/**
 * 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.hdfs.server.datanode.fsdataset.impl;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
import org.apache.hadoop.test.GenericTestUtils;
import org.junit.Test;

import java.io.IOException;

import static org.hamcrest.core.Is.is;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.assertThat;


public class TestLazyPersistPolicy extends LazyPersistTestCase {
  @Test
  public void testPolicyNotSetByDefault() throws IOException {
    getClusterBuilder().build();
    final String METHOD_NAME = GenericTestUtils.getMethodName();
    Path path = new Path("/" + METHOD_NAME + ".dat");

    makeTestFile(path, 0, false);
    // Stat the file and check that the LAZY_PERSIST policy is not
    // returned back.
    HdfsFileStatus status = client.getFileInfo(path.toString());
    assertThat(status.getStoragePolicy(), not(LAZY_PERSIST_POLICY_ID));
  }

  @Test
  public void testPolicyPropagation() throws IOException {
    getClusterBuilder().build();
    final String METHOD_NAME = GenericTestUtils.getMethodName();
    Path path = new Path("/" + METHOD_NAME + ".dat");

    makeTestFile(path, 0, true);
    // Stat the file and check that the lazyPersist flag is returned back.
    HdfsFileStatus status = client.getFileInfo(path.toString());
    assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
  }

  @Test
  public void testPolicyPersistenceInEditLog() throws IOException {
    getClusterBuilder().build();
    final String METHOD_NAME = GenericTestUtils.getMethodName();
    Path path = new Path("/" + METHOD_NAME + ".dat");

    makeTestFile(path, 0, true);
    cluster.restartNameNode(true);

    // Stat the file and check that the lazyPersist flag is returned back.
    HdfsFileStatus status = client.getFileInfo(path.toString());
    assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
  }

  @Test
  public void testPolicyPersistenceInFsImage() throws IOException {
    getClusterBuilder().build();
    final String METHOD_NAME = GenericTestUtils.getMethodName();
    Path path = new Path("/" + METHOD_NAME + ".dat");

    makeTestFile(path, 0, true);
    // checkpoint
    fs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_ENTER);
    fs.saveNamespace();
    fs.setSafeMode(HdfsConstants.SafeModeAction.SAFEMODE_LEAVE);
    cluster.restartNameNode(true);

    // Stat the file and check that the lazyPersist flag is returned back.
    HdfsFileStatus status = client.getFileInfo(path.toString());
    assertThat(status.getStoragePolicy(), is(LAZY_PERSIST_POLICY_ID));
  }
}