@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;
}