| /* |
| * Copyright 2009-2012 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.storage.am.lsm.common.api; |
| |
| import java.util.Comparator; |
| import java.util.List; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.storage.am.common.api.IndexException; |
| import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMComponentFileReferences; |
| |
| /** |
| * Provides file names for LSM on-disk components. Also cleans up invalid files. |
| * There are separate methods to get file names for merge and flush because we |
| * need to guarantee the correct order of on-disk components (i.e., the |
| * components produced by flush are always newer than those produced by a |
| * merge). |
| */ |
| public interface ILSMIndexFileManager { |
| public void createDirs(); |
| |
| public void deleteDirs(); |
| |
| public LSMComponentFileReferences getRelFlushFileReference(); |
| |
| public LSMComponentFileReferences getRelMergeFileReference(String firstFileName, String lastFileName) |
| throws HyracksDataException; |
| |
| public String getBaseDir(); |
| |
| // Deletes invalid files, and returns list of valid files from baseDir. |
| // The returned valid files are correctly sorted (based on the recency of data). |
| public List<LSMComponentFileReferences> cleanupAndGetValidFiles() throws HyracksDataException, IndexException; |
| |
| public Comparator<String> getFileNameComparator(); |
| } |