コード例 #1
0
 /// <summary>
 /// Build the elements retrieving as required from the specified elements instance.
 /// </summary>
 public async void Build(Elements elements)
 {
     if (GetElement == null)
     {
         elements.Get(Key,
                      new Act <Element, Elements, IAction <Element> >(OnRootLoaded, null, elements, null));
     }
     else
     {
         OnRootLoaded(await GetElement.RunAsync(), elements, null);
     }
 }
コード例 #2
0
        /// <summary>
        /// Asynchronously fetch the item.
        /// </summary>
        public async Task <T> Fetch()
        {
            T reference;

            if (_set && _item.TryGetTarget(out reference))
            {
                return(reference);
            }
            reference = await GetItem.RunAsync();

            if (reference != null)
            {
                if (_set)
                {
                    _item.SetTarget(reference);
                }
                else
                {
                    _set  = true;
                    _item = new WeakReference <T>(reference);
                }
            }
            return(reference);
        }
コード例 #3
0
        /// <summary>
        /// Get the element asynchronously.
        /// </summary>
        public async Task <Element> GetAsync()
        {
            Element result = null;

            _lock.Take();

            if (_processing)
            {
                if (_element == null)
                {
                    _lock.Release();

                    if (_path == null)
                    {
                        result = await _getElement.RunAsync();
                    }
                    else
                    {
                        var parser = new ElementParser(_path).RunSync();
                        if (parser.Error == null)
                        {
                            result = parser.Root;
                        }
                        else
                        {
                            Log.Error("Element parser error. " + parser.Error);
                        }
                    }

                    if (result == null)
                    {
                        return(null);
                    }

                    if (_onBuild != null)
                    {
                        _onBuild.ArgA = result;
                        _onBuild.Run();
                    }
                }
                else
                {
                    result = _element.Clone();

                    _lock.Release();
                }

                return(result);
            }

            // check if the link has or should be updated
            if (_element == null)
            {
                if (_path == null)
                {
                    result = await _getElement.RunAsync();
                }
                else
                {
                    var parser = new ElementParser(_path).RunSync();
                    if (parser.Error == null)
                    {
                        result = parser.Root;
                    }
                    else
                    {
                        _lock.Release();
                        Log.Error("Element parser error. " + parser.Error);
                        return(null);
                    }
                }

                _element = result;

                if (_onBuild != null)
                {
                    _onBuild.ArgA = _element;
                    _onBuild.Run();
                }

                if (_cacheTime > 0)
                {
                    _nextUpdate = Time.Milliseconds + _cacheTime;
                }
                else
                {
                    _nextUpdate = long.MaxValue;
                }
            }
            else
            {
                if (_nextUpdate < Time.Milliseconds)
                {
                    if (_path == null)
                    {
                        result = await _getElement.RunAsync();

                        if (result == null)
                        {
                            _lock.Release();
                            return(null);
                        }
                    }
                    else
                    {
                        var parser = new ElementParser(_path).RunSync();
                        if (parser.Error != null)
                        {
                            _lock.Release();
                            Log.Error("Element parser error. " + parser.Error);
                            return(null);
                        }
                        result = parser.Root;
                    }

                    _element = result;

                    if (_onBuild != null)
                    {
                        _onBuild.ArgA = _element;
                        _onBuild.Run();
                    }

                    if (_cacheTime > 0)
                    {
                        _nextUpdate = Time.Milliseconds + _cacheTime;
                    }
                    else
                    {
                        _nextUpdate = long.MaxValue;
                    }
                }
            }

            // iterate and run the callbacks
            foreach (var callback in _callbacks)
            {
                callback.ArgA = _element.Clone();
                ManagerUpdate.Control.AddSingle(callback);
            }

            _callbacks.Clear();

            result = _element.Clone();

            _lock.Release();

            return(result);
        }