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content/browser/sensors/provider_impl.h

+// 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/memory/ref_counted.h"
+#include "base/message_loop_proxy.h"
+#include "base/threading/thread.h"
+#include "content/browser/sensors/provider.h"
+
+#include <set>
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+namespace sensors {
+
+class ConnectionImpl;
+
+class ProviderImpl : public Provider {
+ public:
+  static ProviderImpl* GetInstance();
+
+  virtual Connection* Open(Listener* listener);
+
+  virtual void FireSensorChanged(Channel channel, const std::string& data);
+
+ private:
+  static const int kIIOMessageSize = 16;
+
+  ProviderImpl();
+  virtual ~ProviderImpl();
+
+  friend class DefaultSingletonTraits<ProviderImpl>;
+  DISALLOW_COPY_AND_ASSIGN(ProviderImpl);
+
+  // Quick hack to support cwolfe's IIO driver
+
+  bool IsOnDeviceThread() const;
+
+  void DeviceStart();
+  void DeviceStop();
+  void DeviceRead();
+  bool DoDeviceRead();
+
+  scoped_refptr<base::MessageLoopProxy> device_proxy_;
+  int device_fd_;
+  unsigned char device_buf_[kIIOMessageSize];
+  int device_buf_end_;
+
+  friend class ConnectionImpl;
+  void ConnectionStarted(ConnectionImpl* conn,
+                         Channel channel, const std::string& data);
+  void ConnectionStopped(ConnectionImpl* conn,
+                         Channel channel);
+  void ConnectionClosed(ConnectionImpl* conn);
+
+  ObserverList<ConnectionImpl, true> connections_;
+};
+
+}  // namespace sensors
+
+DISABLE_RUNNABLE_METHOD_REFCOUNT(sensors::ProviderImpl);
+
+#endif  // CONTENT_BROWSER_SENSORS_PROVIDER_IMPL_H_