Implement PollingThread for Device Motion.

content/browser/device_orientation/device_motion_provider_unittest.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/device_orientation/device_motion_provider.h"
+
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/synchronization/waitable_event.h"
+#include "content/browser/device_orientation/data_fetcher_shared_memory.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+namespace {
+
+const int kPeriodInMilliseconds = 100;
+
+class FakeDataFetcherSharedMemory : public DataFetcherSharedMemory {
+ public:
+  FakeDataFetcherSharedMemory()
+      : start_fetching_data_(false, false),
+        stop_fetching_data_(false, false),
+        fetched_data_(false, false) {
+  }
+  virtual ~FakeDataFetcherSharedMemory() { }
+
+  virtual bool NeedsPolling() OVERRIDE {
+    return true;
+  }
+
+  virtual bool FetchDeviceMotionDataIntoBuffer() OVERRIDE {
+    buffer_->seqlock.WriteBegin();
+    buffer_->data.interval = kPeriodInMilliseconds;
+    buffer_->seqlock.WriteEnd();
+    fetched_data_.Signal();
+    return true;
+  }
+
+  virtual bool StartFetchingDeviceMotionData(
+    DeviceMotionHardwareBuffer* buffer) OVERRIDE {
+    buffer_ = buffer;
+    start_fetching_data_.Signal();
+    return true;
+  }
+
+  virtual void StopFetchingDeviceMotionData() OVERRIDE {
+    stop_fetching_data_.Signal();
+  }
+
+  void WaitForStart() {
+    start_fetching_data_.Wait();
+  }
+
+  void WaitForStop() {
+    stop_fetching_data_.Wait();
+  }
+
+  void WaitForDataFetch() {
+    fetched_data_.Wait();
+  }
+
+  DeviceMotionHardwareBuffer* GetBuffer() {
+    return buffer_;
+  }
+
+ private:
+  base::WaitableEvent start_fetching_data_;
+  base::WaitableEvent stop_fetching_data_;
+  base::WaitableEvent fetched_data_;
+  DeviceMotionHardwareBuffer* buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeDataFetcherSharedMemory);
+};
+
+
+TEST(DeviceMotionProviderTest, DoesPolling) {
+  FakeDataFetcherSharedMemory* mock_data_fetcher =
+      new FakeDataFetcherSharedMemory();
+  EXPECT_TRUE(mock_data_fetcher->NeedsPolling());
+
+  scoped_ptr<DeviceMotionProvider> provider(new DeviceMotionProvider(
+      scoped_ptr<DataFetcherSharedMemory>(mock_data_fetcher)));
+
+  provider->StartFetchingDeviceMotionData();
+  mock_data_fetcher->WaitForStart();
+  mock_data_fetcher->WaitForDataFetch();
+
+  EXPECT_EQ(kPeriodInMilliseconds,
+      mock_data_fetcher->GetBuffer()->data.interval);
+
+  provider->StopFetchingDeviceMotionData();
+  mock_data_fetcher->WaitForStop();
+}
+
+}  // namespace
+
+}  // namespace content