org.springframework.webflow.execution.RequestContextHolder Maven / Gradle / Ivy
/*
* Copyright 2004-2012 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
*
* http://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.webflow.execution;
import org.springframework.core.NamedThreadLocal;
/**
* Simple holder class that associates a {@link RequestContext} instance with the current thread. The RequestContext
* will not be inherited by any child threads spawned by the current thread.
*
* Used as a central holder for the current RequestContext in Spring Web Flow, wherever necessary. Often used by
* integration artifacts needing access to the current flow execution.
*
* @see RequestContext
*
* @author Jeremy Grelle
*/
public class RequestContextHolder {
private static final ThreadLocal requestContextHolder = new NamedThreadLocal(
"Flow RequestContext");
/**
* Associate the given RequestContext with the current thread.
* @param requestContext the current RequestContext, or null to reset the thread-bound context
*/
public static void setRequestContext(RequestContext requestContext) {
requestContextHolder.set(requestContext);
}
/**
* Return the RequestContext associated with the current thread, if any.
* @return the current RequestContext
* @throws IllegalStateException if no RequestContext is bound to this thread
*/
public static RequestContext getRequestContext() {
return requestContextHolder.get();
}
// not instantiable
private RequestContextHolder() {
}
}