/*
* Copyright © 2014 Cask Data, Inc.
*
* Licensed 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 co.cask.cdap.data2.dataset2.lib.table.leveldb;
import co.cask.cdap.api.common.Bytes;
import co.cask.cdap.api.dataset.table.ConflictDetection;
import co.cask.cdap.api.dataset.table.Scanner;
import co.cask.cdap.data2.dataset2.lib.table.ordered.BufferingOrderedTable;
import co.cask.cdap.data2.dataset2.lib.table.ordered.IncrementValue;
import co.cask.cdap.data2.dataset2.lib.table.ordered.PutValue;
import co.cask.cdap.data2.dataset2.lib.table.ordered.Update;
import co.cask.tephra.Transaction;
import com.google.common.collect.Maps;
import java.io.IOException;
import java.util.Map;
import java.util.NavigableMap;
import javax.annotation.Nullable;
/**
* A table client based on LevelDB.
*/
public class LevelDBOrderedTable extends BufferingOrderedTable {
private final LevelDBOrderedTableCore core;
private Transaction tx;
private long persistedVersion;
public LevelDBOrderedTable(String tableName, ConflictDetection level, LevelDBOrderedTableService service)
throws IOException {
super(tableName, level);
this.core = new LevelDBOrderedTableCore(tableName, service);
}
// TODO this is the same for all OcTableClient implementations -> promote to base class
@Override
public void startTx(Transaction tx) {
super.startTx(tx);
this.tx = tx;
}
@Override
public void increment(byte[] row, byte[][] columns, long[] amounts) throws Exception {
// for local operation with leveldb, we don't worry about the cost of reads
incrementAndGet(row, columns, amounts);
}
@Override
protected void persist(NavigableMap<byte[], NavigableMap<byte[], Update>> changes) throws Exception {
persistedVersion = tx == null ? System.currentTimeMillis() : tx.getWritePointer();
NavigableMap<byte[], NavigableMap<byte[], byte[]>> puts = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);
NavigableMap<byte[], NavigableMap<byte[], Long>> increments = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);
for (Map.Entry<byte[], NavigableMap<byte[], Update>> rowEntry : changes.entrySet()) {
for (Map.Entry<byte[], Update> colEntry : rowEntry.getValue().entrySet()) {
Update val = colEntry.getValue();
if (val instanceof IncrementValue) {
NavigableMap<byte[], Long> incrCols = increments.get(rowEntry.getKey());
if (incrCols == null) {
incrCols = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);
increments.put(rowEntry.getKey(), incrCols);
}
incrCols.put(colEntry.getKey(), ((IncrementValue) val).getValue());
} else if (val instanceof PutValue) {
NavigableMap<byte[], byte[]> putCols = puts.get(rowEntry.getKey());
if (putCols == null) {
putCols = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);
puts.put(rowEntry.getKey(), putCols);
}
putCols.put(colEntry.getKey(), ((PutValue) val).getValue());
}
}
}
for (Map.Entry<byte[], NavigableMap<byte[], Long>> incEntry : increments.entrySet()) {
core.increment(incEntry.getKey(), incEntry.getValue());
}
core.persist(puts, persistedVersion);
}
@Override
protected void undo(NavigableMap<byte[], NavigableMap<byte[], Update>> persisted) throws Exception {
core.undo(persisted, persistedVersion);
}
@Override
protected NavigableMap<byte[], byte[]> getPersisted(byte[] row, @Nullable byte[][] columns) throws Exception {
return core.getRow(row, columns, null, null, columns == null ? Integer.MAX_VALUE : columns.length, tx);
}
@Override
protected NavigableMap<byte[], byte[]> getPersisted(byte[] row, byte[] startColumn, byte[] stopColumn, int limit)
throws Exception {
return core.getRow(row, null, startColumn, stopColumn, limit, tx);
}
@Override
protected Scanner scanPersisted(byte[] startRow, byte[] stopRow) throws Exception {
return core.scan(startRow, stopRow, null, null, tx);
}
}