node使用redis緩存

最近想知道node相關的緩存，就找到了redis

然後自己實現了node api數據的緩存

我先寫了個模塊，當做redis的鏈接對象的工廠

新建了redis_factory.js

var redis = require('redis');
var poolModule = require('generic-pool');//使用generic-pool池化
var pool = poolModule.Pool({
    name     : 'redisPool',
    create   : function(callback) {
        var client = redis.createClient();
        callback(null, client);
    },
    destroy  : function(client) {
        client.quit();
    },
    max      : 100,
    min      : 5,
    idleTimeoutMillis : 30000,
    log      : false
});

exports.pool = pool;

然後在api方法裏面這樣用

#include <iostream>
#include"stack.h"
#include"stack.cpp"
using namespace std;

int main()
{
    Stack<double> stack;
    stack.push(5);
    stack.push(54.01);
    stack.push(55);
    stack.push(577);
    stack.printStack();
    cout<<stack.contains(54)<<endl;
    cout<<stack.contains(555)<<endl;


    return 0;
}

var pool = require('../common/redis_factory').pool;
var ItemModel = require('../Dao/item')();
app.get('/getData',function(req, res) {
        var type = req.query.type;
        var city = req.query.city;
        var id = type + city;//根據參數生成id
        pool.acquire(function (err, client) {//pool.acquire獲取數據庫連接
            client.GET(id, function (err,result) {//在redis裏面看看id對應的值有沒存在
               if(result!=null){
                   pool.release(client);//釋放數據庫連接
                   res.end(result);//存在，返回數據
               }else{
                       ItemModel.findByType(type,city,function(err,data){//不存在，去mongodb裏面查詢
                           if(!err) {
                               var ret =JSON.stringify(data);//如果不出錯，把返回的json轉化爲字符串
                               pool.acquire(function (err, client) {
                                   client.SET(id,ret,function (err,result) {//把字符串存到redis裏面
                                       pool.release(client);//釋放數據庫連接
                                   });
                               });
                               res.end(ret);//返回查詢到的數據
                           }
                           else{
                               res.end(err);
                           }
                       });
                   
                }
             }
        });
});