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import { ActivationContext } from "./ActivationContext";
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import { Descriptor, ActivationType, ServiceMap, isDescriptor } from "./interfaces";
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import { Container } from "./Container";
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import { argumentNotNull, isPrimitive, oid, isPromise } from "../safe";
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import { Constructor, Factory } from "../interfaces";
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import { TraceSource } from "../log/TraceSource";
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let cacheId = 0;
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const trace = TraceSource.get("@implab/core/di/ActivationContext");
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function injectMethod(target, method, context, args) {
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const m = target[method];
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if (!m)
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throw new Error("Method '" + method + "' not found");
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if (args instanceof Array)
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return m.apply(target, context.parse(args, "." + method));
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else
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return m.call(target, context.parse(args, "." + method));
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}
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function makeClenupCallback(target, method: ((instance) => void) | string) {
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if (typeof (method) === "string") {
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return () => {
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target[method]();
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};
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} else {
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return () => {
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method(target);
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};
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}
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}
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// TODO: make async
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function _parse(value, context: ActivationContext, path: string) {
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if (isPrimitive(value))
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return value;
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if (isDescriptor(value))
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return context.activate(value, path);
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if (value instanceof Array)
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return value.map((x, i) => this._parse(x, context, `${path}[${i}]`));
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const t = {};
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for (const p of Object.keys(value))
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t[p] = this._parse(value[p], context, `${path}.${p}`);
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return t;
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}
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export interface ServiceDescriptorParams {
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activation?: ActivationType;
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owner: Container;
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type?: Constructor;
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factory?: Factory;
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params?;
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inject?: object[];
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services?: ServiceMap;
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cleanup?: ((x) => void) | string;
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}
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export class ServiceDescriptor implements Descriptor {
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_instance;
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_hasInstance = false;
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_activationType = ActivationType.Call;
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_services: ServiceMap;
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_type: Constructor = null;
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_factory: Factory = null;
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_params;
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_inject: object[];
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_cleanup: ((x) => void) | string;
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_cacheId: any;
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_owner: Container;
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constructor(opts: ServiceDescriptorParams) {
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argumentNotNull(opts, "opts");
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argumentNotNull(opts.owner, "owner");
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this._owner = opts.owner;
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if (!(opts.type || opts.factory))
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throw new Error(
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"Either a type or a factory must be specified");
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if (opts.activation)
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this._activationType = opts.activation;
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if (opts.type)
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this._type = opts.type;
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if (opts.params)
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this._params = opts.params;
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if (opts.inject)
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this._inject = opts.inject;
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if (opts.services)
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this._services = opts.services;
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if (opts.factory)
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this._factory = opts.factory;
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if (opts.cleanup) {
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if (!(typeof (opts.cleanup) === "string" || opts.cleanup instanceof Function))
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throw new Error(
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"The cleanup parameter must be either a function or a function name");
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this._cleanup = opts.cleanup;
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}
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if (this._activationType === ActivationType.Singleton) {
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const tof = this._type || this._factory;
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// create the persistent cache identifier for the type
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if (isPrimitive(tof))
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this._cacheId = tof;
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else
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this._cacheId = oid(tof);
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} else {
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this._cacheId = ++cacheId;
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}
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}
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activate(context: ActivationContext) {
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// if we have a local service records, register them first
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let instance;
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switch (this._activationType) {
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case ActivationType.Singleton: // SINGLETON
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// if the value is cached return it
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if (this._hasInstance)
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return this._instance;
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// singletons are bound to the root container
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const container = context.container.getRootContainer();
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if (container.has(this._cacheId)) {
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instance = container.get(this._cacheId);
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} else {
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instance = this._create(context);
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container.store(this._cacheId, instance);
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if (this._cleanup)
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container.onDispose(
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makeClenupCallback(instance, this._cleanup));
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}
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this._hasInstance = true;
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return (this._instance = instance);
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case ActivationType.Container: // CONTAINER
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// return a cached value
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if (this._hasInstance)
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return this._instance;
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// create an instance
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instance = this._create(context);
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// the instance is bound to the container
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if (this._cleanup)
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this._owner.onDispose(
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makeClenupCallback(instance, this._cleanup));
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// cache and return the instance
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this._hasInstance = true;
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return (this._instance = instance);
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case ActivationType.Context: // CONTEXT
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// return a cached value if one exists
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if (context.has(this._cacheId))
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return context.get(this._cacheId);
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// context context activated instances are controlled by callers
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return context.store(this._cacheId, this._create(context));
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case ActivationType.Call: // CALL
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// per-call created instances are controlled by callers
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return this._create(context);
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case ActivationType.Hierarchy: // HIERARCHY
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// hierarchy activated instances are behave much like container activated
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// except they are created and bound to the child container
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// return a cached value
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if (context.container.has(this._cacheId))
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return context.container.get(this._cacheId);
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instance = this._create(context);
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if (this._cleanup)
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context.container.onDispose(makeClenupCallback(
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instance,
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this._cleanup));
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return context.container.store(this._cacheId, instance);
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default:
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throw new Error("Invalid activation type: " + this._activationType);
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}
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}
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isInstanceCreated() {
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return this._hasInstance;
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}
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getInstance() {
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return this._instance;
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}
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_create(context: ActivationContext) {
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trace.debug(`constructing ${context._name}`);
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if (this._activationType !== ActivationType.Call &&
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context.visit(this._cacheId) > 0)
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throw new Error("Recursion detected");
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if (this._services) {
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for (const p in this._services)
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context.register(p, this._services[p]);
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}
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let instance;
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if (!this._factory) {
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const ctor = this._type;
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if (this._params && this._params.length) {
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this._factory = (...args) => {
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const t = Object.create(ctor.prototype);
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const inst = ctor.apply(t, args);
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return isPrimitive(inst) ? t : inst;
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};
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} else {
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this._factory = () => {
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return new ctor();
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};
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}
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}
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if (this._params === undefined) {
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instance = this._factory();
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} else if (this._params instanceof Array) {
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instance = this._factory.apply(this, _parse(this._params, context, "args"));
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} else {
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instance = this._factory(_parse(this._params, context, "args"));
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}
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if (this._inject) {
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this._inject.forEach(spec => {
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for (const m in spec)
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injectMethod(instance, m, context, spec[m]);
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});
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}
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return instance;
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}
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// @constructor {singleton} foo/bar/Baz
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|
|
// @factory {singleton}
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|
|
toString() {
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|
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const parts = [];
|
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parts.push(this._type ? "@constructor" : "@factory");
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parts.push(ActivationType[this._activationType]);
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if (typeof (this._type) === "string")
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parts.push(this._type);
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return parts.join(" ");
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}
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}
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