/*
* 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.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.Node;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.SystemTable;
import com.facebook.presto.spi.SystemTable.Distribution;
import com.facebook.presto.spi.connector.ConnectorSplitManager;
import com.facebook.presto.spi.connector.ConnectorTransactionHandle;
import com.facebook.presto.spi.predicate.TupleDomain;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import java.util.Map;
import java.util.Set;
import static com.facebook.presto.spi.NodeState.ACTIVE;
import static com.facebook.presto.spi.SystemTable.Distribution.ALL_COORDINATORS;
import static com.facebook.presto.spi.SystemTable.Distribution.ALL_NODES;
import static com.facebook.presto.spi.SystemTable.Distribution.SINGLE_COORDINATOR;
import static com.google.common.collect.Maps.uniqueIndex;
import static java.util.Objects.requireNonNull;
public class SystemSplitManager
implements ConnectorSplitManager
{
private final InternalNodeManager nodeManager;
private final Map<SchemaTableName, SystemTable> tables;
public SystemSplitManager(InternalNodeManager nodeManager, Set<SystemTable> tables)
{
this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
this.tables = uniqueIndex(tables, table -> table.getTableMetadata().getTable());
}
@Override
public ConnectorSplitSource getSplits(ConnectorTransactionHandle transactionHandle, ConnectorSession session, ConnectorTableLayoutHandle layout)
{
SystemTableLayoutHandle layoutHandle = (SystemTableLayoutHandle) layout;
SystemTableHandle tableHandle = layoutHandle.getTable();
TupleDomain<ColumnHandle> constraint = layoutHandle.getConstraint();
SystemTable systemTable = tables.get(tableHandle.getSchemaTableName());
Distribution tableDistributionMode = systemTable.getDistribution();
if (tableDistributionMode == SINGLE_COORDINATOR) {
HostAddress address = nodeManager.getCurrentNode().getHostAndPort();
ConnectorSplit split = new SystemSplit(tableHandle.getConnectorId(), tableHandle, address, constraint);
return new FixedSplitSource(ImmutableList.of(split));
}
ImmutableList.Builder<ConnectorSplit> splits = ImmutableList.builder();
ImmutableSet.Builder<Node> nodes = ImmutableSet.builder();
if (tableDistributionMode == ALL_COORDINATORS) {
nodes.addAll(nodeManager.getCoordinators());
}
else if (tableDistributionMode == ALL_NODES) {
nodes.addAll(nodeManager.getNodes(ACTIVE));
}
Set<Node> nodeSet = nodes.build();
for (Node node : nodeSet) {
splits.add(new SystemSplit(tableHandle.getConnectorId(), tableHandle, node.getHostAndPort(), constraint));
}
return new FixedSplitSource(splits.build());
}
}