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diff --git a/libtransport/src/utils/event_reactor.h b/libtransport/src/utils/event_reactor.h
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+++ b/libtransport/src/utils/event_reactor.h
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+/*
+ * Copyright (c) 2017-2019 Cisco and/or 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 <cstddef>
+#include <functional>
+#include <system_error>
+
+namespace utils {
+
+typedef std::function<void(const std::error_code &ec)> UserCallback;
+
+class EventReactor {
+ public:
+  virtual ~EventReactor() = default;
+
+  virtual void runEventLoop(int timeout = -1) = 0;
+
+  virtual void runOneEvent() = 0;
+
+  virtual void stop() = 0;
+};
+
+}  // namespace utils