nodejsrawcache 高速缓存
发布于 10 年前 作者 solqkwgkwg 6256 次浏览 最后一次编辑是 8 年前

nodejsrawcache 高速缓存

作者 : solq

blog :

git : https://github.com/solq360/springnodejs https://github.com/solq360/springnodejsExample.git

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RamCacheService.ts 缓存层服务
Accessor.ts 持久化处理器
Querier.ts 数据查询器
Entity.ts 元数据信息 未完成

以下代码比较旧,在做数据查询器的时候发现 mysql 驱动没有同步的接口,真恶心。为了给自己一个交代还是把功能做出来了 现在把功能共享出来,具体请看 git 源码 http://rawcache.springnodejs.com/

ts 目录 ts 源码 js 目录 ts 编译好的JS代码

Accessor.ts

/**数据持久化处理器*/
interface Accessor {
    /***保存实体*/
    save(name: EntityName, entity: Entity): void;
    /***更新实体*/
    update(name: EntityName, entity: Entity): void;
    /***加载实体*/
    load(name: EntityName, id: any): Entity;
    /***删除实体*/
    remove(name: EntityName, entity: Entity): void;
    /***执行持久化*/
    persister(name: EntityName): void;
}

/**定时 数据持久化处理器*/
class TimerAccessor implements Accessor {
    //数据查询器
    private querier: Querier;
    //持久化监听器
    private persisterListeners: { [id: string]: any };

    //保存队列
    private saveQueue: { [id: string]: { [id: string]: Entity; }; } = {};
    //删除队列
    private removeQueue: { [id: string]: { [id: string]: any; } } = {};

    public save(name: EntityName, entity: Entity): void {
        this.addSaveQueue(name, entity);
    }
    /***更新实体*/
    public update(name: EntityName, entity: Entity): void {
        this.addSaveQueue(name, entity);
    }
    /***加载实体*/
    public load(name: EntityName, id: any): Entity {
        var data: any = this.querier.findOne(name, id);
        return data;
    }
    /***删除实体*/
    public remove(name: EntityName, entity: Entity): void {
        //直接删除
        this.querier.remove(name, entity.getId());
        this.addDelQueue(name, entity);
    }
    /***执行持久化*/
    persister(name: EntityName): void {
        var key: string = name + '';

        /*
        var removeIds: { [id: string]: any; } = this.removeQueue[key];
        this.removeQueue[key] = {};
        for (var id in removeIds) {
            this.querier.remove(name, id);
        }
        removeIds = null;
        */

        var saveIds: { [id: string]: Entity; } = this.saveQueue[key];
        this.saveQueue[key] = {};
        for (var data in saveIds) {
            this.querier.save(name, data);
        }
        saveIds = null;
    }

    /**注册实体持久化监听器*/
    public registerListener(name: EntityName, cacheConfig: CacheConfig): void {
        var key: string = name + '';
        var persisterListener: any = this.persisterListeners[key];
        var $this = this;
        if (persisterListener == null) {
            var value = name;
            persisterListener = setInterval(function() {
                $this.persister(value);
            }, cacheConfig.timeTirgger);
        }
    }
    public removeListener(name: EntityName): void {
        var key: string = name + '';
        var persisterListener: any = this.persisterListeners[key];
        if (persisterListener != null) {
            clearInterval(persisterListener);
            delete this.persisterListeners[key];
        }
    }



    /***构造方法*/
    public static valueOf(querier: Querier): TimerAccessor {
        var result: TimerAccessor = new TimerAccessor();
        result.querier = querier;
        return result;
    }

    //private
    private addSaveQueue(name: EntityName, entity: Entity): void {
        var key: string = name + "";
        var id: string = entity.getId();
        if (this.saveQueue[key] == null) {
            this.saveQueue[key] = {};
        }
        this.saveQueue[key][id] = entity;
    }


    private addDelQueue(name: EntityName, entity: Entity): void {
        var key: string = name + "";
        var id: string = entity.getId();

        if (this.saveQueue[key] == null) {
            return;
        }
        delete this.saveQueue[key][id];
        /*
       
        if (this.removeQueue[key] == null) {
            this.removeQueue[key] = {};
        }
        this.removeQueue[key][id] = 1;
        */
    }
}

Querier .ts 实现未完成

/***查询器*/
interface Querier {
    /**保存数据**/
    save(name: EntityName, entity: Entity): void;
    /**查询指定数据**/
    findOne(name: EntityName, id: any): Entity;
    /**查询所有数据**/
    findAll(name: EntityName): Array<Entity>;
    /**查询指定数据**/
    find(name: EntityName, ...queryParams: Array<any>): Array<Entity>;
    /**删除数据**/
    remove(name: EntityName, id: any): void;
}
/***mysql*/
interface MySqlIConnection {
    query(sql: string, callback: (err: any, rows: any, fields: any) => void): void;
}
class MysqlQuerier implements Querier {
    /**查询SQL模板*/
    private static query_all_tpl: string = "SELECT * FROM {name}";

    /**数据库连接对象*/
    private connection: MySqlIConnection;


    save(name: EntityName, entity: Entity): void {

    }
    findOne(name: EntityName, id: any): any {
        return {};
    }
    findAll(name: EntityName): Array<Entity> {
        var result: Array<Entity> = [];

        var sql: string = MysqlQuerier.query_all_tpl;

        this.connection.query(sql, function(err, rows, fields) {
            if (err) throw err;
            for (var i in rows) {
                
            }
            console.log('value 2', rows);
        });
        return result;
    }
    find(name: EntityName, ...queryParams: Array<any>): Array<Entity> {
        return [];
    }

    remove(name: EntityName, id: any): void {

    }
    
    
    //private
    
    
}

declare var module: any;
module.exports = MysqlQuerier;

RamCacheService.ts

/***
高速缓存服务
不考虑加锁情况下
*/
class RamCacheService {
    //    constructor() {
    //        throw new Error("Cannot new this class");
    //    }
    private entityMetadata: EntityMetadata;
    
    private accessor: Accessor;
    private querier: Querier;
    
    private cacheData: { [id: string]: Entity; } = {};
    private addCacheData(entity: Entity) {
        var id: string = entity.getId();
        this.cacheData[id] = entity;
    }

    private getCacheData(id: any): Entity {
        return this.cacheData[id];
    }

    private removeCacheData(entity: Entity) {
        var id: string = entity.getId();
        delete this.cacheData[id];
    }

    private initCacheData(): void {
        var name = this.entityMetadata.entityName;
        var cacheConfig: CacheConfig = this.entityMetadata.cacheConfig;
        if (cacheConfig.initCacheConfig != null) {
            var initCacheConfig: InitCacheConfig = cacheConfig.initCacheConfig;
            var datas: Array<Entity>;
            switch (initCacheConfig.initType) {
                case InitCacheType.ALL:
                    datas = this.querier.findAll(name);
                    break;
                case InitCacheType.QUERY:
                    datas = this.querier.find(name, initCacheConfig.queryValue);
                    break;
                default:
                    return;
                    break;
            }
            for (var entity in datas) {
                this.addCacheData(entity);
            }
        }

    }

    /**公开方法 */
    /**构造 服务  */
    valueOf(accessor: Accessor, querier: Querier, entityMetadata: EntityMetadata): RamCacheService {
        var result: RamCacheService = new RamCacheService();
        result.accessor = accessor;
        result.querier = querier;
        result.entityMetadata = entityMetadata;
        result.initCacheData();
        return result;
    }
    /**加载或者创建实体 */
    loadOrCreate(id: any, callback: (id: any) => Entity): Entity {
        var resultEntity: Entity = this.getCacheData(id);
        if (resultEntity == null) {
            var name = this.entityMetadata.entityName;
            resultEntity = this.accessor.load(name, id);
        }

        if (resultEntity == null) {
            resultEntity = callback(id);
            this.save(resultEntity);
        }
        return resultEntity;
    }
    /**保存实体 */
    save(entity: Entity): void {
        var name = this.entityMetadata.entityName;
        this.accessor.save(name, entity);
        this.addCacheData(entity);
    }
    /**更新实体 */
    update(entity: Entity): void {
        this.save(entity);
    }
    /**删除实体 */
    remove(entity: Entity): void {
        var name = this.entityMetadata.entityName;
        this.accessor.remove(name, entity);
        this.removeCacheData(entity);
    }
    /**获取实体元数据 */
    getEntityMetadata(): EntityMetadata {
        return this.entityMetadata;
    }
}

declare var module: any;
module.exports = RamCacheService;

TestRamCache.js

var mysql = require('mysql');
var entity = require('./Entity');
var querier = require('./Querier');
var accessor = require('./Accessor');
var ramCacheService = require('./RamCacheService');

var connection = mysql.createConnection({
    host: 'localhost',
    port: 8585,
    database: 'test',
    user: 'root',
    password: '1212'
});
connection.connect();
 
var mysqlQuerier = querier.valueOf(connection);
var timerAccessor = accessor.valueOf(mysqlQuerier);

mysqlQuerier.findAll(EntityName.test, function (res) {
    // console.log(res);
});

_find();

function _find() {
    var startTime = new Date().getTime();
    timerAccessor.load(EntityName.test, 1, function (res) {
        return { id: 1 };
    }, function (res) {
        var endTime = new Date().getTime();
        console.log("find  time : ", (endTime - startTime));
        console.log(res);

        cache_find();
    });
}

function cache_find() {
    var startTime = new Date().getTime();
    timerAccessor.load(EntityName.test, 1, function (res) {
        return { id: 1 };
    }, function (res) {
        var endTime = new Date().getTime();
        console.log("find cache time : ", (endTime - startTime));
        console.log(res);
    });
}

Show Result

find  time :  9
{ id: 1, body: '2121' }
find cache time :  1
{ id: 1, body: '2121' }

至于ts 是什么有兴趣请看

9 回复

马上要完成了,欢迎各位给点意见

TS不错,赞一个

dart也不错,不过都代替不了javascript.

跟as 挺像的……

as已经快不存在了。

@hackerjs,真心话,JS太烂了,虽然很多人在用,但不代表JS好.最垃圾的就数什么转型函数Number(),parseInt这玩意对于’1234str’居然可以转换成1234。。还有太多 。。。对于有其它语言开发经验的人来说,简直不可理喻。

dart,type script正是因为ms和google认识到js的不足。

项目已共享,欢迎给意见

不管你用什么语言将string转换成int,是不是都应该先验证下是否可以转换? 无论是自己写个正则表达式进行判断,还是用jquery插件进行判断,都比直接转换来得合理些。

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