feat: added additional cache methods

Author: csviri

operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/internal/ControllerResourceEventSource.java

@@ -196,6 +196,24 @@ public Stream<T> getCachedCustomResources(Predicate<T> predicate) {
     return resStream;
   }
 
+  /**
+   * Use only if the operator is watching specific namespace(s).
+   * @param namespace - namespace to filter on
+   * @return stream of cached resources from the specified namespace
+   */
+  public Stream<T> getCachedCustomResources(String namespace) {
+    return sharedIndexInformers.get(namespace).getStore().list().stream();
+  }
+
+  /**
+   * Use only if the operator is watching specific namespace(s).
+   * @param namespace - namespace to filter on
+   * @return stream of cached resources from the specified namespace
+   */
+  public Stream<T> getCachedCustomResources(String namespace, Predicate<T> predicate) {
+    return sharedIndexInformers.get(namespace).getStore().list().stream().filter(predicate);
+  }
+
   /**
    * @return shared informers by namespace. If custom resource is not namespace scoped use
    *         CustomResourceEventSource.ANY_NAMESPACE_MAP_KEY