| /** |
| * 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.camel.blueprint; |
| |
| import java.lang.reflect.Modifier; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.camel.RoutesBuilder; |
| import org.apache.camel.spi.PackageScanClassResolver; |
| import org.osgi.service.blueprint.container.BlueprintContainer; |
| import org.osgi.service.blueprint.reflect.BeanMetadata; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A helper class which will find all {@link org.apache.camel.builder.RouteBuilder} instances on the classpath |
| * |
| * @version |
| */ |
| public class PackageScanRouteBuilderFinder { |
| private static final transient Logger LOG = LoggerFactory.getLogger(PackageScanRouteBuilderFinder.class); |
| private final BlueprintCamelContext camelContext; |
| private final String[] packages; |
| private final PackageScanClassResolver resolver; |
| private final BlueprintContainer blueprintContainer; |
| // private final BeanPostProcessor beanPostProcessor; |
| |
| public PackageScanRouteBuilderFinder(BlueprintCamelContext camelContext, String[] packages, ClassLoader classLoader, |
| /*BeanPostProcessor postProcessor,*/ PackageScanClassResolver resolver) { |
| this.camelContext = camelContext; |
| this.blueprintContainer = camelContext.getBlueprintContainer(); |
| this.packages = packages; |
| // this.beanPostProcessor = postProcessor; |
| this.resolver = resolver; |
| // add our provided loader as well |
| resolver.addClassLoader(classLoader); |
| } |
| |
| /** |
| * Appends all the {@link org.apache.camel.builder.RouteBuilder} instances that can be found on the classpath |
| */ |
| public void appendBuilders(List<RoutesBuilder> list) throws IllegalAccessException, InstantiationException { |
| Set<Class<?>> classes = resolver.findImplementations(RoutesBuilder.class, packages); |
| for (Class aClass : classes) { |
| LOG.trace("Found RouteBuilder class: {}", aClass); |
| |
| // certain beans should be ignored |
| if (shouldIgnoreBean(aClass)) { |
| LOG.debug("Ignoring RouteBuilder class: {}", aClass); |
| continue; |
| } |
| |
| if (!isValidClass(aClass)) { |
| LOG.debug("Ignoring invalid RouteBuilder class: {}", aClass); |
| continue; |
| } |
| |
| // type is valid so create and instantiate the builder |
| RoutesBuilder builder = instantiateBuilder(aClass); |
| // if (beanPostProcessor != null) { |
| // Inject the annotated resource |
| // beanPostProcessor.postProcessBeforeInitialization(builder, builder.toString()); |
| // } |
| LOG.debug("Adding instantiated RouteBuilder: {}", builder); |
| list.add(builder); |
| } |
| } |
| |
| /** |
| * Lets ignore beans that are explicitly configured in the Spring XML files |
| */ |
| protected boolean shouldIgnoreBean(Class<?> type) { |
| for (Object metadataObject : blueprintContainer.getMetadata(BeanMetadata.class)) { |
| BeanMetadata metadata = (BeanMetadata) metadataObject; |
| if (BeanMetadata.SCOPE_SINGLETON.equals(metadata.getScope())) { |
| Object bean = blueprintContainer.getComponentInstance(metadata.getId()); |
| if (type.isInstance(bean)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * Returns true if the object is non-abstract and supports a zero argument constructor |
| */ |
| protected boolean isValidClass(Class type) { |
| if (!Modifier.isAbstract(type.getModifiers()) && !type.isInterface()) { |
| return true; |
| } |
| return false; |
| } |
| |
| @SuppressWarnings("unchecked") |
| protected RoutesBuilder instantiateBuilder(Class type) throws IllegalAccessException, InstantiationException { |
| return (RoutesBuilder) camelContext.getInjector().newInstance(type); |
| } |
| } |