ALlow emptying of cache on recoplan

Author: nHackel

src/RecoPlans/Cache.jl

@@ -115,10 +115,11 @@ end
 
 """
     empty!(cache::ProcessResultCache)
+    empty!(plan::RecoPlan{ProcessResultCache})
 
 Empty the cache of the `ProcessResultCache`
 """
-Base.empty!(cache::ProcessResultCache) = empty!(cache.cache)
+Base.empty!(cache::Union{ProcessResultCache, RecoPlan{<:ProcessResultCache}}) = empty!(cache.cache)
 """
     resize!(cache::ProcessResultCache)
 

test/caching.jl

@@ -171,14 +171,24 @@
 
   @testset "RecoPlan" begin
     cache_misses = Ref(0)
-    cached_parameter = CacheableParameter(3, cache_misses)
+    cached_parameter = PureCacheableParameter(3, cache_misses)
     cache = ProcessResultCache(; param = cached_parameter, maxsize = 1)
 
     plan = toPlan(cache)
     setAll!(plan, :maxsize, 3)
     @test plan.cache.maxsize == 3
 
-    clear!(plan.param)
+    process(CacheableAlgorithm, cache, 42)
+    @test length(keys(cache.cache)) == 1
+    empty!(cache)
+    @test length(keys(cache.cache)) == 0
+    process(CacheableAlgorithm, cache, 42)
+    @test plan.cache == cache.cache
+    @test length(keys(cache.cache)) == 1
+    empty!(plan)
+    @test length(keys(cache.cache)) == 0
+
+    clear!(plan)
     io = IOBuffer()
     toTOML(io, plan)
     seekstart(io)