| /* |
| * 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.eagle.log.entity; |
| |
| import org.apache.eagle.log.entity.meta.EntityDefinition; |
| import org.apache.hadoop.hbase.client.HTableInterface; |
| import org.apache.hadoop.hbase.client.Result; |
| import org.apache.hadoop.hbase.client.ResultScanner; |
| import org.apache.hadoop.hbase.client.Scan; |
| import org.apache.hadoop.hbase.filter.Filter; |
| |
| import java.io.IOException; |
| import java.util.Date; |
| import java.util.List; |
| |
| public class HBaseLogReader2 extends AbstractHBaseLogReader<InternalLog> { |
| protected ResultScanner rs; |
| |
| public HBaseLogReader2(EntityDefinition ed, List<String> partitions, Date startTime, Date endTime, Filter filter, String lastScanKey, byte[][] outputQualifiers) { |
| super(ed, partitions, startTime, endTime, filter, lastScanKey, outputQualifiers); |
| } |
| |
| /** |
| * This constructor supports partition. |
| * |
| * @param ed entity definition |
| * @param partitions partition values, which is sorted in partition definition order. TODO: in future we need to support |
| * multiple values for one partition field |
| * @param startTime start time of the query |
| * @param endTime end time of the query |
| * @param filter filter for the hbase scan |
| * @param lastScanKey the key of last scan |
| * @param outputQualifiers the bytes of output qualifier names |
| * @param prefix can be populated from outside world specifically for generic metric reader |
| */ |
| public HBaseLogReader2(EntityDefinition ed, List<String> partitions, Date startTime, Date endTime, Filter filter, String lastScanKey, byte[][] outputQualifiers, String prefix) { |
| super(ed, partitions, startTime, endTime, filter, lastScanKey, outputQualifiers, prefix); |
| } |
| |
| @Override |
| protected void onOpen(HTableInterface tbl, Scan scan) throws IOException { |
| rs = tbl.getScanner(scan); |
| } |
| |
| /** |
| * <h2>Close:</h2> |
| * 1. Call super.close(): release current table connection <br></br> |
| * 2. Close Scanner<br></br> |
| * |
| * @throws IOException |
| */ |
| @Override |
| public void close() throws IOException { |
| super.close(); |
| if(rs != null){ |
| rs.close(); |
| } |
| } |
| |
| @Override |
| public InternalLog read() throws IOException { |
| if (rs == null) |
| throw new IllegalArgumentException( |
| "ResultScanner must be initialized before reading"); |
| InternalLog t = null; |
| Result r = rs.next(); |
| if (r != null) { |
| t = HBaseInternalLogHelper.parse(_ed, r, qualifiers); |
| } |
| return t; |
| } |
| } |