| /* |
| * 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.batchee.extras.transaction; |
| |
| import javax.batch.api.chunk.ItemReader; |
| import java.io.Serializable; |
| |
| public abstract class CountedReader implements ItemReader { |
| protected long items = 0; |
| |
| protected void incrementReaderCount() { |
| incrementCount(1); |
| } |
| |
| protected void incrementCount(int number) { |
| items += number; |
| } |
| |
| @Override |
| public void open(final Serializable checkpoint) throws Exception { |
| if (checkpoint != null && Number.class.isInstance(checkpoint)) { |
| items = Number.class.cast(checkpoint).longValue(); |
| if (items > 0) { |
| int i = 0; |
| Object l; |
| do { |
| l = doRead(); |
| i++; |
| } while (l != null && i < items); |
| } |
| } |
| } |
| |
| protected abstract Object doRead() throws Exception; |
| |
| @Override |
| public Object readItem() throws Exception { |
| final Object s = doRead(); |
| if (s != null) { |
| incrementReaderCount(); |
| } |
| return s; |
| } |
| |
| @Override |
| public Serializable checkpointInfo() throws Exception { |
| return items; |
| } |
| } |