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.main;
018
019import java.util.HashMap;
020import java.util.Map;
021import javax.xml.bind.JAXBException;
022
023import org.apache.camel.CamelContext;
024import org.apache.camel.ProducerTemplate;
025import org.apache.camel.impl.CompositeRegistry;
026import org.apache.camel.impl.DefaultCamelContext;
027import org.apache.camel.impl.SimpleRegistry;
028import org.apache.camel.spi.Registry;
029import org.apache.camel.view.ModelFileGenerator;
030
031/**
032 * A command line tool for booting up a CamelContext
033 *
034 * @version 
035 */
036public class Main extends MainSupport {
037
038    protected static Main instance;
039    protected final SimpleRegistry registry = new SimpleRegistry();
040
041    public Main() {
042    }
043
044    public static void main(String... args) throws Exception {
045        Main main = new Main();
046        instance = main;
047        main.enableHangupSupport();
048        main.run(args);
049    }
050
051    /**
052     * Returns the currently executing main
053     *
054     * @return the current running instance
055     */
056    public static Main getInstance() {
057        return instance;
058    }
059
060    /**
061     * Binds the given <code>name</code> to the <code>bean</code> object, so
062     * that it can be looked up inside the CamelContext this command line tool
063     * runs with.
064     * 
065     * @param name the used name through which we do bind
066     * @param bean the object to bind
067     */
068    public void bind(String name, Object bean) {
069        registry.put(name, bean);
070    }
071
072    /**
073     * Using the given <code>name</code> does lookup for the bean being already
074     * bound using the {@link #bind(String, Object)} method.
075     * 
076     * @see Registry#lookupByName(String)
077     */
078    public Object lookup(String name) {
079        return registry.get(name);
080    }
081
082    /**
083     * Using the given <code>name</code> and <code>type</code> does lookup for
084     * the bean being already bound using the {@link #bind(String, Object)}
085     * method.
086     * 
087     * @see Registry#lookupByNameAndType(String, Class)
088     */
089    public <T> T lookup(String name, Class<T> type) {
090        return registry.lookupByNameAndType(name, type);
091    }
092
093    /**
094     * Using the given <code>type</code> does lookup for the bean being already
095     * bound using the {@link #bind(String, Object)} method.
096     * 
097     * @see Registry#findByTypeWithName(Class)
098     */
099    public <T> Map<String, T> lookupByType(Class<T> type) {
100        return registry.findByTypeWithName(type);
101    }
102
103    /**
104     * Gets or creates the {@link org.apache.camel.CamelContext} this main class is using.
105     */
106    public CamelContext getOrCreateCamelContext() {
107        // force init
108        Map<String, CamelContext> map = getCamelContextMap();
109        if (map.size() >= 1) {
110            return map.values().iterator().next();
111        } else {
112            throw new IllegalStateException("Error creating CamelContext");
113        }
114    }
115    
116    // Implementation methods
117    // -------------------------------------------------------------------------
118
119    @Override
120    protected void doStart() throws Exception {
121        super.doStart();
122        postProcessContext();
123        if (getCamelContexts().size() > 0) {
124            getCamelContexts().get(0).start();
125        }
126    }
127
128    protected void doStop() throws Exception {
129        super.doStop();
130        if (getCamelContexts().size() > 0) {
131            getCamelContexts().get(0).stop();
132        }
133    }
134
135    protected ProducerTemplate findOrCreateCamelTemplate() {
136        if (getCamelContexts().size() > 0) {
137            return getCamelContexts().get(0).createProducerTemplate();
138        } else {
139            return null;
140        }
141    }
142
143    protected Map<String, CamelContext> getCamelContextMap() {
144        Map<String, CamelContext> answer = new HashMap<String, CamelContext>();
145
146        CamelContext camelContext = createContext();
147        if (registry.size() > 0) {
148            // set the registry through which we've already bound some beans
149            if (DefaultCamelContext.class.isAssignableFrom(camelContext.getClass())) {
150                CompositeRegistry compositeRegistry = new CompositeRegistry();
151                // make sure camel look up the Object from the registry first
152                compositeRegistry.addRegistry(registry);
153                // use the camel old registry as a fallback
154                compositeRegistry.addRegistry(((DefaultCamelContext) camelContext).getRegistry());
155                ((DefaultCamelContext) camelContext).setRegistry(compositeRegistry);
156            }
157        }
158
159        answer.put("camel-1", camelContext);
160        return answer;
161    }
162
163    protected CamelContext createContext() {
164        return new DefaultCamelContext();
165    }
166
167    protected ModelFileGenerator createModelFileGenerator() throws JAXBException {
168        return null;
169    }
170}