feat: Change fractional custom op from percentage-based to relative weighting. #828

Signed-off-by: Simon Schrottner <[email protected]>

Author: aepfli

providers/flagd/src/main/java/dev/openfeature/contrib/providers/flagd/resolver/process/targeting/Fractional.java

@@ -51,23 +51,16 @@ public Object evaluate(List arguments, Object data) throws JsonLogicEvaluationEx
 
         final List<FractionProperty> propertyList = new ArrayList<>();
 
-        double distribution = 0;
         try {
             for (Object dist : distibutions) {
                 FractionProperty fractionProperty = new FractionProperty(dist);
                 propertyList.add(fractionProperty);
-                distribution += fractionProperty.getPercentage();
             }
         } catch (JsonLogicException e) {
             log.debug("Error parsing fractional targeting rule", e);
             return null;
         }
 
-        if (distribution != 100) {
-            log.debug("Fractional properties do not sum to 100");
-            return null;
-        }
-
         // find distribution
         return distributeValue(bucketBy, propertyList);
     }

providers/flagd/src/test/java/dev/openfeature/contrib/providers/flagd/resolver/process/targeting/FractionalTest.java

@@ -151,7 +151,7 @@ void targetingBackedFractional() throws JsonLogicEvaluationException {
 
 
     @Test
-    void invalidRuleSumNot100() throws JsonLogicEvaluationException {
+    void invalidRuleSumGreater100() throws JsonLogicEvaluationException {
         // given
         Fractional fractional = new Fractional();
 
@@ -189,7 +189,49 @@ void invalidRuleSumNot100() throws JsonLogicEvaluationException {
         Object evaluate = fractional.evaluate(rule, data);
 
         // then
-        assertNull(evaluate);
+        assertEquals("blue", evaluate);
+    }
+
+    @Test
+    void invalidRuleSumlower100() throws JsonLogicEvaluationException {
+        // given
+        Fractional fractional = new Fractional();
+
+        /* Rule
+         *     [
+         *       [
+         *         "blue",
+         *         50
+         *       ],
+         *       [
+         *         "green",
+         *         30
+         *       ]
+         *     ]
+         * */
+
+        final List<Object> rule = new ArrayList<>();
+
+        final List<Object> bucket1 = new ArrayList<>();
+        bucket1.add("blue");
+        bucket1.add(50);
+
+        final List<Object> bucket2 = new ArrayList<>();
+        bucket2.add("green");
+        bucket2.add(70);
+
+        rule.add(bucket1);
+        rule.add(bucket2);
+
+        Map<String, String> data = new HashMap<>();
+        data.put(FLAG_KEY, "headerColor");
+        data.put(TARGET_KEY, "[email protected]");
+
+        // when
+        Object evaluate = fractional.evaluate(rule, data);
+
+        // then
+        assertEquals("blue", evaluate);
     }
 
     @Test
@@ -266,4 +308,4 @@ void invalidRule() throws JsonLogicEvaluationException {
         assertNull(evaluate);
     }
 
-}
+}