1 files changed, 59 insertions, 0 deletions
diff --git a/system/common/handler.h b/system/common/handler.h
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+++ b/system/common/handler.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * 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 <functional>
+#include <memory>
+#include <mutex>
+#include <queue>
+
+#include "common/thread.h"
+#include "common/utils.h"
+
+namespace bluetooth {
+namespace common {
+
+// A message-queue style handler for reactor-based thread to handle incoming events from different threads. When it's
+// constructed, it will register a reactable on the specified thread; when it's destroyed, it will unregister itself
+// from the thread.
+class Handler {
+ public:
+  // Create and register a handler on given thread
+  explicit Handler(Thread* thread);
+
+  // Unregister this handler from the thread and release resource. Unhandled events will be discarded and not executed.
+  ~Handler();
+
+  DISALLOW_COPY_AND_ASSIGN(Handler);
+
+  // Enqueue a closure to the queue of this handler
+  void Post(Closure closure);
+
+  // Remove all pending events from the queue of this handler
+  void Clear();
+
+ private:
+  std::queue<Closure> tasks_;
+  Thread* thread_;
+  int fd_;
+  Reactor::Reactable* reactable_;
+  mutable std::mutex mutex_;
+  void handle_next_event();
+};
+
+}  // namespace common
+}  // namespace bluetooth