| /** |
| * 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.mrql; |
| |
| import org.apache.mrql.gen.*; |
| import java.io.*; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.flink.api.common.io.FileInputFormat; |
| import org.apache.flink.core.fs.FileInputSplit; |
| |
| |
| /** A superclass for all MRQL FileInputFormats */ |
| abstract public class FlinkMRQLFileInputFormat implements MRQLFileInputFormat { |
| public FlinkMRQLFileInputFormat () {} |
| |
| private static DataSource read_directory ( String buffer ) { |
| try { |
| String[] s = buffer.split(DataSource.separator); |
| int n = Integer.parseInt(s[1]); |
| if (s[0].equals("Binary")) |
| return new BinaryDataSource(s[2],Plan.conf); |
| else if (s[0].equals("Generator")) |
| return new GeneratorDataSource(s[2],Plan.conf); |
| else if (s[0].equals("Text")) |
| return new FlinkParsedDataSource(s[3],DataSource.parserDirectory.get(s[2]), |
| ((Node)Tree.parse(s[4])).children()); |
| else throw new Error("Unrecognized data source: "+s[0]); |
| } catch (Exception e) { |
| throw new Error(e); |
| } |
| } |
| |
| /** encode the data source directory (to be serialized and distributed to clients) */ |
| public static String encode_data_sources () { |
| return DataSource.dataSourceDirectory.toString(); |
| } |
| |
| /** restore the data source directory */ |
| public static void restore_data_sources ( String data_sources ) { |
| if (Config.local_mode) |
| return; |
| DataSource.parserDirectory = new DataSource.ParserDirectory(); |
| DataSource.parserDirectory.put("xml",FlinkXMLParser.class); |
| DataSource.parserDirectory.put("json",FlinkJsonParser.class); |
| DataSource.parserDirectory.put("line",FlinkLineParser.class); |
| DataSource.dataSourceDirectory = new DataSource.DataSourceDirectory(); |
| for ( String s: data_sources.split("@@@") ) { |
| String[] p = s.split("==="); |
| DataSource.dataSourceDirectory.put(p[0],read_directory(p[1])); |
| } |
| } |
| |
| /** the Flink input format for this input */ |
| abstract public FileInputFormat<FData> inputFormat ( String path ); |
| |
| /** materialize the input file into a memory Bag |
| * @param path the path directory |
| * @return a Bag that contains all data |
| */ |
| public Bag materialize ( final Path path ) throws IOException { |
| final FileInputFormat<FData> sf = inputFormat(path.toString()); |
| final FileInputSplit[] splits = sf.createInputSplits(1); |
| if (splits.length == 0) |
| return new Bag(); |
| sf.open(splits[0]); |
| return new Bag(new BagIterator () { |
| int i = 0; |
| FData d = new FData(); |
| public boolean hasNext () { |
| try { |
| while (sf.reachedEnd() && ++i < splits.length) { |
| sf.close(); |
| sf.open(splits[i]); |
| }; |
| return i < splits.length; |
| } catch (IOException ex) { |
| throw new Error("Cannot materialize a flink data source into a bag: "+ex); |
| } |
| } |
| public MRData next () { |
| try { |
| return sf.nextRecord(d).data(); |
| } catch (IOException ex) { |
| throw new Error("Cannot materialize a flink data source into a bag: "+ex); |
| } |
| } |
| }); |
| } |
| |
| /** materialize the entire dataset into a Bag |
| * @param x the DataSet in HDFS to collect values from |
| * @param strip is not used in MapReduce mode |
| * @return the Bag that contains the collected values |
| */ |
| public final Bag collect ( final DataSet x, boolean strip ) throws Exception { |
| Bag res = new Bag(); |
| for ( DataSource s: x.source ) |
| if (s.to_be_merged) |
| res = res.union(((FlinkDataSource)s).merge()); |
| else res = res.union(s.inputFormat.newInstance().materialize(new Path(s.path))); |
| return res; |
| } |
| } |