001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.storage.local;
020
021import org.apache.reef.exception.evaluator.ServiceRuntimeException;
022import org.apache.reef.exception.evaluator.StorageException;
023import org.apache.reef.io.serialization.Codec;
024
025import java.io.File;
026import java.io.IOException;
027import java.util.Iterator;
028
029/**
030 * A read-only spool implementation, based on files. Some other process needs to
031 * create the spool file for us.
032 */
033public class CodecFileIterable<T, C extends Codec<T>> implements Iterable<T> {
034  private final File filename;
035  private final C codec;
036
037  public CodecFileIterable(final File filename, final C codec) {
038    this.filename = filename;
039    this.codec = codec;
040  }
041
042  @SuppressWarnings("resource")
043  @Override
044  public Iterator<T> iterator() {
045    try {
046      return new CodecFileIterator<>(this.codec, this.filename);
047    } catch (final IOException e) {
048      throw new ServiceRuntimeException(new StorageException(e));
049    }
050  }
051
052
053}