| /** |
| * 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.crunch.kafka.utils; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.net.ServerSocket; |
| import java.util.HashSet; |
| import java.util.Random; |
| import java.util.Set; |
| |
| /** |
| * Assorted Kafka testing utility methods. |
| */ |
| public class KafkaTestUtils { |
| |
| private static final Random RANDOM = new Random(); |
| private static final String TEMP_DIR_PREFIX = "kafka-"; |
| |
| private static final Set<Integer> USED_PORTS = new HashSet<Integer>(); |
| |
| /** |
| * Creates and returns a new randomly named temporary directory. It will be deleted upon JVM exit. |
| * |
| * @return a new temporary directory. |
| * |
| * @throws RuntimeException if a new temporary directory could not be created. |
| */ |
| public static File getTempDir() { |
| File file = new File(System.getProperty("java.io.tmpdir"), TEMP_DIR_PREFIX + RANDOM.nextInt(10000000)); |
| if (!file.mkdirs()) { |
| throw new RuntimeException("could not create temp directory: " + file.getAbsolutePath()); |
| } |
| file.deleteOnExit(); |
| return file; |
| } |
| |
| /** |
| * Returns an array containing the specified number of available local ports. |
| * |
| * @param count Number of local ports to identify and return. |
| * |
| * @return an array of available local port numbers. |
| * |
| * @throws RuntimeException if an I/O error occurs opening or closing a socket. |
| */ |
| public static int[] getPorts(int count) { |
| int[] ports = new int[count]; |
| Set<ServerSocket> openSockets = new HashSet<ServerSocket>(count + USED_PORTS.size()); |
| |
| for (int i = 0; i < count; ) { |
| try { |
| ServerSocket socket = new ServerSocket(0); |
| int port = socket.getLocalPort(); |
| openSockets.add(socket); |
| |
| // Disallow port reuse. |
| if (!USED_PORTS.contains(port)) { |
| ports[i++] = port; |
| USED_PORTS.add(port); |
| } |
| } catch (IOException e) { |
| throw new RuntimeException("could not open socket", e); |
| } |
| } |
| |
| // Close the sockets so that their port numbers can be used by the caller. |
| for (ServerSocket socket : openSockets) { |
| try { |
| socket.close(); |
| } catch (IOException e) { |
| throw new RuntimeException("could not close socket", e); |
| } |
| } |
| |
| return ports; |
| } |
| } |
| |