spring-data-redis TransactionResultConverter 源码
spring-data-redis TransactionResultConverter 代码
文件路径：/src/main/java/org/springframework/data/redis/connection/convert/TransactionResultConverter.java
/*
* Copyright 2013-2022 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.data.redis.connection.convert;
import java.util.ArrayList;
import java.util.List;
import java.util.Queue;
import org.springframework.core.convert.converter.Converter;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.RedisSystemException;
import org.springframework.data.redis.connection.FutureResult;
/**
* Converts the results of transaction exec using a supplied Queue of {@link FutureResult}s. Converts any Exception
* objects returned in the list as well, using the supplied Exception {@link Converter}
*
* @author Jennifer Hickey
* @author Christoph Strobl
* @author Mark Paluch
* @param <T> The type of {@link FutureResult} of the individual tx operations
*/
public class TransactionResultConverter<T> implements Converter<List<Object>, List<Object>> {
private final Queue<FutureResult<T>> txResults;
private final Converter<Exception, DataAccessException> exceptionConverter;
public TransactionResultConverter(Queue<FutureResult<T>> txResults,
Converter<Exception, DataAccessException> exceptionConverter) {
this.txResults = txResults;
this.exceptionConverter = exceptionConverter;
}
@Override
public List<Object> convert(List<Object> execResults) {
if (execResults.size() != txResults.size()) {
throw new IllegalArgumentException(
"Incorrect number of transaction results; Expected: " + txResults.size() + " Actual: " + execResults.size());
}
List<Object> convertedResults = new ArrayList<>();
for (Object result : execResults) {
FutureResult<T> futureResult = txResults.remove();
if (result instanceof Exception) {
Exception source = (Exception) result;
DataAccessException convertedException = exceptionConverter.convert(source);
throw convertedException != null ? convertedException
: new RedisSystemException("Error reading future result", source);
}
if (!(futureResult.isStatus())) {
convertedResults.add(futureResult.conversionRequired() ? futureResult.convert(result) : result);
}
}
return convertedResults;
}
}
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