By Tim Berglund, Matthew McCullough
Construct and try software program written in Java and plenty of different languages with Gradle, the open resource venture automation software that is getting loads of realization. This concise creation offers quite a few code examples that can assist you discover Gradle, either as a construct instrument and as an entire answer for automating the compilation, attempt, and unencumber strategy of uncomplicated and enterprise-level purposes. detect how Gradle improves at the top principles of Ant, Maven, and different construct instruments, with criteria for builders who wish them and many flexibility in the event you want much less constitution.
Read or Download Building and Testing with Gradle: Understanding Next-Generation Builds PDF
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Additional resources for Building and Testing with Gradle: Understanding Next-Generation Builds
So far, we’ve been creating tasks by coding them directly, either inside Gradle build scripts or in the buildSrc directory as Groovy code. This is a great way to learn about tasks, because it’s easy to see all of the moving parts in great detail. However, many of the tasks you use won’t be tasks you write; they’ll come from plug-ins. You’ve already seen an example of this in the section on building Java code. By applying the Java plug-in, the build script automatically inherits a set of tasks whose code you never directly see.
During the execution phase, the action block of every relevant task is executed. The doFirst method allows you to add a bit of behavior to the beginning of an existing action, even if that action is defined by a build file or a plug-in you don’t control. Calling doFirst multiple times keeps appending new blocks of action code to the beginning of the task’s execution sequence. You can invoke the doFirst method directly on the task object, passing a closure to the method. The closure contains the code to run before the task’s existing action.
The output of the preceding example $ gradle world :setupDatabaseTests drop database schema create database schema load test data $ Of course, it’s somewhat contrived to break one initialization sequence into three separate closures and calls to doFirst(), as we’ve done here. However, sometimes the initial definition of a task isn’t immediately available to change as you see fit—for example, in cases in which the task is defined in another build file that is impossible or impractical for you to modify.