ArrowPageSourceProvider.java
/*
* 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 com.facebook.plugin.arrow;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ConnectorPageSource;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.ConnectorSplit;
import com.facebook.presto.spi.SplitContext;
import com.facebook.presto.spi.connector.ConnectorPageSourceProvider;
import com.facebook.presto.spi.connector.ConnectorTransactionHandle;
import com.google.common.collect.ImmutableList;
import javax.inject.Inject;
import java.util.List;
import static java.util.Objects.requireNonNull;
public class ArrowPageSourceProvider
implements ConnectorPageSourceProvider
{
private final BaseArrowFlightClientHandler clientHandler;
private final ArrowBlockBuilder arrowBlockBuilder;
@Inject
public ArrowPageSourceProvider(BaseArrowFlightClientHandler clientHandler, ArrowBlockBuilder arrowBlockBuilder)
{
this.clientHandler = requireNonNull(clientHandler, "clientHandler is null");
this.arrowBlockBuilder = requireNonNull(arrowBlockBuilder, "arrowBlockBuilder is null");
}
@Override
public ConnectorPageSource createPageSource(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorSplit split, List<ColumnHandle> columns, SplitContext splitContext)
{
ImmutableList.Builder<ArrowColumnHandle> columnHandles = ImmutableList.builder();
for (ColumnHandle handle : columns) {
columnHandles.add((ArrowColumnHandle) handle);
}
ArrowSplit arrowSplit = (ArrowSplit) split;
return new ArrowPageSource(arrowSplit, columnHandles.build(), clientHandler, session, arrowBlockBuilder);
}
}