If at any time you do not understand what I say, always ask for an explanation.

Whenever the wind blew, the tree rocked, naturally enough.

无论什么时候只要刮风, 那棵树就自然而然地摇晃起来.

Now it is time to use Redis in our application code.

现在是时候在应用程序代码中使用Redis了。

To run the application locally, you can download and install a local Redis server from the Redis website.

要在本地运行应用程序，可从Redis网站下载并安装一个本地Redis服务器。

Details such as these are provided to us by the Redis instance we created in the previous section.

这些细节是我们在上一节中创建的Redis实例提供给我们的。

In addition, there is a Redis library for Node. js, which we can use to communicate with our Redis Cloud service.

此外，还有一个针对Node.js的Redis库，我们可使用它与我们的Redis Cloud服务通信。

In addition, we have a services property with the name of our instance of the Redis service.

此外，我们还有一个services属性，其内容为我们的Redis服务的实例的名称。

If that command completed successfully, you have an instance of Redis ready to use.

如果该命令成功完成，您就会有一个Redis实例可供使用。

Within the object returned to us is a credentials property, which contains the host, port, and password we need to connect to the Redis service.

返回给我们的对象中是一个credentials属性，它包含我们连接到Redis服务所需的主机、端口和密码。

APC and Wincache aren't the only choices for a user cache; memcache and Redis are other popular choices that don't require you to run the user cache on the same server as the Web server.

memcache和Redis是不需要您在与Web服务器相同的服务器上运行用户缓存的其他流行选择。

In our new implementation, we are no longer looping through the clients array and sending the chat message ( this is now being done in the Redis subscriber event handler).

在我们的新实现中，我们不再对客户端数组执行循环并发送聊天消息（此工作现在在Redis订阅者事件处理函数中三成。）

A simpler solution is Redis, which supports basic publish/ subscribe.

Redis是一个更简单的解决方案，它支持基本发布/订阅功能。

You can see the create-service command takes three parameters: the service name, the plan, and a name for the specific instance of the Redis Cloud service you choose.

可以看到create-service命令接受3个参数：服务名称、计划和您选择的Redis Cloud服务的特定实例的名称。

The Redis is a persistent and distributed server-side-caching-system which supports the multiple data structures.

Redis是一个支持多种数据结构的、持久化的、分布式的服务器端缓存系统。

Before we continue, we need details like the host, port, and password in order to connect to the Redis server given to us by Redis Cloud.

继续之前，我们需要一些细节，比如主机、端口和密码，才能连接到Redis Cloud为我们提供的Redis服务器。

We just need to know some additional details about the Redis Cloud service.

我们只需知道其他一些有关Redis Cloud服务的细节。

Run the following command to get a Redis instance.

运行以下命令来获得一个Redis实例。

If it is undefined, we assume the user has a Redis server running locally at the default port ( 6379).

如果它未定义，我们假设用户有一个通过默认端口（6379）z在本地运行的Redis服务器。

We need to add the Redis library to our dependencies.

我们需要将Redis库添加到我们的依赖关系中。

We need to require the Redis library so we can use it in our server code.

我们需要对Redis库执行require，所以我们可在服务器代码中使用它。

Redis is an extremely fast key-value store.

Redis是一个非常快的键-值存储。