| /* |
| * 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.fluo.accumulo.iterators; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| import java.util.Map; |
| |
| import org.apache.accumulo.core.data.ByteSequence; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.PartialKey; |
| import org.apache.accumulo.core.data.Range; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.accumulo.core.iterators.IteratorEnvironment; |
| import org.apache.accumulo.core.iterators.SortedKeyValueIterator; |
| import org.apache.fluo.accumulo.util.ColumnType; |
| import org.apache.fluo.accumulo.util.ReadLockUtil; |
| |
| import static org.apache.fluo.accumulo.util.ColumnConstants.TIMESTAMP_MASK; |
| |
| public class OpenReadLockIterator implements SortedKeyValueIterator<Key, Value> { |
| |
| private TimestampSkippingIterator source; |
| |
| private Key lastDelete; |
| |
| private void findTop() throws IOException { |
| while (source.hasTop()) { |
| |
| ColumnType colType = ColumnType.from(source.getTopKey()); |
| |
| switch (colType) { |
| case TX_DONE: |
| case WRITE: |
| case DEL_LOCK: { |
| source.skipToPrefix(source.getTopKey(), ColumnType.RLOCK); |
| break; |
| } |
| case RLOCK: { |
| if (ReadLockUtil.isDelete(source.getTopKey())) { |
| lastDelete.set(source.getTopKey()); |
| } else { |
| if (lastDelete.equals(source.getTopKey(), PartialKey.ROW_COLFAM_COLQUAL_COLVIS)) { |
| long ts1 = ReadLockUtil.decodeTs(source.getTopKey().getTimestamp() & TIMESTAMP_MASK); |
| long ts2 = ReadLockUtil.decodeTs(lastDelete.getTimestamp() & TIMESTAMP_MASK); |
| |
| if (ts1 != ts2) { |
| // found a read lock that is not suppressed by a delete read lock entry |
| return; |
| } |
| } else { |
| // found a read lock that is not suppressed by a delete read lock entry |
| return; |
| } |
| } |
| source.next(); |
| break; |
| } |
| case DATA: |
| case LOCK: |
| case ACK: { |
| source.skipColumn(source.getTopKey()); |
| break; |
| } |
| default: |
| throw new IllegalArgumentException("Unknown column type " + source.getTopKey()); |
| } |
| } |
| } |
| |
| @Override |
| public void init(SortedKeyValueIterator<Key, Value> source, Map<String, String> options, |
| IteratorEnvironment env) throws IOException { |
| this.source = new TimestampSkippingIterator(source); |
| } |
| |
| @Override |
| public boolean hasTop() { |
| return source.hasTop(); |
| } |
| |
| @Override |
| public void next() throws IOException { |
| source.next(); |
| findTop(); |
| } |
| |
| @Override |
| public void seek(Range range, Collection<ByteSequence> columnFamilies, boolean inclusive) |
| throws IOException { |
| |
| lastDelete = new Key(); |
| |
| Collection<ByteSequence> fams; |
| if (columnFamilies.isEmpty() && !inclusive) { |
| fams = SnapshotIterator.NOTIFY_CF_SET; |
| inclusive = false; |
| } else { |
| fams = columnFamilies; |
| } |
| |
| source.seek(range, fams, inclusive); |
| findTop(); |
| } |
| |
| @Override |
| public Key getTopKey() { |
| return source.getTopKey(); |
| } |
| |
| @Override |
| public Value getTopValue() { |
| return source.getTopValue(); |
| } |
| |
| @Override |
| public SortedKeyValueIterator<Key, Value> deepCopy(IteratorEnvironment env) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| } |