mirror of
https://github.com/musix-org/musix-oss
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282 lines
11 KiB
JavaScript
282 lines
11 KiB
JavaScript
import { Deferred } from '@firebase/util';
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/**
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* Component for service name T, e.g. `auth`, `auth-internal`
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*/
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class Component {
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/**
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*
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* @param name The public service name, e.g. app, auth, firestore, database
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* @param instanceFactory Service factory responsible for creating the public interface
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* @param type whether the service provided by the component is public or private
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*/
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constructor(name, instanceFactory, type) {
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this.name = name;
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this.instanceFactory = instanceFactory;
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this.type = type;
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this.multipleInstances = false;
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/**
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* Properties to be added to the service namespace
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*/
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this.serviceProps = {};
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this.instantiationMode = "LAZY" /* LAZY */;
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}
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setInstantiationMode(mode) {
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this.instantiationMode = mode;
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return this;
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}
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setMultipleInstances(multipleInstances) {
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this.multipleInstances = multipleInstances;
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return this;
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}
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setServiceProps(props) {
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this.serviceProps = props;
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return this;
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}
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}
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/**
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* @license
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* Copyright 2019 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const DEFAULT_ENTRY_NAME = '[DEFAULT]';
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/**
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* @license
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* Copyright 2019 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Provider for instance for service name T, e.g. 'auth', 'auth-internal'
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* NameServiceMapping[T] is an alias for the type of the instance
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*/
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class Provider {
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constructor(name, container) {
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this.name = name;
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this.container = container;
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this.component = null;
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this.instances = new Map();
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this.instancesDeferred = new Map();
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}
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/**
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* @param identifier A provider can provide mulitple instances of a service
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* if this.component.multipleInstances is true.
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*/
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get(identifier = DEFAULT_ENTRY_NAME) {
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// if multipleInstances is not supported, use the default name
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const normalizedIdentifier = this.normalizeInstanceIdentifier(identifier);
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if (!this.instancesDeferred.has(normalizedIdentifier)) {
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const deferred = new Deferred();
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this.instancesDeferred.set(normalizedIdentifier, deferred);
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// If the service instance is available, resolve the promise with it immediately
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try {
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const instance = this.getOrInitializeService(normalizedIdentifier);
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if (instance) {
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deferred.resolve(instance);
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}
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}
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catch (e) {
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// when the instance factory throws an exception during get(), it should not cause
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// a fatal error. We just return the unresolved promise in this case.
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}
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}
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return this.instancesDeferred.get(normalizedIdentifier).promise;
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}
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getImmediate(options) {
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const { identifier, optional } = Object.assign({ identifier: DEFAULT_ENTRY_NAME, optional: false }, options);
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// if multipleInstances is not supported, use the default name
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const normalizedIdentifier = this.normalizeInstanceIdentifier(identifier);
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try {
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const instance = this.getOrInitializeService(normalizedIdentifier);
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if (!instance) {
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if (optional) {
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return null;
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}
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throw Error(`Service ${this.name} is not available`);
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}
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return instance;
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}
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catch (e) {
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if (optional) {
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return null;
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}
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else {
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throw e;
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}
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}
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}
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getComponent() {
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return this.component;
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}
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setComponent(component) {
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if (component.name !== this.name) {
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throw Error(`Mismatching Component ${component.name} for Provider ${this.name}.`);
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}
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if (this.component) {
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throw Error(`Component for ${this.name} has already been provided`);
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}
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this.component = component;
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// if the service is eager, initialize the default instance
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if (isComponentEager(component)) {
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try {
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this.getOrInitializeService(DEFAULT_ENTRY_NAME);
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}
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catch (e) {
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// when the instance factory for an eager Component throws an exception during the eager
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// initialization, it should not cause a fatal error.
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// TODO: Investigate if we need to make it configurable, because some component may want to cause
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// a fatal error in this case?
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}
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}
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// Create service instances for the pending promises and resolve them
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// NOTE: if this.multipleInstances is false, only the default instance will be created
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// and all promises with resolve with it regardless of the identifier.
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for (const [instanceIdentifier, instanceDeferred] of this.instancesDeferred.entries()) {
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const normalizedIdentifier = this.normalizeInstanceIdentifier(instanceIdentifier);
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try {
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// `getOrInitializeService()` should always return a valid instance since a component is guaranteed. use ! to make typescript happy.
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const instance = this.getOrInitializeService(normalizedIdentifier);
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instanceDeferred.resolve(instance);
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}
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catch (e) {
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// when the instance factory throws an exception, it should not cause
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// a fatal error. We just leave the promise unresolved.
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}
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}
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}
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clearInstance(identifier = DEFAULT_ENTRY_NAME) {
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this.instancesDeferred.delete(identifier);
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this.instances.delete(identifier);
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}
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// app.delete() will call this method on every provider to delete the services
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// TODO: should we mark the provider as deleted?
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async delete() {
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const services = Array.from(this.instances.values());
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await Promise.all(services
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.filter(service => 'INTERNAL' in service)
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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.map(service => service.INTERNAL.delete()));
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}
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isComponentSet() {
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return this.component != null;
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}
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getOrInitializeService(identifier) {
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let instance = this.instances.get(identifier);
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if (!instance && this.component) {
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instance = this.component.instanceFactory(this.container, normalizeIdentifierForFactory(identifier));
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this.instances.set(identifier, instance);
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}
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return instance || null;
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}
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normalizeInstanceIdentifier(identifier) {
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if (this.component) {
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return this.component.multipleInstances ? identifier : DEFAULT_ENTRY_NAME;
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}
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else {
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return identifier; // assume multiple instances are supported before the component is provided.
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}
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}
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}
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// undefined should be passed to the service factory for the default instance
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function normalizeIdentifierForFactory(identifier) {
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return identifier === DEFAULT_ENTRY_NAME ? undefined : identifier;
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}
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function isComponentEager(component) {
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return component.instantiationMode === "EAGER" /* EAGER */;
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}
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/**
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* @license
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* Copyright 2019 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* ComponentContainer that provides Providers for service name T, e.g. `auth`, `auth-internal`
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*/
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class ComponentContainer {
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constructor(name) {
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this.name = name;
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this.providers = new Map();
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}
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/**
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*
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* @param component Component being added
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* @param overwrite When a component with the same name has already been registered,
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* if overwrite is true: overwrite the existing component with the new component and create a new
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* provider with the new component. It can be useful in tests where you want to use different mocks
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* for different tests.
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* if overwrite is false: throw an exception
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*/
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addComponent(component) {
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const provider = this.getProvider(component.name);
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if (provider.isComponentSet()) {
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throw new Error(`Component ${component.name} has already been registered with ${this.name}`);
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}
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provider.setComponent(component);
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}
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addOrOverwriteComponent(component) {
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const provider = this.getProvider(component.name);
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if (provider.isComponentSet()) {
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// delete the existing provider from the container, so we can register the new component
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this.providers.delete(component.name);
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}
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this.addComponent(component);
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}
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/**
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* getProvider provides a type safe interface where it can only be called with a field name
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* present in NameServiceMapping interface.
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*
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* Firebase SDKs providing services should extend NameServiceMapping interface to register
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* themselves.
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*/
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getProvider(name) {
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if (this.providers.has(name)) {
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return this.providers.get(name);
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}
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// create a Provider for a service that hasn't registered with Firebase
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const provider = new Provider(name, this);
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this.providers.set(name, provider);
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return provider;
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}
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getProviders() {
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return Array.from(this.providers.values());
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}
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}
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export { Component, ComponentContainer, Provider };
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//# sourceMappingURL=index.esm2017.js.map
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