Exemple #1
0
 @SuppressWarnings("unchecked")
 private static <K extends WritableComparable<?>, V extends Writable>
     Class<? extends SortedKeyValueIterator<K, V>> loadClass(
         boolean useAccumuloClassLoader, String context, IterInfo iterInfo)
         throws ClassNotFoundException, IOException {
   Class<? extends SortedKeyValueIterator<K, V>> clazz;
   if (useAccumuloClassLoader) {
     if (context != null && !context.equals("")) {
       clazz =
           (Class<? extends SortedKeyValueIterator<K, V>>)
               AccumuloVFSClassLoader.getContextManager()
                   .loadClass(context, iterInfo.className, SortedKeyValueIterator.class);
       log.trace(
           "Iterator class {} loaded from context {}, classloader: {}",
           iterInfo.className,
           context,
           clazz.getClassLoader());
     } else {
       clazz =
           (Class<? extends SortedKeyValueIterator<K, V>>)
               AccumuloVFSClassLoader.loadClass(iterInfo.className, SortedKeyValueIterator.class);
       log.trace(
           "Iterator class {} loaded from AccumuloVFSClassLoader: {}",
           iterInfo.className,
           clazz.getClassLoader());
     }
   } else {
     clazz =
         (Class<? extends SortedKeyValueIterator<K, V>>)
             Class.forName(iterInfo.className).asSubclass(SortedKeyValueIterator.class);
     log.trace("Iterator class {} loaded from classpath", iterInfo.className);
   }
   return clazz;
 }
  public <T> T instantiateClassProperty(Property property, Class<T> base, T defaultInstance) {
    String clazzName = get(property);
    T instance = null;

    try {
      Class<? extends T> clazz = AccumuloVFSClassLoader.loadClass(clazzName, base);
      instance = clazz.newInstance();
      log.info("Loaded class : " + clazzName);
    } catch (Exception e) {
      log.warn("Failed to load class ", e);
    }

    if (instance == null) {
      log.info("Using " + defaultInstance.getClass().getName());
      instance = defaultInstance;
    }
    return instance;
  }