Gradle extension call constructor

Question

I am writing a custom plugin for Gradle. I want to be able to:

serviceDependencies { service name: 'service1', version: '1.0' service name: 'service2', version: '1.1' } 

In my plugin implementation (in Java), I have:

 public void apply(final Project project) { project.getExtensions().create("serviceDependencies", Services.class); project.getExtensions().create("service", Service.class); } 

And Service.java:

 public class Service { private String name; private String version; public Service(final String name, final String version) { this.name = name; this.version = version; } public String getName() { return this.name; } public void setName(final String name) { this.name = name; } public String getVersion() { return this.version; } public void setVersion(final String version) { this.version = version; } } 

When I try to use this plugin, I get:

 java.lang.IllegalArgumentException: Could not find any public constructor for class com.xxx.xxx.Service_Decorated which accepts parameters []. 

This happens when I remove serviceDependencies / Services.java from the picture.

If I remove the service constructor or delete the arguments.

 org.gradle.internal.metaobject.AbstractDynamicObject$CustomMessageMissingMethodException: Could not find method service() for arguments [{name=service1, version=1.0}] on root project ... 

Obviously, my pojo is styled, but not quite with the right constructor. How can I make the constructor work as I want in my build.gradle script?

The second and independent question is what does Service.java look like?

Answer 1

I would register only one extension for serviceDependencies {} which provides functions for registering your services:

 public class Services { void service(String name, String version) { /* new Service(...) */ } } project.getExtensions().create("serviceDependencies", Services.class); 

This would allow Java, Kotlin, and Groovy users to do something like:

 serviceDependencies { service 'service1', '1.0' service 'service2', '0.1' } 

Then, if you want to support Groovy named arguments, you need to add:

 public class Services { void service(String name, String version) { /* new Service(...) */ } void service(Map<String, String> namedArguments) { service(namedArguments.get("name"), namedArguments.get("version")) } } 

This will allow Groovy consumers to do:

 serviceDependencies { service name: 'service1', version: '1.0' service name: 'service2', version: '0.1' }