Friday, February 07, 2014

ServiceBinder

I've released ServiceBinder 0.2 to Maven Central (details below; soon to be 0.3 with more documentation). I wrote this to fix a common problem for my projects.

I like using the JDK ServiceLoader for discovery: it is simple to use and understand and always available. And Kawaguchi's META-INF/services generator makes use as simple as an annotation.

However, ServiceLoader is missing one key feature for me. It requires a default constructor for implementations, and I am a fan of constructor injection.

ServiceBinder fills this gap. It discovers service classes as ServiceLoader does, and injects them with Guice or Spring. See the GitHub site for examples and source. A taste:

Guice

public final class SampleModule
        extends AbstractModule {
    @Override
    protected void configure() {
        ServiceBinder.with(binder()).bind(Bob.class);
    }
}

Spring Framework

AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
context.register(AppConfig.class);
ServiceBinder.with(context).bind(Bob.class);
context.refresh();
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