/*
* 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.transaction.stream.inmemory;
import co.cask.cdap.api.common.Bytes;
import co.cask.cdap.api.dataset.table.Row;
import co.cask.cdap.data2.dataset2.lib.table.inmemory.InMemoryTable;
import co.cask.cdap.data2.transaction.stream.StreamConfig;
import co.cask.cdap.data2.transaction.stream.StreamConsumerStateStore;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.Maps;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
/**
*
*/
public final class InMemoryStreamConsumerStateStore extends StreamConsumerStateStore {
private final InMemoryTable table;
protected InMemoryStreamConsumerStateStore(StreamConfig streamConfig, InMemoryTable table) {
super(streamConfig);
this.table = table;
}
@Override
protected byte[] fetch(byte[] row, byte[] column) throws IOException {
try {
return table.get(row, column);
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
protected void fetchAll(byte[] row, Map<byte[], byte[]> result) throws IOException {
try {
Row fetched = table.get(row);
if (!fetched.isEmpty()) {
result.putAll(fetched.getColumns());
}
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
protected void fetchAll(byte[] row, byte[] columnPrefix, Map<byte[], byte[]> result) throws IOException {
// Ignore the column prefix. Parent class would handle it.
fetchAll(row, result);
}
@Override
protected void store(byte[] row, byte[] column, byte[] value) throws IOException {
store(row, ImmutableSortedMap.<byte[], byte[]>orderedBy(Bytes.BYTES_COMPARATOR).put(column, value).build());
}
@Override
protected void store(byte[] row, Map<byte[], byte[]> values) throws IOException {
if (values.isEmpty()) {
return;
}
byte[][] columns = new byte[values.size()][];
byte[][] vals = new byte[values.size()][];
int i = 0;
for (Map.Entry<byte[], byte[]> columnValue : values.entrySet()) {
columns[i] = columnValue.getKey();
vals[i] = columnValue.getValue().length > 0 ? columnValue.getValue() : null;
i++;
}
try {
table.put(row, columns, vals);
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
protected void delete(byte[] row, Set<byte[]> columns) throws IOException {
if (columns.isEmpty()) {
return;
}
Map<byte[], byte[]> deleteColumns = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);
for (byte[] column : columns) {
deleteColumns.put(column, Bytes.EMPTY_BYTE_ARRAY); // Value doesn't matter
}
byte[][] columnsArr = new byte[columns.size()][];
int i = 0;
for (byte[] column : columns) {
columnsArr[i] = column;
i++;
}
try {
table.delete(row, columnsArr);
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
public void close() throws IOException {
// No-op
}
}