Release based on cl/313536507.

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I83ec7dee1a7ef6f4bdfd47482c94d03910525b7e

cpp/platform_v2/api/scheduled_executor.h

@@ -0,0 +1,50 @@
+// Copyright 2020 Google LLC
+//
+// 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
+//
+//     https://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.
+
+#ifndef PLATFORM_V2_API_SCHEDULED_EXECUTOR_H_
+#define PLATFORM_V2_API_SCHEDULED_EXECUTOR_H_
+
+#include <cstdint>
+#include <functional>
+#include <memory>
+
+#include "platform_v2/api/cancelable.h"
+#include "platform_v2/api/executor.h"
+#include "platform_v2/base/runnable.h"
+#include "absl/time/time.h"
+
+namespace location {
+namespace nearby {
+namespace api {
+
+// An Executor that can schedule commands to run after a given delay, or to
+// execute periodically.
+//
+// https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ScheduledExecutorService.html
+class ScheduledExecutor : public Executor {
+ public:
+  ~ScheduledExecutor() override = default;
+  // Cancelable is kept both in the executor context, and in the caller context.
+  // We want Cancelable to live until both caller and executor are done with it.
+  // Exclusive ownership model does not work for this case;
+  // using std:shared_ptr<> instead if std::unique_ptr<>.
+  virtual std::shared_ptr<Cancelable> Schedule(Runnable&& runnable,
+                                               absl::Duration duration) = 0;
+};
+
+}  // namespace api
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_API_SCHEDULED_EXECUTOR_H_