content: /**
   * 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.tool.spi;
  
  import java.io.File;
  import java.net.URL;
  import java.net.URLClassLoader;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Properties;
  import java.util.StringTokenizer;
  
  import jakarta.jms.ConnectionFactory;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public abstract class ClassLoaderSPIConnectionFactory implements SPIConnectionFactory {
  
      public static final String KEY_EXT_DIR = "extDir";
      private static final Logger LOG = LoggerFactory.getLogger(ClassLoaderSPIConnectionFactory.class);
  
      public final ConnectionFactory createConnectionFactory(Properties settings) throws Exception {
  
          // Load new context class loader
          ClassLoader newClassLoader = getContextClassLoader(settings);
          Thread.currentThread().setContextClassLoader(newClassLoader);
  
          return instantiateConnectionFactory(settings);
      }
  
      protected ClassLoader getContextClassLoader(Properties settings) {
          String extDir = (String)settings.remove(KEY_EXT_DIR);
          if (extDir != null) {
              StringTokenizer tokens = new StringTokenizer(extDir, ";,");
              List<URL> urls = new ArrayList<URL>();
              while (tokens.hasMoreTokens()) {
                  String dir = tokens.nextToken();
                  try {
                      File f = new File(dir);
                      if (!f.exists()) {
                          LOG.warn("Cannot find extension dir: " + f.getAbsolutePath());
                      } else {
                          LOG.info("Adding extension dir: " + f.getAbsolutePath());
  
                          urls.add(f.toURI().toURL());
  
                          File[] files = f.listFiles();
                          if (files != null) {
                              for (int j = 0; j < files.length; j++) {
                                  if (files[j].getName().endsWith(".zip") || files[j].getName().endsWith(".jar")) {
                                      LOG.info("Adding extension dir: " + files[j].getAbsolutePath());
                                      urls.add(files[j].toURI().toURL());
                                  }
                              }
                          }
                      }
                  } catch (Exception e) {
                      LOG.warn("Failed to load ext dir: " + dir + ". Reason: " + e);
                  }
              }
  
              URL u[] = new URL[urls.size()];
              urls.toArray(u);
              return new URLClassLoader(u, Thread.currentThread().getContextClassLoader());
          }
          return ClassLoaderSPIConnectionFactory.class.getClassLoader();
      }
  
      protected abstract ConnectionFactory instantiateConnectionFactory(Properties settings) throws Exception;
  }
  