rabashizade commented on a change in pull request #1169:
URL: https://github.com/apache/helix/pull/1169#discussion_r463885621
##########
File path: helix-core/src/main/java/org/apache/helix/task/TaskStateModel.java
##########
@@ -283,6 +297,63 @@ public void reset() {
}
}
+ /**
+ * Loads className using classLoader
+ * @param classLoader
+ * @param className
+ * @return Class className loaded by classLoader
+ */
+ private Class loadClass(URLClassLoader classLoader, String className) {
+ try {
+ return classLoader.loadClass(className);
+ } catch (ClassNotFoundException e) {
+ LOG.error("Failed to load Task class " + className + " for new task in
instance " + _manager
+ .getInstanceName() + " in cluster " + _manager.getClusterName() +
".");
+ throw new IllegalStateException("Null TaskFactory for task");
+ }
+ }
+
+ /**
+ * Loads Task and TaskFactory classes for command input from
+ * a JAR file, and registers the TaskFactory in _taskFactoryRegistry.
+ * @param command The command indicating what task to be loaded
+ */
+ private void loadNewTask(String command) {
+ // Read ZNRecord containing task definition information.
+ ZNRecord taskConfig = _manager.getHelixDataAccessor().getBaseDataAccessor()
+ .get(TASK_PATH + "/" + command, null, 0);
Review comment:
Thank you for your comments, Junkai. So do you think something like this
at the beginning of the method would do?
```suggestion
// If the path for dynamic tasks doesn't exist, skip loading the task
if
(!_manager.getHelixDataAccessor().getBaseDataAccessor().exists(TaskConstants.TASK_PATH,
0)) {
return;
}
ZNRecord taskConfig =
_manager.getHelixDataAccessor().getBaseDataAccessor()
.get(TASK_PATH + "/" + command, null, 0);
```
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