Lockable.js

function Lockable() {
    this.deferred = $.Deferred();
    this.locks = {};
}

Lockable.prototype.lock = function (lockName) {
    this.locks[lockName] = true;
    return this;
}

Lockable.prototype.unlock = function (lockName) {
    delete this.locks[lockName];
    if (!this.hasLocks()) {
        this.deferred.resolve();
        this.reset();
    }
    return this;
}

Lockable.prototype.seal = function (errorMessage) {
    this.deferred.reject(errorMessage);
    this.locks[".seal"] = true;
    return this;
}

Lockable.prototype.onOpen = function (successCallback) {
    successCallback && this.deferred.done(successCallback);
    
    if (!this.hasLocks()) {
        this.deferred.resolve();
        this.reset();
    }
    return this;
}

Lockable.prototype.onSeal = function (failCallback){
    failCallback && this.deferred.fail(failCallback);
    return this;
}

Lockable.prototype.reset = function (){
    this.deferred = $.Deferred();
    this.locks = {};
    return this;
}

Lockable.prototype.hasLocks = function () {
    return !!Object.keys(this.locks).length;
}

Lockable.prototype.status = function () {
    var self = this;
    return {
        isOpen : !self.hasLocks(),
        isSealed : !!self.locks[".seal"],
        locks : Object.keys(self.locks)
    };
}