content: /*
   * 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.bookkeeper.statelib.impl.rocksdb.checkpoint.fs;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  import com.google.common.collect.Lists;
  import java.io.File;
  import java.io.OutputStream;
  import java.nio.file.NoSuchFileException;
  import java.util.Collections;
  import java.util.List;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  import org.junit.rules.TestName;
  
  /**
   * Unit test of {@link FSCheckpointManager}.
   */
  public class FSCheckpointManagerTest {
  
      private static final byte[] TEST_BYTES = "fs-checkpoint-manager".getBytes(UTF_8);
  
      @Rule
      public final TemporaryFolder testFolder = new TemporaryFolder();
      @Rule
      public final TestName runtime = new TestName();
  
      private File rootDir;
      private FSCheckpointManager cm;
  
      @Before
      public void setUp() throws Exception {
          this.rootDir = testFolder.newFolder("checkpoints");
          this.cm = new FSCheckpointManager(rootDir);
      }
  
      @Test
      public void testListFilesEmpty() throws Exception {
          new File(rootDir, runtime.getMethodName()).mkdir();
          assertTrue(cm.listFiles(runtime.getMethodName()).isEmpty());
      }
  
      @Test
      public void testListFilesNotFound() throws Exception {
          assertTrue(cm.listFiles(runtime.getMethodName()).isEmpty());
      }
  
      @Test
      public void testListFiles() throws Exception {
          int numFiles = 3;
          List<String> expectedFiles = Lists.newArrayListWithExpectedSize(3);
  
          File testDir = new File(rootDir, runtime.getMethodName());
          testDir.mkdir();
          for (int i = 0; i < numFiles; ++i) {
              String filename = runtime.getMethodName() + "-" + i;
              expectedFiles.add(filename);
              new File(testDir, filename).mkdir();
          }
          List<String> files = cm.listFiles(runtime.getMethodName());
          Collections.sort(files);
  
          assertEquals(expectedFiles, files);
      }
  
      @Test
      public void testFileExists() throws Exception {
          File testDir = new File(new File(rootDir, runtime.getMethodName()), "test");
          testDir.mkdirs();
          assertTrue(cm.fileExists(runtime.getMethodName() + "/test"));
          assertFalse(cm.fileExists(runtime.getMethodName() + "/test2"));
      }
  
      @Test
      public void testFileRename() throws Exception {
          File srcDir = new File(rootDir, "src");
          srcDir.mkdir();
          File destDir = new File(rootDir, "dest");
          destDir.mkdir();
  
          String srcFilePath = "src/" + runtime.getMethodName();
          String destFilePath = "dest/" + runtime.getMethodName();
          OutputStream os = cm.openOutputStream(srcFilePath);
          os.write(TEST_BYTES);
          os.flush();
          os.close();
  
          cm.rename(srcFilePath, destFilePath);
          assertTrue(cm.fileExists(destFilePath));
          assertFalse(cm.fileExists(srcFilePath));
      }
  
      @Test
      public void testFileRenameDirNotExists() throws Exception {
          File srcDir = new File(rootDir, "src");
          srcDir.mkdir();
  
          String srcFilePath = "src/" + runtime.getMethodName();
          String destFilePath = "dest/" + runtime.getMethodName();
          OutputStream os = cm.openOutputStream(srcFilePath);
          os.write(TEST_BYTES);
          os.flush();
          os.close();
  
          try {
              cm.rename(srcFilePath, destFilePath);
              fail("Should fail to rename if the dest dir doesn't exist");
          } catch (NoSuchFileException e) {
              // expected
          }
          assertFalse(cm.fileExists(destFilePath));
          assertTrue(cm.fileExists(srcFilePath));
      }
  
  }
  