diff options
Diffstat (limited to 'chromeos/dbus/bluetooth_gatt_characteristic_service_provider.h')
-rw-r--r-- | chromeos/dbus/bluetooth_gatt_characteristic_service_provider.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/chromeos/dbus/bluetooth_gatt_characteristic_service_provider.h b/chromeos/dbus/bluetooth_gatt_characteristic_service_provider.h new file mode 100644 index 0000000..174a908 --- /dev/null +++ b/chromeos/dbus/bluetooth_gatt_characteristic_service_provider.h @@ -0,0 +1,113 @@ +// Copyright 2014 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 CHROMEOS_DBUS_BLUETOOTH_GATT_CHARACTERISTIC_SERVICE_PROVIDER_H_ +#define CHROMEOS_DBUS_BLUETOOTH_GATT_CHARACTERISTIC_SERVICE_PROVIDER_H_ + +#include <string> +#include <vector> + +#include "base/basictypes.h" +#include "base/callback.h" +#include "chromeos/chromeos_export.h" +#include "dbus/bus.h" +#include "dbus/object_path.h" + +namespace chromeos { + +// BluetoothGattCharacteristicServiceProvider is used to provide a D-Bus object +// that represents a local GATT characteristic that the Bluetooth daemon can +// communicate with. +// +// Instantiate with a chosen D-Bus object path, delegate, and other fields. +// The Bluetooth daemon communicates with a GATT characteristic using the +// standard DBus.Properties interface. While most properties of the GATT +// characteristic interface are read-only and don't change throughout the +// life-time of the object, the "Value" property is both writeable and its +// value can change. Both Get and Set operations performed on the "Value" +// property are delegated to the Delegate object, an instance of which is +// mandatory during initialization. In addition, a "SendValueChanged" method is +// provided, which emits a DBus.Properties.PropertyChanged signal for the +// "Value" property. +class CHROMEOS_EXPORT BluetoothGattCharacteristicServiceProvider { + public: + // Interface for reacting to GATT characteristic value requests. + class Delegate { + public: + virtual ~Delegate() {} + + // ValueCallback is used for methods that require a characteristic value + // to be returned. + typedef base::Callback<void(const std::vector<uint8>&)> ValueCallback; + + // ErrorCallback is used by methods to report failure. + typedef base::Closure ErrorCallback; + + // This method will be called when a remote device requests to read the + // value of the exported GATT characteristic. Invoke |callback| with a value + // to return that value to the requester. Invoke |error_callback| to report + // a failure to read the value. This can happen, for example, if the + // characteristic has no read permission set. Either callback should be + // invoked after a reasonable amount of time, since the request will time + // out if left pending for too long. + virtual void GetCharacteristicValue( + const ValueCallback& callback, + const ErrorCallback& error_callback) = 0; + + // This method will be called, when a remote device requests to write the + // value of the exported GATT characteristic. Invoke |callback| to report + // that the value was successfully written. Invoke |error_callback| to + // report a failure to write the value. This can happen, for example, if the + // characteristic has no write permission set. Either callback should be + // invoked after a reasonable amount of time, since the request will time + // out if left pending for too long. + // + // The delegate should use this method to perform any side-effects that may + // occur based on the set value and potentially send a property changed + // signal to notify the Bluetooth daemon that the value has changed. + virtual void SetCharacteristicValue( + const std::vector<uint8>& value, + const base::Closure& callback, + const ErrorCallback& error_callback) = 0; + }; + + virtual ~BluetoothGattCharacteristicServiceProvider(); + + // Send a PropertyChanged signal to notify the Bluetooth daemon that the value + // of the "Value" property has changed to |value|. + virtual void SendValueChanged(const std::vector<uint8>& value) = 0; + + // Creates the instance, where |bus| is the D-Bus bus connection to export + // the object onto, |uuid| is the 128-bit GATT characteristic UUID, + // |flags| is the list of GATT characteristic properties, |permissions| is the + // list of attribute permissions, |service_path| is the object path of the + // exported GATT service the characteristic belongs to, |object_path| is the + // object path that the characteristic should have, and |delegate| is the + // object that "Value" Get/Set requests will be passed to and responses + // generated from. + // + // Object paths of GATT characteristics must be hierarchical to the path of + // the GATT service they belong to. Hence, |object_path| must have + // |service_path| as its prefix. Ownership of |delegate| is not taken, thus + // the delegate should outlive this instance. A delegate should handle only + // a single exported characteristic and own it. + static BluetoothGattCharacteristicServiceProvider* Create( + dbus::Bus* bus, + const dbus::ObjectPath& object_path, + Delegate* delegate, + const std::string& uuid, + const std::vector<std::string>& flags, + const std::vector<std::string>& permissions, + const dbus::ObjectPath& service_path); + + protected: + BluetoothGattCharacteristicServiceProvider(); + + private: + DISALLOW_COPY_AND_ASSIGN(BluetoothGattCharacteristicServiceProvider); +}; + +} // namespace chromeos + +#endif // CHROMEOS_DBUS_BLUETOOTH_GATT_CHARACTERISTIC_SERVICE_PROVIDER_H_ |