DefaultConnectionProperties.java

/*
 * 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.artemis.jms.client;

import java.security.AccessController;
import java.security.PrivilegedAction;

/**
 * <p>This class will provide default properties for constructors</p>
 *
 * <table border='1' summary=''>
 * <tr> <td>Name</td> <td>Default Value</td></tr>
 * <tr> <td>AMQ_HOST or org.apache.activemq.AMQ_HOST</td> <td>localhost</td></tr>
 * <tr><td>AMQ_PORT or org.apache.activemq.AMQ_PORT</td> <td>61616</td></tr>
 * <tr><td>BROKER_BIND_URL or org.apache.activemq.BROKER_BIND_URL</td> <td>tcp://${AMQ_HOST}:${AMQ_PORT}</td></tr>
 * <tr><td>AMQ_USER or org.apache.activemq.AMQ_USER</td> <td>null</td></tr>
 * <tr><td>AMQ_PASSWORD or org.apache.activemq.AMQ_PASSWORD</td> <td>null</td></tr>
 * </table>
 */
public class DefaultConnectionProperties {

   public static final String DEFAULT_BROKER_HOST;
   public static final int DEFAULT_BROKER_PORT;
   public static final String DEFAULT_BROKER_BIND_URL;
   public static final String DEFAULT_BROKER_URL;
   public static final String DEFAULT_USER;
   public static final String DEFAULT_PASSWORD;

   static String getProperty(final String defaultValue, final String... propertyNames) {
      return AccessController.doPrivileged(new PrivilegedAction<String>() {
         @Override
         public String run() {
            for (String name : propertyNames) {
               String property = System.getProperty(name);
               if (property != null && !property.isEmpty()) {
                  return property;
               }
            }
            return defaultValue;
         }
      });
   }

   static {
      String host = getProperty("localhost", "AMQ_HOST", "org.apache.activemq.AMQ_HOST");
      String port = getProperty("61616", "AMQ_PORT", "org.apache.activemq.AMQ_PORT");
      DEFAULT_BROKER_HOST = host;
      DEFAULT_BROKER_PORT = Integer.parseInt(port);
      String url = getProperty("tcp://" + host + ":" + port, "org.apache.activemq.BROKER_BIND_URL", "BROKER_BIND_URL");
      DEFAULT_USER = getProperty(null, "AMQ_USER", "org.apache.activemq.AMQ_USER");
      DEFAULT_PASSWORD = getProperty(null, "AMQ_PASSWORD", "org.apache.activemq.AMQ_PASSWORD");

      if (DEFAULT_USER != null && DEFAULT_PASSWORD != null) {
         url += "?user=" + DEFAULT_USER + "&password=" + DEFAULT_PASSWORD;
      }

      DEFAULT_BROKER_BIND_URL = url;
      // TODO: improve this once we implement failover:// as ActiveMQ5 does
      DEFAULT_BROKER_URL = DEFAULT_BROKER_BIND_URL;
   }

}