/*
* 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.connector.informationSchema;
import com.facebook.presto.metadata.InternalNodeManager;
import com.facebook.presto.spi.ColumnHandle;
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.HostAddress;
import com.facebook.presto.spi.connector.ConnectorSplitManager;
import com.facebook.presto.spi.connector.ConnectorTransactionHandle;
import com.facebook.presto.spi.predicate.NullableValue;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import static com.facebook.presto.spi.predicate.TupleDomain.extractFixedValues;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toMap;
public class InformationSchemaSplitManager
implements ConnectorSplitManager
{
private final InternalNodeManager nodeManager;
public InformationSchemaSplitManager(InternalNodeManager nodeManager)
{
this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
}
@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transaction, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
InformationSchemaTableLayoutHandle handle = (InformationSchemaTableLayoutHandle) layout;
Map<ColumnHandle, NullableValue> bindings = extractFixedValues(handle.getConstraint()).orElse(ImmutableMap.of());
List<HostAddress> localAddress = ImmutableList.of(nodeManager.getCurrentNode().getHostAndPort());
Map<String, NullableValue> filters = bindings.entrySet().stream().collect(toMap(
entry -> ((InformationSchemaColumnHandle) entry.getKey()).getColumnName(),
Entry::getValue));
ConnectorSplit split = new InformationSchemaSplit(handle.getTable(), filters, localAddress);
return new FixedSplitSource(ImmutableList.of(split));
}
}