Roll forward to cl/314747126

Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: Ie19e006429b138b3768e97dae971a43fdc5ef8bf
2026-09-16 07:36:10 -04:00 · 2020-06-04 13:50:45 -07:00
parent de31c27947
commit 4baa1ce96a
365 changed files with 28586 additions and 1503 deletions
@@ -0,0 +1,108 @@
+// 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_IMPL_G3_SETTABLE_FUTURE_IMPL_H_
+#define PLATFORM_IMPL_G3_SETTABLE_FUTURE_IMPL_H_
+
+#include <utility>
+
+#include "platform/api/platform.h"
+#include "platform/api/settable_future.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/time/clock.h"
+#include "absl/types/any.h"
+
+namespace location {
+namespace nearby {
+namespace platform {
+
+class SettableFutureImpl : public SettableFuture<absl::any> {
+ public:
+  explicit SettableFutureImpl() = default;
+  ~SettableFutureImpl() override = default;
+
+  bool set(absl::any value) override {
+    absl::MutexLock lock(&mutex_);
+    if (!done_) {
+      value_ = std::move(value);
+      done_ = true;
+      exception_ = {Exception::kSuccess};
+      completed_.SignalAll();
+    }
+    return true;
+  }
+
+  bool setException(Exception exception) override {
+    absl::MutexLock lock(&mutex_);
+    return SetExceptionLocked(exception);
+  }
+
+  void addListener(Ptr<Runnable> runnable, Executor* executor) override {}
+
+  ExceptionOr<std::any> get() override {
+    absl::MutexLock lock(&mutex_);
+    while (!done_) {
+      completed_.Wait(&mutex_);
+    }
+    return exception_.value != Exception::kSuccess
+               ? ExceptionOr<std::any>{exception_.value}
+               : ExceptionOr<std::any>{value_};
+  }
+
+  ExceptionOr<std::any> get(std::int64_t timeout_ms) override {
+    absl::MutexLock lock(&mutex_);
+    absl::Duration timeout = absl::Milliseconds(timeout_ms);
+    while (!done_) {
+      absl::Time start_time = absl::Now();
+      if (completed_.WaitWithTimeout(&mutex_, timeout)) {
+        SetExceptionLocked({Exception::kTimeout});
+        break;
+      }
+      absl::Duration spent = absl::Now() - start_time;
+      if (spent < timeout) {
+        timeout -= spent;
+      } else if (!done_) {
+        SetExceptionLocked({Exception::kTimeout});
+        break;
+      }
+    }
+    return exception_.value != Exception::kSuccess
+               ? ExceptionOr<std::any>{exception_.value}
+               : ExceptionOr<std::any>{value_};
+  }
+
+ private:
+  bool SetExceptionLocked(Exception exception) {
+    if (!done_) {
+      exception_ = exception.value != Exception::kSuccess
+                       ? exception
+                       : Exception{Exception::kFailed};
+      done_ = true;
+      completed_.SignalAll();
+    }
+    return true;
+  }
+
+  absl::Mutex mutex_;
+  absl::CondVar completed_;
+  bool done_{false};
+  absl::any value_;
+  Exception exception_{Exception::kFailed};
+};
+
+}  // namespace platform
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_G3_SETTABLE_FUTURE_IMPL_H_