1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.hbase.master.cleaner;
19
20 import org.apache.hadoop.fs.FileStatus;
21 import org.apache.hadoop.hbase.BaseConfigurable;
22
23 import com.google.common.base.Predicate;
24 import com.google.common.collect.Iterables;
25
26 import java.util.Map;
27
28 /**
29 * Base class for file cleaners which allows subclasses to implement a simple
30 * isFileDeletable method (which used to be the FileCleanerDelegate contract).
31 */
32 public abstract class BaseFileCleanerDelegate extends BaseConfigurable
33 implements FileCleanerDelegate {
34
35 @Override
36 public Iterable<FileStatus> getDeletableFiles(Iterable<FileStatus> files) {
37 return Iterables.filter(files, new Predicate<FileStatus>() {
38 @Override
39 public boolean apply(FileStatus file) {
40 return isFileDeletable(file);
41 }});
42 }
43
44 @Override
45 public void init(Map<String, Object> params) {
46 // subclass could override it if needed.
47 }
48
49 /**
50 * Should the master delete the file or keep it?
51 * @param fStat file status of the file to check
52 * @return <tt>true</tt> if the file is deletable, <tt>false</tt> if not
53 */
54 protected abstract boolean isFileDeletable(FileStatus fStat);
55
56 }