SCondi: A Smart Context Distribution Framework Based on a Messaging Service for the Internet of Things

Algorithm 2

Example of filter chain.

⋯

FilterChain =

                 Channel.getFilterChain(CurrentWeight)

FilterChain.addFirst(new AverageFilter(10));

FilterChain.addLast(new ChangedValueFilter());

⋯

class AverageFilter

implemented Filter

⋯ ⋯

       Object execute(Object c)

             sum += c;

             if (checkCount())

                 result = sum/avgCount;

                 init();

                 return nextFilter.execute(result);

⋯ ⋯

class ChangedValueFilter

implemented Filter

⋯ ⋯

       Object execute(Object c)

             old = cur;

             cur = c;

             if (isChanged() == true)

                 return nextFilter.execute(cur);

             ⋯