public static string GetNodeJSON(string type, string key = null, string property = null, bool includeCaches = false)
{
if (key.IsNullOrEmpty())
{
var nodesToSerialize = PollingEngine.GetNodes(type).Select(n => NodeData.FromNode(n));
return(JsonConvert.SerializeObject(nodesToSerialize, _serializationSettings));
}
var node = PollingEngine.GetNode(type, key);
if (node == null)
{
throw new DataPullException("No {0} node found with key: {1}", type, key);
}
// Node level
if (property.IsNullOrEmpty())
{
var nodeToSerialize = NodeData.FromNode(node, includeCaches);
return(JsonConvert.SerializeObject(nodeToSerialize, _serializationSettings));
}
var cache = node.GetCache(property);
if (cache == null)
{
throw new DataPullException("{0} node was found, but no cache for property: {1}", node.NodeType, property);
}
var cacheToSerialize = CacheData.FromCache(cache, includeCaches);
return(JsonConvert.SerializeObject(cacheToSerialize, _serializationSettings));
}
public Task StartAsync(CancellationToken cancellationToken)
{
_cancellationToken = cancellationToken;
_logger.LogInformation("Polling service is starting.");
PollingEngine.StartPolling(_cancellationToken);
return(Task.CompletedTask);
}
/// <summary>
/// Tries added this node to the global polling engine. If another copy of this node is present (same unique key)
/// then this method will return false, indicating it was not added and will not be polled.
/// </summary>
/// <remarks>If this return FALSE, be sure not to cache the node anywhere else, as it should likely be garbage collected</remarks>
/// <returns>Whether the node was added to the list of global pollers</returns>
public bool TryAddToGlobalPollers()
{
return(AddedToGlobalPollers = PollingEngine.TryAdd(this));
}
public void Dispose()
{
PollingEngine.TryRemove(this);
}
/// <summary>
/// Tries added this node to the global polling engine. If another copy of this node is present (same unique key)
/// then this method will return false, indicating it was not added and will not be polled.
/// </summary>
/// <remarks>If this return FALSE, be sure not to cache the node anywhere else, as it should likely be garbage collected</remarks>
/// <returns>Whether the node was added to the list of global pollers</returns>
public bool TryAddToGlobalPollers()
{
AddedToGlobalPollers = PollingEngine.TryAdd(this);
RegisterProviders();
return(AddedToGlobalPollers);
}
public Task StopAsync(CancellationToken cancellationToken)
{
_logger.LogInformation("Polling service is stopping.");
PollingEngine.StopPolling();
return(Task.CompletedTask);
}
