1   /**
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.coprocessor;
22  
23  import java.io.IOException;
24  
25  import junit.framework.TestCase;
26  
27  import org.apache.hadoop.conf.Configuration;
28  import org.apache.hadoop.fs.Path;
29  import org.apache.hadoop.hbase.Coprocessor;
30  import org.apache.hadoop.hbase.HBaseConfiguration;
31  import org.apache.hadoop.hbase.HBaseTestingUtility;
32  import org.apache.hadoop.hbase.HColumnDescriptor;
33  import org.apache.hadoop.hbase.HRegionInfo;
34  import org.apache.hadoop.hbase.HTableDescriptor;
35  import org.apache.hadoop.hbase.SmallTests;
36  import org.apache.hadoop.hbase.client.Put;
37  import org.apache.hadoop.hbase.regionserver.HRegion;
38  import org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost;
39  import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
40  import org.apache.hadoop.hbase.util.Bytes;
41  import org.junit.experimental.categories.Category;
42  
43  @Category(SmallTests.class)
44  public class TestRegionObserverStacking extends TestCase {
45    private static HBaseTestingUtility TEST_UTIL
46      = new HBaseTestingUtility();
47    static final Path DIR = TEST_UTIL.getDataTestDir();
48  
49    public static class ObserverA extends BaseRegionObserver {
50      long id;
51      @Override
52      public void postPut(final ObserverContext<RegionCoprocessorEnvironment> c,
53          final Put put, final WALEdit edit,
54          final boolean writeToWAL)
55          throws IOException {
56        id = System.currentTimeMillis();
57        try {
58          Thread.sleep(10);
59        } catch (InterruptedException ex) {
60        }
61      }
62    }
63  
64    public static class ObserverB extends BaseRegionObserver {
65      long id;
66      @Override
67      public void postPut(final ObserverContext<RegionCoprocessorEnvironment> c,
68          final Put put, final WALEdit edit,
69          final boolean writeToWAL)
70          throws IOException {
71        id = System.currentTimeMillis();
72        try {
73          Thread.sleep(10);
74        } catch (InterruptedException ex) {
75        }
76      }
77    }
78  
79    public static class ObserverC extends BaseRegionObserver {
80      long id;
81  
82      @Override
83      public void postPut(final ObserverContext<RegionCoprocessorEnvironment> c,
84          final Put put, final WALEdit edit,
85          final boolean writeToWAL)
86          throws IOException {
87        id = System.currentTimeMillis();
88        try {
89          Thread.sleep(10);
90        } catch (InterruptedException ex) {
91        }
92      }
93    }
94  
95    HRegion initHRegion (byte [] tableName, String callingMethod,
96        Configuration conf, byte [] ... families) throws IOException {
97      HTableDescriptor htd = new HTableDescriptor(tableName);
98      for(byte [] family : families) {
99        htd.addFamily(new HColumnDescriptor(family));
100     }
101     HRegionInfo info = new HRegionInfo(htd.getName(), null, null, false);
102     Path path = new Path(DIR + callingMethod);
103     HRegion r = HRegion.createHRegion(info, path, conf, htd);
104     // this following piece is a hack. currently a coprocessorHost
105     // is secretly loaded at OpenRegionHandler. we don't really
106     // start a region server here, so just manually create cphost
107     // and set it to region.
108     RegionCoprocessorHost host = new RegionCoprocessorHost(r, null, conf);
109     r.setCoprocessorHost(host);
110     return r;
111   }
112 
113   public void testRegionObserverStacking() throws Exception {
114     byte[] ROW = Bytes.toBytes("testRow");
115     byte[] TABLE = Bytes.toBytes(getClass().getName());
116     byte[] A = Bytes.toBytes("A");
117     byte[][] FAMILIES = new byte[][] { A } ;
118 
119     Configuration conf = HBaseConfiguration.create();
120     HRegion region = initHRegion(TABLE, getClass().getName(),
121       conf, FAMILIES);
122     RegionCoprocessorHost h = region.getCoprocessorHost();
123     h.load(ObserverA.class, Coprocessor.PRIORITY_HIGHEST, conf);
124     h.load(ObserverB.class, Coprocessor.PRIORITY_USER, conf);
125     h.load(ObserverC.class, Coprocessor.PRIORITY_LOWEST, conf);
126 
127     Put put = new Put(ROW);
128     put.add(A, A, A);
129     int lockid = region.obtainRowLock(ROW);
130     region.put(put, lockid);
131     region.releaseRowLock(lockid);
132 
133     Coprocessor c = h.findCoprocessor(ObserverA.class.getName());
134     long idA = ((ObserverA)c).id;
135     c = h.findCoprocessor(ObserverB.class.getName());
136     long idB = ((ObserverB)c).id;
137     c = h.findCoprocessor(ObserverC.class.getName());
138     long idC = ((ObserverC)c).id;
139 
140     assertTrue(idA < idB);
141     assertTrue(idB < idC);
142   }
143 
144   @org.junit.Rule
145   public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =
146     new org.apache.hadoop.hbase.ResourceCheckerJUnitRule();
147 }
148