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   *
   * 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.
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   */
  package org.apache.bookkeeper.statelib.impl.kv;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  
  import java.io.File;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.statelib.impl.rocksdb.checkpoint.CheckpointInfo;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  import org.junit.rules.TestName;
  
  
  
  
  /**
   * Test cases for Rocksdb KV Store with checkpoints.
   */
  @Slf4j
  public class TestRocksdbKVStoreCheckpoint {
  
      @Rule
      public final TestName runtime = new TestName();
      @Rule
      public final TemporaryFolder testDir = new TemporaryFolder();
  
      private TestStateStore store;
  
      @Before
      public void setUp() throws Exception {
          store = new TestStateStore(runtime, testDir);
          store.enableCheckpoints(true);
          store.init();
      }
  
      @After
      public void tearDown() throws Exception {
          if (null != store) {
              store.close();
          }
      }
  
      @Test
      public void testRestoreCorruptCheckpoint() throws Exception {
          int numKvs = 100;
  
          store.addNumKVs("transaction-1", numKvs, 0);
          String checkpoint1 = store.checkpoint("checkpoint-1");
          assertEquals("transaction-1", store.get("transaction-id"));
  
          store.addNumKVs("transaction-2", numKvs, 100);
          assertEquals("transaction-2", store.get("transaction-id"));
          String checkpoint2 = store.checkpoint("checkpoint-2");
  
          store.addNumKVs("transaction-3", numKvs, 200);
          assertEquals("transaction-3", store.get("transaction-id"));
  
          store.destroyLocal();
          store.restore();
          assertEquals("transaction-2", store.get("transaction-id"));
  
          // Ensure we can write to new store
          store.addNumKVs("transaction-4", numKvs, 300);
          assertEquals("transaction-4", store.get("transaction-id"));
  
          // corrupt the checkpoint-2 so restore fails
  
          CheckpointInfo cpi = store.getLatestCheckpoint();
          store.corruptCheckpoint(cpi);
          store.destroyLocal();
  
          // latest checkpoint is checkpoint-2, which has been corrupted.
          store.restore();
          // We should fallback to checkpoint-1
          assertEquals("transaction-1", store.get("transaction-id"));
      }
  
      @Test
      public void testLocalStoreCleanup() throws Exception {
          File checkpointDir = new File(store.getLocalDir(), "checkpoints");
  
          store.setRemoveLocal(true);
          store.setRemoveRemote(true);
          store.setLocalStorageCleanup(true);
  
          String[] checkpoints = checkpointDir.list();
          // Initially there is only one checkpoint directory that is used by the statestore
          assertEquals(1, checkpoints.length);
  
          store.restore();
  
          checkpoints = checkpointDir.list();
          // We should only have one checkpoint in the local directory.
          assertEquals(1, checkpoints.length);
  
          int numKvs = 100;
          for (int i = 0; i < 3; i++) {
              String txid = "txid-" + i;
              store.addNumKVs(txid, numKvs, i * numKvs);
              String checkpoint1 = store.checkpoint("checkpoint-1");
  
              checkpoints = checkpointDir.list();
              // Ensure the checkpoints are cleaned up
              assertEquals(1, checkpoints.length);
  
              store.restore();
              assertEquals(txid, store.get("transaction-id"));
  
              checkpoints = checkpointDir.list();
              // We should only have one checkpoint in the local directory.
              assertEquals(1, checkpoints.length);
          }
  
          store.close();
  
          checkpoints = checkpointDir.list();
          // We should not have any checkpoints af the store is closed.
          assertNull(checkpoints);
      }
  }
  