/*
* 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.system;
import com.facebook.presto.metadata.Node;
import com.facebook.presto.metadata.NodeManager;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ConnectorSplitManager;
import com.facebook.presto.spi.HostAddress;
import com.facebook.presto.spi.Partition;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.Split;
import com.facebook.presto.spi.SystemTable;
import com.facebook.presto.spi.TableHandle;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import javax.inject.Inject;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
public class SystemSplitManager
implements ConnectorSplitManager
{
private final NodeManager nodeManager;
private final ConcurrentMap<SchemaTableName, SystemTable> tables = new ConcurrentHashMap<>();
@Inject
public SystemSplitManager(NodeManager nodeManager)
{
this.nodeManager = checkNotNull(nodeManager, "nodeManager is null");
}
public void addTable(SystemTable systemTable)
{
checkNotNull(systemTable, "systemTable is null");
SchemaTableName tableName = systemTable.getTableMetadata().getTable();
checkArgument(tables.putIfAbsent(tableName, systemTable) == null, "Table %s is already registered", tableName);
}
@Override
public String getConnectorId()
{
// system is not a connector
return null;
}
@Override
public boolean canHandle(TableHandle handle)
{
return handle instanceof SystemTableHandle;
}
@Override
public List<Partition> getPartitions(TableHandle table, Map<ColumnHandle, Object> bindings)
{
checkNotNull(table, "table is null");
checkNotNull(bindings, "bindings is null");
checkArgument(table instanceof SystemTableHandle, "TableHandle must be an SystemTableHandle");
SystemTableHandle systemTableHandle = (SystemTableHandle) table;
return ImmutableList.<Partition>of(new SystemPartition(systemTableHandle, bindings));
}
@Override
public Iterable<Split> getPartitionSplits(TableHandle table, List<Partition> partitions)
{
checkNotNull(partitions, "partitions is null");
if (partitions.isEmpty()) {
return ImmutableList.of();
}
Partition partition = Iterables.getOnlyElement(partitions);
checkArgument(partition instanceof SystemPartition, "Partition must be a system partition");
SystemPartition systemPartition = (SystemPartition) partition;
SystemTable systemTable = tables.get(systemPartition.getTableHandle().getSchemaTableName());
checkArgument(systemTable != null, "Table %s does not exist", systemPartition.getTableHandle().getTableName());
ImmutableMap.Builder<String, Object> filters = ImmutableMap.builder();
for (Entry<ColumnHandle, Object> entry : systemPartition.getFilters().entrySet()) {
SystemColumnHandle systemColumnHandle = (SystemColumnHandle) entry.getKey();
filters.put(systemColumnHandle.getColumnName(), entry.getValue());
}
if (systemTable.isDistributed()) {
ImmutableList.Builder<Split> splits = ImmutableList.builder();
for (Node node : nodeManager.getAllNodes().getActiveNodes()) {
splits.add(new SystemSplit(systemPartition.tableHandle, filters.build(), node.getHostAndPort()));
}
return splits.build();
}
HostAddress address = nodeManager.getCurrentNode().getHostAndPort();
Split split = new SystemSplit(systemPartition.tableHandle, filters.build(), address);
return ImmutableList.of(split);
}
public static class SystemPartition
implements Partition
{
private final SystemTableHandle tableHandle;
private final Map<ColumnHandle, Object> filters;
public SystemPartition(SystemTableHandle tableHandle, Map<ColumnHandle, Object> filters)
{
this.tableHandle = checkNotNull(tableHandle, "tableHandle is null");
this.filters = ImmutableMap.copyOf(checkNotNull(filters, "filters is null"));
}
public SystemTableHandle getTableHandle()
{
return tableHandle;
}
@Override
public String getPartitionId()
{
return tableHandle.getSchemaTableName().toString();
}
@Override
public Map<ColumnHandle, Object> getKeys()
{
return ImmutableMap.of();
}
public Map<ColumnHandle, Object> getFilters()
{
return filters;
}
@Override
public String toString()
{
return Objects.toStringHelper(this)
.add("tableHandle", tableHandle)
.add("filters", filters)
.toString();
}
}
}