HeimingZ commented on a change in pull request #5320: URL: https://github.com/apache/iotdb/pull/5320#discussion_r834171945
########## File path: server/src/main/java/org/apache/iotdb/db/wal/buffer/AbstractWALBuffer.java ########## @@ -0,0 +1,77 @@ +/* + * 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.iotdb.db.wal.buffer; + +import org.apache.iotdb.db.engine.fileSystem.SystemFileFactory; +import org.apache.iotdb.db.wal.io.ILogWriter; +import org.apache.iotdb.db.wal.io.WALWriter; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.File; +import java.io.FileNotFoundException; +import java.io.IOException; +import java.util.concurrent.atomic.AtomicInteger; + +public abstract class AbstractWALBuffer implements IWALBuffer { + private static final Logger logger = LoggerFactory.getLogger(AbstractWALBuffer.class); + /** use size limit to control WALEdit number in each file */ + protected static final long LOG_SIZE_LIMIT = 10 * 1024 * 1024; + + /** WALNode identifier of this buffer */ + protected final String identifier; + /** directory to store .wal files */ + protected final String logDirectory; + /** current wal file version id */ + protected final AtomicInteger currentLogVersion = new AtomicInteger(); + /** current wal file log writer */ + protected volatile ILogWriter currentLogWriter; + + public AbstractWALBuffer(String identifier, String logDirectory) throws FileNotFoundException { + this.identifier = identifier; + this.logDirectory = logDirectory; + File logDirFile = SystemFileFactory.INSTANCE.getFile(logDirectory); + if (!logDirFile.exists() && logDirFile.mkdirs()) { + logger.info("create folder {} for wal buffer-{}.", logDirectory, identifier); + } + currentLogWriter = + new WALWriter( Review comment: Because wal segemented buffer, another type of buffer, can reuse these code. And WALSegementedBuffer is still under development. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
