/*
* Copyright 2011 The Apache Software Foundation
*
* 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.lealone.hbase.dbobject.index;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.util.Bytes;
import org.lealone.constant.Constants;
import org.lealone.dbobject.index.BaseIndex;
import org.lealone.dbobject.index.Cursor;
import org.lealone.dbobject.index.IndexType;
import org.lealone.dbobject.table.IndexColumn;
import org.lealone.dbobject.table.Table;
import org.lealone.dbobject.table.TableFilter;
import org.lealone.engine.Session;
import org.lealone.hbase.dbobject.table.HBaseTable;
import org.lealone.hbase.engine.HBaseConstants;
import org.lealone.hbase.engine.HBaseSession;
import org.lealone.hbase.result.HBaseRow;
import org.lealone.message.DbException;
import org.lealone.result.Row;
import org.lealone.result.SearchRow;
import org.lealone.result.SortOrder;
public class HBasePrimaryIndex extends BaseIndex {
private final byte[] defaultColumnFamilyName;
public HBasePrimaryIndex(Table table, int id, IndexColumn[] columns, IndexType indexType) {
initBaseIndex(table, id, table.getName() + "_DATA", columns, indexType);
defaultColumnFamilyName = ((HBaseTable) table).getDefaultColumnFamilyNameAsBytes();
}
@Override
public void add(Session session, Row row) {
try {
((HBaseSession) session).getRegionServer().put(((HBaseRow) row).getRegionName(), ((HBaseRow) row).getPut());
} catch (IOException e) {
throw DbException.convert(e);
}
}
@Override
public void remove(Session session, Row row) {
remove(session, row, false);
}
public void remove(Session session, Row row, boolean isUndo) {
HBaseRow hr = (HBaseRow) row;
if (hr.isForUpdate()) //Update这种类型的SQL不需要先删除再insert，只需直接insert即可
return;
try {
HBaseSession hs = (HBaseSession) session;
if (isUndo) {
Put oldPut = hr.getPut();
//撤消前面的add或remove操作
if (oldPut != null) {
Delete delete = new Delete(oldPut.getRow());
for (Map.Entry<byte[], List<KeyValue>> e : oldPut.getFamilyMap().entrySet()) {
for (KeyValue kv : e.getValue()) {
delete.deleteColumn(e.getKey(), kv.getQualifier(), kv.getTimestamp());
}
}
hs.getRegionServer().delete(hr.getRegionName(), delete);
} else
throw DbException.throwInternalError("oldPut is null???");
} else {
//正常的delete语句，
//这种场景会把要删除的记录找出来，此时用Put的方式，不能直接用Delete，因为用Delete后如果当前事务未提交
//那么其它并发事务就找不到之前的记录版本
Result result = hr.getResult();
if (result != null) {
Put put = hs.getTransaction().createHBasePutWithDeleteTag(defaultColumnFamilyName, result.getRow());
for (KeyValue kv : result.list()) {
if (Bytes.equals(kv.getQualifier(), HBaseConstants.TRANSACTION_META) //
&& Bytes.equals(kv.getFamily(), defaultColumnFamilyName))
continue;
put.add(kv.getFamily(), kv.getQualifier(), null);
}
hs.getRegionServer().put(hr.getRegionName(), put);
hr.setPut(put);
} else
throw DbException.throwInternalError("result is null???");
}
} catch (IOException e) {
throw DbException.convert(e);
}
}
@Override
public Cursor find(TableFilter filter, SearchRow first, SearchRow last) {
//是一个join子查询
if ((filter.getSelect() != null && filter.getSelect().getTopTableFilter() != filter))
return new SubqueryCursor(filter, first, last);
else
return new HBasePrimaryIndexCursor(filter, first, last);
}
@Override
public Cursor find(Session session, SearchRow first, SearchRow last) {
throw DbException.getUnsupportedException("find(Session, SearchRow, SearchRow)");
}
@Override
public double getCost(Session session, int[] masks, SortOrder sortOrder) {
return 10 * Constants.COST_ROW_OFFSET + 100;
}
@Override
public void close(Session session) {
}
@Override
public void remove(Session session) {
}
@Override
public void truncate(Session session) {
}
@Override
public boolean canGetFirstOrLast() {
return false;
}
@Override
public Cursor findFirstOrLast(Session session, boolean first) {
throw DbException.getUnsupportedException("findFirstOrLast");
}
@Override
public boolean needRebuild() {
return false;
}
@Override
public long getRowCount(Session session) {
return 0;
}
@Override
public long getRowCountApproximation() {
return 0;
}
@Override
public void checkRename() {
}
@Override
public long getDiskSpaceUsed() {
return 0;
}
@Override
public String getCreateSQL() {
return null;
}
}