redis

When a specific cache invalidation is required they use Redis messaging to publish removal notices to the "L1" caches.

当需要让一个特定的缓存失效，会通过Redis消息系统给一级缓存发送删除通知。

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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。

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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。

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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。

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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。

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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。

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Redis is an extremely fast key-value store.

Redis是一个非常快的键-值存储。

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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。

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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。

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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。

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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。

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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。

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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。

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Run the following command to get a Redis instance.

运行以下命令来获得一个Redis实例。

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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。

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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。

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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。

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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。

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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。

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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。）

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