An interface for implementing asynchronous execution of algorithms for mql5, like Promise in JavaScript.
npm install mql5-promiseAn interface for implementing asynchronous execution of algorithms for mql5, like Promise in JavaScript.
Example Promise :
``mql5
`
void OnInit() {
new Promise(printAndTimoutResolve, "111")
.then(printAndReject, "222") // then - run if prev promise is resolved
.ccatch(printAndResolve, "333") // ccatch - run if prev promise is rejected
.ccatch(printAndResolve, "444")
.ccatch(printAndResolve, "555")
.then(printAndResolve, "666")
.finally(printAndResolve, "end") // finally - run anything
.destroy(); // clear memory theese promises after execution all promises
Print("start");
// printAndTimoutResolve 111 // timeout after Print
// start
// printAndReject 222
// printAndTimoutResolve 333
// printAndTimoutResolve 666
// printAndTimoutResolve end
};
void promiseAllResolve(ulong promiseId, string &prevResult[], string parametr) {
Print("promiseAllResolve " + parametr);
};
void printAndTimoutResolve(ulong promiseId, string prevResult, string parametr) {
Print("printAndTimoutResolve " + parametr);
Timer::setTimout(resolveByIdStr, 2000, string(promiseId));
};
void resolveByIdStr(string id) { Promise::resolveById(ulong(id)); }
void printAndResolve(ulong promiseId, string prevResult, string parametr) {
Print("printAndResolve " + parametr);
Promise::resolveById(promiseId);
};
void printAndReject(ulong promiseId, string prevResult, string parametr) {
Print("printAndReject " + parametr);
Promise::rejectById(promiseId);
};
`
Example Promise:all :
mql5
`
void OnInit() {
Promise* list1[] = {
new Promise(printAndTimoutResolve, "Promise 1")
.then(printAndTimoutResolve, "Promise 1.1")
,
new Promise(printAndReject, "Promise 2"),
new Promise(printAndTimoutResolve, "Promise 3"),
};
Promise::all(list1, promiseAllResolve) // resolve if all promises are resolved
.then(printAndResolve, "Promise::all resolved")
.ccatch(printAndResolve, "Promise::all rejected")
.destroy(); // delete all promises
// printAndTimoutResolve Promise 1
// printAndReject Promise 2
// printAndTimoutResolve Promise 3
// printAndResolve Promise::all rejected
};
`
Example Promise:race :
mql5
`
void OnInit() {
Promise* list2[] = {
new Promise(printAndTimoutResolve, "Promise 1")
.then(printAndTimoutResolve, "Promise 1.1")
,
new Promise(printAndReject, "Promise 2"),
new Promise(printAndTimoutResolve, "Promise 3"),
};
Promise::race(list2, printAndResolve, "Promise::race") // resolve/reject after the first promise
.then(printAndResolve, "Promise::race resolved")
.ccatch(printAndResolve, "Promise::race rejected")
.destroy();
// printAndTimoutResolve Promise 1
// printAndReject Promise 2
// printAndTimoutResolve Promise 3
// Promise::race rejected
};
`
Example Promise:any :
mql5
``
void OnInit() {
Promise* list3[] = {
new Promise(printAndTimoutResolve, "Promise 1")
.then(printAndTimoutResolve, "Promise 1.1")
,
new Promise(printAndReject, "Promise 2"),
new Promise(printAndTimoutResolve, "Promise 3"),
};
Promise::any(list3, printAndResolve, "Promise::any")
.then(printAndResolve, "Promise::any resolved")
.ccatch(printAndResolve, "Promise::any rejected")
.destroy();
// printAndTimoutResolve Promise 1
// printAndReject Promise 2
// printAndTimoutResolve Promise 3
// printAndResolve Promise::any
// printAndResolve Promise::any resolved
};