学习建议

学习路径

了解Groovy基本语法，以及Groovy与Java、Gardle、JVM之间的关系
粗读Gradle User Guide 和 [Gradle Plugins User] Guide(https://docs.gradle.org/current/userguide/plugins.html)
实践再实践，无他，唯手熟尔

Code snippets

打印所有task的输入与输出

如题，分析Gradle构建问题和学习项目的构建逻辑的必备code snippets
说明：
1.知道输入与输出是分析问题的关键，能顺藤摸瓜，定位问题
2.了解输入与输出即于结果去看代码，总比看代码去理解任务的逻辑，特别是gradle这类解析型弱态型系统的代码。
** 如下代码来源于网络 **

//如下代码copy到build.gradle文件即可
gradle.taskGraph.afterTask { task ->
    try {

        StringBuffer taskDetails = new StringBuffer()
        taskDetails << """"-------------
name:$task.name group:$task.group : $task.description
conv:$task.convention.plugins
inputs:
"""
        task.inputs.files.each{ it ->
            taskDetails << " ${it.absolutePath}\n"
        }
        taskDetails << "outputs:\n"
        task.outputs.files.each{ it ->
            taskDetails << " ${it.absolutePath}\n"
        }

        taskDetails << "-------------"
        println taskDetails
    }
    catch(Exception e) {

    }
}

打印所有task的依赖

如题，分析Gradle构建问题和学习项目的构建逻辑的必备code snippets
** 如下代码来源于网络 **

//如下代码copy到build.gradle文件即可
gradle.getTaskGraph().whenReady {
    project.tasks.all {
        Task t = it
        String taskName = it.name
        println("--------taskName-----------:" + taskName + " :" + it.getPath())
        it.getTaskDependencies().any {
            println("-----------------taskName----dependsOn-----------------:")
            it.getDependencies(t).findAll() {
                println("----------------------------------:" + it.getPath())
            }
        }

    }
}

监控所有任务

优化脚本的时候可能使用，看看那个操作逻辑比较耗时，针对性优化之
** 如下代码来源于网络 **

//如下代码copy到build.gradle文件即可
class TimingsListener implements TaskExecutionListener, BuildListener {
    private Clock clock
    private timings = []

    @Override
    void beforeExecute(Task task) {
        clock = new org.gradle.util.Clock()
    }

    @Override
    void afterExecute(Task task, TaskState taskState) {
        def ms = clock.timeInMs
        timings.add([ms, task.path])
        task.project.logger.warn "${task.path} took ${ms}ms"
    }

    @Override
    void buildFinished(BuildResult result) {
        println "Task timings:"
        for (timing in timings) {
            if (timing[0] >= 50) {
                printf "%7sms  %s\n", timing
            }
        }
    }

    @Override
    void buildStarted(Gradle gradle) {}

    @Override
    void projectsEvaluated(Gradle gradle) {}

    @Override
    void projectsLoaded(Gradle gradle) {}

    @Override
    void settingsEvaluated(Settings settings) {}
}

gradle.addListener new TimingsListener()

常用命令

生成Wrapper脚本

gradlew可以统一构建的gradle构建环境，避免各个环境的差异导致构建失败或产生兼容性的构建问题

gradle wrapper

查看所有tasks

查看所有tasks一方面可以快速上手新的项目的打包，另一方面可以知道引入的插件有那些任务（避免写多余的自定义任务）

./gradlew tasks --all

如下示例

luogw@luogw-MacBook-Pro firsetGradle$ ./gradlew tasks --all
:tasks

------------------------------------------------------------
All tasks runnable from root project
------------------------------------------------------------

Application tasks
-----------------
run - Runs this project as a JVM application

Build tasks
-----------
assemble - Assembles the outputs of this project.
build - Assembles and tests this project.
buildDependents - Assembles and tests this project and all projects that depend on it.
buildNeeded - Assembles and tests this project and all projects it depends on.
classes - Assembles main classes.
clean - Deletes the build directory.
jar - Assembles a jar archive containing the main classes.
testClasses - Assembles test classes.

Build Setup tasks
-----------------
init - Initializes a new Gradle build.
wrapper - Generates Gradle wrapper files.

Distribution tasks
------------------
assembleDist - Assembles the main distributions
distTar - Bundles the project as a distribution.
distZip - Bundles the project as a distribution.
installDist - Installs the project as a distribution as-is.

Documentation tasks
-------------------
javadoc - Generates Javadoc API documentation for the main source code.

Help tasks
----------
buildEnvironment - Displays all buildscript dependencies declared in root project 'firsetGradle'.
components - Displays the components produced by root project 'firsetGradle'. [incubating]
dependencies - Displays all dependencies declared in root project 'firsetGradle'.
dependencyInsight - Displays the insight into a specific dependency in root project 'firsetGradle'.
dependentComponents - Displays the dependent components of components in root project 'firsetGradle'. [incubating]
help - Displays a help message.
model - Displays the configuration model of root project 'firsetGradle'. [incubating]
projects - Displays the sub-projects of root project 'firsetGradle'.
properties - Displays the properties of root project 'firsetGradle'.
tasks - Displays the tasks runnable from root project 'firsetGradle'.

Verification tasks
------------------
check - Runs all checks.
test - Runs the unit tests.

Other tasks
-----------
compileJava - Compiles main Java source.
compileTestJava - Compiles test Java source.
copyLicense
processResources - Processes main resources.
processTestResources - Processes test resources.
startScripts - Creates OS specific scripts to run the project as a JVM application.

Rules
-----
Pattern: clean<TaskName>: Cleans the output files of a task.
Pattern: build<ConfigurationName>: Assembles the artifacts of a configuration.
Pattern: upload<ConfigurationName>: Assembles and uploads the artifacts belonging to a configuration.

BUILD SUCCESSFUL

Total time: 1.07 secs

查看所有prjects/模块

./gradlew projects

查看所有projects/模块的依赖

./gradlew dependencies

Gradle学习与使用技巧点的收集与汇总