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.util.ResolverHelper;
024import org.osgi.framework.BundleContext;
025import org.osgi.service.blueprint.container.NoSuchComponentException;
026import org.slf4j.Logger;
027import org.slf4j.LoggerFactory;
028
029import static org.apache.camel.util.ObjectHelper.getException;
030
031public class BlueprintComponentResolver extends OsgiComponentResolver {
032
033    private static final Logger LOG = LoggerFactory.getLogger(BlueprintComponentResolver.class);
034
035    public BlueprintComponentResolver(BundleContext bundleContext) {
036        super(bundleContext);
037    }
038
039    @Override
040    public Component resolveComponent(String name, CamelContext context) throws Exception {
041
042        Component componentReg = ResolverHelper.lookupComponentInRegistryWithFallback(context, name, new ResolverHelper.LookupExceptionHandler() {
043            @Override
044            public void handleException(Exception e, Logger log, String name) {
045                if (getException(NoSuchComponentException.class, e) != null) {
046                    // if the caused error is NoSuchComponentException then that can be expected so ignore
047                } else {
048                    LOG.trace("Ignored error looking up bean: " + name + " due: " + e.getMessage(), e);
049                }
050            }
051        });
052
053        if (componentReg != null) {
054            return componentReg;
055        }
056
057        try {
058            Object bean = context.getRegistry().lookupByName(".camelBlueprint.componentResolver." + name);
059            if (bean instanceof ComponentResolver) {
060                LOG.debug("Found component resolver: {} in registry: {}", name, bean);
061                return ((ComponentResolver) bean).resolveComponent(name, context);
062            }
063        } catch (Exception e) {
064            LOG.trace("Ignored error looking up bean: " + name + " due: " + e.getMessage(), e);
065        }
066        return getComponent(name, context);
067    }
068
069}