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You can use the observer pattern and bucketize the processed messages. And put these buckets in a Fixed length Map. The length of the Map depends on the time resolution. The key of the map is the time rounded off to time resolution. For example, if we take a time resolution of 1 minutes, then we will have a Map of size 10 and the key is number of minutes from epoch.
To get better results, increase the time resolution, say to seconds.
- xdeepak81 March 22, 2014