Hands-On Software Engineering with Golang

Registering and looking up aggregators

To facilitate efficient name-based aggregator lookups, Graph instances store aggregators in a map where the aggregator name is used as a key. New aggregator instances can be linked to a Graph instance through the RegisterAggregator method:

func (g *Graph) RegisterAggregator(name string, aggr Aggregator) { 
    g.aggregators[name] = aggr 
}

Compute functions that need access to a particular aggregator can invoke the Aggregator method to look up a registered aggregator instance by name:

func (g *Graph) Aggregator(name string) Aggregator { 
    return g.aggregators[name] 
}

In an effort to make it easier for clients to create snapshots of the graph's state, we will also be providing the auxiliary Aggregators method, ...