Update component runtime to pick up any one of the couroutine dispatcher interface (#5300)

Author: VinayGuthal

firebase-components/CHANGELOG.md

@@ -1,3 +1,7 @@
 # Unreleased
+* [changed] Internal changes to ensure only one interface is provided for 
+   kotlinx.coroutines.CoroutineDispatcher interfaces when both firebase-common and
+   firebase-common-ktx provide them.
+
 
 

firebase-components/src/main/java/com/google/firebase/components/ComponentRuntime.java

@@ -49,6 +49,7 @@ public class ComponentRuntime implements ComponentContainer, ComponentLoader {
   private final Map<Qualified<?>, Provider<?>> lazyInstanceMap = new HashMap<>();
   private final Map<Qualified<?>, LazySet<?>> lazySetMap = new HashMap<>();
   private final List<Provider<ComponentRegistrar>> unprocessedRegistrarProviders;
+  private Set<String> processedCoroutineDispatcherInterfaces = new HashSet<>();
   private final EventBus eventBus;
   private final AtomicReference<Boolean> eagerComponentsInitializedWith = new AtomicReference<>();
   private final ComponentRegistrarProcessor componentRegistrarProcessor;
@@ -123,6 +124,25 @@ private void discoverComponents(List<Component<?>> componentsToAdd) {
         }
       }
 
+      // kotlinx.coroutines.CoroutineDispatcher interfaces could be provided by both new version of
+      // firebase-common and old version of firebase-common-ktx. In this scenario take the first
+      // interface which was provided.
+
+      Iterator<Component<?>> it = componentsToAdd.iterator();
+      while (it.hasNext()) {
+        Component component = it.next();
+        for (Object anInterface : component.getProvidedInterfaces().toArray()) {
+          if (anInterface.toString().contains("kotlinx.coroutines.CoroutineDispatcher")) {
+            if (processedCoroutineDispatcherInterfaces.contains(anInterface.toString())) {
+              it.remove();
+              break;
+            } else {
+              processedCoroutineDispatcherInterfaces.add(anInterface.toString());
+            }
+          }
+        }
+      }
+
       if (components.isEmpty()) {
         CycleDetector.detect(componentsToAdd);
       } else {