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The Core Camel Java DSL based router
/**
* 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.main;
import java.util.HashMap;
import java.util.Map;
import org.apache.camel.CamelContext;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.component.properties.PropertiesComponent;
import org.apache.camel.impl.CompositeRegistry;
import org.apache.camel.impl.DefaultCamelContext;
import org.apache.camel.impl.SimpleRegistry;
import org.apache.camel.spi.Registry;
/**
* A command line tool for booting up a CamelContext
*
* @version
*/
public class Main extends MainSupport {
protected static Main instance;
protected final SimpleRegistry registry = new SimpleRegistry();
public Main() {
}
public static void main(String... args) throws Exception {
Main main = new Main();
instance = main;
main.run(args);
System.exit(main.getExitCode());
}
/**
* Returns the currently executing main
*
* @return the current running instance
*/
public static Main getInstance() {
return instance;
}
/**
* Binds the given name
to the bean
object, so
* that it can be looked up inside the CamelContext this command line tool
* runs with.
*
* @param name the used name through which we do bind
* @param bean the object to bind
*/
public void bind(String name, Object bean) {
registry.put(name, bean);
}
/**
* Using the given name
does lookup for the bean being already
* bound using the {@link #bind(String, Object)} method.
*
* @see Registry#lookupByName(String)
*/
public Object lookup(String name) {
return registry.get(name);
}
/**
* Using the given name
and type
does lookup for
* the bean being already bound using the {@link #bind(String, Object)}
* method.
*
* @see Registry#lookupByNameAndType(String, Class)
*/
public T lookup(String name, Class type) {
return registry.lookupByNameAndType(name, type);
}
/**
* Using the given type
does lookup for the bean being already
* bound using the {@link #bind(String, Object)} method.
*
* @see Registry#findByTypeWithName(Class)
*/
public Map lookupByType(Class type) {
return registry.findByTypeWithName(type);
}
/**
*
* Gets or creates the {@link org.apache.camel.CamelContext} this main class is using.
*
* It just create a new CamelContextMap per call, please don't use it to access the camel context that will be ran by main.
* If you want to setup the CamelContext please use MainListener to get the new created camel context.
*/
public CamelContext getOrCreateCamelContext() {
// force init
Map map = getCamelContextMap();
if (map.size() >= 1) {
return map.values().iterator().next();
} else {
throw new IllegalStateException("Error creating CamelContext");
}
}
/**
* A list of locations to load properties. You can use comma to separate multiple locations.
* This option will override any default locations and only use the locations from this option.
*/
public void setPropertyPlaceholderLocations(String location) {
PropertiesComponent pc = new PropertiesComponent();
pc.setLocation(location);
bind("properties", pc);
}
// Implementation methods
// -------------------------------------------------------------------------
@Override
protected void doStart() throws Exception {
super.doStart();
postProcessContext();
if (getCamelContexts().size() > 0) {
try {
getCamelContexts().get(0).start();
// if we were veto started then mark as completed
} finally {
if (getCamelContexts().get(0).isVetoStarted()) {
completed();
}
}
}
}
protected void doStop() throws Exception {
super.doStop();
if (getCamelContexts().size() > 0) {
getCamelContexts().get(0).stop();
}
}
protected ProducerTemplate findOrCreateCamelTemplate() {
if (getCamelContexts().size() > 0) {
return getCamelContexts().get(0).createProducerTemplate();
} else {
return null;
}
}
protected Map getCamelContextMap() {
Map answer = new HashMap<>();
CamelContext camelContext = createContext();
if (registry.size() > 0) {
// set the registry through which we've already bound some beans
if (DefaultCamelContext.class.isAssignableFrom(camelContext.getClass())) {
CompositeRegistry compositeRegistry = new CompositeRegistry();
// make sure camel look up the Object from the registry first
compositeRegistry.addRegistry(registry);
// use the camel old registry as a fallback
compositeRegistry.addRegistry(((DefaultCamelContext) camelContext).getRegistry());
((DefaultCamelContext) camelContext).setRegistry(compositeRegistry);
}
}
answer.put("camel-1", camelContext);
return answer;
}
protected CamelContext createContext() {
return new DefaultCamelContext();
}
}