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  • Gradle Goodness: Add Incremental Build Support to Custom Tasks with Annotations

    In a previous post we learned how we can use the inputs and outputs properties to set properties or files that need to be checked to see if a task is up to date. In this post we learn how a custom task class can use annotations to set input properties, file or files and output files or dir.

    For input we can use @Input, @InputFile, @InputFiles or @InputDirectory annotations. Gradle uses the properties with annotations for checking if a task is up to date. Output file or directory can be marked with @OutputFile and @OutputDirectory.

    00.task generateVersionFile(type: Generate) {
    01.version = '2.0'
    02.outputFile = file("$project.buildDir/version.txt")
    03.}
    04. 
    05.task showContents << {
    06.println generateVersionFile.outputFile.text
    07.}
    08.showContents.dependsOn generateVersionFile
    09. 
    10.class Generate extends DefaultTask {
    11.@Input
    12.String version
    13. 
    14.@OutputFile
    15.File outputFile
    16. 
    17.@TaskAction
    18.void generate() {
    19.def file = getOutputFile()
    20.if (!file.isFile()) {
    21.file.parentFile.mkdirs()
    22.file.createNewFile()
    23.}
    24.file.write "Version: ${getVersion()}"
    25.}
    26.}

    We can run our task and get the following output:

    $ gradle showContents
    :generateVersionFile
    :showContents
    Version: 2.0
     
    BUILD SUCCESSFUL

    And if we run it again we see the task is now up to date:

    $ gradle showContents
    :generateVersionFile UP-TO-DATE
    :showContents
    Version: 2.0
     
    BUILD SUCCESSFUL

    We can change the version numer in our build script to 2.1 and see the output:

    $ gradle showContents
    :generateVersionFile
    :showContents
    Version: 2.1
     
    BUILD SUCCESSFUL
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  • 原文地址:https://www.cnblogs.com/GoAhead/p/4189150.html
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