spring-data-redis CollectionUtils 源码
spring-data-redis CollectionUtils 代码
文件路径：/src/main/java/org/springframework/data/redis/support/collections/CollectionUtils.java
/*
* Copyright 2011-2022 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.support.collections;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.springframework.dao.DataAccessException;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.SessionCallback;
/**
* Utility class used mainly for type conversion by the default collection implementations. Meant for internal use.
*
* @author Costin Leau
*/
abstract class CollectionUtils {
@SuppressWarnings("unchecked")
static <E> Collection<E> reverse(Collection<? extends E> c) {
Object[] reverse = new Object[c.size()];
int index = c.size();
for (E e : c) {
reverse[--index] = e;
}
return (List<E>) Arrays.asList(reverse);
}
static Collection<String> extractKeys(Collection<? extends RedisStore> stores) {
Collection<String> keys = new ArrayList<>(stores.size());
for (RedisStore store : stores) {
keys.add(store.getKey());
}
return keys;
}
static <K> void rename(final K key, final K newKey, RedisOperations<K, ?> operations) {
operations.execute(new SessionCallback<Object>() {
@SuppressWarnings("unchecked")
public Object execute(RedisOperations operations) throws DataAccessException {
do {
operations.watch(key);
if (operations.hasKey(key)) {
operations.multi();
operations.rename(key, newKey);
} else {
operations.multi();
}
} while (operations.exec() == null);
return null;
}
});
}
}
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