4 files changed, 155 insertions, 0 deletions
diff --git a/content/browser/sensors/sensors_provider.cc b/content/browser/sensors/sensors_provider.cc
new file mode 100644
index 0000000..a3c3dce
--- /dev/null
+++ b/content/browser/sensors/sensors_provider.cc
@@ -0,0 +1,21 @@
+// Copyright (c) 2011 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/sensors/sensors_provider.h"
+
+#include "content/browser/sensors/sensors_provider_impl.h"
+
+namespace sensors {
+
+Provider* Provider::GetInstance() {
+  return ProviderImpl::GetInstance();
+}
+
+Provider::Provider() {
+}
+
+Provider::~Provider() {
+}
+
+}  // namespace sensors
diff --git a/content/browser/sensors/sensors_provider.h b/content/browser/sensors/sensors_provider.h
new file mode 100644
index 0000000..72bc15f
--- /dev/null
+++ b/content/browser/sensors/sensors_provider.h
@@ -0,0 +1,57 @@
+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_BROWSER_SENSORS_PROVIDER_H_
+#define CONTENT_BROWSER_SENSORS_PROVIDER_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "content/common/sensors_listener.h"
+
+// The sensors API will unify various types of sensor data into a set of
+// channels, each of which provides change events and periodic updates.
+//
+// This version of the API is intended only to support the experimental screen
+// rotation code and is not for general use. In particular, the final listener
+// will declare generic |OnSensorChanged| and |OnSensorUpdated| methods, rather
+// than the special-purpose |OnScreenOrientationChanged|.
+
+namespace sensors {
+
+// TODO(cwolfe): Finish defining the initial set of channels and replace this
+// with the generic sensor provider.
+//
+class Provider {
+ public:
+  static Provider* GetInstance();
+
+  // Adds a sensor listener. The listener will receive callbacks to indicate
+  // sensor changes and updates until it is removed.
+  //
+  // This method may be called in any thread. Callbacks on a listener will
+  // always be executed in the thread which added that listener.
+  virtual void AddListener(Listener* listener) = 0;
+
+  // Removes a sensor listener.
+  //
+  // This method must be called in the same thread which added the listener.
+  // If the listener is not currently subscribed, this method may be called in
+  // any thread.
+  virtual void RemoveListener(Listener* listener) = 0;
+
+  // Broadcasts a change to the coarse screen orientation.
+  //
+  // This method may be called in any thread.
+  virtual void ScreenOrientationChanged(const ScreenOrientation& change) = 0;
+
+ protected:
+  Provider();
+  virtual ~Provider();
+
+  DISALLOW_COPY_AND_ASSIGN(Provider);
+};
+
+}  // namespace sensors
+
+#endif  // CONTENT_BROWSER_SENSORS_PROVIDER_H_
diff --git a/content/browser/sensors/sensors_provider_impl.cc b/content/browser/sensors/sensors_provider_impl.cc
new file mode 100644
index 0000000..9c151f7
--- /dev/null
+++ b/content/browser/sensors/sensors_provider_impl.cc
@@ -0,0 +1,35 @@
+// Copyright (c) 2011 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/sensors/sensors_provider_impl.h"
+
+#include "base/memory/singleton.h"
+
+namespace sensors {
+
+ProviderImpl* ProviderImpl::GetInstance() {
+  return Singleton<ProviderImpl>::get();
+}
+
+ProviderImpl::ProviderImpl()
+    : listeners_(new ListenerList()) {
+}
+
+ProviderImpl::~ProviderImpl() {
+}
+
+void ProviderImpl::AddListener(Listener* listener) {
+  listeners_->AddObserver(listener);
+}
+
+void ProviderImpl::RemoveListener(Listener* listener) {
+  listeners_->RemoveObserver(listener);
+}
+
+void ProviderImpl::ScreenOrientationChanged(
+    const ScreenOrientation& change) {
+  listeners_->Notify(&Listener::OnScreenOrientationChanged, change);
+}
+
+}  // namespace sensors
diff --git a/content/browser/sensors/sensors_provider_impl.h b/content/browser/sensors/sensors_provider_impl.h
new file mode 100644
index 0000000..a4a6b04
--- /dev/null
+++ b/content/browser/sensors/sensors_provider_impl.h
@@ -0,0 +1,42 @@
+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_BROWSER_SENSORS_PROVIDER_IMPL_H_
+#define CONTENT_BROWSER_SENSORS_PROVIDER_IMPL_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/observer_list_threadsafe.h"
+#include "content/browser/sensors/sensors_provider.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+namespace sensors {
+
+class ProviderImpl : public Provider {
+ public:
+  static ProviderImpl* GetInstance();
+
+  // Provider implementation
+  virtual void AddListener(Listener* listener) OVERRIDE;
+  virtual void RemoveListener(Listener* listener) OVERRIDE;
+  virtual void ScreenOrientationChanged(
+      const ScreenOrientation& change) OVERRIDE;
+
+ private:
+  friend struct DefaultSingletonTraits<ProviderImpl>;
+
+  ProviderImpl();
+  virtual ~ProviderImpl();
+
+  typedef ObserverListThreadSafe<Listener> ListenerList;
+  scoped_refptr<ListenerList> listeners_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProviderImpl);
+};
+
+}  // namespace sensors
+
+#endif  // CONTENT_BROWSER_SENSORS_PROVIDER_IMPL_H_