spring-batch ExceptionThrowingItemReaderProxy 源码
spring-batch ExceptionThrowingItemReaderProxy 代码
文件路径：/spring-batch-samples/src/main/java/org/springframework/batch/sample/support/ExceptionThrowingItemReaderProxy.java
/*
* Copyright 2006-2019 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.sample.support;
import org.springframework.batch.core.UnexpectedJobExecutionException;
import org.springframework.batch.item.ItemReader;
import org.springframework.lang.Nullable;
/**
* Hacked {@link ItemReader} that throws exception on a given record number (useful for
* testing restart).
*
* @author Robert Kasanicky
* @author Lucas Ward
*
*/
public class ExceptionThrowingItemReaderProxy<T> implements ItemReader<T> {
private int counter = 0;
private int throwExceptionOnRecordNumber = 4;
private ItemReader<T> delegate;
/**
* @param throwExceptionOnRecordNumber The number of record on which exception should
* be thrown
*/
public void setThrowExceptionOnRecordNumber(int throwExceptionOnRecordNumber) {
this.throwExceptionOnRecordNumber = throwExceptionOnRecordNumber;
}
@Nullable
@Override
public T read() throws Exception {
counter++;
if (counter == throwExceptionOnRecordNumber) {
throw new UnexpectedJobExecutionException("Planned failure on count=" + counter);
}
return delegate.read();
}
public void setDelegate(ItemReader<T> delegate) {
this.delegate = delegate;
}
}
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