In simple term i come to conclusion that – Queue– There are 3 Types of Queue i.e. 1 Main Queue, 4 Global Queue and Any No. of Custom Queues. Threads– One is Main Thread and other background threads which system provides to us. DispatchQueue.main.async -It means performing task in main queue with using of background … Read more
You want the Microsoft.Bcl.Async package. That’s a properly released, non-CTP package that is stable. This also requires VS2012 since an updated compiler is needed to understand async and await. In theory one could use older tools from VS2010 along with the older CTP library, I’d strongly recommend that you don’t – it has bugs and … Read more
Does this get anywhere near your requirements? The behaviour falls somewhere between ExecutionAndPublication and PublicationOnly. While the initializer is in-flight all calls to Value will be handed the same task (which is cached temporarily but could subsequently succeed or fail); if the initializer succeeds then that completed task is cached permanently; if the initializer fails … Read more
What I have done is populate a Queue containing all my urls, then I download each item in the queue. When there are no items left, I can then process all the items. I’ve mocked some code up below. Keep in mind, the code below is for downloading strings and not files. It shouldn’t be … Read more
GetOrAdd won’t become an asynchronous operation because accessing the value of a dictionary isn’t a long running operation. What you can do however is simply store tasks in the dictionary, rather than the materialized result. Anyone needing the results can then await that task. However, you also need to ensure that the operation is only … Read more
Promise.all accepts an Array of Promise objects. You’re getting an Array of undefined because you’re not returning any Promise in your map callback: function addText(queries) { return Promise.all(queries.map(function(query) { // Add `return` here or the `map` returns an Array of `undefined`. return models.queries .findById(query.queryId, { raw: true, attributes: [ “query” ] }) .then(function(queryFetched) { query.text … Read more
OK, so there are 3 types of methods in CompletableFuture. For example: thenApply() thenApplyAsync(Function) (without an Executor) thenApplyAsync(Function, Executor) (with an Executor) The last one means that this action will execute in the Executor that you pass to it and it is the most obvious one. The second one means that the action is executed … Read more
Judging from some old code (6.7.2), it appears that the mysql ADO.NET provider does not implement any of the async functionality correctly. This includes the TAP pattern and the older style Begin…, End… async patterns. In that version, the Db* async methods appear to not be written at all; they would be using the base … Read more
Wait for any task and return the task if the condition is met. Otherwise wait again for the other tasks until there is no more task to wait for. public static async Task<Task> WhenAny( IEnumerable<Task> tasks, Predicate<Task> condition ) { var tasklist = tasks.ToList(); while ( tasklist.Count > 0 ) { var task = await … Read more
This is probably best handled as an instance method you add to teamSchema so that the caller can provide a callback to receive the async result: teamSchema.methods.getSquad = function(callback) { Players.find({ team_id: this._id }, callback); });