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Presto - Local File Connector
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/*
* 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.presto.localfile;
import com.facebook.presto.common.predicate.TupleDomain;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.ConnectorSplit;
import com.facebook.presto.spi.ConnectorSplitSource;
import com.facebook.presto.spi.ConnectorTableLayoutHandle;
import com.facebook.presto.spi.FixedSplitSource;
import com.facebook.presto.spi.NodeManager;
import com.facebook.presto.spi.connector.ConnectorSplitManager;
import com.facebook.presto.spi.connector.ConnectorTransactionHandle;
import javax.inject.Inject;
import java.util.List;
import java.util.stream.Collectors;
import static java.util.Objects.requireNonNull;
public class LocalFileSplitManager
implements ConnectorSplitManager
{
private final NodeManager nodeManager;
@Inject
public LocalFileSplitManager(NodeManager nodeManager)
{
this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
}
@Override
public ConnectorSplitSource getSplits(
ConnectorTransactionHandle transactionHandle,
ConnectorSession session,
ConnectorTableLayoutHandle layout,
SplitSchedulingContext splitSchedulingContext)
{
LocalFileTableLayoutHandle layoutHandle = (LocalFileTableLayoutHandle) layout;
LocalFileTableHandle tableHandle = layoutHandle.getTable();
TupleDomain effectivePredicate = layoutHandle.getConstraint()
.transform(LocalFileColumnHandle.class::cast);
List splits = nodeManager.getAllNodes().stream()
.map(node -> new LocalFileSplit(node.getHostAndPort(), tableHandle.getSchemaTableName(), effectivePredicate))
.collect(Collectors.toList());
return new FixedSplitSource(splits);
}
}