如何定义OSGi包开始级别？ [英] How is the OSGi bundle start level defined?

问题描述

如何定义OSGi包的启动级别？

How is the OSGi bundle start level defined?

我正在使用Apache felix，并希望在框架执行中保持启动级别。我预计不需要在Manifest.MF的所有条目中非常频繁地更改捆绑的起始级别.MF似乎是最明智的。我去了org.osgi.framework.startlevel，但还没有看到一个实际的例子。

I am using Apache felix and would like to persist the start level across framework executions. I do not anticipate a need to change the start level of a bundle very frequently at all an an entry in Manifest.MF seems the most sensible. I've to org.osgi.framework.startlevel but have not seen a practical example.

我还在maven-bundle-plugin中使用maven，如果有一种优雅的方式将POM中的起始级别合并到一起就很棒。

I am also using maven with the maven-bundle-plugin, if there is an elegant way to incorporate the start level in the POM that would be brilliant.

推荐答案

捆绑包在构建时没有定义自己的启动级别;将安装捆绑包的管理员或代理定义到框架中。

Bundles don't define their own start level at build-time; the administrator or agent that installs the bundle into the framework defines it.

核心框架定义开始等级引用：

Start Level API提供以下功能：

The Start Level API provides the following functions:

• 控制OSGi框架的起始启动级别。

• Controls the beginning start level of the OSGi Framework.

用于修改活动启动级别框架。

Is used to modify the active start level of the Framework.

可用于为捆绑包指定特定的起始等级。

Can be used to assign a specific start level to a bundle.

可以为新安装的软件包设置初始启动级别。

Can set the initial start level for newly installed bundles.

最后一个两个与您的询问相关。第8.3.4节— 更改捆绑包的起始级别—表示框架将持久存储指定的起始级别。

The last two are relevant to your inquiry here. Section 8.3.4—Changing a Bundle's Start Level—indicates that the framework will store an assigned start level persistently.

如果你是使用Apache Felix，有几种方法可以安装bundle并分配它们的启动级别，无论是显式还是允许它们继承已安装bundle的默认启动级别：

If you're using Apache Felix, there are several ways you can install bundles and assign their start level, whether explicitly or by allowing them to inherit a default start level for installed bundles:

• Felix文件安装（参见 felix.fileinstall.start.level 属性，虽然它不是 per-bundle ）


• Felix Bundle Auto-Deploy （参见< a href =http://felix.apache.org/site/apache-felix-framework-configuration-properties.html#ApacheFelixFrameworkConfigurationProperties-launcher =nofollow noreferr呃> felix.auto.install。< n> 财产）


• GoGo Shell Command （参见 bundlelevel 命令）

• Felix File Install (see the felix.fileinstall.start.level property, though it's not per-bundle)
• Felix Bundle Auto-Deploy (see the felix.auto.install.<n> property)
• GoGo Shell Command (see the bundlelevel command)

另外，请参阅 felix.startlevel.bundle property ，它控制通过上述方式以外的方式安装的软件包。

Also, see the felix.startlevel.bundle property, which controls bundles installed through means other than those above.

至于设置一个清单属性（例如在构建时使用Maven），以前有一种方法可以在Equinox中执行此操作—现在已弃用—但是没有标准的方法可以让bundle向框架指示什么它应该是适当的起始水平。

As for setting a manifest property (such as with Maven at build time), there used to be a way to do this in Equinox—now deprecated—but there is no standard means for a bundle to indicate to the framework what its proper start level should be.

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