Release based on cl/313536507.

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

cpp/platform_v2/public/multi_thread_executor.h

@@ -0,0 +1,42 @@
+// 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_PUBLIC_MULTI_THREAD_EXECUTOR_H_
+#define PLATFORM_V2_PUBLIC_MULTI_THREAD_EXECUTOR_H_
+
+#include "platform_v2/api/platform.h"
+#include "platform_v2/public/submittable_executor.h"
+
+namespace location {
+namespace nearby {
+
+// An Executor that reuses a fixed number of threads operating off a shared
+// unbounded queue.
+//
+// https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executors.html#newFixedThreadPool-int-
+class MultiThreadExecutor final : public SubmittableExecutor {
+ public:
+  using Platform = api::ImplementationPlatform;
+  explicit MultiThreadExecutor(int max_parallelism)
+      : SubmittableExecutor(
+            Platform::CreateMultiThreadExecutor(max_parallelism)) {}
+  MultiThreadExecutor(MultiThreadExecutor&&) = default;
+  MultiThreadExecutor& operator=(MultiThreadExecutor&&) = default;
+  ~MultiThreadExecutor() override = default;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_PUBLIC_MULTI_THREAD_EXECUTOR_H_