Date: 2004-07-12T00:36:27
Editor: 211.29.167.17 <>
Wiki: Apache Geronimo Wiki
Page: GBeans
URL: http://wiki.apache.org/geronimo/GBeans
no comment
Change Log:
------------------------------------------------------------------------------
@@ -24,27 +24,32 @@
== Let us Write a GBean ==
- * They should implements the GBeanLifecycle interface
+ * A GBean may implement the org.apache.geronimo.gbean.GBeanLifecycle
interface. If it implements this interface, then it will receive life-cycle
call-backs from the IoC framework.
* They can have attributes with getters and setters, There are attributes
that are final and I think they are standard .. (What is the list of them) e.g.
name, Kernel (they can use to get hold of the system info, have a look at the
sample GBeans.) There are ordinary attributes .. have getters and setters
* GBeans can have methods ..
- * each GBean should have GBEAN_INFO attribute (see exapmles)
+ * A GBean MUST implement a method having the following signature:
{{{
-static {
-GBeanInfoFactory infoFactory = new GBeanInfoFactory("AxisGbean",
-AxisGbean.class);
-//attributes
-infoFactory.addAttribute("Name", String.class, true);
-infoFactory.addAttribute("kernel", Kernel.class, false);
-//operations
-infoFactory.addOperation("echo", new Class[]{String.class});
+public static GBeanInfo getGBeanInfo();
+}}}
+This method provides meta-data about the attributes, operations and references
exposed or used by a GBean. It is standard practice to initialize this
meta-data in a static block initializer. The following block depicts such an
approach:
+{{{
+public static final GBeanInfo GBEAN_INFO;
-infoFactory.setConstructor(new String[] {"kernel","Name"});
-GBEAN_INFO = infoFactory.getBeanInfo();
+static {
+ GBeanInfoFactory infoFactory = new GBeanInfoFactory("AxisGbean",
+ AxisGbean.class);
+ infoFactory.addAttribute("name", String.class, true);
+ infoFactory.addAttribute("kernel", Kernel.class, false);
+ infoFactory.addOperation("echo", new Class[]{String.class});
+ infoFactory.setConstructor(new String[] {"kernel","Name"});
+ GBEAN_INFO = infoFactory.getBeanInfo();
}
}}}
+Attributes and references MUST be compliant wit the following naming
conventions: attributes MUST start with a lower case first character; and
references must should start with an upper case first character. This simple
naming convention should simplify the configuration of a GBean.
+
* following two are call back methods there are more
{{{
public void doStart() throws WaitingException, Exception {
@@ -66,7 +71,7 @@
ClassLoader cl = getClass().getClassLoader();
ClassLoader myCl = new URLClassLoader(new URL[0], cl);
GBeanMBean gbean = new GBeanMBean(AxisGbean.getGBeanInfo(), myCl);
-gbean.setAttribute("Name", "Test");
+gbean.setAttribute("name", "Test");
kernel.loadGBean(name, gbean);
Kernel.startGBean(name);
@@ -82,7 +87,6 @@
== What is GBean Meta Data? ==
== What does the GBeanInfo class represent? ==
-== Does my GBean have to implement GBeanLifecycle? ==
== Can I configure my GBean using a flat file? ==
== How do I manage the attributes of my GBean remotely? ==
