[移动开发]gradle构建工具学习系列–013任务执行图监听器

gradle构建工具学习系列

用于监听task执行图事件的接口是由TaskExecutionGraphListener实现的。

通过监听器挂接到生命周期只需要两个步骤
1. 实现特定监听器接口

class ReleaseVersionListener implements TaskExecutionGraphListener {
    final static String releaseTaskPath = ':release'

    @Override
    void graphPopulated(TaskExecutionGraph taskGraph) {
        if (taskGraph.hasTask(releaseTaskPath)) {
            List<Task> allTasks = taskGraph.allTasks
            Task releaseTask = allTasks.find { it.path == releaseTaskPath }
            Project project = releaseTask.project

            if (!project.version.release) {
                project.version.release = true
                project.ant.propertyfile(file: project.versionFile) {
                    entry(key: 'release', type: 'string', operation: '=', value: 'true')
                }
            }
        }
    }
}

2. 注册监听器实现

gradle.taskGraph.addTaskExecutionGraphListener(new ReleaseVersionListener())

以下为构造脚本build.gradle完整代码

apply plugin: 'war'
ext.versionFile = file('version.properties')

task loadVersion {
    project.version = readVersion()
}

ProjectVersion readVersion() {
    logger.quiet 'Reading the version file.'

    if (!versionFile.exists()) {
        throw new GradleException("Required version file does not exit: $versionFile.canonicalPath")
    }

    Properties versionProps = new Properties()

    versionFile.withInputStream { stream ->
        versionProps.load(stream)
    }

    new ProjectVersion(versionProps.major.toInteger(), versionProps.minor.toInteger(), versionProps.release.toBoolean())
}

class ReleaseVersionListener implements TaskExecutionGraphListener {
    final static String releaseTaskPath = ':release'

    @Override
    void graphPopulated(TaskExecutionGraph taskGraph) {
        if (taskGraph.hasTask(releaseTaskPath)) {
            List<Task> allTasks = taskGraph.allTasks
            Task releaseTask = allTasks.find { it.path == releaseTaskPath }
            Project project = releaseTask.project

            if (!project.version.release) {
                project.version.release = true
                project.ant.propertyfile(file: project.versionFile) {
                    entry(key: 'release', type: 'string', operation: '=', value: 'true')
                }
            }
        }
    }
}

gradle.taskGraph.addTaskExecutionGraphListener(new ReleaseVersionListener())

task createDistribution(type: Zip) {
    from war.outputs.files

    from(sourceSets*.allSource) {
        into 'src'
    }

    from(rootDir) {
        include versionFile.name
    }
}

task backupReleaseDistribution(type: Copy) {
    from createDistribution.outputs.files
    into "$buildDir/backup"
}

task release(dependsOn: backupReleaseDistribution) << {
	doLast{
	   logger.quiet 'Releasing the project...'
	}
}

tasks.addRule("Pattern: increment<Classifier>Version – Increments the project version classifier.") { String taskName ->
    if (taskName.startsWith('increment') && taskName.endsWith('Version')) {
        task(taskName){
			doLast {
				String classifier = (taskName - 'increment' - 'Version').toLowerCase()
				String currentVersion = version.toString()

				switch (classifier) {
					case 'major': ++version.major
						break
					case 'minor': ++version.minor
						break
					default: throw new GradleException("Invalid version type '$classifier. Allowed types: ['Major', 'Minor']")
				}

				String newVersion = version.toString()
				logger.info "Incrementing $classifier project version: $currentVersion -> $newVersion"

				ant.propertyfile(file: versionFile) {
					entry(key: classifier, type: 'int', operation: '+', value: 1)
				}
			}
        }
    }
}

class ProjectVersion {
    Integer major
    Integer minor
    Boolean release

    ProjectVersion(Integer major, Integer minor) {
        this.major = major
        this.minor = minor
        this.release = Boolean.FALSE
    }

    ProjectVersion(Integer major, Integer minor, Boolean release) {
        this(major, minor)
        this.release = release
    }

    @Override
    String toString() {
        "$major.$minor${release ? '' : '-SNAPSHOT'}"
    }
}

执行后结果版本文件内容被修改，如下所示