| /* |
| * 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.splunk; |
| |
| 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.ManagedReader; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedScanFramework; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedScanFramework.ReaderFactory; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedScanFramework.ScanFrameworkBuilder; |
| 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.exec.server.options.OptionManager; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| |
| import java.util.List; |
| |
| public class SplunkScanBatchCreator implements BatchCreator<SplunkSubScan> { |
| |
| @Override |
| public CloseableRecordBatch getBatch(ExecutorFragmentContext context, |
| SplunkSubScan subScan, List<RecordBatch> children) throws ExecutionSetupException { |
| Preconditions.checkArgument(children.isEmpty()); |
| |
| try { |
| ScanFrameworkBuilder builder = createBuilder(context.getOptions(), 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(OptionManager options, SplunkSubScan subScan) { |
| SplunkPluginConfig config = subScan.getConfig(); |
| ScanFrameworkBuilder builder = new ScanFrameworkBuilder(); |
| builder.projection(subScan.getColumns()); |
| builder.setUserName(subScan.getUserName()); |
| |
| // Reader |
| ReaderFactory readerFactory = new SplunkReaderFactory(config, subScan); |
| builder.setReaderFactory(readerFactory); |
| builder.nullType(Types.optional(MinorType.VARCHAR)); |
| return builder; |
| } |
| |
| private static class SplunkReaderFactory implements ReaderFactory { |
| |
| private final SplunkPluginConfig config; |
| private final SplunkSubScan subScan; |
| private int count; |
| |
| public SplunkReaderFactory(SplunkPluginConfig config, SplunkSubScan subScan) { |
| this.config = config; |
| this.subScan = subScan; |
| } |
| |
| @Override |
| public void bind(ManagedScanFramework framework) { |
| } |
| |
| @Override |
| public ManagedReader<SchemaNegotiator> next() { |
| // Only a single scan (in a single thread) |
| if (count++ == 0) { |
| return new SplunkBatchReader(config, subScan); |
| } |
| return null; |
| } |
| } |
| } |