I'm testing a component where I upload a file, convert to base64 and split into several CHUNK Parts send each one to an apex method.
This component seems quite common online. Like:
Bellow, is the method that performs my invocation to apex
uploadInChunk: function(component, file, fileContents, startPosition, endPosition, actualPart, totalParts) {
var filePart= fileContents.substring(startPosition, endPosition);
var action = component.get("c.uploadDocument");
action.setParams({
actualPart: String(actualPart),
totalParts : String(totalParts),
recordID : component.get('v.recordID'),
part : filePart
});
action.setCallback(this, function(response) {
var state = response.getState();
if (state === "SUCCESS") {
startPosition = endPosition;
endPosition = Math.min(fileContents.length, startPosition + this.CHUNK_SIZE);
if (startPosition < endPosition) {
this.uploadInChunk(component, file, fileContents, startPosition,endPosition,(actualPart+1),totalParts);
} else {
this.showToast(component,$A.get("$Label.c.uploading"), 'Info');
}
} else if (state === "INCOMPLETE") {
this.showToast(component, $A.get("$Label.c.Fail"), 'Error');
} else if (state === "ERROR") {
this.showToast(component, Error, 'Error');
var errors = response.getError();
if (errors) {
if (errors[0] && errors[0].message) {
console.log("Error message: " + errors[0].message);
component.set("v.showLoadingSpinner", false);
}
} else {
console.log("Unknown error");
}
}
});
$A.enqueueAction(action);
My issue is about the perfomance.
The apex method only invokes a future method so the transaction is fast, however the callback to javascript takes a few more seconds. When I have 30/40 parts it delays the whole process to some minutes.
I realized that the filePart, being a very large String, passing as an input is the most delaying cause. (Commenting that input turns the callbacks much more faster :P )
I found something about promises and I still try to perform the invocation outside the setCallback, since I really don't need the response. But I couldn't manage that.
Can you help me on that?
