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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * Licensed 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.fabric3.implementation.spring.runtime.component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.fabric3.spi.container.invocation.Message;
import org.fabric3.spi.container.wire.Interceptor;
import org.fabric3.spi.container.wire.InvocationRuntimeException;
import org.oasisopen.sca.ServiceRuntimeException;
import org.springframework.beans.BeansException;

/**
 * Invokes a target Spring bean. When the bean is invoked, the thread context classloader will be set to the classloader for the contribution that
 * contains the application context.
 */
public class SpringInvoker implements Interceptor {
    private String beanName;
    private SpringComponent component;
    private Object beanProxy;
    private Method beanMethod;
    private ClassLoader targetTCCLClassLoader;

    public SpringInvoker(String beanName, Method beanMethod, SpringComponent component) {
        this.beanName = beanName;
        this.beanMethod = beanMethod;
        this.component = component;
        targetTCCLClassLoader = component.getClassLoader();
    }

    public Message invoke(Message msg) {
        try {
            if (beanProxy == null) {
                beanProxy = component.getBean(beanName);
                if (beanProxy == null) {
                    throw new ServiceRuntimeException("Bean not found:" + beanName);
                }
            }
            Object body = msg.getBody();
            ClassLoader old = Thread.currentThread().getContextClassLoader();
            try {
                Thread.currentThread().setContextClassLoader(targetTCCLClassLoader);
                msg.setBody(beanMethod.invoke(beanProxy, (Object[]) body));
            } finally {
                Thread.currentThread().setContextClassLoader(old);
            }
        } catch (InvocationTargetException e) {
            Throwable cause = e.getCause();
            Package pkg = cause.getClass().getPackage();
            if (cause instanceof RuntimeException && pkg != null && pkg.getName().startsWith("org.springframework.")) {
                // an exception generated by Spring - treat it as an infrastructure failure
                cause = new ServiceRuntimeException(cause);
            }
            msg.setBodyWithFault(cause);
        } catch (IllegalAccessException e) {
            throw new InvocationRuntimeException(e);
        } catch (BeansException e) {
            // this should not happen at this point
            throw new InvocationRuntimeException("Error invoking bean: " + beanName, e);
        }
        return msg;
    }

    public void setNext(Interceptor next) {
        throw new IllegalStateException("This interceptor must be the last one in an target interceptor chain");
    }

    public Interceptor getNext() {
        return null;
    }

}