Feature: Memory

docs/memory/README.md

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+# 储存
+
+Memory
+
+## 需求：
+
+用一套接口，像数据库一样高效读写数据
+
+## 设计：
+
+每个集合储存特定类型。  
+每个类型有自己的储存
+方便地获取/管理每个储存的数据库
+可以进行index来进行方便的查询
+例如：
+```ts
+@Data
+class SomeData {
+    @Index
+    index: number;
+
+    value: string;
+}
+
+@CollectionFor(SomeData)
+class DataCollection extends Collection<SomeData> {
+
+}
+
+dataCollection = Container.get(DataCollection);list((v) => v.index === 0);
+dataCollection.list({index: 1});
+dataCollection.list((v) => v.index === 1);
+```
+

src/memory/DataService.ts

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+export abstract class DataService {
+    /**
+     * create a collection with given name and type
+     * @param name name of the collection
+     * @throws Error if the collection cannot be created
+     */
+    abstract createCollection(name: string): void;
+
+    /**
+     * gets a collection with given name and type.
+     * @param name name of the collection
+     * @return the collection
+     * @throws Error if the collection does not exist
+     */
+    abstract getCollection<T>(name: string): Collection<T>;
+
+    abstract exists(name: string): boolean;
+}
+
+export abstract class Collection<T> {
+    /**
+     * get name of the collection
+     * @return name of collection
+     */
+    abstract getName(): string;
+
+    /**
+     * rename the collection
+     * @param name new name for the collection
+     * @throws Error if the collection name already exists
+     */
+    abstract renameCollection(name: string): void;
+
+    abstract count(condition?: Predicate<T>): number;
+
+    abstract createIndex(...key: (keyof T)[]): void;
+
+    abstract dropIndex(...key: (keyof T)[]): void;
+
+    abstract list(condition?: Predicate<T>): T[];
+
+    abstract delete(condition?: Predicate<T>): void;
+
+    abstract update(condition: Predicate<T>, replacement: UnaryOperator<T>): void;
+}

src/memory/Decorator.ts

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+
+export const Data = function<T extends Constructor>(target: T): void {
+    const className = target.name;
+
+};

test/unit/memory/DataService.test.ts

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+import {assert} from "chai";
+import { DataService } from "../../../src/memory/DataService";
+import { Container } from "typescript-ioc";
+
+describe("data service", function() {
+    it("should create a collection", function() {
+        const dataService = Container.get(DataService);
+        const collectionName = "test";
+        dataService.createCollection(collectionName);
+        assert(dataService.exists(collectionName));
+        assert.exists(dataService.getCollection(collectionName));
+    });
+});