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Here is a really simple SCA component implemented in Java:
public interface Orange { // methods } public class AppleImpl implements Apple { private Orange orange; public AppleImpl(Orange orange) { this.orange = orange; } // other methods }
Yes, this is the same as the simplest possible Pico component and it really is a fully functional SCA implementation. Tuscany uses the following conventions to figure out how to run this when you include it in an SCA assembly:
- the class implements a single interface "Apple", so there is one service defined by that interface
- there is a single constructor with a value that is not a simple type, we treat that as a reference to the "Orange" service
- there are no properties or intents to deal with