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- Client-side aggregation: The client-side aggregation is implemented in a way that a client request requests a number of objects one by one where each object contains one integer value. Consequently, a read-RPC gets invoked for every object and the client locally computes the sum.
- Server-side aggregation via hashtable lookup: A range of keys is passed to the server and the server performs a lookup in its own hash table for every object. Again, each object contains a single integer which gets added up (as shown in Listing 1). Once the aggregation is done, the resulting sum is sent back to the server via RPC.
- Server-side aggregation via hashTable forEach: The hash table in the MasterServer offers a forEach method that iterates over all object contained in the hash table. A callback can be registered to that method which is shown in Listing 2.
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