| /* |
| * 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.flink.api.java; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.api.common.Plan; |
| |
| import static org.apache.flink.util.Preconditions.checkNotNull; |
| |
| /** A utility for extracting an execution plan (as JSON) from a {@link Plan}. */ |
| @Internal |
| public class ExecutionPlanUtil { |
| |
| private static final String PLAN_GENERATOR_CLASS_NAME = |
| "org.apache.flink.optimizer.plandump.ExecutionPlanJSONGenerator"; |
| |
| /** Extracts the execution plan (as JSON) from the given {@link Plan}. */ |
| public static String getExecutionPlanAsJSON(Plan plan) { |
| checkNotNull(plan); |
| ExecutionPlanJSONGenerator jsonGenerator = getJSONGenerator(); |
| return jsonGenerator.getExecutionPlan(plan); |
| } |
| |
| private static ExecutionPlanJSONGenerator getJSONGenerator() { |
| Class<? extends ExecutionPlanJSONGenerator> planGeneratorClass = |
| loadJSONGeneratorClass(PLAN_GENERATOR_CLASS_NAME); |
| |
| try { |
| return planGeneratorClass.getConstructor().newInstance(); |
| } catch (Throwable t) { |
| throw new RuntimeException( |
| "An error occurred while loading the plan generator (" |
| + PLAN_GENERATOR_CLASS_NAME |
| + ").", |
| t); |
| } |
| } |
| |
| private static Class<? extends ExecutionPlanJSONGenerator> loadJSONGeneratorClass( |
| String className) { |
| try { |
| Class<?> generatorClass = Class.forName(className); |
| return generatorClass.asSubclass(ExecutionPlanJSONGenerator.class); |
| } catch (ClassNotFoundException cnfe) { |
| throw new RuntimeException( |
| "Could not load the plan generator class (" |
| + className |
| + "). Do you have the 'flink-optimizer' project in your dependencies?"); |
| } catch (Throwable t) { |
| throw new RuntimeException( |
| "An error occurred while loading the plan generator (" + className + ").", t); |
| } |
| } |
| |
| /** |
| * Internal interface for the JSON plan generator that has to reside in the optimizer package. |
| * We load the actual subclass using reflection. |
| */ |
| @Internal |
| public interface ExecutionPlanJSONGenerator { |
| |
| /** Returns the execution plan as a JSON string. */ |
| String getExecutionPlan(Plan plan); |
| } |
| } |