spring-batch PeekableItemReader 源码
spring-batch PeekableItemReader 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/item/PeekableItemReader.java
/*
* Copyright 2006-2018 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.batch.item;
import org.springframework.lang.Nullable;
/**
* <p>
* A specialisation of {@link ItemReader} that allows the user to look ahead into the
* stream of items. This is useful, for instance, when reading flat file data that
* contains record separator lines which are actually part of the next record.
* </p>
*
* <p>
* The detailed contract for {@link #peek()} has to be defined by the implementation
* because there is no general way to define it in a concurrent environment. The
* definition of "the next read()" operation is tenuous if multiple clients are reading
* concurrently, and the ability to peek implies that some state is likely to be stored,
* so implementations of {@link PeekableItemReader} may well be restricted to single
* threaded use.
* </p>
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
*
*/
public interface PeekableItemReader<T> extends ItemReader<T> {
/**
* Get the next item that would be returned by {@link #read()}, without affecting the
* result of {@link #read()}.
* @return the next item or {@code null} if the data source is exhausted
* @throws Exception if there is a problem
*/
@Nullable
T peek() throws Exception, UnexpectedInputException, ParseException;
}
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