| /* |
| * 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.core.impl; |
| |
| import java.util.Map.Entry; |
| |
| import org.apache.accumulo.core.client.IteratorSetting; |
| import org.apache.accumulo.core.data.Key; |
| import org.apache.accumulo.core.data.Value; |
| import org.apache.fluo.accumulo.iterators.RollbackCheckIterator; |
| import org.apache.fluo.accumulo.util.ColumnConstants; |
| import org.apache.fluo.accumulo.util.ColumnType; |
| import org.apache.fluo.accumulo.values.DelLockValue; |
| import org.apache.fluo.accumulo.values.WriteValue; |
| import org.apache.fluo.api.data.Bytes; |
| import org.apache.fluo.api.data.Column; |
| import org.apache.fluo.core.util.ColumnUtil; |
| |
| public class TxInfo { |
| public TxStatus status = null; |
| public long commitTs = -1; |
| public byte[] lockValue = null; |
| |
| /** |
| * determine the what state a transaction is in by inspecting the primary column |
| */ |
| public static TxInfo getTransactionInfo(Environment env, Bytes prow, Column pcol, long startTs) { |
| // TODO ensure primary is visible |
| |
| IteratorSetting is = new IteratorSetting(10, RollbackCheckIterator.class); |
| RollbackCheckIterator.setLocktime(is, startTs); |
| |
| Entry<Key, Value> entry = ColumnUtil.checkColumn(env, is, prow, pcol); |
| |
| TxInfo txInfo = new TxInfo(); |
| |
| if (entry == null) { |
| txInfo.status = TxStatus.UNKNOWN; |
| return txInfo; |
| } |
| |
| ColumnType colType = ColumnType.from(entry.getKey()); |
| long ts = entry.getKey().getTimestamp() & ColumnConstants.TIMESTAMP_MASK; |
| |
| switch (colType) { |
| case LOCK: { |
| if (ts == startTs) { |
| txInfo.status = TxStatus.LOCKED; |
| txInfo.lockValue = entry.getValue().get(); |
| } else { |
| txInfo.status = TxStatus.UNKNOWN; // locked by another tx |
| } |
| break; |
| } |
| case DEL_LOCK: { |
| DelLockValue dlv = new DelLockValue(entry.getValue().get()); |
| |
| if (ts != startTs) { |
| // expect this to always be false, must be a bug in the iterator |
| throw new IllegalStateException(prow + " " + pcol + " (" + ts + " != " + startTs + ") "); |
| } |
| |
| if (dlv.isRollback()) { |
| txInfo.status = TxStatus.ROLLED_BACK; |
| } else { |
| txInfo.status = TxStatus.COMMITTED; |
| txInfo.commitTs = dlv.getCommitTimestamp(); |
| } |
| break; |
| } |
| case WRITE: { |
| long timePtr = WriteValue.getTimestamp(entry.getValue().get()); |
| |
| if (timePtr != startTs) { |
| // expect this to always be false, must be a bug in the iterator |
| throw new IllegalStateException( |
| prow + " " + pcol + " (" + timePtr + " != " + startTs + ") "); |
| } |
| |
| txInfo.status = TxStatus.COMMITTED; |
| txInfo.commitTs = ts; |
| break; |
| } |
| default: |
| throw new IllegalStateException("unexpected col type returned " + colType); |
| } |
| |
| return txInfo; |
| } |
| } |