/*
* 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.example;
import com.facebook.presto.spi.ConnectorColumnHandle;
import com.facebook.presto.spi.ConnectorPartition;
import com.facebook.presto.spi.ConnectorPartitionResult;
import com.facebook.presto.spi.ConnectorSplit;
import com.facebook.presto.spi.ConnectorSplitManager;
import com.facebook.presto.spi.ConnectorSplitSource;
import com.facebook.presto.spi.ConnectorTableHandle;
import com.facebook.presto.spi.FixedSplitSource;
import com.facebook.presto.spi.TupleDomain;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import javax.inject.Inject;
import java.net.URI;
import java.util.Collections;
import java.util.List;
import static com.facebook.presto.example.Types.checkType;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
public class ExampleSplitManager
implements ConnectorSplitManager
{
private final String connectorId;
private final ExampleClient exampleClient;
@Inject
public ExampleSplitManager(ExampleConnectorId connectorId, ExampleClient exampleClient)
{
this.connectorId = checkNotNull(connectorId, "connectorId is null").toString();
this.exampleClient = checkNotNull(exampleClient, "client is null");
}
@Override
public ConnectorPartitionResult getPartitions(ConnectorTableHandle tableHandle, TupleDomain<ConnectorColumnHandle> tupleDomain)
{
ExampleTableHandle exampleTableHandle = checkType(tableHandle, ExampleTableHandle.class, "tableHandle");
// example connector has only one partition
List<ConnectorPartition> partitions = ImmutableList.<ConnectorPartition>of(new ExamplePartition(exampleTableHandle.getSchemaName(), exampleTableHandle.getTableName()));
// example connector does not do any additional processing/filtering with the TupleDomain, so just return the whole TupleDomain
return new ConnectorPartitionResult(partitions, tupleDomain);
}
@Override
public ConnectorSplitSource getPartitionSplits(ConnectorTableHandle tableHandle, List<ConnectorPartition> partitions)
{
checkNotNull(partitions, "partitions is null");
checkArgument(partitions.size() == 1, "Expected one partition but got %s", partitions.size());
ConnectorPartition partition = partitions.get(0);
ExamplePartition examplePartition = checkType(partition, ExamplePartition.class, "partition");
ExampleTableHandle exampleTableHandle = (ExampleTableHandle) tableHandle;
ExampleTable table = exampleClient.getTable(exampleTableHandle.getSchemaName(), exampleTableHandle.getTableName());
// this can happen if table is removed during a query
checkState(table != null, "Table %s.%s no longer exists", exampleTableHandle.getSchemaName(), exampleTableHandle.getTableName());
List<ConnectorSplit> splits = Lists.newArrayList();
for (URI uri : table.getSources()) {
splits.add(new ExampleSplit(connectorId, examplePartition.getSchemaName(), examplePartition.getTableName(), uri));
}
Collections.shuffle(splits);
return new FixedSplitSource(connectorId, splits);
}
}