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public interface Context<C extends Context<C>>
The context to hold intermediate result of an aggregation. For example, to calculate arithmetic average, we need to accumulate SUM and COUNT. It is provable that if an aggregation over a collection is order independent and its computation can be carried out via a context data type with a binary operator, then the context can also be merged from contexts over a partition of the original collection.
Method Summary | |
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void |
add(java.lang.Object item)
Add an item into the aggregation. |
void |
merge(C ctx)
Merge from another context of the same type. |
Method Detail |
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void add(java.lang.Object item)
void merge(C ctx)
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