And the fourth is the poller and exacter of fees;

第四种就是收取与敲诈费用者；

Listing 6.3 File poller configuration which sends the message to the mail service.

清单6.3文件轮询器配置：向邮件服务发送消息。

The poller daemon, pollerd, will regularly poll detected services to ensure they are operational.

轮询器守护程序pollerd将定期轮询已检测到的服务以确保它们是可操作的。

The first stanza of actual configuration is the poller element, which is the default poller for the document.

实质配置的第一段是poller元素，它是文档的默认轮询器。

The first thing which we’ve done in every example so far is configure a simple file poller on the file system.

到目前为止，我们在每个示例中所做的第一件事就是配置一个轮询文件系统的简单文件轮询器。

To do this, we will create a plugin for the capability daemon (capsd) and a monitor for the poller daemon (pollerd).

要做到这一点，将创建用于功能守护程序(capsd)的插件和用于轮询器守护程序(pollerd)的监控程序。

We configure one as a default poller for the entire Spring Integration configuration because it's easier than repeating it.

出于简单，我们为整个Spring Integration配置一个默认的轮询器。

The poller element is defined just once so that everything that needs a poller in the context can make use of a default one.

poller元素只定义了一次，这样，上下文中需要轮询器的所有内容都可以利用这个缺省的轮询器了。

In the file poller implementation we just read a file from the file system and send the received file to the Mail service endpoint.

在这个文件轮询器配置中，我们仅仅从文件系统读取文件，然后把收到的文件发送给邮件服务端点。

A poller is exactly what it sounds like: it's the mechanism that polls different endpoints for changes and, if some thing's perceived to have changed, let's the adapter react to it as an event.

确切来说，轮询器是一种机制，在有变化时轮询不同端点，并在感知到某些内容发生变化后让适配器对其做出响应，就像一个事件。