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The ActiveMQ Message Broker and Client implementations
/**
* 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.activemq.broker;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.util.Map;
import java.util.Properties;
import org.apache.activemq.util.IntrospectionSupport;
/**
* A {@link BrokerFactoryHandler} which uses a properties file to configure the
* broker's various policies.
*
* @version $Revision: 564057 $
*/
public class PropertiesBrokerFactory implements BrokerFactoryHandler {
public BrokerService createBroker(URI brokerURI) throws Exception {
Map properties = loadProperties(brokerURI);
BrokerService brokerService = createBrokerService(brokerURI, properties);
IntrospectionSupport.setProperties(brokerService, properties);
return brokerService;
}
/**
* Lets load the properties from some external URL or a relative file
*/
protected Map loadProperties(URI brokerURI) throws IOException {
// lets load a URI
String remaining = brokerURI.getSchemeSpecificPart();
Properties properties = new Properties();
File file = new File(remaining);
InputStream inputStream = null;
if (file.exists()) {
inputStream = new FileInputStream(file);
} else {
URL url = null;
try {
url = new URL(remaining);
} catch (MalformedURLException e) {
// lets now see if we can find the name on the classpath
inputStream = findResourceOnClassPath(remaining);
if (inputStream == null) {
throw new IOException("File does not exist: " + remaining + ", could not be found on the classpath and is not a valid URL: " + e);
}
}
if (inputStream == null && url != null) {
inputStream = url.openStream();
}
}
if (inputStream != null) {
properties.load(inputStream);
inputStream.close();
}
// should we append any system properties?
try {
Properties systemProperties = System.getProperties();
properties.putAll(systemProperties);
} catch (Exception e) {
// ignore security exception
}
return properties;
}
protected InputStream findResourceOnClassPath(String remaining) {
InputStream answer = Thread.currentThread().getContextClassLoader().getResourceAsStream(remaining);
if (answer == null) {
answer = getClass().getClassLoader().getResourceAsStream(remaining);
}
return answer;
}
protected BrokerService createBrokerService(URI brokerURI, Map properties) {
return new BrokerService();
}
}