Guide to iterating through a queue of promises (sequentially handling asynchronous messages)

Question

Guide to iterating through a queue of promises (sequentially handling asynchronous messages)

Currently, I am working on processing a queue of promises (which are representations of messages) in a specific order and using AngularJS for the task.

Just to give you an idea, let's say that I have a method called connect() which returns a promise for establishing a connection, followed by msgQueue, which is essentially a JavaScript array consisting of promises where each represents a message.

To kick things off, my initial steps would involve:

connect().then(function(){
    return msgQueue.dequeue();
});

// Figuring out how to handle async looping through all the messages... Any suggestions?

I must admit that I am relatively new to Defer/Promise concepts, so any patience or guidance from experienced folks like you will be greatly appreciated!

Thank you in advance!

javascript angularjs promise deferred

Answer 1

Answer №1

function handleAsyncSerialization(queue, operation) {
  var message = queue.dequeue();
  if (message) message.then(function(data) { operation(data); handleAsyncSerialization(queue, operation); });
}

setUpConnection().then(function() { handleAsyncSerialization(messageQueue, processData); });

I believe this approach will be successful. Initially, we wait for the connection to establish by resolving setUpConnection. Then, the messageQueue is passed in. We extract the first message from the queue, set its resolve function to process the data, and then recursively continue with the remaining messages in the queue until it's empty.

Answer 2

function handleAsyncSerialization(queue, operation) {
  var message = queue.dequeue();
  if (message) message.then(function(data) { operation(data); handleAsyncSerialization(queue, operation); });
}

setUpConnection().then(function() { handleAsyncSerialization(messageQueue, processData); });

I believe this approach will be successful. Initially, we wait for the connection to establish by resolving setUpConnection. Then, the messageQueue is passed in. We extract the first message from the queue, set its resolve function to process the data, and then recursively continue with the remaining messages in the queue until it's empty.

Answer 3

Answer №2

This approach seems effective. It is based on the assumption that msgQueue.dequeue() will return a promise.

function handleWork(work) {
    work().then(function(data) {
       // process data
       msgQueue.dequeue().then(function(nextWork) {
           handleWork(nextWork);
       });
    });
}

Answer 4

This approach seems effective. It is based on the assumption that msgQueue.dequeue() will return a promise.

function handleWork(work) {
    work().then(function(data) {
       // process data
       msgQueue.dequeue().then(function(nextWork) {
           handleWork(nextWork);
       });
    });
}

Guide to iterating through a queue of promises (sequentially handling asynchronous messages)

Answer №1

Answer №2

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