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.master.balancer;
019
020import java.io.IOException;
021import java.nio.charset.StandardCharsets;
022import java.nio.file.FileSystems;
023import java.nio.file.Files;
024import java.nio.file.NoSuchFileException;
025import java.nio.file.Path;
026import java.util.Collections;
027import java.util.List;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030
031final class HeterogeneousCostRulesTestHelper {
032
033  private static final Logger LOG = LoggerFactory.getLogger(HeterogeneousCostRulesTestHelper.class);
034
035  static final String DEFAULT_RULES_FILE_NAME = "hbase-balancer.rules";
036
037  private HeterogeneousCostRulesTestHelper() {
038  }
039
040  /**
041   * Create rule file with the given rules.
042   * @param file Name of file to write rules into.
043   * @return Full file name of the rules file which is <code>dir</code> + DEFAULT_RULES_FILE_NAME.
044   */
045  static String createRulesFile(String file, final List<String> rules) throws IOException {
046    cleanup(file);
047    Path path = Files.createFile(FileSystems.getDefault().getPath(file));
048    return Files.write(path, rules, StandardCharsets.UTF_8).toString();
049  }
050
051  /**
052   * Create rule file with empty rules.
053   * @param file Name of file to write rules into.
054   * @return Full file name of the rules file which is <code>dir</code> + DEFAULT_RULES_FILE_NAME.
055   */
056  static String createRulesFile(String file) throws IOException {
057    return createRulesFile(file, Collections.emptyList());
058  }
059
060  static void cleanup(String file) throws IOException {
061    try {
062      Files.delete(FileSystems.getDefault().getPath(file));
063    } catch (NoSuchFileException nsfe) {
064      LOG.warn("FileNotFoundException for {}", file, nsfe);
065    }
066  }
067}