spring security UserCache 源码
spring security UserCache 代码
文件路径：/core/src/main/java/org/springframework/security/core/userdetails/UserCache.java
/*
* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
*
* 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.core.userdetails;
/**
* Provides a cache of {@link UserDetails} objects.
*
* <p>
* Implementations should provide appropriate methods to set their cache parameters (e.g.
* time-to-live) and/or force removal of entities before their normal expiration. These
* are not part of the <code>UserCache</code> interface contract because they vary
* depending on the type of caching system used (in-memory, disk, cluster, hybrid etc.).
* <p>
* Caching is generally only required in applications which do not maintain server-side
* state, such as remote clients or web services. The authentication credentials are then
* presented on each invocation and the overhead of accessing a database or other
* persistent storage mechanism to validate would be excessive. In this case, you would
* configure a cache to store the <tt>UserDetails</tt> information rather than loading it
* each time.
*
* @author Ben Alex
* @see org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider
*/
public interface UserCache {
/**
* Obtains a {@link UserDetails} from the cache.
* @param username the {@link User#getUsername()} used to place the user in the cache
* @return the populated <code>UserDetails</code> or <code>null</code> if the user
* could not be found or if the cache entry has expired
*/
UserDetails getUserFromCache(String username);
/**
* Places a {@link UserDetails} in the cache. The <code>username</code> is the key
* used to subsequently retrieve the <code>UserDetails</code>.
* @param user the fully populated <code>UserDetails</code> to place in the cache
*/
void putUserInCache(UserDetails user);
/**
* Removes the specified user from the cache. The <code>username</code> is the key
* used to remove the user. If the user is not found, the method should simply return
* (not thrown an exception).
* <p>
* Some cache implementations may not support eviction from the cache, in which case
* they should provide appropriate behaviour to alter the user in either its
* documentation, via an exception, or through a log message.
* @param username to be evicted from the cache
*/
void removeUserFromCache(String username);
}
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