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// Copyright (c) 2012 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.
// This file declares GPS providers that run on linux. Currently, just uses
// the libgps (gpsd) API. Public for testing only - for normal usage this
// header should not be required, as location_provider.h declares the needed
// factory function.
#ifndef CONTENT_BROWSER_GEOLOCATION_GPS_LOCATION_PROVIDER_LINUX_H_
#define CONTENT_BROWSER_GEOLOCATION_GPS_LOCATION_PROVIDER_LINUX_H_
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "content/browser/geolocation/location_provider.h"
#include "content/common/content_export.h"
#include "content/public/common/geoposition.h"
struct gps_data_t;
namespace content {
// Defines a wrapper around the C libgps API (gps.h). Similar to the libgpsmm.h
// API provided by that package.
class CONTENT_EXPORT LibGps {
public:
virtual ~LibGps();
// Attempts to dynamically load the libgps.so library and returns NULL on
// failure.
static LibGps* New();
bool Start();
void Stop();
bool Read(content::Geoposition* position);
protected:
typedef int (*gps_open_fn)(const char*, const char*, struct gps_data_t*);
typedef int (*gps_close_fn)(struct gps_data_t*);
typedef int (*gps_read_fn)(struct gps_data_t*);
explicit LibGps(void* dl_handle,
gps_open_fn gps_open,
gps_close_fn gps_close,
gps_read_fn gps_read);
// Returns false if there is no fix available.
virtual bool GetPositionIfFixed(content::Geoposition* position);
private:
#if defined(USE_LIBGPS)
void* dl_handle_;
gps_open_fn gps_open_;
gps_close_fn gps_close_;
gps_read_fn gps_read_;
scoped_ptr<gps_data_t> gps_data_;
bool is_open_;
#endif // defined(USE_LIBGPS)
DISALLOW_COPY_AND_ASSIGN(LibGps);
};
// Location provider for Linux, that uses libgps/gpsd to obtain position fixes.
// TODO(joth): Currently this runs entirely in the client thread (i.e. Chrome's
// IO thread). As the older libgps API is not designed to support polling,
// there's a chance it could block, so better move this into its own worker
// thread.
class CONTENT_EXPORT GpsLocationProviderLinux : public LocationProviderBase {
public:
typedef LibGps* (*LibGpsFactory)();
// |factory| will be used to create the gpsd client library wrapper. (Note
// NewSystemLocationProvider() will use the default factory).
explicit GpsLocationProviderLinux(LibGpsFactory libgps_factory);
virtual ~GpsLocationProviderLinux();
void SetGpsdReconnectIntervalMillis(int value) {
gpsd_reconnect_interval_millis_ = value;
}
void SetPollPeriodMovingMillis(int value) {
poll_period_moving_millis_ = value;
}
void SetPollPeriodStationaryMillis(int value) {
poll_period_stationary_millis_ = value;
}
// LocationProvider
virtual bool StartProvider(bool high_accuracy) OVERRIDE;
virtual void StopProvider() OVERRIDE;
virtual void GetPosition(Geoposition* position) OVERRIDE;
virtual void UpdatePosition() OVERRIDE;
private:
// Task which run in the child thread.
void DoGpsPollTask();
// Will schedule a poll; i.e. enqueue DoGpsPollTask deferred task.
void ScheduleNextGpsPoll(int interval);
int gpsd_reconnect_interval_millis_;
int poll_period_moving_millis_;
int poll_period_stationary_millis_;
const LibGpsFactory libgps_factory_;
scoped_ptr<LibGps> gps_;
Geoposition position_;
// Holder for the tasks which run on the thread; takes care of cleanup.
base::WeakPtrFactory<GpsLocationProviderLinux> weak_factory_;
};
} // namespace content
#endif // CONTENT_BROWSER_GEOLOCATION_GPS_LOCATION_PROVIDER_LINUX_H_
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