| /* |
| * 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.jackrabbit.oak.segment.aws; |
| |
| import com.amazonaws.services.dynamodbv2.document.Item; |
| |
| import org.apache.jackrabbit.oak.segment.spi.persistence.JournalFile; |
| import org.apache.jackrabbit.oak.segment.spi.persistence.JournalFileReader; |
| import org.apache.jackrabbit.oak.segment.spi.persistence.JournalFileWriter; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import static org.apache.jackrabbit.oak.segment.aws.DynamoDBClient.TABLE_ATTR_CONTENT; |
| |
| public class AwsJournalFile implements JournalFile { |
| |
| private static final Logger log = LoggerFactory.getLogger(AwsJournalFile.class); |
| |
| private final DynamoDBClient dynamoDBClient; |
| private final String fileName; |
| |
| public AwsJournalFile(DynamoDBClient dynamoDBClient, String fileName) { |
| this.dynamoDBClient = dynamoDBClient; |
| this.fileName = fileName; |
| } |
| |
| @Override |
| public JournalFileReader openJournalReader() throws IOException { |
| return new AwsFileReader(dynamoDBClient, fileName); |
| } |
| |
| @Override |
| public JournalFileWriter openJournalWriter() throws IOException { |
| return new AwsFileWriter(dynamoDBClient, fileName); |
| } |
| |
| @Override |
| public String getName() { |
| return fileName; |
| } |
| |
| @Override |
| public boolean exists() { |
| try { |
| return openJournalReader().readLine() != null; |
| } catch (IOException e) { |
| log.error("Can't check if the file exists", e); |
| return false; |
| } |
| } |
| |
| private static class AwsFileWriter implements JournalFileWriter { |
| private final DynamoDBClient dynamoDBClient; |
| private final String fileName; |
| |
| public AwsFileWriter(DynamoDBClient dynamoDBClient, String fileName) { |
| this.dynamoDBClient = dynamoDBClient; |
| this.fileName = fileName; |
| } |
| |
| @Override |
| public void close() { |
| // Do nothing |
| } |
| |
| @Override |
| public void truncate() throws IOException { |
| dynamoDBClient.deleteAllDocuments(fileName); |
| } |
| |
| @Override |
| public void writeLine(String line) throws IOException { |
| dynamoDBClient.putDocument(fileName, line); |
| } |
| |
| @Override |
| public void batchWriteLines(List<String> lines) throws IOException { |
| dynamoDBClient.batchPutDocument(fileName, lines); |
| } |
| } |
| |
| private static class AwsFileReader implements JournalFileReader { |
| |
| private final DynamoDBClient dynamoDBClient; |
| private final String fileName; |
| |
| private Iterator<Item> iterator; |
| |
| public AwsFileReader(DynamoDBClient dynamoDBClient, String fileName) { |
| this.dynamoDBClient = dynamoDBClient; |
| this.fileName = fileName; |
| } |
| |
| @Override |
| public void close() { |
| // Do nothing |
| } |
| |
| @Override |
| public String readLine() throws IOException { |
| if (iterator == null) { |
| iterator = dynamoDBClient.getDocumentsStream(fileName).iterator(); |
| } |
| |
| if (iterator.hasNext()) { |
| return iterator.next().getString(TABLE_ATTR_CONTENT); |
| } |
| |
| return null; |
| } |
| } |
| } |