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  import java.util.List;
25  import java.util.Map;
26  
27  import org.apache.hadoop.conf.Configuration;
28  import org.apache.hadoop.fs.Path;
29  import org.apache.hadoop.hbase.*;
30  import org.apache.hadoop.hbase.client.Put;
31  import org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost;
32  import org.apache.hadoop.hbase.regionserver.wal.WALEdit;
33  import org.apache.hadoop.hbase.regionserver.HRegion;
34  import org.apache.hadoop.hbase.util.Bytes;
35  
36  import junit.framework.TestCase;
37  import org.junit.experimental.categories.Category;
38  
39  @Category(SmallTests.class)
40  public class TestRegionObserverStacking extends TestCase {
41    static final String DIR = "test/build/data/TestRegionObserverStacking/";
42  
43    public static class ObserverA extends BaseRegionObserver {
44      long id;
45      @Override
46      public void postPut(final ObserverContext<RegionCoprocessorEnvironment> c,
47          final Put put, final WALEdit edit,
48          final boolean writeToWAL)
49          throws IOException {
50        id = System.currentTimeMillis();
51        try {
52          Thread.sleep(10);
53        } catch (InterruptedException ex) {
54        }
55      }
56    }
57  
58    public static class ObserverB extends BaseRegionObserver {
59      long id;
60      @Override
61      public void postPut(final ObserverContext<RegionCoprocessorEnvironment> c,
62          final Put put, final WALEdit edit,
63          final boolean writeToWAL)
64          throws IOException {
65        id = System.currentTimeMillis();
66        try {
67          Thread.sleep(10);
68        } catch (InterruptedException ex) {
69        }
70      }
71    }
72  
73    public static class ObserverC extends BaseRegionObserver {
74      long id;
75  
76      @Override
77      public void postPut(final ObserverContext<RegionCoprocessorEnvironment> c,
78          final Put put, final WALEdit edit,
79          final boolean writeToWAL)
80          throws IOException {
81        id = System.currentTimeMillis();
82        try {
83          Thread.sleep(10);
84        } catch (InterruptedException ex) {
85        }
86      }
87    }
88  
89    HRegion initHRegion (byte [] tableName, String callingMethod,
90        Configuration conf, byte [] ... families) throws IOException {
91      HTableDescriptor htd = new HTableDescriptor(tableName);
92      for(byte [] family : families) {
93        htd.addFamily(new HColumnDescriptor(family));
94      }
95      HRegionInfo info = new HRegionInfo(htd.getName(), null, null, false);
96      Path path = new Path(DIR + callingMethod);
97      HRegion r = HRegion.createHRegion(info, path, conf, htd);
98      // this following piece is a hack. currently a coprocessorHost
99      // is secretly loaded at OpenRegionHandler. we don't really
100     // start a region server here, so just manually create cphost
101     // and set it to region.
102     RegionCoprocessorHost host = new RegionCoprocessorHost(r, null, conf);
103     r.setCoprocessorHost(host);
104     return r;
105   }
106 
107   public void testRegionObserverStacking() throws Exception {
108     byte[] ROW = Bytes.toBytes("testRow");
109     byte[] TABLE = Bytes.toBytes(getClass().getName());
110     byte[] A = Bytes.toBytes("A");
111     byte[][] FAMILIES = new byte[][] { A } ;
112 
113     Configuration conf = HBaseConfiguration.create();
114     HRegion region = initHRegion(TABLE, getClass().getName(),
115       conf, FAMILIES);
116     RegionCoprocessorHost h = region.getCoprocessorHost();
117     h.load(ObserverA.class, Coprocessor.PRIORITY_HIGHEST, conf);
118     h.load(ObserverB.class, Coprocessor.PRIORITY_USER, conf);
119     h.load(ObserverC.class, Coprocessor.PRIORITY_LOWEST, conf);
120 
121     Put put = new Put(ROW);
122     put.add(A, A, A);
123     int lockid = region.obtainRowLock(ROW);
124     region.put(put, lockid);
125     region.releaseRowLock(lockid);
126 
127     Coprocessor c = h.findCoprocessor(ObserverA.class.getName());
128     long idA = ((ObserverA)c).id;
129     c = h.findCoprocessor(ObserverB.class.getName());
130     long idB = ((ObserverB)c).id;
131     c = h.findCoprocessor(ObserverC.class.getName());
132     long idC = ((ObserverC)c).id;
133 
134     assertTrue(idA < idB);
135     assertTrue(idB < idC);
136   }
137 
138   @org.junit.Rule
139   public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =
140     new org.apache.hadoop.hbase.ResourceCheckerJUnitRule();
141 }
142