Roll forward to cl/314747126

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: Ie19e006429b138b3768e97dae971a43fdc5ef8bf

cpp/platform/impl/default/CMakeLists.txt

@@ -1,65 +0,0 @@
-# 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.
-
-add_library(platform_impl_default STATIC)
-
-target_sources(platform_impl_default
-  PRIVATE
-    default_platform.cc
-  PUBLIC
-    default_platform.h
-)
-
-target_include_directories(platform_impl_default
-  PUBLIC
-    ${CMAKE_CURRENT_SOURCE_DIR}
-)
-
-target_link_libraries(platform_impl_default
-  PUBLIC
-    platform_api
-    platform_impl_default_cond_var
-    platform_impl_default_lock
-    platform_types
-)
-
-add_library(platform_impl_default_lock STATIC)
-
-target_sources(platform_impl_default_lock
-  PRIVATE
-    default_lock.cc
-  PUBLIC
-    default_lock.h
-)
-
-target_link_libraries(platform_impl_default_lock
-  PUBLIC
-    platform_api
-)
-
-add_library(platform_impl_default_cond_var STATIC)
-
-target_sources(platform_impl_default_cond_var
-  PRIVATE
-    default_condition_variable.cc
-  PUBLIC
-    default_condition_variable.h
-)
-
-target_link_libraries(platform_impl_default_cond_var
-  PUBLIC
-    platform_api
-    platform_impl_default_lock
-    platform_types
-)

cpp/platform/impl/default/default_platform.h

@@ -1,40 +0,0 @@
-// 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_DEFAULT_DEFAULT_PLATFORM_H_
-#define PLATFORM_IMPL_DEFAULT_DEFAULT_PLATFORM_H_
-
-#include "platform/api/condition_variable.h"
-#include "platform/api/lock.h"
-#include "platform/ptr.h"
-
-namespace location {
-namespace nearby {
-
-// Provides obvious portable implementations of a subset of the hooks specified
-// within //platform/api/.
-//
-// It's highly recommended that custom Platform implementations delegate to
-// these methods unless there's a very good reason not to.
-class DefaultPlatform {
- public:
-  static Ptr<Lock> createLock();
-
-  static Ptr<ConditionVariable> createConditionVariable(Ptr<Lock> lock);
-};
-
-}  // namespace nearby
-}  // namespace location
-
-#endif  // PLATFORM_IMPL_DEFAULT_DEFAULT_PLATFORM_H_

cpp/platform/impl/g3/BUILD

@@ -0,0 +1,41 @@
+# 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.
+
+cc_library(
+    name = "g3",
+    srcs = [
+        "atomic_reference_impl.h",
+        "platform.cc",
+        "settable_future_impl.h",
+        "system_clock_impl.h",
+    ],
+    visibility = [
+        "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
+        "//core:__subpackages__",
+        "//platform:__subpackages__",
+    ],
+    deps = [
+        "//platform:types",
+        "//platform/api",
+        "//platform/impl/shared:atomic_boolean",
+        "//platform/impl/shared:file",
+        "//platform/impl/shared:posix_condition_variable",
+        "//platform/impl/shared:posix_lock",
+        "//platform/port:string",
+        "//absl/base:core_headers",
+        "//absl/synchronization",
+        "//absl/time",
+        "//absl/types:any",
+    ],
+)

cpp/platform/impl/g3/CMakeLists.txt

@@ -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.
+
+add_library(platform_impl_g3 STATIC)
+
+target_sources(platform_impl_g3
+  PRIVATE
+    "atomic_reference_impl.h"
+    "platform.cc"
+    "settable_future_impl.h"
+    "system_clock_impl.h"
+)
+
+target_include_directories(platform_impl_g3
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(platform_impl_g3
+  PUBLIC
+    "platform_types"
+    "platform_api"
+    "platform_impl_shared_atomic_boolean"
+    "platform_impl_shared_file"
+    "platform_impl_shared_posix_condition_variable"
+    "platform_impl_shared_posix_lock"
+    "platform_port_string"
+    "absl::base"
+    "absl::synchronization"
+    "absl::time"
+)

cpp/platform/impl/g3/atomic_reference_impl.h

@@ -0,0 +1,52 @@
+// 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_ATOMIC_REFERENCE_IMPL_H_
+#define PLATFORM_IMPL_G3_ATOMIC_REFERENCE_IMPL_H_
+
+#include "platform/api/atomic_reference.h"
+#include "platform/ptr.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/types/any.h"
+
+namespace location {
+namespace nearby {
+namespace platform {
+
+// Provide implementation for absl::any.
+class AtomicReferenceImpl : public AtomicReference<absl::any> {
+ public:
+  explicit AtomicReferenceImpl(absl::any initial_value)
+      : value_(std::move(initial_value)) {}
+  ~AtomicReferenceImpl() override = default;
+
+  absl::any get() override {
+    absl::MutexLock lock(&mutex_);
+    return value_;
+  }
+  void set(absl::any value) override {
+    absl::MutexLock lock(&mutex_);
+    value_ = std::move(value);
+  }
+
+ private:
+  absl::Mutex mutex_;
+  absl::any value_;
+};
+
+}  // namespace platform
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_G3_ATOMIC_REFERENCE_IMPL_H_

cpp/platform/impl/g3/platform.cc

@@ -0,0 +1,167 @@
+// 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.
+
+#include "platform/api/platform.h"
+
+#include <atomic>
+#include <memory>
+
+#include "platform/api/atomic_boolean.h"
+#include "platform/api/atomic_reference.h"
+#include "platform/api/ble.h"
+#include "platform/api/ble_v2.h"
+#include "platform/api/bluetooth_adapter.h"
+#include "platform/api/bluetooth_classic.h"
+#include "platform/api/condition_variable.h"
+#include "platform/api/count_down_latch.h"
+#include "platform/api/hash_utils.h"
+#include "platform/api/lock.h"
+#include "platform/api/scheduled_executor.h"
+#include "platform/api/server_sync.h"
+#include "platform/api/settable_future.h"
+#include "platform/api/submittable_executor.h"
+#include "platform/api/system_clock.h"
+#include "platform/api/thread_utils.h"
+#include "platform/api/webrtc.h"
+#include "platform/api/wifi.h"
+#include "platform/impl/g3/atomic_reference_impl.h"
+#include "platform/impl/g3/settable_future_impl.h"
+#include "platform/impl/g3/system_clock_impl.h"
+#include "platform/impl/shared/atomic_boolean_impl.h"
+#include "platform/impl/shared/file_impl.h"
+#include "platform/impl/shared/posix_condition_variable.h"
+#include "platform/impl/shared/posix_lock.h"
+#include "platform/port/string.h"
+#include "platform/ptr.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/time/time.h"
+
+namespace location {
+namespace nearby {
+namespace platform {
+
+namespace {
+std::string getPayloadPath(std::int64_t payload_id) {
+  return "/tmp/" + std::to_string(payload_id);
+}
+}  // namespace
+
+Ptr<SubmittableExecutor> ImplementationPlatform::createSingleThreadExecutor() {
+  return Ptr<SubmittableExecutor>(/*new SingleThreadExecutorImpl()*/);
+}
+
+Ptr<SubmittableExecutor> ImplementationPlatform::createMultiThreadExecutor(
+    int max_concurrency) {
+  return Ptr<SubmittableExecutor>(/*new MultiThreadExecutorImpl()*/);
+}
+
+Ptr<ScheduledExecutor> ImplementationPlatform::createScheduledExecutor() {
+  return Ptr<ScheduledExecutor>(/*new ScheduledExecutorImpl()*/);
+}
+
+Ptr<AtomicReference<absl::any>>
+ImplementationPlatform::createAtomicReferenceAny(absl::any initial_value) {
+  return Ptr<AtomicReference<absl::any>>(
+      new AtomicReferenceImpl(initial_value));
+}
+
+Ptr<SettableFuture<absl::any>>
+ImplementationPlatform::createSettableFutureAny() {
+  return Ptr<SettableFuture<std::any>>(new SettableFutureImpl{});
+}
+
+Ptr<BluetoothAdapter> ImplementationPlatform::createBluetoothAdapter() {
+  return Ptr<BluetoothAdapter>{};
+}
+
+Ptr<WifiMedium> ImplementationPlatform::createWifiMedium() {
+  return Ptr<WifiMedium>();
+}
+
+Ptr<CountDownLatch> ImplementationPlatform::createCountDownLatch(
+    std::int32_t count) {
+  return Ptr<CountDownLatch>(/*new CountDownLatchImpl(count)*/);
+}
+
+Ptr<ThreadUtils> ImplementationPlatform::createThreadUtils() {
+  return Ptr<ThreadUtils>(/*new ThreadUtilsImpl()*/);
+}
+
+Ptr<SystemClock> ImplementationPlatform::createSystemClock() {
+  return Ptr<SystemClock>(new SystemClockImpl());
+}
+
+Ptr<AtomicBoolean> ImplementationPlatform::createAtomicBoolean(
+    bool initial_value) {
+  return Ptr<AtomicBoolean>(new AtomicBooleanImpl(initial_value));
+}
+
+Ptr<InputFile> ImplementationPlatform::createInputFile(
+    std::int64_t payload_id, std::int64_t total_size) {
+  return MakePtr(new InputFileImpl(getPayloadPath(payload_id), total_size));
+}
+
+Ptr<OutputFile> ImplementationPlatform::createOutputFile(
+    std::int64_t payload_id) {
+  return MakePtr(new OutputFileImpl(getPayloadPath(payload_id)));
+}
+
+Ptr<BluetoothClassicMedium>
+ImplementationPlatform::createBluetoothClassicMedium() {
+  return Ptr<BluetoothClassicMedium>();
+}
+
+Ptr<BLEMedium> ImplementationPlatform::createBLEMedium() {
+  return Ptr<BLEMedium>();
+}
+
+Ptr<BLEMediumV2> ImplementationPlatform::createBLEMediumV2() {
+  return Ptr<BLEMediumV2>();
+}
+
+Ptr<ServerSyncMedium> ImplementationPlatform::createServerSyncMedium() {
+  return Ptr<ServerSyncMedium>(/*new ServerSyncMediumImpl()*/);
+}
+
+Ptr<WifiLanMedium> ImplementationPlatform::createWifiLanMedium() {
+  return Ptr<WifiLanMedium>();
+}
+
+//Ptr<WebRtcSignalingMessenger>
+//ImplementationPlatform::createWebRtcSignalingMessenger(
+//    const std::string& self_id) {
+//  return Ptr<WebRtcSignalingMessenger>(/*new FCMSignalingMessenger()*/);
+//}
+
+Ptr<Lock> ImplementationPlatform::createLock() {
+  return Ptr<Lock>(new PosixLock());
+}
+
+Ptr<ConditionVariable> ImplementationPlatform::createConditionVariable(
+    Ptr<Lock> lock) {
+  return Ptr<ConditionVariable>(new PosixConditionVariable(lock));
+}
+
+Ptr<HashUtils> ImplementationPlatform::createHashUtils() {
+  return Ptr<HashUtils>(/*new HashUtilsImpl()*/);
+}
+
+std::string ImplementationPlatform::getDeviceId() {
+  // TODO(alexchau): Get deviceId from base
+  return "google3";
+}
+
+}  // namespace platform
+}  // namespace nearby
+}  // namespace location

cpp/platform/impl/g3/settable_future_impl.h

@@ -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_

cpp/platform/impl/g3/system_clock_impl.h

@@ -12,20 +12,26 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "platform/impl/default/default_platform.h"
+#ifndef PLATFORM_IMPL_G3_SYSTEM_CLOCK_IMPL_H_
+#define PLATFORM_IMPL_G3_SYSTEM_CLOCK_IMPL_H_
 
-#include "platform/impl/default/default_condition_variable.h"
-#include "platform/impl/default/default_lock.h"
+#include <cstdint>
+
+#include "platform/api/system_clock.h"
+#include "absl/time/clock.h"
+#include "absl/time/time.h"
 
 namespace location {
 namespace nearby {
 
-Ptr<Lock> DefaultPlatform::createLock() { return MakePtr(new DefaultLock()); }
-
-Ptr<ConditionVariable> DefaultPlatform::createConditionVariable(
-    Ptr<Lock> lock) {
-  return MakePtr(new DefaultConditionVariable(DowncastPtr<DefaultLock>(lock)));
-}
+class SystemClockImpl : public SystemClock {
+ public:
+  std::int64_t elapsedRealtime() override {
+    return absl::ToUnixMillis(absl::Now());
+  }
+};
 
 }  // namespace nearby
 }  // namespace location
+
+#endif  // PLATFORM_IMPL_G3_SYSTEM_CLOCK_IMPL_H_

cpp/platform/impl/sample/BUILD

@@ -13,12 +13,12 @@
 # limitations under the License.
 
 cc_library(
-    name = "sample",
+    name = "sample_platform",
     srcs = [
-        "sample_wifi_medium.cc",
-        "sample_wifi_medium.h",
+        "atomic_reference_impl.h",
+        "sample_platform.cc",
+        "settable_future_impl.h",
     ],
-    hdrs = ["sample_platform.h"],
     visibility = [
         "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
         "//core:__subpackages__",
@@ -28,7 +28,10 @@ cc_library(
         "//platform:types",
         "//platform:utils",
         "//platform/api",
+        "//platform/impl/shared:file",
+        "//platform/impl/shared/sample:sample_wifi_medium",
         "//platform/port:string",
         "//absl/time",
+        "//absl/types:any",
     ],
 )

cpp/platform/impl/sample/CMakeLists.txt

@@ -26,6 +26,7 @@ target_link_libraries(platform_impl_sample
   PUBLIC
     absl::time
     platform_api
+    platform_impl_shared_file
     platform_port_string
     platform_types
     platform_utils

cpp/platform/impl/sample/atomic_reference_impl.h

@@ -0,0 +1,39 @@
+// 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_SAMPLE_ATOMIC_REFERENCE_IMPL_H_
+#define PLATFORM_IMPL_SAMPLE_ATOMIC_REFERENCE_IMPL_H_
+
+#include "platform/api/atomic_reference_def.h"
+#include "absl/types/any.h"
+
+namespace location {
+namespace nearby {
+namespace platform {
+
+// Provide implementation for absl::any.
+class AtomicReferenceImpl : public AtomicReference<absl::any> {
+ public:
+  explicit AtomicReferenceImpl(absl::any initial_value) {}
+  ~AtomicReferenceImpl() override = default;
+
+  absl::any get() override { return {}; }
+  void set(absl::any value) override {}
+};
+
+}  // namespace platform
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_SAMPLE_ATOMIC_REFERENCE_IMPL_H_

cpp/platform/impl/sample/sample_platform.cc

@@ -0,0 +1,152 @@
+// 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.
+
+#include <cstdint>
+
+#include "platform/api/atomic_boolean.h"
+#include "platform/api/atomic_reference_def.h"
+#include "platform/api/ble.h"
+#include "platform/api/ble_v2.h"
+#include "platform/api/bluetooth_adapter.h"
+#include "platform/api/bluetooth_classic.h"
+#include "platform/api/condition_variable.h"
+#include "platform/api/count_down_latch.h"
+#include "platform/api/hash_utils.h"
+#include "platform/api/lock.h"
+#include "platform/api/platform.h"
+#include "platform/api/server_sync.h"
+#include "platform/api/settable_future_def.h"
+#include "platform/api/submittable_executor_def.h"
+#include "platform/api/system_clock.h"
+#include "platform/api/thread_utils.h"
+#include "platform/api/wifi.h"
+#include "platform/cancelable.h"
+#include "platform/impl/sample/atomic_reference_impl.h"
+#include "platform/impl/sample/settable_future_impl.h"
+#include "platform/impl/shared/file_impl.h"
+#include "platform/impl/shared/sample/sample_wifi_medium.h"
+#include "platform/port/string.h"
+#include "platform/ptr.h"
+#include "platform/runnable.h"
+#include "absl/types/any.h"
+
+namespace location {
+namespace nearby {
+namespace platform {
+
+namespace {
+std::string getPayloadPath(std::int64_t payload_id) {
+  return "/tmp/sample-" + std::to_string(payload_id);
+}
+}  // namespace
+
+Ptr<ScheduledExecutor> ImplementationPlatform::createScheduledExecutor() {
+  return Ptr<ScheduledExecutor>{};
+}
+
+Ptr<SubmittableExecutor> ImplementationPlatform::createSingleThreadExecutor() {
+  return Ptr<SubmittableExecutor>{};
+}
+
+Ptr<SubmittableExecutor> ImplementationPlatform::createMultiThreadExecutor(
+    int max_concurrency) {
+  return Ptr<SubmittableExecutor>{};
+}
+
+Ptr<AtomicReference<absl::any>>
+ImplementationPlatform::createAtomicReferenceAny(absl::any initial_value) {
+  return Ptr<AtomicReference<absl::any>>(
+      new AtomicReferenceImpl(initial_value));
+}
+
+Ptr<SettableFuture<absl::any>>
+ImplementationPlatform::createSettableFutureAny() {
+  return Ptr<SettableFuture<absl::any>>(new SettableFutureImpl{});
+}
+
+Ptr<BluetoothAdapter> ImplementationPlatform::createBluetoothAdapter() {
+  return Ptr<BluetoothAdapter>{};
+}
+
+Ptr<WifiMedium> ImplementationPlatform::createWifiMedium() {
+  return Ptr<WifiMedium>();
+}
+
+Ptr<CountDownLatch> ImplementationPlatform::createCountDownLatch(
+    std::int32_t count) {
+  return Ptr<CountDownLatch>{};
+}
+
+Ptr<ThreadUtils> ImplementationPlatform::createThreadUtils() {
+  return Ptr<ThreadUtils>{};
+}
+
+Ptr<SystemClock> ImplementationPlatform::createSystemClock() {
+  return Ptr<SystemClock>{};
+}
+
+Ptr<AtomicBoolean> ImplementationPlatform::createAtomicBoolean(
+    bool initial_value) {
+  return Ptr<AtomicBoolean>{};
+}
+
+Ptr<InputFile> ImplementationPlatform::createInputFile(
+    std::int64_t payload_id, std::int64_t total_size) {
+  return MakePtr(new InputFileImpl(getPayloadPath(payload_id), total_size));
+}
+
+Ptr<OutputFile> ImplementationPlatform::createOutputFile(
+    std::int64_t payload_id) {
+  return MakePtr(new OutputFileImpl(getPayloadPath(payload_id)));
+}
+
+Ptr<BluetoothClassicMedium>
+ImplementationPlatform::createBluetoothClassicMedium() {
+  return Ptr<BluetoothClassicMedium>();
+}
+
+Ptr<BLEMedium> ImplementationPlatform::createBLEMedium() {
+  return Ptr<BLEMedium>();
+}
+
+Ptr<BLEMediumV2> ImplementationPlatform::createBLEMediumV2() {
+  return Ptr<BLEMediumV2>();
+}
+
+Ptr<ServerSyncMedium> ImplementationPlatform::createServerSyncMedium() {
+  return Ptr<ServerSyncMedium>{};
+}
+
+Ptr<WebRtcSignalingMessenger>
+ImplementationPlatform::createWebRtcSignalingMessenger(
+    const std::string& self_id) {
+  return Ptr<WebRtcSignalingMessenger>{};
+}
+
+Ptr<Lock> ImplementationPlatform::createLock() { return Ptr<Lock>{}; }
+
+Ptr<ConditionVariable> ImplementationPlatform::createConditionVariable(
+    Ptr<Lock> lock) {
+  return Ptr<ConditionVariable>{};
+}
+
+Ptr<HashUtils> ImplementationPlatform::createHashUtils() {
+  return Ptr<HashUtils>{};
+}
+
+std::string ImplementationPlatform::getDeviceId() { return "sample"; }
+
+}  // namespace platform
+}  // namespace nearby
+}  // namespace location

cpp/platform/impl/sample/sample_platform.h

@@ -1,155 +0,0 @@
-// 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_SAMPLE_SAMPLE_PLATFORM_H_
-#define PLATFORM_IMPL_SAMPLE_SAMPLE_PLATFORM_H_
-
-#include <cstdint>
-
-#include "platform/api/atomic_boolean.h"
-#include "platform/api/atomic_reference.h"
-#include "platform/api/ble.h"
-#include "platform/api/ble_v2.h"
-#include "platform/api/bluetooth_adapter.h"
-#include "platform/api/bluetooth_classic.h"
-#include "platform/api/condition_variable.h"
-#include "platform/api/count_down_latch.h"
-#include "platform/api/hash_utils.h"
-#include "platform/api/lock.h"
-#include "platform/api/multi_thread_executor.h"
-#include "platform/api/settable_future.h"
-#include "platform/api/single_thread_executor.h"
-#include "platform/api/system_clock.h"
-#include "platform/api/thread_utils.h"
-#include "platform/api/wifi.h"
-#include "platform/cancelable.h"
-#include "platform/impl/sample/sample_wifi_medium.h"
-#include "platform/port/string.h"
-#include "platform/ptr.h"
-#include "platform/runnable.h"
-
-namespace location {
-namespace nearby {
-namespace sample {
-
-// The SamplePlatform class below shows an example of the factory functions
-// and typedefs.
-class SamplePlatform {
- public:
-  class SampleSubmittableExecutor
-      : public SubmittableExecutor<SampleSubmittableExecutor> {
-   public:
-    template <typename T>
-    Ptr<Future<T> > submit(Ptr<Callable<T> > callable) {
-      return Ptr<Future<T> >();
-    }
-  };
-
-  class SampleSingleThreadExecutor
-      : public SingleThreadExecutor<SampleSubmittableExecutor> {
-   public:
-    void execute(Ptr<Runnable> runnable) override {}
-    void shutdown() override {}
-  };
-
-  class SampleMultiThreadExecutor
-      : public MultiThreadExecutor<SampleSubmittableExecutor> {
-   public:
-    void execute(Ptr<Runnable> runnable) override {}
-    void shutdown() override {}
-  };
-
-  class SampleScheduledExecutor {
-   public:
-    Ptr<Cancelable> schedule(Ptr<Runnable> runnable,
-                             std::int64_t delay_millis) {
-      return Ptr<Cancelable>();
-    }
-    void shutdown() {}
-  };
-
-  typedef SampleSingleThreadExecutor SingleThreadExecutorType;
-  static Ptr<SingleThreadExecutorType> createSingleThreadExecutor() {
-    return MakePtr(new SingleThreadExecutorType());
-  }
-
-  typedef SampleMultiThreadExecutor MultiThreadExecutorType;
-  static Ptr<MultiThreadExecutorType> createMultiThreadExecutor(
-      std::int32_t max_concurrency) {
-    return MakePtr(new MultiThreadExecutorType());
-  }
-
-  typedef SampleScheduledExecutor ScheduledExecutorType;
-  static Ptr<ScheduledExecutorType> createScheduledExecutor() {
-    return MakePtr(new ScheduledExecutorType());
-  }
-
-  static Ptr<BluetoothAdapter> createBluetoothAdapter() {
-    return Ptr<BluetoothAdapter>();
-  }
-
-  static Ptr<WifiMedium> createWifiMedium() {
-    return MakePtr(new SampleWifiMedium());
-  }
-
-  static Ptr<CountDownLatch> createCountDownLatch(std::int32_t count) {
-    return Ptr<CountDownLatch>();
-  }
-
-  template <typename T>
-  static Ptr<SettableFuture<T> > createSettableFuture() {
-    return Ptr<SettableFuture<T> >();
-  }
-
-  static Ptr<ThreadUtils> createThreadUtils() { return Ptr<ThreadUtils>(); }
-
-  static Ptr<SystemClock> createSystemClock() { return Ptr<SystemClock>(); }
-
-  static Ptr<AtomicBoolean> createAtomicBoolean(bool initial_value) {
-    return Ptr<AtomicBoolean>();
-  }
-
-  template <typename T>
-  static Ptr<AtomicReference<T> > createAtomicReference(T initial_value) {
-    return Ptr<AtomicReference<T> >();
-  }
-
-  static Ptr<BluetoothClassicMedium> createBluetoothClassicMedium() {
-    return Ptr<BluetoothClassicMedium>();
-  }
-
-  static Ptr<BLEMedium> createBLEMedium() { return Ptr<BLEMedium>(); }
-
-  static Ptr<BLEMediumV2> createBLEMediumV2() { return Ptr<BLEMediumV2>(); }
-
-  static Ptr<Lock> createLock() { return Ptr<Lock>(); }
-
-  static Ptr<ConditionVariable> createConditionVariable(Ptr<Lock> lock) {
-    return Ptr<ConditionVariable>();
-  }
-
-  static Ptr<HashUtils> createHashUtils() { return Ptr<HashUtils>(); }
-
-  static std::string getDeviceId() { return ""; }
-
-  static std::string getPayloadPath(int64_t payload_id) {
-    return "/tmp/" + std::to_string(payload_id);
-  }
-};
-
-}  // namespace sample
-}  // namespace nearby
-}  // namespace location
-
-#endif  // PLATFORM_IMPL_SAMPLE_SAMPLE_PLATFORM_H_

cpp/platform/impl/sample/settable_future_impl.h

@@ -0,0 +1,49 @@
+// 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_SAMPLE_SETTABLE_FUTURE_IMPL_H_
+#define PLATFORM_IMPL_SAMPLE_SETTABLE_FUTURE_IMPL_H_
+
+#include "platform/api/settable_future_def.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 { return true; }
+
+  bool setException(Exception exception) override { return true; }
+
+  void addListener(Ptr<Runnable> runnable, Executor* executor) override {}
+
+  ExceptionOr<std::any> get() override {
+    return ExceptionOr<std::any>{Exception{Exception::kFailed}};
+  }
+
+  ExceptionOr<std::any> get(std::int64_t timeout_ms) override {
+    return ExceptionOr<std::any>{Exception{Exception::kFailed}};
+  }
+};
+
+}  // namespace platform
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_SAMPLE_SETTABLE_FUTURE_IMPL_H_

cpp/platform/impl/shared/BUILD

@@ -0,0 +1,87 @@
+# 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.
+
+cc_library(
+    name = "posix_lock",
+    srcs = [
+        "posix_lock.cc",
+    ],
+    hdrs = [
+        "posix_lock.h",
+    ],
+    visibility = [
+        "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
+        "//platform/impl:__subpackages__",
+    ],
+    deps = [
+        "//platform/api",
+    ],
+)
+
+cc_library(
+    name = "posix_condition_variable",
+    srcs = [
+        "posix_condition_variable.cc",
+    ],
+    hdrs = [
+        "posix_condition_variable.h",
+    ],
+    visibility = [
+        "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
+        "//platform/impl:__subpackages__",
+    ],
+    deps = [
+        ":posix_lock",
+        "//platform:types",
+        "//platform/api:condition_variable",
+    ],
+)
+
+cc_library(
+    name = "atomic_boolean",
+    hdrs = ["atomic_boolean_impl.h"],
+    visibility = [
+        "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
+        "//platform/impl:__subpackages__",
+    ],
+    deps = ["//platform/api"],
+)
+
+cc_library(
+    name = "file",
+    srcs = ["file_impl.cc"],
+    hdrs = ["file_impl.h"],
+    visibility = [
+        "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
+        "//core:__subpackages__",
+        "//platform/impl:__subpackages__",
+    ],
+    deps = [
+        "//platform:types",
+        "//platform/api",
+    ],
+)
+
+cc_test(
+    name = "file_test",
+    timeout = "short",
+    srcs = [
+        "file_impl_test.cc",
+    ],
+    deps = [
+        ":file",
+        "//file/util:temp_path",
+        "//testing/base/public:gunit_main",
+    ],
+)

cpp/platform/impl/shared/CMakeLists.txt

@@ -0,0 +1,101 @@
+# 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.
+
+add_library(platform_impl_shared_posix_lock STATIC)
+
+target_sources(platform_impl_shared_posix_lock
+  PRIVATE
+    "posix_lock.cc"
+  PUBLIC
+    "posix_lock.h"
+)
+
+target_include_directories(platform_impl_shared_posix_lock
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+
+target_link_libraries(platform_impl_shared_posix_lock
+  PUBLIC
+    platform_api
+    platform_types
+)
+
+add_library(platform_impl_shared_posix_condition_variable STATIC)
+
+target_sources(platform_impl_shared_posix_condition_variable
+  PRIVATE
+    "posix_condition_variable.cc"
+  PUBLIC
+    "posix_condition_variable.h"
+)
+
+target_include_directories(platform_impl_shared_posix_condition_variable
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(platform_impl_shared_posix_condition_variable
+  PUBLIC
+    platform_api
+    platform_impl_shared_posix_lock
+    platform_types
+    absl::raw_logging_internal
+)
+
+add_library(platform_impl_shared_file STATIC)
+
+target_sources(platform_impl_shared_file
+  PRIVATE
+    "file_impl.cc"
+  PUBLIC
+    "file_impl.h"
+)
+
+target_include_directories(platform_impl_shared_file
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(platform_impl_shared_file
+  PUBLIC
+    platform_api
+    platform_types
+)
+
+add_library(platform_impl_shared_atomic_boolean STATIC)
+
+target_sources(platform_impl_shared_atomic_boolean
+  PUBLIC
+    "atomic_boolean_impl.h"
+)
+
+target_include_directories(platform_impl_shared_atomic_boolean
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(platform_impl_shared_atomic_boolean
+  PUBLIC
+    platform_api
+    platform_types
+)
+
+set_target_properties(platform_impl_shared_atomic_boolean
+  PROPERTIES
+    LINKER_LANGUAGE CXX
+)
+
+add_subdirectory(sample)

cpp/platform/impl/shared/atomic_boolean_impl.h

@@ -0,0 +1,47 @@
+// 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_SHARED_ATOMIC_BOOLEAN_IMPL_H_
+#define PLATFORM_IMPL_SHARED_ATOMIC_BOOLEAN_IMPL_H_
+
+#include <atomic>
+
+#include "platform/api/atomic_boolean.h"
+
+namespace location {
+namespace nearby {
+
+class AtomicBooleanImpl : public AtomicBoolean {
+ public:
+  explicit AtomicBooleanImpl(bool initial_value) : value_(initial_value) {}
+  ~AtomicBooleanImpl() override = default;
+
+  // AtomicBoolean:
+  bool get() override {
+    return value_.load();
+  }
+
+  // AtomicBoolean:
+  void set(bool value) override {
+    value_.store(value);
+  }
+
+ private:
+  std::atomic_bool value_;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_SHARED_ATOMIC_BOOLEAN_IMPL_H_

cpp/platform/impl/shared/file_impl.cc

@@ -0,0 +1,89 @@
+// 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.
+
+#include "platform/impl/shared/file_impl.h"
+
+#include <cstddef>
+#include <memory>
+
+namespace location {
+namespace nearby {
+
+// InputFile
+
+InputFileImpl::InputFileImpl(const std::string& path, std::int64_t size)
+    : file_(path), path_(path), total_size_(size) {}
+
+ExceptionOr<ConstPtr<ByteArray>> InputFileImpl::read(int64_t size) {
+  if (!file_.is_open()) {
+    return ExceptionOr<ConstPtr<ByteArray>>(Exception::IO);
+  }
+
+  if (file_.peek() == EOF) {
+    return ExceptionOr<ConstPtr<ByteArray>>(ConstPtr<ByteArray>());
+  }
+
+  if (!file_.good()) {
+    return ExceptionOr<ConstPtr<ByteArray>>(Exception::IO);
+  }
+
+  std::unique_ptr<char[]> read_bytes {new char [size]};
+  file_.read(read_bytes.get(), static_cast<ptrdiff_t>(size));
+  auto num_bytes_read = file_.gcount();
+  if (num_bytes_read == 0) {
+    return ExceptionOr<ConstPtr<ByteArray>>(Exception::IO);
+  }
+
+  return ExceptionOr<ConstPtr<ByteArray>>(
+      MakeConstPtr(new ByteArray(read_bytes.get(), num_bytes_read)));
+}
+
+std::string InputFileImpl::getFilePath() const { return path_; }
+
+std::int64_t InputFileImpl::getTotalSize() const { return total_size_; }
+
+void InputFileImpl::close() {
+  if (file_.is_open()) {
+    file_.close();
+  }
+}
+
+// OutputFile
+
+OutputFileImpl::OutputFileImpl(const std::string& path) : file_(path) {}
+
+Exception::Value OutputFileImpl::write(ConstPtr<ByteArray> data) {
+  ScopedPtr<ConstPtr<ByteArray>> scoped_data(data);
+
+  if (!file_.is_open()) {
+    return Exception::IO;
+  }
+
+  if (!file_.good()) {
+    return Exception::IO;
+  }
+
+  file_.write(data->getData(), data->size());
+  file_.flush();
+  return file_.good() ? Exception::NONE : Exception::IO;
+}
+
+void OutputFileImpl::close() {
+  if (file_.is_open()) {
+    file_.close();
+  }
+}
+
+}  // namespace nearby
+}  // namespace location

cpp/platform/impl/shared/file_impl.h

@@ -0,0 +1,60 @@
+// 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_SHARED_FILE_IMPL_H_
+#define PLATFORM_IMPL_SHARED_FILE_IMPL_H_
+
+#include <cstdint>
+#include <fstream>
+
+#include "platform/api/input_file.h"
+#include "platform/api/output_file.h"
+#include "platform/exception.h"
+#include "platform/ptr.h"
+
+namespace location {
+namespace nearby {
+
+class InputFileImpl final : public InputFile {
+ public:
+  InputFileImpl(const std::string& path, std::int64_t size);
+  ~InputFileImpl() override {}
+
+  ExceptionOr<ConstPtr<ByteArray>> read(std::int64_t size) override;
+  std::string getFilePath() const override;
+  std::int64_t getTotalSize() const override;
+  void close() override;
+
+ private:
+  std::ifstream file_;
+  const std::string path_;
+  const std::int64_t total_size_;
+};
+
+class OutputFileImpl final : public OutputFile {
+ public:
+  explicit OutputFileImpl(const std::string& path);
+  ~OutputFileImpl() override {}
+
+  Exception::Value write(ConstPtr<ByteArray> data) override;
+  void close() override;
+
+ private:
+  std::ofstream file_;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_SHARED_FILE_IMPL_H_

cpp/platform/impl/shared/file_impl_test.cc

@@ -0,0 +1,147 @@
+// 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.
+
+#include "platform/impl/shared/file_impl.h"
+
+#include <cstdio>
+#include <cstring>
+#include <fstream>
+#include <memory>
+#include <ostream>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+
+namespace location {
+namespace nearby {
+
+
+class FileImplTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    path_ = std::tmpnam(nullptr);;
+    std::ofstream output_file(path_);
+    file_ = std::fstream(path_, std::fstream::in | std::fstream::out);
+  }
+
+  void WriteToFile(const std::string& text) {
+    file_ << text;
+    file_.flush();
+    size_ += text.size();
+  }
+
+  size_t GetSize() const { return size_; }
+
+  void AssertEquals(const ExceptionOr<ConstPtr<ByteArray>>& bytes,
+                    const std::string& expected) {
+    ASSERT_TRUE(bytes.ok());
+    ScopedPtr<ConstPtr<ByteArray>> byte_array(bytes.result());
+    ASSERT_STREQ(byte_array->getData(), expected.c_str());
+    ASSERT_EQ(byte_array->size(), expected.length());
+  }
+
+  void AssertNull(const ExceptionOr<ConstPtr<ByteArray>>& bytes) {
+    ASSERT_TRUE(bytes.ok());
+    ASSERT_TRUE(bytes.result().isNull());
+  }
+
+  static constexpr int64_t kMaxSize = 3;
+
+  std::string path_;
+  std::fstream file_;
+  size_t size_ = 0;
+};
+
+TEST_F(FileImplTest, InputFile_NonExistentPath) {
+  InputFileImpl input_file("/not/a/valid/path.txt", GetSize());
+  ExceptionOr<ConstPtr<ByteArray>> read_result = input_file.read(kMaxSize);
+  ASSERT_FALSE(read_result.ok());
+  ASSERT_EQ(read_result.exception(), Exception::IO);
+}
+
+TEST_F(FileImplTest, InputFile_GetFilePath) {
+  InputFileImpl input_file(path_, GetSize());
+  ASSERT_EQ(input_file.getFilePath(), path_);
+}
+
+TEST_F(FileImplTest, InputFile_EmptyFileEOF) {
+  InputFileImpl input_file(path_, GetSize());
+  AssertNull(input_file.read(kMaxSize));
+}
+
+TEST_F(FileImplTest, InputFile_ReadWorks) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  auto read_data = input_file.read(kMaxSize);
+  read_data.result().destroy();
+  SUCCEED();
+}
+
+TEST_F(FileImplTest, InputFile_ReadUntilEOF) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  AssertEquals(input_file.read(kMaxSize), "abc");
+  AssertNull(input_file.read(kMaxSize));
+}
+
+TEST_F(FileImplTest, InputFile_ReadWithSize) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  AssertEquals(input_file.read(2), "ab");
+  AssertEquals(input_file.read(1), "c");
+  AssertNull(input_file.read(kMaxSize));
+}
+
+TEST_F(FileImplTest, InputFile_GetTotalSize) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  EXPECT_EQ(input_file.getTotalSize(), 3);
+  AssertEquals(input_file.read(1), "a");
+  EXPECT_EQ(input_file.getTotalSize(), 3);
+}
+
+TEST_F(FileImplTest, InputFile_Close) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  input_file.close();
+  ExceptionOr<ConstPtr<ByteArray>> read_result = input_file.read(kMaxSize);
+  ASSERT_FALSE(read_result.ok());
+  ASSERT_EQ(read_result.exception(), Exception::IO);
+}
+
+TEST_F(FileImplTest, OutputFile_NonExistentPath) {
+  OutputFileImpl output_file("/not/a/valid/path.txt");
+  ConstPtr<ByteArray> bytes = MakeConstPtr(new ByteArray("a", 1));
+  Exception::Value write_result = output_file.write(bytes);
+  ASSERT_EQ(write_result, Exception::IO);
+}
+
+TEST_F(FileImplTest, OutputFile_Write) {
+  OutputFileImpl output_file(path_);
+  ConstPtr<ByteArray> bytes1 = MakeConstPtr(new ByteArray("a", 1));
+  ConstPtr<ByteArray> bytes2 = MakeConstPtr(new ByteArray("bc", 2));
+  ASSERT_EQ(output_file.write(bytes1), Exception::NONE);
+  ASSERT_EQ(output_file.write(bytes2), Exception::NONE);
+  InputFileImpl input_file(path_, GetSize());
+  AssertEquals(input_file.read(kMaxSize), "abc");
+}
+
+TEST_F(FileImplTest, OutputFile_Close) {
+  OutputFileImpl output_file(path_);
+  output_file.close();
+  ConstPtr<ByteArray> bytes = MakeConstPtr(new ByteArray("a", 1));
+  ASSERT_EQ(output_file.write(bytes), Exception::IO);
+}
+}  // namespace nearby
+}  // namespace location

cpp/platform/impl/shared/posix_condition_variable.cc

@@ -12,30 +12,30 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "platform/impl/default/default_condition_variable.h"
+#include "platform/impl/shared/posix_condition_variable.h"
 
 namespace location {
 namespace nearby {
 
-DefaultConditionVariable::DefaultConditionVariable(Ptr<DefaultLock> lock)
+PosixConditionVariable::PosixConditionVariable(Ptr<PosixLock> lock)
     : lock_(lock), attr_(), cond_() {
   pthread_condattr_init(&attr_);
 
   pthread_cond_init(&cond_, &attr_);
 }
 
-DefaultConditionVariable::~DefaultConditionVariable() {
+PosixConditionVariable::~PosixConditionVariable() {
   pthread_cond_destroy(&cond_);
 
   pthread_condattr_destroy(&attr_);
 }
 
-void DefaultConditionVariable::notify() { pthread_cond_broadcast(&cond_); }
+void PosixConditionVariable::notify() { pthread_cond_broadcast(&cond_); }
 
-Exception::Value DefaultConditionVariable::wait() {
+Exception::Value PosixConditionVariable::wait() {
   pthread_cond_wait(&cond_, &(lock_->mutex_));
 
-  return Exception::NONE;
+  return Exception::kSuccess;
 }
 
 }  // namespace nearby

cpp/platform/impl/shared/posix_condition_variable.h

@@ -12,28 +12,28 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef PLATFORM_IMPL_DEFAULT_DEFAULT_CONDITION_VARIABLE_H_
-#define PLATFORM_IMPL_DEFAULT_DEFAULT_CONDITION_VARIABLE_H_
+#ifndef PLATFORM_IMPL_SHARED_POSIX_CONDITION_VARIABLE_H_
+#define PLATFORM_IMPL_SHARED_POSIX_CONDITION_VARIABLE_H_
 
 #include <pthread.h>
 
 #include "platform/api/condition_variable.h"
-#include "platform/impl/default/default_lock.h"
+#include "platform/impl/shared/posix_lock.h"
 #include "platform/ptr.h"
 
 namespace location {
 namespace nearby {
 
-class DefaultConditionVariable : public ConditionVariable {
+class PosixConditionVariable : public ConditionVariable {
  public:
-  explicit DefaultConditionVariable(Ptr<DefaultLock> lock);
-  ~DefaultConditionVariable() override;
+  explicit PosixConditionVariable(Ptr<PosixLock> lock);
+  ~PosixConditionVariable() override;
 
   void notify() override;
   Exception::Value wait() override;
 
  private:
-  Ptr<DefaultLock> lock_;
+  Ptr<PosixLock> lock_;
   pthread_condattr_t attr_;
   pthread_cond_t cond_;
 };
@@ -41,4 +41,4 @@ class DefaultConditionVariable : public ConditionVariable {
 }  // namespace nearby
 }  // namespace location
 
-#endif  // PLATFORM_IMPL_DEFAULT_DEFAULT_CONDITION_VARIABLE_H_
+#endif  // PLATFORM_IMPL_SHARED_POSIX_CONDITION_VARIABLE_H_

cpp/platform/impl/shared/posix_lock.cc

@@ -12,27 +12,27 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "platform/impl/default/default_lock.h"
+#include "platform/impl/shared/posix_lock.h"
 
 namespace location {
 namespace nearby {
 
-DefaultLock::DefaultLock() : attr_(), mutex_() {
+PosixLock::PosixLock() : attr_(), mutex_() {
   pthread_mutexattr_init(&attr_);
   pthread_mutexattr_settype(&attr_, PTHREAD_MUTEX_RECURSIVE);
 
   pthread_mutex_init(&mutex_, &attr_);
 }
 
-DefaultLock::~DefaultLock() {
+PosixLock::~PosixLock() {
   pthread_mutex_destroy(&mutex_);
 
   pthread_mutexattr_destroy(&attr_);
 }
 
-void DefaultLock::lock() { pthread_mutex_lock(&mutex_); }
+void PosixLock::lock() { pthread_mutex_lock(&mutex_); }
 
-void DefaultLock::unlock() { pthread_mutex_unlock(&mutex_); }
+void PosixLock::unlock() { pthread_mutex_unlock(&mutex_); }
 
 }  // namespace nearby
 }  // namespace location

cpp/platform/impl/shared/posix_lock.h

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef PLATFORM_IMPL_DEFAULT_DEFAULT_LOCK_H_
-#define PLATFORM_IMPL_DEFAULT_DEFAULT_LOCK_H_
+#ifndef PLATFORM_IMPL_SHARED_POSIX_LOCK_H_
+#define PLATFORM_IMPL_SHARED_POSIX_LOCK_H_
 
 #include <pthread.h>
 
@@ -22,16 +22,16 @@
 namespace location {
 namespace nearby {
 
-class DefaultLock : public Lock {
+class PosixLock : public Lock {
  public:
-  DefaultLock();
-  ~DefaultLock() override;
+  PosixLock();
+  ~PosixLock() override;
 
   void lock() override;
   void unlock() override;
 
  private:
-  friend class DefaultConditionVariable;
+  friend class PosixConditionVariable;
 
   pthread_mutexattr_t attr_;
   pthread_mutex_t mutex_;
@@ -40,4 +40,4 @@ class DefaultLock : public Lock {
 }  // namespace nearby
 }  // namespace location
 
-#endif  // PLATFORM_IMPL_DEFAULT_DEFAULT_LOCK_H_
+#endif  // PLATFORM_IMPL_SHARED_POSIX_LOCK_H_

cpp/platform/impl/shared/sample/BUILD

@@ -13,47 +13,24 @@
 # limitations under the License.
 
 cc_library(
-    name = "default",
+    name = "sample_wifi_medium",
     srcs = [
-        "default_platform.cc",
+        "sample_wifi_medium.cc",
     ],
     hdrs = [
-        "default_condition_variable.h",
-        "default_lock.h",
-        "default_platform.h",
+        "sample_wifi_medium.h",
     ],
     visibility = [
         "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
         "//core:__subpackages__",
+        "//platform/impl:__subpackages__",
+        "//location/nearby/setup/core:__subpackages__",
     ],
     deps = [
-        ":condition_variable",
-        ":lock",
         "//platform:types",
+        "//platform:utils",
         "//platform/api",
-    ],
-)
-
-cc_library(
-    name = "lock",
-    srcs = ["default_lock.cc"],
-    hdrs = ["default_lock.h"],
-    visibility = [
-        "//platform:__subpackages__",
-    ],
-    deps = ["//platform/api:lock"],
-)
-
-cc_library(
-    name = "condition_variable",
-    srcs = ["default_condition_variable.cc"],
-    hdrs = ["default_condition_variable.h"],
-    visibility = [
-        "//platform:__subpackages__",
-    ],
-    deps = [
-        ":lock",
-        "//platform:types",
-        "//platform/api:condition_variable",
+        "//platform/port:string",
+        "//absl/time",
     ],
 )

cpp/platform/impl/shared/sample/CMakeLists.txt

@@ -0,0 +1,31 @@
+# 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.
+
+add_library(platform_impl_shared_sample STATIC)
+
+target_sources(platform_impl_shared_sample
+  PRIVATE
+    sample_wifi_medium.cc
+  PUBLIC
+    sample_wifi_medium.h
+)
+
+target_link_libraries(platform_impl_shared_sample
+  PUBLIC
+    absl::time
+    platform_api
+    platform_port_string
+    platform_types
+    platform_utils
+)

cpp/platform/impl/shared/sample/sample_wifi_medium.cc

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "platform/impl/sample/sample_wifi_medium.h"
+#include "platform/impl/shared/sample/sample_wifi_medium.h"
 
 #include <cstdint>
 

cpp/platform/impl/shared/sample/sample_wifi_medium.h

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#ifndef PLATFORM_IMPL_SAMPLE_SAMPLE_WIFI_MEDIUM_H_
-#define PLATFORM_IMPL_SAMPLE_SAMPLE_WIFI_MEDIUM_H_
+#ifndef PLATFORM_IMPL_SHARED_SAMPLE_SAMPLE_WIFI_MEDIUM_H_
+#define PLATFORM_IMPL_SHARED_SAMPLE_SAMPLE_WIFI_MEDIUM_H_
 
 #include "platform/api/wifi.h"
 
@@ -70,4 +70,4 @@ class SampleWifiMedium : public WifiMedium {
 }  // namespace nearby
 }  // namespace location
 
-#endif  // PLATFORM_IMPL_SAMPLE_SAMPLE_WIFI_MEDIUM_H_
+#endif  // PLATFORM_IMPL_SHARED_SAMPLE_SAMPLE_WIFI_MEDIUM_H_