Github user danny0405 commented on a diff in the pull request:
https://github.com/apache/storm/pull/2433#discussion_r158758374
--- Diff:
storm-client/src/jvm/org/apache/storm/assignments/LocalAssignmentsBackendFactory.java
---
@@ -0,0 +1,48 @@
+/**
+ * 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.storm.assignments;
+
+import com.google.common.base.Preconditions;
+import org.apache.storm.Config;
+import org.apache.storm.utils.ConfigUtils;
+import org.apache.storm.utils.ReflectionUtils;
+
+import java.util.Map;
+
+/**
+ * Factory class for creating local assignments.
+ */
+public class LocalAssignmentsBackendFactory {
+
+ public static ILocalAssignmentsBackend getBackend(Map<String, Object>
conf) {
+ if (conf.get(Config.NIMBUS_LOCAL_ASSIGNMENTS_BACKEND_CLASS) !=
null) {
+ Object targetObj = ReflectionUtils.newInstance((String)
conf.get(Config.NIMBUS_LOCAL_ASSIGNMENTS_BACKEND_CLASS));
+ Preconditions.checkState(targetObj instanceof
ILocalAssignmentsBackend, "{} must implements ILocalAssignmentsBackend",
Config.NIMBUS_LOCAL_ASSIGNMENTS_BACKEND_CLASS);
+ ((ILocalAssignmentsBackend)targetObj).prepare(conf);
+ return (ILocalAssignmentsBackend) targetObj;
+ }
+
+ return getDefault();
--- End diff --
then what if the Object is instanceof IStateStorage ? should i get the conf
from local yaml again?
---
