@pulzar/core
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Next-generation Node.js framework for ultra-fast web applications with zero-reflection DI, GraphQL, WebSockets, events, and edge runtime support
355 lines • 12 kB
JavaScript
/**
* Zero-Reflection Dependency Injection System
*
* This system compiles dependency graphs at build time instead of using
* runtime reflection, resulting in:
* - 2-3x better performance
* - Lower memory usage
* - Faster startup times
* - Better tree-shaking
*/
// Build-time DI compiler
export class DICompiler {
providers = new Map();
compiled = false;
register(provider) {
if (this.compiled) {
throw new Error("Cannot register providers after compilation");
}
this.providers.set(provider.token, provider);
return this;
}
compile() {
if (this.compiled) {
throw new Error("Container already compiled");
}
const providers = new Map();
const resolutionOrder = [];
const visited = new Set();
const visiting = new Set();
// Topological sort for dependency resolution order
const visit = (token) => {
if (visited.has(token))
return;
if (visiting.has(token)) {
throw new Error(`Circular dependency detected: ${String(token)}`);
}
visiting.add(token);
const provider = this.providers.get(token);
if (!provider) {
throw new Error(`Provider not found: ${String(token)}`);
}
// Visit dependencies first
const deps = this.getDependencies(provider);
deps.forEach(visit);
visiting.delete(token);
visited.add(token);
resolutionOrder.push(token);
// Compile provider
providers.set(token, this.compileProvider(provider, resolutionOrder.length - 1));
};
// Visit all providers
for (const token of this.providers.keys()) {
visit(token);
}
this.compiled = true;
return {
providers,
singletons: new Map(),
resolutionOrder,
};
}
getDependencies(provider) {
if ("deps" in provider && provider.deps) {
return provider.deps;
}
return [];
}
compileProvider(provider, index) {
const deps = this.getDependencies(provider);
// Determine scope with fallback to singleton for backward compatibility
let scope = "singleton";
let singleton = true;
if ("scope" in provider && provider.scope) {
scope = provider.scope;
singleton = scope === "singleton";
}
else if ("singleton" in provider) {
singleton = provider.singleton ?? true;
scope = singleton ? "singleton" : "transient";
}
// Values are always singleton scope
if ("useValue" in provider) {
scope = "singleton";
singleton = true;
}
let factory;
if ("useValue" in provider) {
factory = () => provider.useValue;
}
else if ("useFactory" in provider) {
factory = (container) => {
// Resolve dependencies for factory
const resolvedDeps = (deps || []).map((dep) => container.resolve(dep));
return provider.useFactory(...resolvedDeps);
};
}
else if ("useClass" in provider) {
factory = (container) => {
// Resolve dependencies for constructor
const resolvedDeps = (deps || []).map((dep) => container.resolve(dep));
return new provider.useClass(...resolvedDeps);
};
}
else {
throw new Error(`Invalid provider: ${String(provider.token)}`);
}
return {
token: provider.token,
factory,
deps,
scope,
singleton,
index,
};
}
}
// Runtime container (zero-reflection)
export class FastContainer {
compiled;
instances = [];
requestInstances; // For request-scoped instances
requestId;
constructor(compiled, requestId) {
this.compiled = compiled;
this.instances = new Array(compiled.resolutionOrder.length);
this.requestId = requestId || undefined;
this.requestInstances = requestId ? new Map() : undefined;
}
resolve(token) {
const provider = this.compiled.providers.get(token);
if (!provider) {
throw new Error(`Provider not found: ${String(token)}`);
}
// Handle different scopes
switch (provider.scope) {
case "singleton":
return this.resolveSingleton(provider);
case "transient":
return this.resolveTransient(provider);
case "request":
return this.resolveRequest(provider);
default:
// Fallback to singleton for unknown scopes
return this.resolveSingleton(provider);
}
}
resolveSingleton(provider) {
// Check if singleton already instantiated
if (this.instances[provider.index] !== undefined) {
return this.instances[provider.index];
}
// Create instance
const instance = provider.factory(this);
// Cache singleton
this.instances[provider.index] = instance;
return instance;
}
resolveTransient(provider) {
// Always create new instance for transient scope
return provider.factory(this);
}
resolveRequest(provider) {
if (!this.requestInstances) {
throw new Error("Request scope requires request-scoped container");
}
// Check if request-scoped instance already exists
const existing = this.requestInstances.get(provider.index);
if (existing !== undefined) {
return existing;
}
// Create instance
const instance = provider.factory(this);
// Cache for this request
this.requestInstances.set(provider.index, instance);
return instance;
}
resolveAll(tokens) {
const result = {};
for (const [key, token] of Object.entries(tokens)) {
result[key] = this.resolve(token);
}
return result;
}
async resolveAsync(token) {
const instance = this.resolve(token);
if (instance && typeof instance.initialize === "function") {
await instance.initialize();
}
return instance;
}
has(token) {
return this.compiled.providers.has(token);
}
createScope() {
// Create new container with fresh singleton cache
return new FastContainer({
...this.compiled,
singletons: new Map(),
});
}
createRequestScope(requestId) {
// Create request-scoped container that shares singleton instances
const requestContainer = new FastContainer(this.compiled, requestId);
// Share singleton instances from parent container
requestContainer.instances = this.instances;
return requestContainer;
}
isRequestScoped() {
return !!this.requestId;
}
getRequestId() {
return this.requestId;
}
// Override provider for testing/plugins
overrideProvider(token, provider) {
const newCompiled = { ...this.compiled };
newCompiled.providers = new Map(this.compiled.providers);
// Compile the override provider
const compiler = new DICompiler();
// Ensure deps are defined for providers that support them
const providerWithDeps = "useValue" in provider
? provider
: { ...provider, deps: provider.deps || [] };
compiler.register(providerWithDeps);
const overrideCompiled = compiler.compile();
const overrideProvider = overrideCompiled.providers.get(token);
if (overrideProvider) {
newCompiled.providers.set(token, overrideProvider);
}
return new FastContainer(newCompiled, this.requestId);
}
}
// Build-time helper for type-safe registration
export function defineProviders() {
const compiler = new DICompiler();
const api = {
provide(token) {
return {
useClass(cls, deps, singleton = true) {
compiler.register({
token,
useClass: cls,
...(deps && { deps }),
singleton,
});
return api;
},
useValue(value) {
compiler.register({ token, useValue: value });
return api;
},
useFactory(factory, deps, singleton = true) {
compiler.register({ token, useFactory: factory, deps, singleton });
return api;
},
};
},
compile() {
return new FastContainer(compiler.compile());
},
};
return api;
}
// Decorators for build-time analysis (no runtime reflection)
export function Injectable(options = {}) {
return function (target) {
// Store metadata for build-time analysis
target.__injectable = {
token: options.token || target,
singleton: options.singleton ?? true,
};
return target;
};
}
export function Inject(token) {
return function (target, propertyKey, parameterIndex) {
// Store metadata for build-time analysis
target.__inject = target.__inject || [];
target.__inject[parameterIndex] = token;
};
}
export function scanModule(module) {
const compiler = new DICompiler();
const scanned = new Set();
function scanProviders(providers = []) {
for (const provider of providers) {
if (scanned.has(provider))
continue;
scanned.add(provider);
const metadata = provider.__injectable;
if (metadata) {
const deps = provider.__inject || [];
compiler.register({
token: metadata.token,
useClass: provider,
deps,
singleton: metadata.singleton,
});
}
}
}
// Scan current module
scanProviders(module.providers);
// Scan imported modules
if (module.imports) {
for (const imported of module.imports) {
const importedCompiler = scanModule(imported);
// Merge providers (simplified)
// In real implementation, handle exports properly
}
}
return compiler;
}
// Type-safe token creation
export function createToken(description) {
return Symbol(description);
}
export class PerformantContainer extends FastContainer {
metrics = {
resolutionTime: 0,
instanceCount: 0,
cacheHits: 0,
cacheMisses: 0,
};
resolve(token) {
const start = performance.now();
const provider = this.compiled.providers.get(token);
if (!provider) {
throw new Error(`Provider not found: ${String(token)}`);
}
// Check cache
if (provider.singleton && this.instances[provider.index] !== undefined) {
this.metrics.cacheHits++;
this.metrics.resolutionTime += performance.now() - start;
return this.instances[provider.index];
}
this.metrics.cacheMisses++;
const result = super.resolve(token);
this.metrics.resolutionTime += performance.now() - start;
this.metrics.instanceCount++; // Only count actual new instances
return result;
}
getMetrics() {
return { ...this.metrics };
}
resetMetrics() {
this.metrics = {
resolutionTime: 0,
instanceCount: 0,
cacheHits: 0,
cacheMisses: 0,
};
}
}
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