001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.coprocessor.example;
019
020import static org.junit.Assert.assertArrayEquals;
021import static org.junit.Assert.assertEquals;
022import static org.junit.Assert.assertNotNull;
023import static org.junit.Assert.assertNull;
024
025import java.io.IOException;
026import java.util.ArrayList;
027import java.util.List;
028import org.apache.hadoop.hbase.HBaseClassTestRule;
029import org.apache.hadoop.hbase.HBaseTestingUtil;
030import org.apache.hadoop.hbase.TableName;
031import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
032import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
033import org.apache.hadoop.hbase.client.Put;
034import org.apache.hadoop.hbase.client.Result;
035import org.apache.hadoop.hbase.client.ResultScanner;
036import org.apache.hadoop.hbase.client.Scan;
037import org.apache.hadoop.hbase.client.Table;
038import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
039import org.apache.hadoop.hbase.testclassification.CoprocessorTests;
040import org.apache.hadoop.hbase.testclassification.MediumTests;
041import org.apache.hadoop.hbase.util.Bytes;
042import org.junit.AfterClass;
043import org.junit.BeforeClass;
044import org.junit.ClassRule;
045import org.junit.Test;
046import org.junit.experimental.categories.Category;
047
048@Category({ CoprocessorTests.class, MediumTests.class })
049public class TestScanModifyingObserver {
050
051  @ClassRule
052  public static final HBaseClassTestRule CLASS_RULE =
053    HBaseClassTestRule.forClass(TestScanModifyingObserver.class);
054
055  private static final HBaseTestingUtil UTIL = new HBaseTestingUtil();
056  private static final TableName NAME = TableName.valueOf("TestScanModifications");
057  private static final byte[] FAMILY = Bytes.toBytes("f");
058  private static final ColumnFamilyDescriptor CFD =
059    ColumnFamilyDescriptorBuilder.newBuilder(FAMILY).build();
060  private static final int NUM_ROWS = 5;
061  private static final byte[] EXPLICIT_QUAL = Bytes.toBytes("our_qualifier");
062  private static final byte[] IMPLICIT_QUAL = Bytes.toBytes("their_qualifier");
063  private static final byte[] EXPLICIT_VAL = Bytes.toBytes("provided");
064  private static final byte[] IMPLICIT_VAL = Bytes.toBytes("implicit");
065
066  @BeforeClass
067  public static void setUp() throws Exception {
068    UTIL.startMiniCluster(1);
069    UTIL.getAdmin()
070      .createTable(TableDescriptorBuilder.newBuilder(NAME)
071        .setCoprocessor(ScanModifyingObserver.class.getName())
072        .setValue(ScanModifyingObserver.FAMILY_TO_ADD_KEY, Bytes.toString(FAMILY))
073        .setValue(ScanModifyingObserver.QUALIFIER_TO_ADD_KEY, Bytes.toString(IMPLICIT_QUAL))
074        .setColumnFamily(CFD).build());
075  }
076
077  @AfterClass
078  public static void tearDown() throws Exception {
079    UTIL.shutdownMiniCluster();
080  }
081
082  private void writeData(Table t) throws IOException {
083    List<Put> puts = new ArrayList<>(NUM_ROWS);
084    for (int i = 0; i < NUM_ROWS; i++) {
085      Put p = new Put(Bytes.toBytes(i + 1));
086      p.addColumn(FAMILY, EXPLICIT_QUAL, EXPLICIT_VAL);
087      p.addColumn(FAMILY, IMPLICIT_QUAL, IMPLICIT_VAL);
088      puts.add(p);
089    }
090    t.put(puts);
091  }
092
093  @Test
094  public void test() throws IOException {
095    try (Table t = UTIL.getConnection().getTable(NAME)) {
096      writeData(t);
097
098      Scan s = new Scan();
099      s.addColumn(FAMILY, EXPLICIT_QUAL);
100
101      try (ResultScanner scanner = t.getScanner(s)) {
102        for (int i = 0; i < NUM_ROWS; i++) {
103          Result result = scanner.next();
104          assertNotNull("The " + (i + 1) + "th result was unexpectedly null", result);
105          assertEquals(2, result.getFamilyMap(FAMILY).size());
106          assertArrayEquals(Bytes.toBytes(i + 1), result.getRow());
107          assertArrayEquals(EXPLICIT_VAL, result.getValue(FAMILY, EXPLICIT_QUAL));
108          assertArrayEquals(IMPLICIT_VAL, result.getValue(FAMILY, IMPLICIT_QUAL));
109        }
110        assertNull(scanner.next());
111      }
112    }
113  }
114}