| /* |
| * 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.sql; |
| |
| import java.util.List; |
| |
| import org.apache.calcite.DataContext; |
| import org.apache.storm.generated.StormTopology; |
| import org.apache.storm.sql.javac.CompilingClassLoader; |
| import org.apache.storm.streams.Stream; |
| import org.apache.storm.tuple.Values; |
| |
| public abstract class AbstractStreamsProcessor { |
| protected Stream<Values> outputStream; |
| protected DataContext dataContext; |
| protected List<CompilingClassLoader> classLoaders; |
| |
| /** |
| * Return final output stream of SQL topology structure. |
| * |
| * @return the output stream of the SQL |
| */ |
| public Stream<Values> outputStream() { |
| return outputStream; |
| } |
| |
| /** |
| * Construct the Storm topology based on the SQL. |
| */ |
| public abstract StormTopology build(); |
| |
| /** |
| * Return DataContext instance which is used with execution of query. |
| * |
| * @return DataContext instance which is used with execution of query |
| */ |
| public DataContext getDataContext() { |
| return dataContext; |
| } |
| |
| /** |
| * Return the list of Classloaders which need to be compiled and included to the jar. |
| * They're all chaining so the last classloader can access all classes. |
| * |
| * @return Classloaders to compile. |
| */ |
| public List<CompilingClassLoader> getClassLoaders() { |
| return classLoaders; |
| } |
| } |