During the execution of an asynchronous operation, is it handled as a Sequential call or Parallel call at runtime?
- Can you explain how the
$qhandles this?- Please provide a brief explanation of the differences between Sequential and Parallel execution in Angular's $q.
When it comes to Parallel Execution, the processes run simultaneously without waiting for one another to finish. On the other hand, Sequential Execution follows an order where processes are executed one after the other.
The $q service is primarily used for asynchronous calls, which includes parallel execution and promise handling. By default, it prioritizes parallel execution over sequential execution. If you require sequential execution, you will need to manage it manually by making subsequent calls only after receiving a response from the previous call.
var promise;
promise.then(function(){
var newPromise;
newPromise.then(function(){
})
})
To run promises concurrently:
var promise1 = promiseAPI(params1);
var promise2 = promiseAPI(params2);
var promise1and2 = $q.all([promise1, promise2]);
To run promises in sequence, send back the next promise to the first promise success handler:
var promise1 = promiseAPI(params1);
var promise1then2 = promise1.then(function() {
var promise2 = promiseAPI(params2);
//return for chaining
return promise2;
});
By using the .then method of a promise, it is straightforward to create a chain of promises. This allows for chains of varying lengths and since a promise can be resolved with another promise (which will delay its resolution further), you can pause/defer resolution of the promises at any point in the chain.
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