JRuby proc作为Java接口实现

Question

My question is related to closure conversion . I want to test a proc that implements a functional interface from jruby code.

I have a simple proc like

proc { print 'hey!' }

to implement a java functional interface like

public void doStuff()

Since the client object is a Java object that is

public class MyClient {
    private MyInterface iface;

    public MyClient(MyInterface iface) {
        this.iface = iface;
    }

    public void doHighLevelStuff() {
        this.iface.doStuff();
    }
}

it works right, since jruby manages to "cast" the proc into a java functional interface. So, this part it's ok.

My problem is testing this code, calling it from jruby. I don't know how to tell jruby to treat that proc as an implementation of MyInterface to be able to call the actual method doStuff instead of the ruby specification call .

So, the question is how to tell jruby to treat a proc as a given java interface.

Answer 1

client = MyClient.new { print 'hey! } client = MyClient.new { print 'hey! } and then client.doHighLevelStuff should work just fine ... if you have a proc instance simply pass it in ( &proc ) as a block into the constructor.