| /** |
| * 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.apex.malhar.lib.io.fs; |
| |
| import java.io.IOException; |
| import java.util.LinkedList; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| |
| import com.google.common.base.Preconditions; |
| |
| import com.datatorrent.api.Context; |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.Operator; |
| |
| /** |
| * A file splitter that receives its input from an upstream operator. |
| * |
| * @since 3.2.0 |
| */ |
| public class FileSplitterBase extends AbstractFileSplitter implements Operator.IdleTimeHandler |
| { |
| @NotNull |
| protected String file; |
| protected transient FileSystem fs; |
| |
| protected final LinkedList<FileInfo> fileInfos; |
| protected transient int sleepTimeMillis; |
| |
| public FileSplitterBase() |
| { |
| fileInfos = new LinkedList<>(); |
| } |
| |
| public final transient DefaultInputPort<FileInfo> input = new DefaultInputPort<FileInfo>() |
| { |
| @Override |
| public void process(FileInfo fileInfo) |
| { |
| fileInfos.add(fileInfo); |
| FileSplitterBase.this.process(); |
| } |
| }; |
| |
| @Override |
| public void setup(Context.OperatorContext context) |
| { |
| sleepTimeMillis = context.getValue(Context.OperatorContext.SPIN_MILLIS); |
| try { |
| fs = getFSInstance(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| super.setup(context); |
| } |
| |
| protected FileSystem getFSInstance() throws IOException |
| { |
| return FileSystem.newInstance(new Path(file).toUri(), new Configuration()); |
| } |
| |
| @Override |
| protected FileInfo getFileInfo() |
| { |
| if (fileInfos.size() > 0) { |
| return fileInfos.remove(); |
| } |
| return null; |
| } |
| |
| @Override |
| public void handleIdleTime() |
| { |
| if (blockCount < blocksThreshold && (blockMetadataIterator != null || fileInfos.size() > 0)) { |
| process(); |
| } else { |
| /* nothing to do here, so sleep for a while to avoid busy loop */ |
| try { |
| Thread.sleep(sleepTimeMillis); |
| } catch (InterruptedException ie) { |
| throw new RuntimeException(ie); |
| } |
| } |
| } |
| |
| @Override |
| public void teardown() |
| { |
| super.teardown(); |
| try { |
| fs.close(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| protected long getDefaultBlockSize() |
| { |
| return fs.getDefaultBlockSize(new Path(file)); |
| } |
| |
| @Override |
| protected FileStatus getFileStatus(Path path) throws IOException |
| { |
| return fs.getFileStatus(path); |
| } |
| |
| /** |
| * File path from which the File System is inferred. |
| * |
| * @param file files |
| */ |
| public void setFile(@NotNull String file) |
| { |
| this.file = Preconditions.checkNotNull(file, "file path"); |
| } |
| |
| /** |
| * @return file path from which the File System is inferred. |
| */ |
| public String getFile() |
| { |
| return file; |
| } |
| } |