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258 lines (206 loc) · 6.83 KB
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import {Map, List, MapWrapper, ListWrapper} from 'angular2/src/facade/collection';
import {Binding, BindingBuilder, bind} from './binding';
import {ProviderError, NoProviderError, InvalidBindingError,
AsyncBindingError, CyclicDependencyError, InstantiationError} from './exceptions';
import {FunctionWrapper, Type, isPresent, isBlank} from 'angular2/src/facade/lang';
import {Promise, PromiseWrapper} from 'angular2/src/facade/async';
import {Key} from './key';
var _constructing = new Object();
class _Waiting {
promise:Promise;
constructor(promise:Promise) {
this.promise = promise;
}
}
function _isWaiting(obj):boolean {
return obj instanceof _Waiting;
}
export class Injector {
_bindings:List;
_instances:List;
_parent:Injector;
_defaultBindings:boolean;
_asyncStrategy: _AsyncInjectorStrategy;
_syncStrategy:_SyncInjectorStrategy;
constructor(bindings:List, {parent=null, defaultBindings=false}={}) {
var flatten = _flattenBindings(bindings, MapWrapper.create());
this._bindings = this._createListOfBindings(flatten);
this._instances = this._createInstances();
this._parent = parent;
this._defaultBindings = defaultBindings;
this._asyncStrategy = new _AsyncInjectorStrategy(this);
this._syncStrategy = new _SyncInjectorStrategy(this);
}
get(token) {
return this._getByKey(Key.get(token), false, false);
}
asyncGet(token) {
return this._getByKey(Key.get(token), true, false);
}
createChild(bindings:List):Injector {
return new Injector(bindings, {parent: this});
}
_createListOfBindings(flattenBindings):List {
var bindings = ListWrapper.createFixedSize(Key.numberOfKeys + 1);
MapWrapper.forEach(flattenBindings, (v, keyId) => bindings[keyId] = v);
return bindings;
}
_createInstances():List {
return ListWrapper.createFixedSize(Key.numberOfKeys + 1);
}
_getByKey(key:Key, returnPromise:boolean, returnLazy:boolean) {
if (returnLazy) {
return () => this._getByKey(key, returnPromise, false);
}
var strategy = returnPromise ? this._asyncStrategy : this._syncStrategy;
var instance = strategy.readFromCache(key);
if (isPresent(instance)) return instance;
instance = strategy.instantiate(key);
if (isPresent(instance)) return instance;
if (isPresent(this._parent)) {
return this._parent._getByKey(key, returnPromise, returnLazy);
}
throw new NoProviderError(key);
}
_resolveDependencies(key:Key, binding:Binding, forceAsync:boolean):List {
try {
var getDependency = d => this._getByKey(d.key, forceAsync || d.asPromise, d.lazy);
return ListWrapper.map(binding.dependencies, getDependency);
} catch (e) {
this._clear(key);
if (e instanceof ProviderError) e.addKey(key);
throw e;
}
}
_getInstance(key:Key) {
if (this._instances.length <= key.id) return null;
return ListWrapper.get(this._instances, key.id);
}
_setInstance(key:Key, obj) {
ListWrapper.set(this._instances, key.id, obj);
}
_getBinding(key:Key) {
var binding = this._bindings.length <= key.id ?
null :
ListWrapper.get(this._bindings, key.id);
if (isBlank(binding) && this._defaultBindings) {
return bind(key.token).toClass(key.token);
} else {
return binding;
}
}
_markAsConstructing(key:Key) {
this._setInstance(key, _constructing);
}
_clear(key:Key) {
this._setInstance(key, null);
}
}
class _SyncInjectorStrategy {
injector:Injector;
constructor(injector:Injector) {
this.injector = injector;
}
readFromCache(key:Key) {
if (key.token === Injector) {
return this.injector;
}
var instance = this.injector._getInstance(key);
if (instance === _constructing) {
throw new CyclicDependencyError(key);
} else if (isPresent(instance) && !_isWaiting(instance)) {
return instance;
} else {
return null;
}
}
instantiate(key:Key) {
var binding = this.injector._getBinding(key);
if (isBlank(binding)) return null;
if (binding.providedAsPromise) throw new AsyncBindingError(key);
//add a marker so we can detect cyclic dependencies
this.injector._markAsConstructing(key);
var deps = this.injector._resolveDependencies(key, binding, false);
return this._createInstance(key, binding, deps);
}
_createInstance(key:Key, binding:Binding, deps:List) {
try {
var instance = FunctionWrapper.apply(binding.factory, deps);
this.injector._setInstance(key, instance);
return instance;
} catch (e) {
this.injector._clear(key);
throw new InstantiationError(e, key);
}
}
}
class _AsyncInjectorStrategy {
injector:Injector;
constructor(injector:Injector) {
this.injector = injector;
}
readFromCache(key:Key) {
if (key.token === Injector) {
return PromiseWrapper.resolve(this.injector);
}
var instance = this.injector._getInstance(key);
if (instance === _constructing) {
throw new CyclicDependencyError(key);
} else if (_isWaiting(instance)) {
return instance.promise;
} else if (isPresent(instance)) {
return PromiseWrapper.resolve(instance);
} else {
return null;
}
}
instantiate(key:Key) {
var binding = this.injector._getBinding(key);
if (isBlank(binding)) return null;
//add a marker so we can detect cyclic dependencies
this.injector._markAsConstructing(key);
var deps = this.injector._resolveDependencies(key, binding, true);
var depsPromise = PromiseWrapper.all(deps);
var promise = PromiseWrapper
.then(depsPromise, null, (e) => this._errorHandler(key, e))
.then(deps => this._findOrCreate(key, binding, deps))
.then(instance => this._cacheInstance(key, instance));
this.injector._setInstance(key, new _Waiting(promise));
return promise;
}
_errorHandler(key:Key, e):Promise {
if (e instanceof ProviderError) e.addKey(key);
return PromiseWrapper.reject(e);
}
_findOrCreate(key:Key, binding:Binding, deps:List) {
try {
var instance = this.injector._getInstance(key);
if (!_isWaiting(instance)) return instance;
return FunctionWrapper.apply(binding.factory, deps);
} catch (e) {
this.injector._clear(key);
throw new InstantiationError(e, key);
}
}
_cacheInstance(key, instance) {
this.injector._setInstance(key, instance);
return instance
}
}
function _flattenBindings(bindings:List, res:Map) {
ListWrapper.forEach(bindings, function (b) {
if (b instanceof Binding) {
MapWrapper.set(res, b.key.id, b);
} else if (b instanceof Type) {
var s = bind(b).toClass(b);
MapWrapper.set(res, s.key.id, s);
} else if (b instanceof List) {
_flattenBindings(b, res);
} else if (b instanceof BindingBuilder) {
throw new InvalidBindingError(b.token);
} else {
throw new InvalidBindingError(b);
}
});
return res;
}