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perspective

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An event sourcing library based upon asynchronously generated perspectives

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perspective lib perspective domain_node domain_node.ex
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lib/perspective/domain_node/domain_node.ex 

defmodule Perspective.DomainNode do

  @callback apply_event(struct, struct) :: {:ok, struct}



  defmodule EventApplier do

    def apply_event(%node_type{} = node, event) do

      node_type.apply_event(node, event)

    end

  end



  defmacro __using__(_) do

    quote do

      @behaviour Perspective.DomainNode



      def apply_event(node, event) do

        raise "The node (#{node.__struct__}) and event (#{event.__struct__}) provided do not have an associated matcher"

      end



      defoverridable apply_event: 2

    end

  end

end