hadoop-mapreduce/src/test/mapred/org/apache/hadoop/mapred/TestJobConf.java

/**
 * 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.hadoop.mapred;

import org.junit.Test;
import java.io.File;
import java.net.URLClassLoader;
import java.net.URL;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FileUtil;


import static org.junit.Assert.*;

public class TestJobConf {
  private static final String JAR_RELATIVE_PATH =
    "build/test/mapred/testjar/testjob.jar";
  private static final String CLASSNAME = "ClassWithNoPackage";

  private static String TEST_DIR_WITH_SPECIAL_CHARS =
    System.getProperty("test.build.data","/tmp") +
    File.separator + "test jobconf with + and spaces";

  @Test
  public void testFindContainingJar() throws Exception {
    testJarAtPath(JAR_RELATIVE_PATH);
  }

  /**
   * Test that findContainingJar works correctly even if the
   * path has a "+" sign or spaces in it
   */
  @Test
  public void testFindContainingJarWithPlus() throws Exception {
    new File(TEST_DIR_WITH_SPECIAL_CHARS).mkdirs();
    Configuration conf = new Configuration();

    FileSystem localfs = FileSystem.getLocal(conf);

    FileUtil.copy(localfs, new Path(JAR_RELATIVE_PATH),
                  localfs, new Path(TEST_DIR_WITH_SPECIAL_CHARS, "test.jar"),
                  false, true, conf);
    testJarAtPath(TEST_DIR_WITH_SPECIAL_CHARS + File.separator + "test.jar");
  }

  /**
   * Given a path with a jar, make a classloader with that jar on the
   * classpath, and check that findContainingJar can correctly
   * identify the path of the jar.
   */
  private void testJarAtPath(String path) throws Exception {
    File jar = new File(path).getAbsoluteFile();
    assertTrue(jar.exists());

    URL urls[] = new URL[] {
      jar.toURI().toURL()
    };

    ClassLoader cl = new URLClassLoader(urls);
    Class clazz = Class.forName(CLASSNAME, true, cl);
    assertNotNull(clazz);

    String containingJar = JobConf.findContainingJar(clazz);
    assertEquals(jar.getAbsolutePath(), containingJar);
  }
}