spring-data-redis JedisScriptReturnConverter 源码
spring-data-redis JedisScriptReturnConverter 代码
文件路径：/src/main/java/org/springframework/data/redis/connection/jedis/JedisScriptReturnConverter.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.jedis;
import redis.clients.jedis.util.SafeEncoder;
import java.util.ArrayList;
import java.util.List;
import org.springframework.core.convert.converter.Converter;
import org.springframework.data.redis.connection.ReturnType;
import org.springframework.lang.Nullable;
/**
* Converts the value returned by Jedis script eval to the expected {@link ReturnType}
*
* @author Jennifer Hickey
*/
public class JedisScriptReturnConverter implements Converter<Object, Object> {
private final ReturnType returnType;
public JedisScriptReturnConverter(ReturnType returnType) {
this.returnType = returnType;
}
@SuppressWarnings("unchecked")
public Object convert(@Nullable Object result) {
if (result instanceof String) {
// evalsha converts byte[] to String. Convert back for consistency
return SafeEncoder.encode((String) result);
}
if (returnType == ReturnType.STATUS) {
return JedisConverters.toString((byte[]) result);
}
if (returnType == ReturnType.BOOLEAN) {
// Lua false comes back as a null bulk reply
if (result == null) {
return Boolean.FALSE;
}
return ((Long) result == 1);
}
if (returnType == ReturnType.MULTI) {
List<Object> resultList = (List<Object>) result;
List<Object> convertedResults = new ArrayList<>();
for (Object res : resultList) {
if (res instanceof String) {
// evalsha converts byte[] to String. Convert back for
// consistency
convertedResults.add(SafeEncoder.encode((String) res));
} else {
convertedResults.add(res);
}
}
return convertedResults;
}
return result;
}
}
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