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feat(ElementInjector): throw when encounter a cyclic dependency

This commit is contained in:
vsavkin 2014-10-27 13:02:46 -04:00
parent b0c9d05ea7
commit 9bd65abb32
5 changed files with 70 additions and 31 deletions
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63
modules/core/src/compiler/element_injector.js
View File

@ -1,11 +1,14 @@
import {FIELD, isPresent, isBlank, Type, int} from 'facade/lang';
import {Math} from 'facade/math';
import {List, ListWrapper} from 'facade/collection';
import {Injector, Key, Dependency, bind, Binding, NoProviderError, ProviderError} from 'di/di';
import {Injector, Key, Dependency, bind, Binding, NoProviderError, ProviderError, CyclicDependencyError} from 'di/di';
import {Parent, Ancestor} from 'core/annotations/visibility';
import {StaticKeys} from './static_keys';
var _MAX_DIRECTIVE_CONSTRUCTION_COUNTER = 10;
var MAX_DEPTH = Math.pow(2, 30) - 1;
var _undefined = new Object();
class TreeNode {
@ -284,6 +287,7 @@ export class ElementInjector extends TreeNode {
this._obj7 = null;
this._obj8 = null;
this._obj9 = null;
this._constructionCounter = 0;
}
clearDirectives() {
@ -298,22 +302,23 @@ export class ElementInjector extends TreeNode {
this._obj7 = null;
this._obj8 = null;
this._obj9 = null;
this._constructionCounter = 0;
}
instantiateDirectives(appInjector:Injector) {
this._appInjector = appInjector;
var p = this._proto;
if (isPresent(p._keyId0)) this._obj0 = this._new(p._binding0);
if (isPresent(p._keyId1)) this._obj1 = this._new(p._binding1);
if (isPresent(p._keyId2)) this._obj2 = this._new(p._binding2);
if (isPresent(p._keyId3)) this._obj3 = this._new(p._binding3);
if (isPresent(p._keyId4)) this._obj4 = this._new(p._binding4);
if (isPresent(p._keyId5)) this._obj5 = this._new(p._binding5);
if (isPresent(p._keyId6)) this._obj6 = this._new(p._binding6);
if (isPresent(p._keyId7)) this._obj7 = this._new(p._binding7);
if (isPresent(p._keyId8)) this._obj8 = this._new(p._binding8);
if (isPresent(p._keyId9)) this._obj9 = this._new(p._binding9);
if (isPresent(p._keyId0)) this._getDirectiveByKeyId(p._keyId0);
if (isPresent(p._keyId1)) this._getDirectiveByKeyId(p._keyId1);
if (isPresent(p._keyId2)) this._getDirectiveByKeyId(p._keyId2);;
if (isPresent(p._keyId3)) this._getDirectiveByKeyId(p._keyId3);;
if (isPresent(p._keyId4)) this._getDirectiveByKeyId(p._keyId4);;
if (isPresent(p._keyId5)) this._getDirectiveByKeyId(p._keyId5);;
if (isPresent(p._keyId6)) this._getDirectiveByKeyId(p._keyId6);;
if (isPresent(p._keyId7)) this._getDirectiveByKeyId(p._keyId7);;
if (isPresent(p._keyId8)) this._getDirectiveByKeyId(p._keyId8);;
if (isPresent(p._keyId9)) this._getDirectiveByKeyId(p._keyId9);;
}
get(token) {
@ -321,6 +326,10 @@ export class ElementInjector extends TreeNode {
}
_new(binding:Binding) {
if (this._constructionCounter++ > _MAX_DIRECTIVE_CONSTRUCTION_COUNTER) {
throw new CyclicDependencyError(binding.key);
}
var factory = binding.factory;
var deps = binding.dependencies;
var length = deps.length;
@ -365,7 +374,6 @@ export class ElementInjector extends TreeNode {
return this._getByKey(dep.key, dep.depth);
}
/*
* It is fairly easy to annotate keys with metadata.
* For example, key.metadata = 'directive'.
@ -381,10 +389,10 @@ export class ElementInjector extends TreeNode {
_getByKey(key:Key, depth:int) {
var ei = this;
while (ei != null && depth >= 0) {
var specObj = ei._getSpecialObjectByKey(key);
var specObj = ei._getSpecialObjectByKeyId(key.id);
if (specObj !== _undefined) return specObj;
var dir = ei._getDirectiveByKey(key);
var dir = ei._getDirectiveByKeyId(key.id);
if (dir !== _undefined) return dir;
ei = ei._parent;
@ -393,28 +401,25 @@ export class ElementInjector extends TreeNode {
return this._appInjector.get(key);
}
_getSpecialObjectByKey(key:Key) {
_getSpecialObjectByKeyId(keyId:int) {
var staticKeys = StaticKeys.instance();
var keyId = key.id;
if (keyId === staticKeys.viewId) return this._view;
//TODO add other objects as needed
return _undefined;
}
_getDirectiveByKey(key:Key) {
_getDirectiveByKeyId(keyId:int) {
var p = this._proto;
var keyId = key.id;
if (p._keyId0 === keyId) return this._obj0;
if (p._keyId1 === keyId) return this._obj1;
if (p._keyId2 === keyId) return this._obj2;
if (p._keyId3 === keyId) return this._obj3;
if (p._keyId4 === keyId) return this._obj4;
if (p._keyId5 === keyId) return this._obj5;
if (p._keyId6 === keyId) return this._obj6;
if (p._keyId7 === keyId) return this._obj7;
if (p._keyId8 === keyId) return this._obj8;
if (p._keyId9 === keyId) return this._obj9;
if (p._keyId0 === keyId) {if (isBlank(this._obj0)){this._obj0 = this._new(p._binding0);} return this._obj0;}
if (p._keyId1 === keyId) {if (isBlank(this._obj1)){this._obj1 = this._new(p._binding1);} return this._obj1;}
if (p._keyId2 === keyId) {if (isBlank(this._obj2)){this._obj2 = this._new(p._binding2);} return this._obj2;}
if (p._keyId3 === keyId) {if (isBlank(this._obj3)){this._obj3 = this._new(p._binding3);} return this._obj3;}
if (p._keyId4 === keyId) {if (isBlank(this._obj4)){this._obj4 = this._new(p._binding4);} return this._obj4;}
if (p._keyId5 === keyId) {if (isBlank(this._obj5)){this._obj5 = this._new(p._binding5);} return this._obj5;}
if (p._keyId6 === keyId) {if (isBlank(this._obj6)){this._obj6 = this._new(p._binding6);} return this._obj6;}
if (p._keyId7 === keyId) {if (isBlank(this._obj7)){this._obj7 = this._new(p._binding7);} return this._obj7;}
if (p._keyId8 === keyId) {if (isBlank(this._obj8)){this._obj8 = this._new(p._binding8);} return this._obj8;}
if (p._keyId9 === keyId) {if (isBlank(this._obj9)){this._obj9 = this._new(p._binding9);} return this._obj9;}
return _undefined;
}

18
modules/core/test/compiler/element_injector_spec.js
View File

@ -40,6 +40,14 @@ class NeedsService {
}
}
class A_Needs_B {
constructor(dep){}
}
class B_Needs_A {
constructor(dep){}
}
class NeedsView {
@FIELD("view:Object")
constructor(@Inject(View) view) {
@ -215,6 +223,16 @@ export function main() {
expect(inj.get(View)).toEqual(view);
});
it("should handle cyclic dependencies", function () {
expect(() => {
injector([
bind(A_Needs_B).toFactory((a) => new A_Needs_B(a), [B_Needs_A]),
bind(B_Needs_A).toFactory((a) => new B_Needs_A(a), [A_Needs_B])
]);
}).toThrowError('Cannot instantiate cyclic dependency! ' +
'(A_Needs_B -> B_Needs_A -> A_Needs_B)');
});
});
});
}

15
modules/di/src/exceptions.js
View File

@ -2,9 +2,22 @@ import {ListWrapper, List} from 'facade/collection';
import {stringify} from 'facade/lang';
import {Key} from './key';
function findFirstClosedCycle(keys:List) {
var res = [];
for(var i = 0; i < keys.length; ++i) {
if (ListWrapper.contains(res, keys[i])) {
ListWrapper.push(res, keys[i]);
return res;
} else {
ListWrapper.push(res, keys[i]);
}
}
return res;
}
function constructResolvingPath(keys:List) {
if (keys.length > 1) {
var reversed = ListWrapper.reversed(keys);
var reversed = findFirstClosedCycle(ListWrapper.reversed(keys));
var tokenStrs = ListWrapper.map(reversed, (k) => stringify(k.token));
return " (" + tokenStrs.join(' -> ') + ")";
} else {

2
modules/facade/src/collection.dart
View File

@ -31,7 +31,7 @@ class ListWrapper {
static List createFixedSize(int size) => new List(size);
static get(m, k) => m[k];
static void set(m, k, v) { m[k] = v; }
static contains(m, k) => m.containsKey(k);
static contains(List m, k) => m.contains(k);
static map(list, fn) => list.map(fn).toList();
static filter(List list, fn) => list.where(fn).toList();
static find(List list, fn) => list.firstWhere(fn, orElse:() => null);

3
modules/facade/src/collection.es6
View File

@ -69,6 +69,9 @@ export class ListWrapper {
}
return false;
}
static contains(list:List, el) {
return list.indexOf(el) !== -1;
}
static reversed(array) {
var a = ListWrapper.clone(array);
return a.reverse();