如何从Plexus组件获取当前的MavenSession或MavenExecutionRequest [英] How to get the current MavenSession or MavenExecutionRequest from a Plexus Component

问题描述

我创建了一个Plexus组件来容纳要创建的多个Mojo的通用逻辑.我已经能够传递localRepository之类的信息，并从Mojo中传递项目(以及测试用例).

I created a Plexus component to house common logic for several Mojos I want to create. I have been able to pass information like localRepository and project from the Mojo (and test cases).

我想知道是否有一种方法可以从组件内部获取MavenSession或MavenExecutionRequest，而不必从Mojo传递它们作为参数.我知道我的组件将通过Maven Mojo运行.

I was wondering if there is a way to get the MavenSession or MavenExecutionRequest from within the component without having to pass them as parameters from a Mojo. I know my component will be running from a Maven Mojo.

在这种情况下，我正在使用Maven 2.

I'm using Maven 2 in this instance.

推荐答案

我不相信有，我也不认为这是个好主意.

I don't believe there is, nor would I think it's a good idea.

根据我的理解，您要实现的目标是拥有一个类似Commons的组件，该组件将用于多个mojo.这需要在&中传递当前的Maven会话.用于随后传回值.

From my understanding, what you're aiming to achieve is have a commons-like component, that will be used for several mojos. This requires the current Maven session to be passed in & used to subsequently pass back a value.

然而，Maven的工作方式是，它在几乎类似于容器的环境中运行来自插件的目标.每个插件都可以在特定的 Maven阶段内运行，由<executions />定义.这使Maven可以分离构建，测试，检查，部署等的复杂性.除非我没有记错，否则调用mvn clean install是两个单独的执行，一个用于运行clean

The way Maven works however, is that it runs goals from plugins in an almost container-like environment. Each plugin is allowed to act within a particular Maven Phase, as defined by the <executions />. This allows Maven to separate the complexities of building, testing, checking, deploying etc. etc. Calling mvn clean install, unless I'm mistake, is two separate executions, one to run the clean build lifecycle, followed by the install.

因此，假设MavenSession和后续的MavenExecutionRequest代表上一个调用中使用的相同实例是不安全的. clean是一个单独的调用，不应在新的会话中维护其逻辑.

It is therefore not safe to assume that the MavenSession and subsequent MavenExecutionRequest represent the same instance used in a previous call. clean is a separate call, whose logic shouldn't be maintained in a new session.

所以，我的基本意思是，尽管拥有一个通用的神经丛组件是一种好习惯，特别是要在您的mojo上保持一致性，但这是正确的做法(几乎

So, what I'm essentially saying, is that whilst having a common plexus component is a good practice, particularly to maintain consistency across your mojos, it is right practice (almost ioc), to provide the appropriate session each time.

我希望这是您要寻找的答案.相当长，但是要了解为什么需要提供会话，请考虑Maven.

I hope that's the answer you're looking for. Rather long, but to understand why you need to provide the session, think Maven.

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