Github user revans2 commented on a diff in the pull request: https://github.com/apache/storm/pull/2433#discussion_r173211013 --- Diff: storm-client/src/jvm/org/apache/storm/assignments/ILocalAssignmentsBackend.java --- @@ -0,0 +1,113 @@ +/** + * 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 java.util.List; +import java.util.Map; + +import org.apache.storm.generated.Assignment; + +/** + * Interface for storing local assignments. + */ +public interface ILocalAssignmentsBackend { + /** + * Decide if the assignments is synchronized from remote state-store. + */ + boolean isSynchronized(); + + /** + * Mark this backend as synchronized when sync work is done. + */ + void setSynchronized(); + + /** + * Initial function for creating backend. + * @param conf config + */ + void prepare(Map conf); + + /** + * Keep a storm assignment to local state or update old assignment. + * @param stormID storm runtime id + * @param assignment assignment as thrift + */ + void keepOrUpdateAssignment(String stormID, Assignment assignment); + + /** + * Get assignment as {@link Assignment} for a storm. + * @param stormId storm runtime id + * @return assignment + */ + Assignment getAssignment(String stormId); + + void removeAssignment(String stormId); + + /** + * List all the storm runtime ids of local assignments. + * @return a list of storm ids + */ + List<String> assignments(); + + /** + * Get all the local assignments of local state. + * @return mapping of storm-id -> assignment + */ + Map<String, Assignment> assignmentsInfo(); + + /** + * Sync remote assignments to local, if remote is null, we will sync it from zk. + * @param remote specific remote assignments, if it is null, it will sync from zookeeper[only used for nimbus] + */ + void syncRemoteAssignments(Map<String, byte[]> remote); + + /** + * Keep a mapping storm-name -> storm-id to local state. + * @param stormName storm name + * @param stormId storm runtime id + */ + void keepStormId(String stormName, String stormId); + + /** + * Get storm runtime id from local. + * @param stormName name of a storm + * @return runtime storm id + */ + String getStormId(String stormName); + + /** + * Sync remote storm ids to local, will just used for nimbus. + * @param remote remote ids from state store + */ + void syncRemoteIds(Map<String, String> remote); + + void deleteStormId(String stormName); + + /** + * Clear all the state for a storm. + * @param stormId storm id + */ + void clearStateForStorm(String stormId); + + /** + * Function to release resource. + */ + void dispose(); --- End diff -- nit: Can we just make this extend AutoClosable instead?
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