implement example

examples/postly/lib/presentation/bloc/post_bloc.dart

@@ -0,0 +1,38 @@
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+import '../../domain/entity/post.dart';
+import '../../domain/repository/post_repository.dart';
+
+part 'post_bloc.freezed.dart';
+
+@freezed
+class PostEvent with _$PostEvent {
+  const factory PostEvent.fetchAll() = _FetchAll;
+}
+
+@freezed
+class PostState with _$PostState {
+  const factory PostState.initial() = _Initial;
+  const factory PostState.loading() = _Loading;
+  const factory PostState.loaded(List<Post> posts) = _Loaded;
+  const factory PostState.failure(String message) = _Failure;
+}
+
+class PostBloc extends Bloc<PostEvent, PostState> {
+  final PostRepository repository;
+
+  PostBloc(this.repository) : super(const PostState.initial()) {
+    on<PostEvent>((event, emit) async {
+      await event.map(
+        fetchAll: (e) async {
+          emit(const PostState.loading());
+          final result = await repository.getPosts();
+          result.fold(
+            (l) => emit(PostState.failure(l.toString())),
+            (r) => emit(PostState.loaded(r)),
+          );
+        },
+      );
+    });
+  }
+}