirects from shortened URLs.

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