/*
* 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.AllNodes;
import com.facebook.presto.metadata.InternalNodeManager;
import com.facebook.presto.metadata.PrestoNode;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.ConnectorTableMetadata;
import com.facebook.presto.spi.InMemoryRecordSet;
import com.facebook.presto.spi.InMemoryRecordSet.Builder;
import com.facebook.presto.spi.Node;
import com.facebook.presto.spi.NodeState;
import com.facebook.presto.spi.RecordCursor;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.SystemTable;
import com.facebook.presto.spi.connector.ConnectorTransactionHandle;
import com.facebook.presto.spi.predicate.TupleDomain;
import javax.inject.Inject;
import java.util.Set;
import static com.facebook.presto.metadata.MetadataUtil.TableMetadataBuilder.tableMetadataBuilder;
import static com.facebook.presto.spi.NodeState.ACTIVE;
import static com.facebook.presto.spi.NodeState.INACTIVE;
import static com.facebook.presto.spi.NodeState.SHUTTING_DOWN;
import static com.facebook.presto.spi.SystemTable.Distribution.SINGLE_COORDINATOR;
import static com.facebook.presto.spi.type.BooleanType.BOOLEAN;
import static com.facebook.presto.spi.type.VarcharType.createUnboundedVarcharType;
import static java.util.Objects.requireNonNull;
public class NodeSystemTable
implements SystemTable
{
public static final SchemaTableName NODES_TABLE_NAME = new SchemaTableName("runtime", "nodes");
public static final ConnectorTableMetadata NODES_TABLE = tableMetadataBuilder(NODES_TABLE_NAME)
.column("node_id", createUnboundedVarcharType())
.column("http_uri", createUnboundedVarcharType())
.column("node_version", createUnboundedVarcharType())
.column("coordinator", BOOLEAN)
.column("state", createUnboundedVarcharType())
.build();
private final InternalNodeManager nodeManager;
@Inject
public NodeSystemTable(InternalNodeManager nodeManager)
{
this.nodeManager = requireNonNull(nodeManager, "nodeManager is null");
}
@Override
public Distribution getDistribution()
{
return SINGLE_COORDINATOR;
}
@Override
public ConnectorTableMetadata getTableMetadata()
{
return NODES_TABLE;
}
@Override
public RecordCursor cursor(ConnectorTransactionHandle transactionHandle, ConnectorSession session, TupleDomain<Integer> constraint)
{
Builder table = InMemoryRecordSet.builder(NODES_TABLE);
AllNodes allNodes = nodeManager.getAllNodes();
addRows(table, allNodes.getActiveNodes(), ACTIVE);
addRows(table, allNodes.getInactiveNodes(), INACTIVE);
addRows(table, allNodes.getShuttingDownNodes(), SHUTTING_DOWN);
return table.build().cursor();
}
private void addRows(Builder table, Set<Node> nodes, NodeState state)
{
for (Node node : nodes) {
table.addRow(node.getNodeIdentifier(), node.getHttpUri().toString(), getNodeVersion(node), isCoordinator(node), state.toString().toLowerCase());
}
}
private static String getNodeVersion(Node node)
{
if (node instanceof PrestoNode) {
return ((PrestoNode) node).getNodeVersion().toString();
}
return "";
}
private boolean isCoordinator(Node node)
{
return nodeManager.getCoordinators().contains(node);
}
}