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/*
* 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.cdi;
import java.util.Map;
import java.util.Set;
import static java.util.function.Function.identity;
import static java.util.stream.Collectors.toMap;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import org.apache.camel.CamelContext;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.main.MainCommandLineSupport;
import org.apache.deltaspike.cdise.api.CdiContainer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.camel.cdi.AnyLiteral.ANY;
import static org.apache.camel.cdi.BeanManagerHelper.getReference;
import static org.apache.deltaspike.cdise.api.CdiContainerLoader.getCdiContainer;
/**
* Camel CDI boot integration. Allows Camel and CDI to be booted up on the command line as a JVM process.
* See http://camel.apache.org/camel-boot.html.
*/
@Vetoed
public class Main extends MainCommandLineSupport {
static {
// Since version 2.3.0.Final and WELD-1915, Weld SE registers a shutdown hook that conflicts
// with Camel main support. See WELD-2051. The system property above is available starting
// Weld 2.3.1.Final to deactivate the registration of the shutdown hook.
System.setProperty("org.jboss.weld.se.shutdownHook", String.valueOf(Boolean.FALSE));
}
private static final Logger LOG = LoggerFactory.getLogger(Main.class);
private static Main instance;
private CdiContainer cdiContainer;
public static void main(String... args) throws Exception {
Main main = new Main();
instance = main;
main.run(args);
}
/**
* Returns the currently executing instance.
*
* @return the current running instance
*/
public static Main getInstance() {
return instance;
}
@Override
protected ProducerTemplate findOrCreateCamelTemplate() {
if (getCamelContext() == null) {
throw new IllegalArgumentException("No CamelContext are available so cannot create a ProducerTemplate!");
}
return getCamelContext().createProducerTemplate();
}
@Override
protected CamelContext createCamelContext() {
BeanManager manager = cdiContainer.getBeanManager();
Map<String, CamelContext> camels = manager.getBeans(CamelContext.class, ANY).stream()
.map(bean -> getReference(manager, CamelContext.class, bean))
.collect(toMap(CamelContext::getName, identity()));
if (camels.size() > 1) {
throw new IllegalArgumentException("Multiple CamelContext detected. This Main class only supports single CamelContext");
} else if (camels.size() == 1) {
return camels.values().iterator().next();
}
return null;
}
@Override
protected void doStart() throws Exception {
// TODO: Use standard CDI Java SE support when CDI 2.0 becomes a prerequisite
CdiContainer container = getCdiContainer();
container.boot();
container.getContextControl().startContexts();
cdiContainer = container;
super.doStart();
initCamelContext();
warnIfNoCamelFound();
}
private void warnIfNoCamelFound() {
BeanManager manager = cdiContainer.getBeanManager();
Set<Bean<?>> contexts = manager.getBeans(CamelContext.class, ANY);
// Warn if there is no CDI Camel contexts
if (contexts.isEmpty()) {
LOG.warn("Camel CDI main has started with no Camel context!");
}
}
@Override
protected void doStop() throws Exception {
super.doStop();
if (cdiContainer != null) {
cdiContainer.shutdown();
}
}
}