/*
    * 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.giraph.zk;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.util.List;
  
  import org.apache.giraph.zk.ZooKeeperExt;
  import org.apache.zookeeper.CreateMode;
  import org.apache.zookeeper.KeeperException;
  import org.apache.zookeeper.WatchedEvent;
  import org.apache.zookeeper.Watcher;
  import org.apache.zookeeper.ZooDefs.Ids;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * Test the ZooKeeperExt class.
   */
  public class TestZooKeeperExt implements Watcher {
    /** ZooKeeperExt instance */
    private ZooKeeperExt zooKeeperExt = null;
    /** ZooKeeper server list */
    private String zkList = System.getProperty("prop.zookeeper.list");
  
    public static final String BASE_PATH = "/_zooKeeperExtTest";
    public static final String FIRST_PATH = "/_first";
  
    public void process(WatchedEvent event) {
      return;
    }
  
    @Before
    public void setUp() {
      try {
        if (zkList == null) {
          return;
        }
        zooKeeperExt =
            new ZooKeeperExt(zkList, 30 * 1000, 0, 0, this);
        zooKeeperExt.deleteExt(BASE_PATH, -1, true);
      } catch (KeeperException.NoNodeException e) {
        System.out.println("Clean start: No node " + BASE_PATH);
      } catch (Exception e) {
        throw new RuntimeException(e);
      }
    }
  
    @After
    public void tearDown() {
      if (zooKeeperExt == null) {
        return;
      }
      try {
        zooKeeperExt.close();
      } catch (InterruptedException e) {
        throw new RuntimeException(e);
      }
    }
  
    @Test
    public void testCreateExt() throws KeeperException, InterruptedException {
      if (zooKeeperExt == null) {
        System.out.println(
            "testCreateExt: No prop.zookeeper.list set, skipping test");
        return;
      }
      System.out.println("Created: " +
                             zooKeeperExt.createExt(
                                 BASE_PATH + FIRST_PATH,
                                 null,
                                 Ids.OPEN_ACL_UNSAFE,
                                 CreateMode.PERSISTENT,
                                 true));
      zooKeeperExt.deleteExt(BASE_PATH + FIRST_PATH, -1, false);
      zooKeeperExt.deleteExt(BASE_PATH, -1, false);
    }
  
    @Test
    public void testDeleteExt() throws KeeperException, InterruptedException {
     if (zooKeeperExt == null) {
       System.out.println(
           "testDeleteExt: No prop.zookeeper.list set, skipping test");
       return;
     }
     zooKeeperExt.createExt(BASE_PATH,
                            null,
                            Ids.OPEN_ACL_UNSAFE,
                            CreateMode.PERSISTENT,
                            false);
     zooKeeperExt.createExt(BASE_PATH + FIRST_PATH,
                            null,
                            Ids.OPEN_ACL_UNSAFE,
                            CreateMode.PERSISTENT,
                            false);
     try {
       zooKeeperExt.deleteExt(BASE_PATH, -1, false);
     } catch (KeeperException.NotEmptyException e) {
       System.out.println(
           "Correctly failed to delete since not recursive");
     }
     zooKeeperExt.deleteExt(BASE_PATH, -1, true);
   }
 
   @Test
   public void testGetChildrenExt()
       throws KeeperException, InterruptedException {
     if (zooKeeperExt == null) {
       System.out.println(
           "testGetChildrenExt: No prop.zookeeper.list set, skipping test");
       return;
     }
     zooKeeperExt.createExt(BASE_PATH,
                            null,
                            Ids.OPEN_ACL_UNSAFE,
                            CreateMode.PERSISTENT,
                            false);
     zooKeeperExt.createExt(BASE_PATH + "/b",
                            null,
                            Ids.OPEN_ACL_UNSAFE,
                            CreateMode.PERSISTENT_SEQUENTIAL,
                            false);
     zooKeeperExt.createExt(BASE_PATH + "/a",
                            null,
                            Ids.OPEN_ACL_UNSAFE,
                            CreateMode.PERSISTENT_SEQUENTIAL,
                            false);
     zooKeeperExt.createExt(BASE_PATH + "/d",
                            null,
                            Ids.OPEN_ACL_UNSAFE,
                            CreateMode.PERSISTENT_SEQUENTIAL,
                            false);
     zooKeeperExt.createExt(BASE_PATH + "/c",
                            null,
                            Ids.OPEN_ACL_UNSAFE,
                            CreateMode.PERSISTENT_SEQUENTIAL,
                            false);
     List<String> fullPathList =
         zooKeeperExt.getChildrenExt(BASE_PATH, false, false, true);
     for (String fullPath : fullPathList) {
       assertTrue(fullPath.contains(BASE_PATH + "/"));
     }
     List<String> sequenceOrderedList =
         zooKeeperExt.getChildrenExt(BASE_PATH, false, true, true);
     for (String fullPath : sequenceOrderedList) {
       assertTrue(fullPath.contains(BASE_PATH + "/"));
     }
     assertEquals(4, sequenceOrderedList.size());
     assertTrue(sequenceOrderedList.get(0).contains("/b"));
     assertTrue(sequenceOrderedList.get(1).contains("/a"));
     assertTrue(sequenceOrderedList.get(2).contains("/d"));
     assertTrue(sequenceOrderedList.get(3).contains("/c"));
   }
 }