gistfile1.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.webbeans.web.tomcat;

import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

public class TomcatUtil
{
    private final static Map<Object,Object> CREATIONAL_CONTEXT_INSTANCES = new ConcurrentHashMap<Object, Object>();

    public static Object inject(Object object, ClassLoader loader) throws Exception
    {

        // why all this reflection stuff here?

        final Class<?> injector = loader.loadClass("org.apache.webbeans.inject.OWBInjector");
        final Class<?> bmClazz = loader.loadClass("javax.enterprise.inject.spi.BeanManager");
        final Class<?> ccClazz = loader.loadClass("javax.enterprise.context.spi.CreationalContext");
        final Method method = injector.getMethod("inject", bmClazz, Object.class, ccClazz);

        final Object bm = getBeanManager(loader);

        final Class<?> c = loader.loadClass("javax.enterprise.context.spi.Contextual");
        final Method ccc = bmClazz.getMethod("createCreationalContext", c);
        final Object cc = ccc.invoke(bm);

        CREATIONAL_CONTEXT_INSTANCES.put(object, cc);

        return method.invoke(object, bm, object, cc);       
    }

    private static Object getBeanManager(ClassLoader loader) throws Exception
    {
        final Class<?> wbcClazz = loader.loadClass("org.apache.webbeans.config.WebBeansContext");
        final Method getBm = wbcClazz.getMethod("getBeanManagerImpl");
        final Object wbc = wbcClazz.getMethod("currentInstance").invoke(null);
        return getBm.invoke(wbc);
    }

    public static void destroy(Object injectorInstance, ClassLoader loader) throws Exception
    {
        final Object bm = getBeanManager(loader);
        final Method gitw = bm.getClass().getMethod("getInjectionTargetWrapper", Class.class);
        final Object itw = gitw.invoke(injectorInstance.getClass());
        final Object ocw = CREATIONAL_CONTEXT_INSTANCES.remove(injectorInstance);

        if (itw != null)
        {
            loader.loadClass("org.apache.webbeans.component.InjectionTargetWrapper")
                    .getMethod("dispose")
                        .invoke(injectorInstance);
        }
        else
        {
            if (ocw != null) {
                final Class<?> ccClazz = loader.loadClass("javax.enterprise.context.spi.CreationalContext");
                ccClazz.getMethod("release").invoke(ocw);
            }
        }
    }

}