fix: state controller name in exception (#1002)

Fixes #1001

Author: metacosm

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

@@ -129,12 +129,14 @@ public final void registerEventSource(EventSource eventSource)
     } catch (IllegalStateException | MissingCRDException e) {
       throw e; // leave untouched
     } catch (Exception e) {
-      throw new OperatorException("Couldn't register event source: " + eventSource.name(), e);
+      throw new OperatorException("Couldn't register event source: " + eventSource.name() + " for "
+          + controller.getConfiguration().getName() + " controller`", e);
     } finally {
       lock.unlock();
     }
   }
 
+  @SuppressWarnings("unchecked")
   public void broadcastOnResourceEvent(ResourceAction action, R resource, R oldResource) {
     for (var eventSource : eventSources) {
       if (eventSource instanceof ResourceEventAware) {
@@ -211,8 +213,8 @@ public Iterator<EventSource> iterator() {
     }
 
     public Set<EventSource> all() {
-      return new LinkedHashSet<>(sources.values().stream().flatMap(Collection::stream)
-          .collect(Collectors.toList()));
+      return sources.values().stream().flatMap(Collection::stream)
+          .collect(Collectors.toCollection(LinkedHashSet::new));
     }
 
     public void clear() {
@@ -236,6 +238,7 @@ public void add(EventSource eventSource) {
       sources.computeIfAbsent(keyFor(eventSource), k -> new ArrayList<>()).add(eventSource);
     }
 
+    @SuppressWarnings("rawtypes")
     private Class<?> getDependentType(EventSource source) {
       return source instanceof ResourceEventSource
           ? ((ResourceEventSource) source).getResourceClass()
@@ -265,6 +268,7 @@ private String keyFor(Class<?> dependentType) {
       return key;
     }
 
+    @SuppressWarnings("unchecked")
     public <S> ResourceEventSource<R, S> get(Class<S> dependentType, String name) {
       final var sourcesForType = sources.get(keyFor(dependentType));
       if (sourcesForType == null || sourcesForType.isEmpty()) {