core/src/test/java/org/apache/hadoop/chukwa/datacollection/sender/TestRetryListOfCollectors.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.chukwa.datacollection.sender;


import junit.framework.TestCase;
import java.io.*;
import java.util.*;
import org.apache.hadoop.chukwa.datacollection.sender.RetryListOfCollectors;
import org.apache.hadoop.conf.Configuration;

public class TestRetryListOfCollectors extends TestCase {

  public void testRetryList() {
    List<String> hosts = new ArrayList<String>();
    hosts.add("host1");
    hosts.add("host2");
    hosts.add("host3");
    hosts.add("host4");
    Configuration conf = new Configuration();
    RetryListOfCollectors rloc = new RetryListOfCollectors(hosts, conf);
    rloc.shuffleList();
    assertEquals(hosts.size(), rloc.total());

    for (int i = 0; i < hosts.size(); ++i) {
      assertTrue(rloc.hasNext());
      String s = rloc.next();
      assertTrue(s != null);
      System.out.println(s);
    }

    if (rloc.hasNext()) {
      String s = rloc.next();
      System.out.println("saw unexpected collector " + s);
      fail();
    }
  }
  
  public void testCollectorsFile() {
    
    try {
    File tmpOutput = new File(System.getProperty("test.build.data", "/tmp"),
        "collectors_test");
    PrintWriter out = new PrintWriter(new FileOutputStream(tmpOutput));
    
    HashSet<String> validHosts = new HashSet<String>();
    validHosts.add("http://host1:5052/");
    validHosts.add("http://host2:5050/");
    validHosts.add("http://host3:5052/");
    validHosts.add("http://host4:5050/");
    validHosts.add("http://host5:5052/");
    validHosts.add("http://host6:5052/");
    
    out.println("host1");
    out.println("host2:5050");
    out.println("http://host3");
    out.println("http://host4:5050");
    out.println("http://host5:5052/");
    out.println("host6:5052");
    out.close();
    
    Configuration conf = new Configuration();
    conf.setInt("chukwaCollector.http.port", 5052);
    RetryListOfCollectors rloc = new RetryListOfCollectors(tmpOutput, conf);
    for (int i = 0; i < validHosts.size(); ++i) {
      assertTrue(rloc.hasNext());
      String s = rloc.next();
      assertTrue(s != null);
      
      System.out.println("host: " + s);
      assertTrue(validHosts.contains(s));
    }
    
    if (rloc.hasNext()) {
      String s = rloc.next();
      System.out.println("saw unexpected collector " + s);
      fail();
    }

    } catch(IOException e) {
      e.printStackTrace();
      fail();
    }
    
  }

}