spring security CachingUserDetailsService 源码
spring security CachingUserDetailsService 代码
文件路径：/core/src/main/java/org/springframework/security/authentication/CachingUserDetailsService.java
/*
* Copyright 2002-2018 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.security.authentication;
import org.springframework.security.core.userdetails.UserCache;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.cache.NullUserCache;
import org.springframework.util.Assert;
/**
* @author Luke Taylor
* @since 2.0
*/
public class CachingUserDetailsService implements UserDetailsService {
private UserCache userCache = new NullUserCache();
private final UserDetailsService delegate;
public CachingUserDetailsService(UserDetailsService delegate) {
this.delegate = delegate;
}
public UserCache getUserCache() {
return this.userCache;
}
public void setUserCache(UserCache userCache) {
this.userCache = userCache;
}
@Override
public UserDetails loadUserByUsername(String username) {
UserDetails user = this.userCache.getUserFromCache(username);
if (user == null) {
user = this.delegate.loadUserByUsername(username);
}
Assert.notNull(user, () -> "UserDetailsService " + this.delegate + " returned null for username " + username
+ ". " + "This is an interface contract violation");
this.userCache.putUserInCache(user);
return user;
}
}
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