| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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.impala.hooks; |
| |
| import java.util.Objects; |
| |
| /** |
| * {@link QueryCompleteContext} encapsulates immutable information sent from the |
| * BE to a post-query hook. |
| */ |
| public class QueryCompleteContext { |
| private final String lineageGraph_; |
| |
| public QueryCompleteContext(String lineageGraph) { |
| lineageGraph_ = Objects.requireNonNull(lineageGraph); |
| } |
| |
| /** |
| * Returns the lineage graph sent from the backend during |
| * {@link QueryEventHook#onQueryComplete(QueryCompleteContext)}. This graph |
| * object will generally contain more information than it did when it was |
| * first constructed in the frontend, because the backend will have filled |
| * in additional information. |
| * <p> |
| * The returned object is a JSON representation of the lineage graph object |
| * for the query. The details of the JSON translation are not provided here |
| * as this is meant to be a temporary feature, and the String format will |
| * be changed to something more strongly-typed in the future. |
| * </p> |
| * |
| * @return lineage graph from the query that executed |
| */ |
| public String getLineageGraph() { return lineageGraph_; } |
| |
| @Override |
| public String toString() { |
| return "QueryCompleteContext{" + |
| "lineageGraph='" + lineageGraph_ + '\'' + |
| '}'; |
| } |
| } |