dino-core
Version:
A dependency injection framework for NodeJS applications
86 lines • 3.71 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.ApplicationContextBuilder = void 0;
const Logger_1 = require("../Logger");
const ApplicationContextHelper_1 = require("./ApplicationContextHelper");
/**
* Build the application context starting from the provided configuration
*
* @public
* @since 0.0.1
*/
class ApplicationContextBuilder {
/**
* @constructor
*/
constructor() {
this.applicationContextHelper = new ApplicationContextHelper_1.ApplicationContextHelper();
}
/**
* Build the application context.
* @param {Array<ComponentDescriptor>} componentDescriptors the component descriptors holding the loading information for components
* @param {ApplicationContext} context the application context where components will be registered
*
* @returns {Promise<ApplicationContext>} a promise resolved with the updated application context
* @public
*/
async build(componentDescriptors, context) {
let failed = [];
const environment = context.resolve('environment');
const dependencyTree = this.applicationContextHelper.buildDependencyTree(componentDescriptors, environment.getOrDefault('dino:dependencyTree:enabled', true));
for (const [level, components] of dependencyTree) {
for (let index = 0; index < components.length; index++) {
const componentDescriptor = components[index];
Logger_1.Logger.debug(`computing ${componentDescriptor.getName()} at level ${Symbol.keyFor(level.valueOf())}`);
this.tryRegisterOrRecordFailure(context, componentDescriptor, failed);
}
}
let retry = 0;
while (failed.length > 0 && retry < 5) {
const newFailures = [];
for (let index = 0; index < failed.length; index++) {
const component = failed[index];
this.tryRegisterOrRecordFailure(context, component, newFailures);
}
failed = newFailures;
retry++;
}
if (failed.length > 0) {
throw Error(`unable to resolve all dependencies ${failed.map((cd) => cd.getName()).join(',')}`);
}
return context;
}
/**
* Try register a component on this context
*
* @param {ApplicationContext} context the application context
* @param {ComponentDescriptor} componentDescriptor the component descriptor
* @param {Array<ComponentDescriptor>} accumulator the accumulator for failed registrations
*
* @private
*/
tryRegisterOrRecordFailure(context, componentDescriptor, accumulator) {
try {
context.add(componentDescriptor);
}
catch (error) {
Logger_1.Logger.debug(`>>> unable to register component ${componentDescriptor.getName()}: ${error}`);
accumulator.push(componentDescriptor);
}
}
}
exports.ApplicationContextBuilder = ApplicationContextBuilder;
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