Package org.apache.felix.dm.lambda

Interface FluentProperty

All Superinterfaces:

Serializable, SerializableLambda

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface FluentProperty
extends SerializableLambda

Deprecated.

this interface is only supported with java8 and will be removed in next dm release

Lambda allowing to define fluent service properties. Property names are deduces from the lambda parameter name.

Example of a component which provides fluent properties {"foo"="bar"; "foo2"=Integer(123)}:

 public class Activator extends DependencyManagerActivator {
   public void init(BundleContext ctx, DependencyManager dm) throws Exception {
       component(comp -> comp.impl(MyComponentImpl.class).provides(MyService.class, foo->"bar", foo2 -> 123));
   }
 } 
 

When a property name contains dots ("."), then since it's not possible to declare a lambda parameter with some dots, you can encode the dots using some underscores. A single underscore is then converted to a dot, unless is it followed by another underscore in which case the two consecutive underscores ("__") are converted to a single underscore. For example, assume your component provides a service using the two service.ranking and foo_bar service properties. In this case you would declare the service properties like this:

 public class Activator extends DependencyManagerActivator {
   public void init(BundleContext ctx, DependencyManager dm) throws Exception {
       component(comp -> comp.impl(MyComponentImpl.class).provides(MyService.class, service_ranking->10, foo__bar -> "gabuzo"));
   }
 } 
 

Caution: Fluent properties requires the usage of the "-parameter" javac option. Under eclipse, you can enable this option using:

 Windows -> Preference -> Compiler -> Classfile Generation -> Store information about method parameters.
 

WARNING: this is interface is deprecated, it is only supported when using java8, not on java9+, and we will remove it in next DM release

Method Summary

Modifier and Type	Method	Description
Object	apply(String name)	Deprecated. Represents a fluent property

Method Details

apply

Object apply(String name)

Deprecated.

Represents a fluent property

Parameters:

name - the property name. The parameter used by the lambda will be intropsected and will be used as the actual property name.

Returns:

the property value