fix: On context change (#69)

* add the eventing onContext change to set the provider values as stale, fetch the values and update the cache

* add a test scenario for checking if we get new values after the context update

* docs: update comment

---------

Co-authored-by: Nicklas Lundin <nicklasl@spotify.com>

Provider/src/main/java/dev/openfeature/contrib/providers/ConfidenceFeatureProvider.kt

@@ -60,12 +60,22 @@ class ConfidenceFeatureProvider private constructor(
     }
 
     override fun initialize(initialContext: EvaluationContext?) {
-        if (initialContext == null) return
+        initialContext?.let {
+            internalInitialize(
+                initialContext,
+                initialisationStrategy
+            )
+        }
+    }
 
+    private fun internalInitialize(
+        initialContext: EvaluationContext,
+        strategy: InitialisationStrategy
+    ) {
         // refresh cache with the last stored data
         storage.read()?.let(cache::refresh)
 
-        if (initialisationStrategy == InitialisationStrategy.ActivateAndFetchAsync) {
+        if (strategy == InitialisationStrategy.ActivateAndFetchAsync) {
             eventsPublisher.publish(OpenFeatureEvents.ProviderReady)
         }
 
@@ -84,7 +94,7 @@ class ConfidenceFeatureProvider private constructor(
                     initialContext
                 )
 
-                when (initialisationStrategy) {
+                when (strategy) {
                     InitialisationStrategy.FetchAndActivate -> {
                         // refresh the cache from the stored data
                         cache.refresh(data = storedData)
@@ -108,7 +118,14 @@ class ConfidenceFeatureProvider private constructor(
         newContext: EvaluationContext
     ) {
         if (newContext != oldContext) {
-            initialize(newContext)
+            eventsPublisher.publish(OpenFeatureEvents.ProviderStale)
+
+            // on the new context we want to fetch new values and update
+            // the storage & cache right away which is why we pass `InitialisationStrategy.FetchAndActivate`
+            internalInitialize(
+                newContext,
+                InitialisationStrategy.FetchAndActivate
+            )
         }
     }
 

Provider/src/test/java/dev/openfeature/contrib/providers/ConfidenceFeatureProviderTests.kt

@@ -85,6 +85,9 @@ internal class ConfidenceFeatureProviderTests {
     private val mockClient: ConfidenceClient = mock()
     private val mockContext: Context = mock()
     private val instant = Instant.parse("2023-03-01T14:01:46.645Z")
+    private val blueStringValues = mutableMapOf(
+        "mystring" to Value.String("blue")
+    )
     private val resolvedValueAsMap = mutableMapOf(
         "mystring" to Value.String("red"),
         "myboolean" to Value.Boolean(false),
@@ -313,6 +316,53 @@ internal class ConfidenceFeatureProviderTests {
         assertNull(evalNull.errorCode)
     }
 
+    @Test
+    fun testNewContextFetchValuesAgain() = runTest {
+        val testDispatcher = UnconfinedTestDispatcher(testScheduler)
+        val confidenceFeatureProvider = ConfidenceFeatureProvider.create(
+            context = mockContext,
+            clientSecret = "",
+            cache = InMemoryCache(),
+            client = mockClient,
+            eventsPublisher = EventHandler.eventsPublisher(testDispatcher),
+            dispatcher = testDispatcher
+        )
+
+        val evaluationContext1 = ImmutableContext("foo")
+        val evaluationContext2 = ImmutableContext("bar")
+
+        whenever(mockClient.resolve(eq(listOf()), eq(evaluationContext1))).thenReturn(
+            ResolveResponse.Resolved(
+                ResolveFlags(resolvedFlags, "token1")
+            )
+        )
+
+        val newExpectedValue = resolvedFlags.list[0].copy(value = ImmutableStructure(blueStringValues))
+        whenever(mockClient.resolve(eq(listOf()), eq(evaluationContext2))).thenReturn(
+            ResolveResponse.Resolved(
+                ResolveFlags(Flags(listOf(newExpectedValue)), "token1")
+            )
+        )
+
+        confidenceFeatureProvider.initialize(evaluationContext1)
+        advanceUntilIdle()
+
+        val evalString1 = confidenceFeatureProvider.getStringEvaluation(
+            "test-kotlin-flag-1.mystring",
+            "default",
+            evaluationContext1
+        )
+        assertEquals("red", evalString1.value)
+        confidenceFeatureProvider.onContextSet(evaluationContext1, evaluationContext2)
+        advanceUntilIdle()
+        val evalString2 = confidenceFeatureProvider.getStringEvaluation(
+            "test-kotlin-flag-1.mystring",
+            "default",
+            evaluationContext2
+        )
+        assertEquals("blue", evalString2.value)
+    }
+
     @Test
     fun testApplyOnMultipleEvaluations() = runTest {
         val testDispatcher = UnconfinedTestDispatcher(testScheduler)