@loopback/core
Version:
Define and implement core constructs such as Application and Component
56 lines • 2.17 kB
JavaScript
;
// Copyright IBM Corp. and LoopBack contributors 2018,2020. All Rights Reserved.
// Node module: @loopback/core
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
Object.defineProperty(exports, "__esModule", { value: true });
exports.lifeCycleObserver = exports.lifeCycleObserverFilter = exports.asLifeCycleObserver = exports.isLifeCycleObserverClass = exports.isLifeCycleObserver = void 0;
const context_1 = require("@loopback/context");
const keys_1 = require("./keys");
const lifeCycleMethods = ['init', 'start', 'stop'];
/**
* Test if an object implements LifeCycleObserver
* @param obj - An object
*/
function isLifeCycleObserver(obj) {
const candidate = obj;
return lifeCycleMethods.some(m => typeof candidate[m] === 'function');
}
exports.isLifeCycleObserver = isLifeCycleObserver;
/**
* Test if a class implements LifeCycleObserver
* @param ctor - A class
*/
function isLifeCycleObserverClass(ctor) {
return ctor.prototype && isLifeCycleObserver(ctor.prototype);
}
exports.isLifeCycleObserverClass = isLifeCycleObserverClass;
/**
* A `BindingTemplate` function to configure the binding as life cycle observer
* by tagging it with `CoreTags.LIFE_CYCLE_OBSERVER`.
*
* @param binding - Binding object
*/
function asLifeCycleObserver(binding) {
return binding.tag(keys_1.CoreTags.LIFE_CYCLE_OBSERVER);
}
exports.asLifeCycleObserver = asLifeCycleObserver;
/**
* Find all life cycle observer bindings. By default, a binding tagged with
* `CoreTags.LIFE_CYCLE_OBSERVER`. It's used as `BindingFilter`.
*/
exports.lifeCycleObserverFilter = (0, context_1.filterByTag)(keys_1.CoreTags.LIFE_CYCLE_OBSERVER);
/**
* Sugar decorator to mark a class as life cycle observer
* @param group - Optional observer group name
* @param specs - Optional bindings specs
*/
function lifeCycleObserver(group = '', ...specs) {
return (0, context_1.injectable)(asLifeCycleObserver, {
tags: {
[keys_1.CoreTags.LIFE_CYCLE_OBSERVER_GROUP]: group,
},
}, ...specs);
}
exports.lifeCycleObserver = lifeCycleObserver;
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