How to create and use a gradle task factory function - gradle

Question

How do I create a function that create function or maybe I should ask to call it
// cant use this method see comment tagged ERROR further down
def webRollbackFactory(parentTask) {
tasks.create(name: "webRollback.${parentTask.name}", type: Copy, dependsOn: [webBackup]) {
onlyIf { patentTask.state.failure != null }
from(zipTree("${webPublishPath}/../${getWebBackupName()}")) { include '*' }
into webPublishPath
doLast {
println "\nwebRollback.${parentTask.name}.doLast"
}
}
}
// this task which do the same works with out problems
task webRollback_webPublish(type: Copy) {
onlyIf { webPublish.state.failure != null }
from(zipTree("${webPublishPath}/../${getWebBackupName()}")) { include '*' }
into webPublishPath
doLast {
println "\nwebRollback.webPublish.doLast"
}
}
task webPublish(type: com.ullink.Msbuild) {
dependsOn msbuild, webBackup
projectFile = "${webPublishProjectDir}/${webPublishProjectFileName}"
targets = ['Publish']
parameters = [PublishProfile: webPublishProfile]
configuration = BUILD_TYPE
parameters.maxcpucount
doLast {
println '\nwebPublish.doLast'
}
// ERROR: fails with: Could not find method webRollbackFactoy() for arguments [task ':webAccessTest'] on task ':webAccessTest' of type org.gradle.api.tasks.Exec.
//finalizedBy webRollbackFactory(webPublish)
// the version that works
finalizedBy webRollback_webPublish
}
I am on Gradle 4.8

Answer 1

The reason you get that error is because the closure being evaluated does not find the function declared in the main file.
Try changing your function to a closure as a variabe reference and then it should work.
webRollbackFactory = { parentTask ->
tasks.create(name: "webRollback.${parentTask.name}", type: Copy, dependsOn: [webBackup]) {
onlyIf { patentTask.state.failure != null }
from(zipTree("${webPublishPath}/../${getWebBackupName()}")) { include '*' }
into webPublishPath
doLast {
println "\nwebRollback.${parentTask.name}.doLast"
}
}
}