org.glassfish.osgi.ee.resources.ResourceProxy Maven / Gradle / Ivy
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package org.glassfish.osgi.ee.resources;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
/**
* ResourceProxy that can delegate to actual objects upon usage.
* Does not cache the actual object as the actual object can be re-configured
*
* @author Jagadish Ramu
*/
public class ResourceProxy implements InvocationHandler, Invalidate {
private String jndiName;
private boolean invalidated = false;
public ResourceProxy(String jndiName) {
this.jndiName = jndiName;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Object result = null;
if (method.getName().equals("invalidate")) {
invalidate();
} else {
result = method.invoke(getActualObject(), args);
}
return result;
}
/**
* It is possible that reconfiguration of resource will happen.
* Always do lookup.
*/
private Object getActualObject() {
if (!invalidated) {
try {
return new InitialContext().lookup(jndiName);
} catch (NamingException e) {
throw new RuntimeException(e.getMessage(), e);
}
} else {
throw new RuntimeException("Resource [" + jndiName + "] is invalidated");
}
}
/**
* Sets the state of the proxy as invalid
*/
public void invalidate() {
invalidated = true;
}
}