private static DeviceCacheItem GetFromCacheInternal(string id)
{
return(ExceptionUtility.Try <DeviceCacheItem>(() =>
{
DeviceCacheItem output = null;
if (id != null)
{
_cachedDevices.TryGetValue(id, out output);
}
return output;
}));
}
/// <summary>
/// Unregisters a listener from updates to a specific device.
/// </summary>
/// <param name="id">Id of the device for which to no longer receive updates</param>
/// <param name="callback">The callback listener</param>
public static void UnsubscribeFromDeviceUpdates(string id, Action <Device> callback)
{
ExceptionUtility.Try(() =>
{
DeviceCacheItem value = null;
if (_cachedDevices.TryGetValue(id, out value))
{
value.RemoveUpdateCallback(callback);
}
LogUtility.LogMessage(id + " unsubscribed from device updates.");
});
}
/// <summary>
/// Registers a listener for updates to a specific device.
/// </summary>
/// <param name="id">Id of the device for which to receive updates</param>
/// <param name="callback">The callback listener</param>
public static void SubscribeToDeviceUpdates(string id, Action <Device> callback)
{
ExceptionUtility.Try(() =>
{
DeviceCacheItem value = null;
if (_cachedDevices.TryGetValue(id, out value))
{
value.AddUpdateCallback(callback);
}
LogUtility.LogMessage(id + " subscribing to device updates.");
});
}
private static void AddOrUpdateInternal(Device device)
{
ExceptionUtility.Try(() =>
{
if (device != null)
{
if (device != null && !String.IsNullOrEmpty(device.Id))
{
if (device.Type == null)
{
device.Type = TryGetDeviceType(device.Id);
}
device.MergeFromMetadata();
var newItem = new DeviceCacheItem(device);
_cachedDevices.AddOrUpdate(device.Id, (k) =>
{
LogUtility.LogMessage("Device " + device.Id + " added to cache.");
return(newItem);
},
(k, v) =>
{
if (v.Device != null)
{
//then merge new data into old data
v.Device.MergeFromParent(newItem.Device, false, false);
LogUtility.LogMessage("Device " + device.Id + " updated in cache.");
}
else
{
v.Device = newItem.Device;
LogUtility.LogMessage("Device " + device.Id + " added to cache.");
}
foreach (var callback in v.UpdateCallbacks)
{
LogUtility.LogMessage("Calling callback event for device " + v.Device.Id);
callback(v.Device);
}
return(v);
});
LimitAlerts();
}
}
});
}
