Gradle：扩展现有类型的 DLS

Question

我想为现有类型添加一个函数，在我的例子中是NativeLibrarySpec。

我尝试使用gradle extensions，它即将工作，但现在我想概括它以便能够使用它，就像它是NativeLibrarySpec 的 DSL 的标准功能一样。 问题是我只能在它的配置（包含我的函数的块）之后访问实例，所以它失败了，因为它在我能够链接它之前尝试调用specialConfig...

这里是代码（不要在意这个例子是针对本地软件 C++ 的）：

// File: build.gradle
apply plugin: 'cpp'

class SpecialConfig {
    NativeComponentSpec componentSpec

    SpecialConfig(NativeComponentSpec componentSpec) {
        this.componentSpec = componentSpec
    }

    def something(boolean enabled) {
        componentSpec.sources {
            cpp {
                // Some important stuffs
            }
        }
    }
}

model {
    components {
        main(NativeLibrarySpec) {
            // How to bring this out ??
            project.extensions.create('specialConfig', SpecialConfig, it)

            // This is the new functionality I want to use
            specialConfig {
                something(true)
            }
        }
    }
}

这是另一个示例，但它仅适用于项目。* https://dzone.com/articles/gradle-goodness-extending-dsl

Answer 1

你可以试试这个吗

plugins {
    id 'cpp'
}

class SpecialConfig {
    // no need to pass this to the constructor we can just make it a
    // method arg instead
    SpecialConfig() {
    }

    // manipulate spec as desired
    def something(NativeComponentSpec spec, boolean enabled) {
        println "Hello something!"
        spec.sources {
            cpp {
                // Some important stuffs
            }
        }
    }
}

// add your extension earlier
project.extensions.create('specialConfig', SpecialConfig)
model {
    components {
        main(NativeLibrarySpec) { mySpec ->
            // we can call our extension via the project
            project.specialConfig { config ->
                // our closure is handed an instance of the class
                // on that we can call methods
                config.something(mySpec, true)
            }
            // or more simply we could make it a one liner
            project.specialConfig.something(mySpec, true)
        }
    }
}

输出：

$ gradle build
Configuration on demand is an incubating feature.
Hello something!
:linkMainSharedLibrary UP-TO-DATE
:mainSharedLibrary UP-TO-DATE
:createMainStaticLibrary UP-TO-DATE
:mainStaticLibrary UP-TO-DATE
:assemble UP-TO-DATE
:check UP-TO-DATE
:build UP-TO-DATE

BUILD SUCCESSFUL

Total time: 1.104 secs