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 /**
27 * Base class for file cleaners which allows subclasses to implement a simple
28 * isFileDeletable method (which used to be the FileCleanerDelegate contract).
29 */
30 public abstract class BaseFileCleanerDelegate extends BaseConfigurable
31 implements FileCleanerDelegate {
32
33 @Override
34 public Iterable<FileStatus> getDeletableFiles(Iterable<FileStatus> files) {
35 return Iterables.filter(files, new Predicate<FileStatus>() {
36 @Override
37 public boolean apply(FileStatus file) {
38 return isFileDeletable(file);
39 }});
40 }
41
42 /**
43 * Should the master delete the file or keep it?
44 * @param fStat file status of the file to check
45 * @return <tt>true</tt> if the file is deletable, <tt>false</tt> if not
46 */
47 protected abstract boolean isFileDeletable(FileStatus fStat);
48
49 }