| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.drill.exec.store.jdbc; |
| |
| import org.apache.drill.common.exceptions.ExecutionSetupException; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.common.types.TypeProtos.MinorType; |
| import org.apache.drill.common.types.Types; |
| import org.apache.drill.exec.ops.ExecutorFragmentContext; |
| import org.apache.drill.exec.physical.impl.BatchCreator; |
| import org.apache.drill.exec.physical.impl.scan.framework.BasicScanFactory; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedReader; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedScanFramework; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedScanFramework.ScanFrameworkBuilder; |
| import org.apache.drill.exec.proto.UserBitShared.UserCredentials; |
| import org.apache.drill.exec.physical.impl.scan.framework.SchemaNegotiator; |
| import org.apache.drill.exec.record.CloseableRecordBatch; |
| import org.apache.drill.exec.record.RecordBatch; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| |
| import java.util.Collections; |
| import java.util.List; |
| |
| import javax.sql.DataSource; |
| |
| public class JdbcScanBatchCreator implements BatchCreator<JdbcSubScan> { |
| |
| @Override |
| public CloseableRecordBatch getBatch(ExecutorFragmentContext context, |
| JdbcSubScan subScan, List<RecordBatch> children) throws ExecutionSetupException { |
| Preconditions.checkArgument(children.isEmpty()); |
| |
| try { |
| ScanFrameworkBuilder builder = createBuilder(context, subScan); |
| return builder.buildScanOperator(context, subScan); |
| } catch (UserException e) { |
| // Rethrow user exceptions directly |
| throw e; |
| } catch (Throwable e) { |
| // Wrap all others |
| throw new ExecutionSetupException(e); |
| } |
| } |
| |
| private ScanFrameworkBuilder createBuilder(ExecutorFragmentContext context, JdbcSubScan subScan) { |
| ScanFrameworkBuilder builder = new ScanFrameworkBuilder(); |
| builder.projection(subScan.getColumns()); |
| builder.setUserName(subScan.getUserName()); |
| JdbcStoragePlugin plugin = subScan.getPlugin(); |
| UserCredentials userCreds = context.getContextInformation().getQueryUserCredentials(); |
| DataSource ds = plugin.getDataSource(userCreds) |
| .orElseThrow(() -> UserException.permissionError().message( |
| "Query user %s could not obtain a connection to %s, missing credentials?", |
| userCreds.getUserName(), |
| plugin.getName() |
| ).build(JdbcStoragePlugin.logger)); |
| |
| List<ManagedReader<SchemaNegotiator>> readers = Collections.singletonList( |
| new JdbcBatchReader(ds, subScan.getSql(), subScan.getColumns()) |
| ); |
| |
| ManagedScanFramework.ReaderFactory readerFactory = new BasicScanFactory(readers.iterator()); |
| builder.setReaderFactory(readerFactory); |
| builder.nullType(Types.optional(MinorType.VARCHAR)); |
| return builder; |
| } |
| } |