PostConstructRunner.java

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package com.sun.enterprise.admin.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.PrivilegedActionException;
import java.util.LinkedList;
import javax.annotation.PostConstruct;

/**
 *
 * @author tjquinn
 */
public class PostConstructRunner {
    
    public static void runPostConstructs(final Object obj) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, PrivilegedActionException {
        /*
         * As we ascend the hierarchy, record the @PostConstruct methods we find
         * at each level at the beginning of the list.  After we have processed
         * the whole hierarchy, the highest-level @PostConstruct methods will be
         * first in the list. Processing them from first to last will execute them
         * from the top of the hierarchy down.
         */
        final LinkedList<Method> postConstructMethods = new LinkedList<Method>();
        for (ClassLineageIterator cIT = new ClassLineageIterator(obj.getClass()); cIT.hasNext(); ) {
            final Class<?> c = cIT.next();
            for (Method m : c.getDeclaredMethods()) {
                /*
                 * The injection manager will already have run a postConstruct
                 * method if the class implements the hk2 PostConstruct interface,
                 * so don't invoke it again if the developer also annotated it
                 * with @PostConstruct.  Ideally this will eventually migrate into
                 * the injection manager implementation.
                 */
                if (m.getAnnotation(PostConstruct.class) != null) {
                    if ( ( ! PostConstruct.class.isAssignableFrom(c)) || ! m.getName().equals("postConstruct")) {
                        postConstructMethods.addFirst(m);
                    }
                }
            }
        }
        for (final Method m : postConstructMethods) {
            java.security.AccessController.doPrivileged(
                new java.security.PrivilegedExceptionAction() {
                    public java.lang.Object run() throws Exception {
                        if( !m.isAccessible() ) {
                            m.setAccessible(true);
                        }
                        m.invoke(obj);
                        return null;
                    }
                });
        }
    }
    
}