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}