001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.blueprint;
018
019import org.apache.camel.CamelContext;
020import org.apache.camel.Component;
021import org.apache.camel.core.osgi.OsgiComponentResolver;
022import org.apache.camel.spi.ComponentResolver;
023import org.apache.camel.support.ResolverHelper;
024import org.osgi.framework.BundleContext;
025import org.osgi.service.blueprint.container.ComponentDefinitionException;
026import org.osgi.service.blueprint.container.NoSuchComponentException;
027import org.slf4j.Logger;
028import org.slf4j.LoggerFactory;
029
030import static org.apache.camel.util.ObjectHelper.getException;
031
032public class BlueprintComponentResolver extends OsgiComponentResolver {
033
034    private static final Logger LOG = LoggerFactory.getLogger(BlueprintComponentResolver.class);
035
036    public BlueprintComponentResolver(BundleContext bundleContext) {
037        super(bundleContext);
038    }
039
040    @Override
041    public Component resolveComponent(String name, CamelContext context) throws Exception {
042
043        Component componentReg = ResolverHelper.lookupComponentInRegistryWithFallback(context, name, new ResolverHelper.LookupExceptionHandler() {
044            @Override
045            public void handleException(Exception e, Logger log, String name) {
046                if (getException(NoSuchComponentException.class, e) != null) {
047                    // if the caused error is NoSuchComponentException then that can be expected so ignore
048                } else if (getException(ComponentDefinitionException.class, e) != null) {
049                    LOG.warn("Problem looking up bean: " + name + " due: " + e.getMessage(), e);
050                } else {
051                    LOG.trace("Ignored error looking up bean: " + name + " due: " + e.getMessage(), e);
052                }
053            }
054        });
055
056        if (componentReg != null) {
057            return componentReg;
058        }
059
060        try {
061            Object bean = context.getRegistry().lookupByName(".camelBlueprint.componentResolver." + name);
062            if (bean instanceof ComponentResolver) {
063                LOG.debug("Found component resolver: {} in registry: {}", name, bean);
064                return ((ComponentResolver) bean).resolveComponent(name, context);
065            }
066        } catch (Exception e) {
067            LOG.trace("Ignored error looking up bean: " + name + " due: " + e.getMessage(), e);
068        }
069        return getComponent(name, context);
070    }
071
072}