| /* |
| * 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.drill.test; |
| |
| import ch.qos.logback.classic.Level; |
| |
| import org.apache.drill.common.util.function.CheckedSupplier; |
| import org.apache.drill.exec.client.LoggingResultsListener; |
| import org.apache.drill.exec.util.VectorUtil; |
| |
| import java.util.function.Supplier; |
| |
| /** |
| * <p> |
| * This class contains utility methods to run lambda functions with the necessary {@link org.apache.drill.test.LogFixture} |
| * boilerplate to print results to stdout for debugging purposes. |
| * </p> |
| * |
| * <p> |
| * If you need to enable printing for more classes, simply add them to the {@link org.apache.drill.test.LogFixture} |
| * constructed in {@link #printAndThrow(CheckedSupplier)}. |
| * </p> |
| */ |
| public final class PrintingUtils { |
| |
| /** |
| * Enables printing to stdout for lambda functions that do not throw exceptions. |
| * @param supplier Lambda function to execute. |
| * @param <T> The return type of the lambda function. |
| * @return Data produced by the lambda function. |
| */ |
| public static <T> T print(Supplier<T> supplier) { |
| return printAndThrow(supplier::get); |
| } |
| |
| /** |
| * Enables printing to stdout for lambda functions that throw an exception. |
| * @param supplier Lambda function to execute. |
| * @param <T> Return type of the lambda function. |
| * @param <E> Type of exception thrown. |
| * @return Data produced by the lambda function. |
| * @throws E An exception. |
| */ |
| public static <T, E extends Exception> T printAndThrow(CheckedSupplier<T, E> supplier) throws E { |
| try(LogFixture logFixture = new LogFixture.LogFixtureBuilder() |
| .rootLogger(Level.OFF) |
| // For some reason rootLogger(Level.OFF) is not sufficient. |
| .logger("org.apache.drill", Level.OFF) // Disable logging for Drill class we don't want |
| .logger(VectorUtil.class, Level.INFO) |
| .logger(LoggingResultsListener.class, Level.INFO) |
| .toConsole() // This redirects output to stdout |
| .build()) { |
| return supplier.get(); |
| } |
| } |
| } |