/*
* 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.kafka;
import com.facebook.presto.decoder.dummy.DummyRowDecoder;
import com.facebook.presto.spi.ColumnHandle;
import com.facebook.presto.spi.ColumnMetadata;
import com.facebook.presto.spi.ConnectorSession;
import com.facebook.presto.spi.ConnectorTableHandle;
import com.facebook.presto.spi.ConnectorTableLayout;
import com.facebook.presto.spi.ConnectorTableLayoutHandle;
import com.facebook.presto.spi.ConnectorTableLayoutResult;
import com.facebook.presto.spi.ConnectorTableMetadata;
import com.facebook.presto.spi.Constraint;
import com.facebook.presto.spi.SchemaTableName;
import com.facebook.presto.spi.SchemaTablePrefix;
import com.facebook.presto.spi.TableNotFoundException;
import com.facebook.presto.spi.connector.ConnectorMetadata;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import javax.inject.Inject;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Supplier;
import static com.facebook.presto.kafka.KafkaHandleResolver.convertColumnHandle;
import static com.facebook.presto.kafka.KafkaHandleResolver.convertTableHandle;
import static java.util.Objects.requireNonNull;
/**
* Manages the Kafka connector specific metadata information. The Connector provides an additional set of columns
* for each table that are created as hidden columns. See {@link KafkaInternalFieldDescription} for a list
* of per-topic additional columns.
*/
public class KafkaMetadata
implements ConnectorMetadata
{
private final String connectorId;
private final boolean hideInternalColumns;
private final Map<SchemaTableName, KafkaTopicDescription> tableDescriptions;
private final Set<KafkaInternalFieldDescription> internalFieldDescriptions;
@Inject
public KafkaMetadata(
KafkaConnectorId connectorId,
KafkaConnectorConfig kafkaConnectorConfig,
Supplier<Map<SchemaTableName, KafkaTopicDescription>> kafkaTableDescriptionSupplier,
Set<KafkaInternalFieldDescription> internalFieldDescriptions)
{
this.connectorId = requireNonNull(connectorId, "connectorId is null").toString();
requireNonNull(kafkaConnectorConfig, "kafkaConfig is null");
this.hideInternalColumns = kafkaConnectorConfig.isHideInternalColumns();
requireNonNull(kafkaTableDescriptionSupplier, "kafkaTableDescriptionSupplier is null");
this.tableDescriptions = kafkaTableDescriptionSupplier.get();
this.internalFieldDescriptions = requireNonNull(internalFieldDescriptions, "internalFieldDescriptions is null");
}
@Override
public List<String> listSchemaNames(ConnectorSession session)
{
ImmutableSet.Builder<String> builder = ImmutableSet.builder();
for (SchemaTableName tableName : tableDescriptions.keySet()) {
builder.add(tableName.getSchemaName());
}
return ImmutableList.copyOf(builder.build());
}
@Override
public KafkaTableHandle getTableHandle(ConnectorSession session, SchemaTableName schemaTableName)
{
KafkaTopicDescription table = tableDescriptions.get(schemaTableName);
if (table == null) {
return null;
}
return new KafkaTableHandle(connectorId,
schemaTableName.getSchemaName(),
schemaTableName.getTableName(),
table.getTopicName(),
getDataFormat(table.getKey()),
getDataFormat(table.getMessage()));
}
private static String getDataFormat(KafkaTopicFieldGroup fieldGroup)
{
return (fieldGroup == null) ? DummyRowDecoder.NAME : fieldGroup.getDataFormat();
}
@Override
public ConnectorTableMetadata getTableMetadata(ConnectorSession session, ConnectorTableHandle tableHandle)
{
return getTableMetadata(convertTableHandle(tableHandle).toSchemaTableName());
}
@Override
public List<SchemaTableName> listTables(ConnectorSession session, String schemaNameOrNull)
{
ImmutableList.Builder<SchemaTableName> builder = ImmutableList.builder();
for (SchemaTableName tableName : tableDescriptions.keySet()) {
if (schemaNameOrNull == null || tableName.getSchemaName().equals(schemaNameOrNull)) {
builder.add(tableName);
}
}
return builder.build();
}
@SuppressWarnings("ValueOfIncrementOrDecrementUsed")
@Override
public Map<String, ColumnHandle> getColumnHandles(ConnectorSession session, ConnectorTableHandle tableHandle)
{
KafkaTableHandle kafkaTableHandle = convertTableHandle(tableHandle);
KafkaTopicDescription kafkaTopicDescription = tableDescriptions.get(kafkaTableHandle.toSchemaTableName());
if (kafkaTopicDescription == null) {
throw new TableNotFoundException(kafkaTableHandle.toSchemaTableName());
}
ImmutableMap.Builder<String, ColumnHandle> columnHandles = ImmutableMap.builder();
int index = 0;
KafkaTopicFieldGroup key = kafkaTopicDescription.getKey();
if (key != null) {
List<KafkaTopicFieldDescription> fields = key.getFields();
if (fields != null) {
for (KafkaTopicFieldDescription kafkaTopicFieldDescription : fields) {
columnHandles.put(kafkaTopicFieldDescription.getName(), kafkaTopicFieldDescription.getColumnHandle(connectorId, true, index++));
}
}
}
KafkaTopicFieldGroup message = kafkaTopicDescription.getMessage();
if (message != null) {
List<KafkaTopicFieldDescription> fields = message.getFields();
if (fields != null) {
for (KafkaTopicFieldDescription kafkaTopicFieldDescription : fields) {
columnHandles.put(kafkaTopicFieldDescription.getName(), kafkaTopicFieldDescription.getColumnHandle(connectorId, false, index++));
}
}
}
for (KafkaInternalFieldDescription kafkaInternalFieldDescription : internalFieldDescriptions) {
columnHandles.put(kafkaInternalFieldDescription.getName(), kafkaInternalFieldDescription.getColumnHandle(connectorId, index++, hideInternalColumns));
}
return columnHandles.build();
}
@Override
public Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix)
{
requireNonNull(prefix, "prefix is null");
ImmutableMap.Builder<SchemaTableName, List<ColumnMetadata>> columns = ImmutableMap.builder();
List<SchemaTableName> tableNames = prefix.getSchemaName() == null ? listTables(session, null) : ImmutableList.of(new SchemaTableName(prefix.getSchemaName(), prefix.getTableName()));
for (SchemaTableName tableName : tableNames) {
ConnectorTableMetadata tableMetadata = getTableMetadata(tableName);
// table can disappear during listing operation
if (tableMetadata != null) {
columns.put(tableName, tableMetadata.getColumns());
}
}
return columns.build();
}
@Override
public ColumnMetadata getColumnMetadata(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle columnHandle)
{
convertTableHandle(tableHandle);
return convertColumnHandle(columnHandle).getColumnMetadata();
}
@Override
public List<ConnectorTableLayoutResult> getTableLayouts(ConnectorSession session, ConnectorTableHandle table, Constraint<ColumnHandle> constraint, Optional<Set<ColumnHandle>> desiredColumns)
{
KafkaTableHandle handle = convertTableHandle(table);
ConnectorTableLayout layout = new ConnectorTableLayout(new KafkaTableLayoutHandle(handle));
return ImmutableList.of(new ConnectorTableLayoutResult(layout, constraint.getSummary()));
}
@Override
public ConnectorTableLayout getTableLayout(ConnectorSession session, ConnectorTableLayoutHandle handle)
{
return new ConnectorTableLayout(handle);
}
@SuppressWarnings("ValueOfIncrementOrDecrementUsed")
private ConnectorTableMetadata getTableMetadata(SchemaTableName schemaTableName)
{
KafkaTopicDescription table = tableDescriptions.get(schemaTableName);
if (table == null) {
throw new TableNotFoundException(schemaTableName);
}
ImmutableList.Builder<ColumnMetadata> builder = ImmutableList.builder();
KafkaTopicFieldGroup key = table.getKey();
if (key != null) {
List<KafkaTopicFieldDescription> fields = key.getFields();
if (fields != null) {
for (KafkaTopicFieldDescription fieldDescription : fields) {
builder.add(fieldDescription.getColumnMetadata());
}
}
}
KafkaTopicFieldGroup message = table.getMessage();
if (message != null) {
List<KafkaTopicFieldDescription> fields = message.getFields();
if (fields != null) {
for (KafkaTopicFieldDescription fieldDescription : fields) {
builder.add(fieldDescription.getColumnMetadata());
}
}
}
for (KafkaInternalFieldDescription fieldDescription : internalFieldDescriptions) {
builder.add(fieldDescription.getColumnMetadata(hideInternalColumns));
}
return new ConnectorTableMetadata(schemaTableName, builder.build());
}
}