org.apache.felix.dm.lambda

Interface FluentProperty

All Superinterfaces:

java.io.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.

Deprecated.

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

@FunctionalInterface
public interface FluentProperty
extends SerializableLambda

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 and Description
java.lang.Object	apply(java.lang.String name) Deprecated. Represents a fluent property

Method Detail

apply

java.lang.Object apply(java.lang.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