/*
* 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.phoenix.compile;
import static org.apache.phoenix.query.QueryConstants.AGG_TIMESTAMP;
import static org.apache.phoenix.query.QueryConstants.SINGLE_COLUMN;
import static org.apache.phoenix.query.QueryConstants.SINGLE_COLUMN_FAMILY;
import static org.apache.phoenix.query.QueryConstants.UNGROUPED_AGG_ROW_KEY;
import java.sql.SQLException;
import java.util.List;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.phoenix.execute.MutationState;
import org.apache.phoenix.iterate.ParallelIterators.ParallelIteratorFactory;
import org.apache.phoenix.iterate.PeekingResultIterator;
import org.apache.phoenix.iterate.ResultIterator;
import org.apache.phoenix.jdbc.PhoenixConnection;
import org.apache.phoenix.query.ConnectionQueryServices;
import org.apache.phoenix.query.QueryServices;
import org.apache.phoenix.query.QueryServicesOptions;
import org.apache.phoenix.schema.PDataType;
import org.apache.phoenix.schema.TableRef;
import org.apache.phoenix.schema.tuple.SingleKeyValueTuple;
import org.apache.phoenix.schema.tuple.Tuple;
import org.apache.phoenix.util.KeyValueUtil;
/**
* Factory class used to instantiate an iterator to handle mutations made during a parallel scan.
*/
public abstract class MutatingParallelIteratorFactory implements ParallelIteratorFactory {
protected final PhoenixConnection connection;
protected final TableRef tableRef;
protected MutatingParallelIteratorFactory(PhoenixConnection connection, TableRef tableRef) {
this.connection = connection;
this.tableRef = tableRef;
}
/**
* Method that does the actual mutation work
*/
abstract protected MutationState mutate(StatementContext context, ResultIterator iterator, PhoenixConnection connection) throws SQLException;
@Override
public PeekingResultIterator newIterator(StatementContext context, ResultIterator iterator, Scan scan) throws SQLException {
final PhoenixConnection connection = new PhoenixConnection(this.connection);
MutationState state = mutate(context, iterator, connection);
long totalRowCount = state.getUpdateCount();
if (connection.getAutoCommit()) {
connection.getMutationState().join(state);
connection.commit();
ConnectionQueryServices services = connection.getQueryServices();
int maxSize = services.getProps().getInt(QueryServices.MAX_MUTATION_SIZE_ATTRIB,QueryServicesOptions.DEFAULT_MAX_MUTATION_SIZE);
state = new MutationState(maxSize, connection, totalRowCount);
}
final MutationState finalState = state;
byte[] value = PDataType.LONG.toBytes(totalRowCount);
KeyValue keyValue = KeyValueUtil.newKeyValue(UNGROUPED_AGG_ROW_KEY, SINGLE_COLUMN_FAMILY, SINGLE_COLUMN, AGG_TIMESTAMP, value, 0, value.length);
final Tuple tuple = new SingleKeyValueTuple(keyValue);
return new PeekingResultIterator() {
private boolean done = false;
@Override
public Tuple next() throws SQLException {
if (done) {
return null;
}
done = true;
return tuple;
}
@Override
public void explain(List<String> planSteps) {
}
@Override
public void close() throws SQLException {
try {
// Join the child mutation states in close, since this is called in a single threaded manner
// after the parallel results have been processed.
if (!connection.getAutoCommit()) {
MutatingParallelIteratorFactory.this.connection.getMutationState().join(finalState);
}
} finally {
connection.close();
}
}
@Override
public Tuple peek() throws SQLException {
return done ? null : tuple;
}
};
}
}