org.apache.camel.impl.engine.HeadersMapFactoryResolver Maven / Gradle / Ivy
/*
* 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.impl.engine;
import java.io.IOException;
import org.apache.camel.CamelContext;
import org.apache.camel.ExtendedCamelContext;
import org.apache.camel.spi.FactoryFinder;
import org.apache.camel.spi.HeadersMapFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Factory to create the {@link HeadersMapFactory} implementation to be used.
*
* @see HeadersMapFactory
*/
public class HeadersMapFactoryResolver {
public static final String RESOURCE_PATH = "META-INF/services/org/apache/camel/";
private static final Logger LOG = LoggerFactory.getLogger(HeadersMapFactoryResolver.class);
private FactoryFinder factoryFinder;
public HeadersMapFactory resolve(CamelContext context) {
// use factory finder to find a custom implementations
Class> type = null;
try {
type = findFactory("headers-map-factory", context);
} catch (Exception e) {
// ignore
}
if (type != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("Found HeadersMapFactory: {} via: {}{}", type.getName(), factoryFinder.getResourcePath(), "headers-map-factory");
}
if (HeadersMapFactory.class.isAssignableFrom(type)) {
HeadersMapFactory answer = (HeadersMapFactory) context.getInjector().newInstance(type, false);
LOG.info("Detected and using custom HeadersMapFactory: {}", answer);
return answer;
} else {
throw new IllegalArgumentException("Type is not a HeadersMapFactory implementation. Found: " + type.getName());
}
}
// fallback to default
LOG.debug("Creating default HeadersMapFactory");
return new DefaultHeadersMapFactory();
}
private Class> findFactory(String name, CamelContext context) throws IOException {
if (factoryFinder == null) {
factoryFinder = context.adapt(ExtendedCamelContext.class).getFactoryFinder(RESOURCE_PATH);
}
return factoryFinder.findClass(name).orElse(null);
}
}
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