/**
 * 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.hbase.io.encoding;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.hbase.HBaseClassTestRule;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HRegionLocation;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.RegionLocator;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.io.compress.Compression;
import org.apache.hadoop.hbase.io.hfile.CacheConfig;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.testclassification.IOTests;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.util.TestMiniClusterLoadSequential;
import org.apache.hadoop.hbase.util.Threads;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runners.Parameterized.Parameters;

/**
 * Uses the load tester
 */
@Category({ IOTests.class, MediumTests.class })
public class TestLoadAndSwitchEncodeOnDisk extends TestMiniClusterLoadSequential {

  @ClassRule
  public static final HBaseClassTestRule CLASS_RULE =
      HBaseClassTestRule.forClass(TestLoadAndSwitchEncodeOnDisk.class);

  /** We do not alternate the multi-put flag in this test. */
  private static final boolean USE_MULTI_PUT = true;

  /** Un-parameterize the test */
  @Parameters
  public static Collection<Object[]> parameters() {
    return Arrays.asList(new Object[][]{ new Object[0] });
  }

  public TestLoadAndSwitchEncodeOnDisk() {
    super(USE_MULTI_PUT, DataBlockEncoding.PREFIX);
    conf.setBoolean(CacheConfig.CACHE_BLOCKS_ON_WRITE_KEY, true);
  }

  @Override
  protected int numKeys() {
    return 3000;
  }

  @Override
  @Test
  public void loadTest() throws Exception {
    Admin admin = TEST_UTIL.getAdmin();

    compression = Compression.Algorithm.GZ; // used for table setup
    super.loadTest();

    HColumnDescriptor hcd = getColumnDesc(admin);
    System.err.println("\nDisabling encode-on-disk. Old column descriptor: " + hcd + "\n");
    Table t = TEST_UTIL.getConnection().getTable(TABLE);
    assertAllOnLine(t);

    admin.disableTable(TABLE);
    admin.modifyColumnFamily(TABLE, hcd);

    System.err.println("\nRe-enabling table\n");
    admin.enableTable(TABLE);

    System.err.println("\nNew column descriptor: " +
        getColumnDesc(admin) + "\n");

    // The table may not have all regions on line yet.  Assert online before
    // moving to major compact.
    assertAllOnLine(t);

    System.err.println("\nCompacting the table\n");
    admin.majorCompact(TABLE);
    // Wait until compaction completes
    Threads.sleepWithoutInterrupt(5000);
    HRegionServer rs = TEST_UTIL.getMiniHBaseCluster().getRegionServer(0);
    while (rs.compactSplitThread.getCompactionQueueSize() > 0) {
      Threads.sleep(50);
    }

    System.err.println("\nDone with the test, shutting down the cluster\n");
  }

  private void assertAllOnLine(final Table t) throws IOException {
    List<HRegionLocation> regions;
    try(RegionLocator rl = TEST_UTIL.getConnection().getRegionLocator(t.getName())) {
      regions = rl.getAllRegionLocations();
    }
    for (HRegionLocation e: regions) {
      byte [] startkey = e.getRegionInfo().getStartKey();
      Scan s = new Scan(startkey);
      ResultScanner scanner = t.getScanner(s);
      Result r = scanner.next();
      org.junit.Assert.assertTrue(r != null && r.size() > 0);
      scanner.close();
    }
  }
}
