| /* |
| * * |
| * * 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.crunch.io.hbase; |
| |
| import org.apache.crunch.Pair; |
| import org.apache.hadoop.hbase.client.Connection; |
| 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.client.Table; |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| class HTableIterator implements Iterator<Pair<ImmutableBytesWritable, Result>> { |
| private static final Logger LOG = LoggerFactory.getLogger(HTableIterator.class); |
| |
| private final Table table; |
| private final Connection connection; |
| private final Iterator<Scan> scans; |
| private ResultScanner scanner; |
| private Iterator<Result> iter; |
| |
| public HTableIterator(Connection connection, Table table, List<Scan> scans) { |
| this.table = table; |
| this.connection = connection; |
| this.scans = scans.iterator(); |
| try{ |
| this.scanner = table.getScanner(this.scans.next()); |
| }catch(IOException ioe){ |
| throw new RuntimeException(ioe); |
| } |
| this.iter = scanner.iterator(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| boolean hasNext = iter.hasNext(); |
| if (!hasNext) { |
| scanner.close(); |
| hasNext = scans.hasNext(); |
| if(hasNext){ |
| try{ |
| scanner = table.getScanner(this.scans.next()); |
| iter = scanner.iterator(); |
| } catch(IOException ioe){ |
| throw new RuntimeException("Unable to create next scanner from "+ table.getName(), ioe); |
| } |
| } else { |
| try { |
| table.close(); |
| } catch (IOException e) { |
| LOG.error("Exception closing Table: {}", table.getName(), e); |
| } |
| try { |
| connection.close(); |
| } catch (IOException e) { |
| LOG.error("Exception closing Table: {}", table.getName(), e); |
| } |
| } |
| } |
| return hasNext; |
| } |
| |
| @Override |
| public Pair<ImmutableBytesWritable, Result> next() { |
| Result next = iter.next(); |
| return Pair.of(new ImmutableBytesWritable(next.getRow()), next); |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |