spring security ThreadLocalSecurityContextHolderStrategy 源码
spring security ThreadLocalSecurityContextHolderStrategy 代码
文件路径：/core/src/main/java/org/springframework/security/core/context/ThreadLocalSecurityContextHolderStrategy.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.context;
import java.util.function.Supplier;
import org.springframework.util.Assert;
/**
* A <code>ThreadLocal</code>-based implementation of
* {@link SecurityContextHolderStrategy}.
*
* @author Ben Alex
* @author Rob Winch
* @see java.lang.ThreadLocal
* @see org.springframework.security.core.context.web.SecurityContextPersistenceFilter
*/
final class ThreadLocalSecurityContextHolderStrategy implements SecurityContextHolderStrategy {
private static final ThreadLocal<Supplier<SecurityContext>> contextHolder = new ThreadLocal<>();
@Override
public void clearContext() {
contextHolder.remove();
}
@Override
public SecurityContext getContext() {
return getDeferredContext().get();
}
@Override
public Supplier<SecurityContext> getDeferredContext() {
Supplier<SecurityContext> result = contextHolder.get();
if (result == null) {
SecurityContext context = createEmptyContext();
result = () -> context;
contextHolder.set(result);
}
return result;
}
@Override
public void setContext(SecurityContext context) {
Assert.notNull(context, "Only non-null SecurityContext instances are permitted");
contextHolder.set(() -> context);
}
@Override
public void setDeferredContext(Supplier<SecurityContext> deferredContext) {
Assert.notNull(deferredContext, "Only non-null Supplier instances are permitted");
Supplier<SecurityContext> notNullDeferredContext = () -> {
SecurityContext result = deferredContext.get();
Assert.notNull(result, "A Supplier<SecurityContext> returned null and is not allowed.");
return result;
};
contextHolder.set(notNullDeferredContext);
}
@Override
public SecurityContext createEmptyContext() {
return new SecurityContextImpl();
}
}
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