Run two subproject tasks simultaneously

Help/Discuss
1

I have a monorepo setup such as:

monorepo
 build.gradle
 /api
   build.gradle
 /webapp
   build.gradle

I’ve two separate tasks which build and run a development server: :api:bootRun and :webapp:runDev.

Is it possible to get these two tasks to run in parallel? They are not dependent on each other until the build task bootJar is run - which is outside the scope.

I’m currently trying to work around this using GPars, but to no avail:

tasks.register("dev") {
    def tasksToRun = ['api:bootRun', 'webapp:runDev']

    GParsPool.withPool { ExecutorService svc -> 
        tasksToRun.each { taskToRun ->
            svc.submit({runDevTaskFromProject(tasksToRun)})
        }
    }
}

def runDevTaskFromProject(String projectTask) {
    try {
        String[] components = projectTask.split(':')
        GradleRunner.create()
            .withProjectDir("$projectDir/" + components[0])
            .withArguments(components[1])
            .forwardOutput()
            .build()
    } catch (Exception e) {
        println "Run Failed " + e
        return
    }
}

Is there a better way of doing this - or do I need to write something based on the Workers API to facilitate this?

2

Things using the worker api and do not depend on each other can run in parallel, even within one project, yes.
Another point is, that --parallel or org.gradle.parallel enables tasks of different projects to run in parallel, so would probably also help you.

3

Thanks @Vampire

I believe org.gradle.parallel=true is set in the project level gradle.properties;

How would I structure the parent task to use with --parallel?

4

The property and parameter do the same.
But no idea what you mean with your question.

5

@Vampire for the question, how do I write that task so that the two subtasks (which have different names) are called in parallel?

6

Just depend on them I guess?

7

Wow - that worked, I didn’t know parallel worked on dependsOn thanks :slight_smile: