如何使用Apache Camel监视文件更改? [英] How can Apache Camel be used to monitor file changes?

问题描述

我想监视给定目录中的所有文件的更改，即更新的时间戳.对于使用文件组件的Camel来说，这种用例似乎很自然，但是我似乎找不到找到配置此行为的方法.

I would like to monitor all of the files in a given directory for changes, ie an updated timestamp. This use case seems natural for Camel using the file component, but I can't seem to find a way to configure this behavior.

类似的uri:

file:/some/directory

将使用提供的目录中的文件，但将其删除.

will consume the files in the provided directory but will delete them.

类似的uri:

file:/some/directory?noop=true

在添加文件或启动路由时，每个文件都会使用一次.

consumes each file once when it is added or when the route is started.

令人惊讶的是，

consumeOnChange=true

是否有一种直接的方法来监视文件更改并且在使用后不删除文件?

Is there a straightforward way to monitor file changes and not delete the file after consuming?

推荐答案

您可以通过设置idempotentKey来告诉Camel如何将文件视为已更改来进行此操作.例如，如果文件大小更改或时间戳更改等.

You can do this by setting up the idempotentKey to tell Camel how a file is considered changed. For example if the file size changes, or its timestamp changes etc.

在Camel文件文档中查看更多详细信息: https://camel .apache.org/components/latest/file-component.html

See more details at the Camel file documentation at: https://camel.apache.org/components/latest/file-component.html

请参阅避免多次读取同一文件(幂等的使用者).并了解等幂和idempotentKey.

See the section Avoiding reading the same file more than once (idempotent consumer). And read about idempotent and idempotentKey.

类似的东西

from("file:/somedir?noop=true&idempotentKey=${file:name}-${file:size}")

或

from("file:/somedir?noop=true&idempotentKey=${file:name}-${file:modified}")

您可以在此处阅读有关可以使用的各种$ {file:xxx}令牌的信息: http ://camel.apache.org/file-language.html

You can read here about the various ${file:xxx} tokens you can use: http://camel.apache.org/file-language.html

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