EventBase test lib rework

Summary: EventBase test lib rework

Reviewed By: yfeldblum

Differential Revision: D19001877

fbshipit-source-id: d99ad41007012c7bd21ee259a0a0b5ee2b709512

folly/io/async/test/EventBaseTestLibProvider.cpp

+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <folly/io/async/test/EventBaseTestLibProvider.h>
+
+namespace folly {
+namespace test {
+EventBaseBackendProvider::GetBackendFunc
+    EventBaseBackendProvider::getBackendFunc_;
+} // namespace test
+} // namespace folly

folly/io/async/test/EventBaseTestLibProvider.h

+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <folly/Function.h>
+#include <folly/Memory.h>
+#include <folly/io/async/EventBase.h>
+
+namespace folly {
+namespace test {
+class EventBaseBackendProvider {
+ public:
+  EventBaseBackendProvider() = delete;
+  ~EventBaseBackendProvider() = delete;
+  using GetBackendFunc =
+      folly::Function<std::unique_ptr<folly::EventBaseBackendBase>()>;
+  static std::unique_ptr<folly::EventBaseBackendBase> getBackend() {
+    CHECK(!!getBackendFunc_);
+
+    return getBackendFunc_();
+  }
+
+  static void setGetBackendFunc(GetBackendFunc&& func) {
+    getBackendFunc_ = std::move(func);
+  }
+
+ private:
+  static GetBackendFunc getBackendFunc_;
+};
+} // namespace test
+} // namespace folly