[CONF] Apache Felix: Accessing services inside inner and anonymous classes (page created)

[confluence]

Page Created : FELIX : Accessing services inside inner and anonymous classes Accessing services inside inner and anonymous classes has been created by Clement Escoffier (Jul 28, 2008). Content: Accessing services inside inner and anonymous classes An inner class is a class defined inside another class. This mechanism is useful in order to avoid creating a bunch of small files. So, it is common when creating threads, Swing listeners ... Generally speaking, inner classes are regular classes treated as separate classes. However this is an oversimplification. Some of the information about an inner class is not in its class file. See section 4.7.5 for further details: http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html An inner class can access fields of its outer class. However, when using a field managed by iPOJO, such as a service dependency, the injected object is not accessible. The reason of this behavior is that the inner class accesses the field directly and not with the "injected" getter. In order to access managed fields, you need to create your own getter method and call it instead of accessing the field directly. public class AClass { private Service m_service; // Injected service private void launchAThread() { // This is an anonymous class Runnable thread = new Runnable() { public void run() { // ... // Access throught a getter method getService().doSomething(); // ... }; thread.start(); } private Service getService() { // Getter method to add return m_service; } } Overview Home Page iPOJO Feature Overview Download & Install Getting Started iPOJO in 10 minutes iPOJO Hello Word (Maven-Based) tutorial iPOJO Advanced Tutorial User Guide Describing components (handler list) How to use iPOJO Annotations Advanced Topics FAQ Tools iPOJO Eclipse Plug-in iPOJO Ant Task iPOJO Maven Plug-in iPOJO concepts overview Developer Guide How to write your own handler How to use iPOJO Manipulation Metadata Misc & Contact Issues Tracker Supported JVMs Supported OSGi Implementations Future Ideas Contact Related Works Article & Presentations

Powered by Atlassian Confluence (Version: 2.2.9 Build:#527 Sep 07, 2006) - Bug/feature request

Unsubscribe or edit your notifications preferences