hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestScriptBasedMapping.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.net;

import java.util.ArrayList;
import java.util.List;

import org.apache.hadoop.conf.Configuration;

import junit.framework.TestCase;
import org.junit.Test;

public class TestScriptBasedMapping extends TestCase {


  
  public TestScriptBasedMapping() {

  }

  @Test
  public void testNoArgsMeansNoResult() {
    Configuration conf = new Configuration();
    conf.setInt(ScriptBasedMapping.SCRIPT_ARG_COUNT_KEY,
                ScriptBasedMapping.MIN_ALLOWABLE_ARGS - 1);
    conf.set(ScriptBasedMapping.SCRIPT_FILENAME_KEY, "any-filename");
    conf.set(ScriptBasedMapping.SCRIPT_FILENAME_KEY, "any-filename");
    ScriptBasedMapping mapping = createMapping(conf);
    List<String> names = new ArrayList<String>();
    names.add("some.machine.name");
    names.add("other.machine.name");
    List<String> result = mapping.resolve(names);
    assertNull("Expected an empty list", result);
  }

  @Test
  public void testNoFilenameMeansSingleSwitch() throws Throwable {
    Configuration conf = new Configuration();
    ScriptBasedMapping mapping = createMapping(conf);
    assertTrue("Expected to be single switch", mapping.isSingleSwitch());
    assertTrue("Expected to be single switch",
               AbstractDNSToSwitchMapping.isMappingSingleSwitch(mapping));
  }

  @Test
  public void testFilenameMeansMultiSwitch() throws Throwable {
    Configuration conf = new Configuration();
    conf.set(ScriptBasedMapping.SCRIPT_FILENAME_KEY, "any-filename");
    ScriptBasedMapping mapping = createMapping(conf);
    assertFalse("Expected to be multi switch", mapping.isSingleSwitch());
    mapping.setConf(new Configuration());
    assertTrue("Expected to be single switch", mapping.isSingleSwitch());
  }

  @Test
  public void testNullConfig() throws Throwable {
    ScriptBasedMapping mapping = createMapping(null);
    assertTrue("Expected to be single switch", mapping.isSingleSwitch());

  }
  private ScriptBasedMapping createMapping(Configuration conf) {
    ScriptBasedMapping mapping = new ScriptBasedMapping();
    mapping.setConf(conf);
    return mapping;
  }
}