Add GraphProperties and property caching

src/graph/print.jl

@@ -58,12 +58,12 @@ function show(io::IO, graph::DAG)
     end
     println(io)
     println(io, "  Edges: ", noEdges)
-    properties = graph_properties(graph)
-    println(io, "  Total Compute Effort: ", properties.compute_effort)
+    properties = get_properties(graph)
+    println(io, "  Total Compute Effort: ", properties.computeEffort)
     println(io, "  Total Data Transfer: ", properties.data)
     return println(
         io,
         "  Total Compute Intensity: ",
-        properties.compute_intensity,
+        properties.computeIntensity,
     )
 end

src/graph/properties.jl

@@ -1,31 +1,17 @@
 """
-    graph_properties(graph::DAG)
+    get_properties(graph::DAG)
 
-Return the graph's properties, a named tuple with fields `.data`, `.compute_effort`, `.compute_intensity`, `.nodes` (number of nodes) and `.edges` (number of edges).
+Return the graph's [`GraphProperties`](@ref).
 """
-function graph_properties(graph::DAG)
+function get_properties(graph::DAG)
     # make sure the graph is fully generated
     apply_all!(graph)
 
-    d = 0
-    ce = 0
-    ed = 0
-    for node in graph.nodes
-        d += data(node.task) * length(node.parents)
-        ce += compute_effort(node.task)
-        ed += length(node.parents)
+    if (graph.properties.computeEffort == 0.0)
+        graph.properties = GraphProperties(graph)
     end
 
-    ci = ce / d
-
-    result = (
-        data = d,
-        compute_effort = ce,
-        compute_intensity = ci,
-        nodes = length(graph.nodes),
-        edges = ed,
-    )
-    return result
+    return graph.properties
 end
 
 """

src/graph/type.jl

@@ -41,6 +41,9 @@ mutable struct DAG
     # "snapshot" system: keep track of added/removed nodes/edges since last snapshot
     # these are muted in insert_node! etc.
     diff::Diff
+
+    # the cached properties of the DAG
+    properties::GraphProperties
 end
 
 """
@@ -69,5 +72,6 @@ function DAG()
         PossibleOperations(),
         Set{Node}(),
         Diff(),
+        GraphProperties(),
     )
 end