POC lasy chisel entities

lazy_entity.ts

abstract class ChiselEntity {
    __data: any;
    __ctx_id: number;
    public Ready: Promise.IThenable<any>;
    public isReady = false;
}

class Person extends ChiselEntity {
    // these just end up as dummies
    name: string;
    other: Person;

    // this is generated
    constructor(id, ctx) {
        super();
        super.Ready = new Promise((resolve, reject) => {
            fetch_entity(id).then(val => {
                // profiling probe: report to the runtime how we got access to this object, so the runtime can make
                // smart decisions about smart loading entities next time.
                // deno.code.opSync("prof_probe", ctx);
                console.log(`called in the context: ${ctx}`);

                this.__data = val.data;
                this.__ctx_id = val.ctx_id;
                this.isReady = true;
                resolve(undefined)
            });

            Object.defineProperty(this, "name", {
                get: () => {
                    if (!this.isReady) {
                        throw "not ready";
                    }
                    return this.__data["name"];
                }
            });

            Object.defineProperty(this, "other", {
                get: () => {
                    if (!this.isReady) {
                        throw "not ready";
                    }
                    return new Person(20, {
                        type: "PropAccess",
                        parent: this,
                        prop: "other",
                    });
                }
            });
        })
    }
}

async function fetch_entity(id) {
    console.log(id)
    await new Promise(resolve => setTimeout(resolve, 1000));
    return {
        data: {
            name: "marin",
            other: id + 1,
        },
        ctx_id: getRandomInt(100),
    }
}

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

let person = new Person(10, undefined);

(async () => {
    await person.Ready;
    let other = person.other;
    console.log("here");
    await other.Ready;
    console.log(other.name);
})();