dino-core
Version:
A dependency injection framework for NodeJS applications
54 lines • 2.23 kB
JavaScript
;
// Copyright 2018 Quirino Brizi [quirino.brizi@gmail.com]
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
Object.defineProperty(exports, "__esModule", { value: true });
exports.LazyLoadingResolver = void 0;
class LazyLoadingResolver {
/**
*
* @param {ApplicationContext} applicationContext
* @param {ComponentDescriptor} componentDescriptor
*/
constructor(applicationContext, componentDescriptor) {
this.applicationContext = applicationContext;
this.componentDescriptor = componentDescriptor;
this.targetRegistered = false;
}
get(_target, property, receiver) {
if (['postConstruct', 'preDestroy'].includes(property)) {
// no lifecycle to execute for a proxy...
return;
}
return Reflect.get(this.loadInstanceIfRequired(), property, receiver);
}
/**
* Ensure that the component instance is loaded before interacting with it.
* As the component will be loaded from the application context it will therefore ensure that
* its lifecycle is executed.
*
* @private
*/
loadInstanceIfRequired() {
const name = `dinoConcreteInstanceForLazy_${this.componentDescriptor.getName()}`;
if (this.targetRegistered) {
// Here we resolve to make sure that if lifecycle is transient it is executed
return this.applicationContext.resolve(name);
}
const answer = this.applicationContext.register(name, this.componentDescriptor);
this.targetRegistered = true;
return answer;
}
}
exports.LazyLoadingResolver = LazyLoadingResolver;
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