Source Code Cross Referenced for RequestContextHolder.java in  » J2EE » spring-framework-2.5 » org » springframework » web » context » request » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.web.context.request 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.web.context.request;
018:
019:        /**
020:         * Holder class to expose the web request in the form of a thread-bound
021:         * {@link RequestAttributes} object.
022:         *
023:         * <p>Use {@link RequestContextListener} or
024:         * {@link org.springframework.web.filter.RequestContextFilter} to expose
025:         * the current web request. Note that
026:         * {@link org.springframework.web.servlet.DispatcherServlet} and
027:         * {@link org.springframework.web.portlet.DispatcherPortlet} already
028:         * expose the current request by default.
029:         *
030:         * @author Juergen Hoeller
031:         * @author Rod Johnson
032:         * @since 2.0
033:         * @see RequestContextListener
034:         * @see org.springframework.web.filter.RequestContextFilter
035:         * @see org.springframework.web.servlet.DispatcherServlet
036:         * @see org.springframework.web.portlet.DispatcherPortlet
037:         */
038:        public abstract class RequestContextHolder {
039:
040:            private static final ThreadLocal requestAttributesHolder = new ThreadLocal();
041:
042:            private static final ThreadLocal inheritableRequestAttributesHolder = new InheritableThreadLocal();
043:
044:            /**
045:             * Reset the RequestAttributes for the current thread.
046:             */
047:            public static void resetRequestAttributes() {
048:                requestAttributesHolder.set(null);
049:                inheritableRequestAttributesHolder.set(null);
050:            }
051:
052:            /**
053:             * Bind the given RequestAttributes to the current thread,
054:             * <i>not</i> exposing it as inheritable for child threads.
055:             * @param attributes the RequestAttributes to expose
056:             * @see #setRequestAttributes(RequestAttributes, boolean)
057:             */
058:            public static void setRequestAttributes(RequestAttributes attributes) {
059:                setRequestAttributes(attributes, false);
060:            }
061:
062:            /**
063:             * Bind the given RequestAttributes to the current thread.
064:             * @param attributes the RequestAttributes to expose
065:             * @param inheritable whether to expose the RequestAttributes as inheritable
066:             * for child threads (using an {@link java.lang.InheritableThreadLocal})
067:             */
068:            public static void setRequestAttributes(
069:                    RequestAttributes attributes, boolean inheritable) {
070:                if (inheritable) {
071:                    inheritableRequestAttributesHolder.set(attributes);
072:                    requestAttributesHolder.set(null);
073:                } else {
074:                    requestAttributesHolder.set(attributes);
075:                    inheritableRequestAttributesHolder.set(null);
076:                }
077:            }
078:
079:            /**
080:             * Return the RequestAttributes currently bound to the thread.
081:             * @return the RequestAttributes currently bound to the thread,
082:             * or <code>null</code> if none bound
083:             */
084:            public static RequestAttributes getRequestAttributes() {
085:                RequestAttributes attributes = (RequestAttributes) requestAttributesHolder
086:                        .get();
087:                if (attributes == null) {
088:                    attributes = (RequestAttributes) inheritableRequestAttributesHolder
089:                            .get();
090:                }
091:                return attributes;
092:            }
093:
094:            /**
095:             * Return the RequestAttributes currently bound to the thread.
096:             * @return the RequestAttributes currently bound to the thread
097:             * @throws IllegalStateException if no RequestAttributes object
098:             * is bound to the current thread
099:             */
100:            public static RequestAttributes currentRequestAttributes()
101:                    throws IllegalStateException {
102:                RequestAttributes attributes = getRequestAttributes();
103:                if (attributes == null) {
104:                    throw new IllegalStateException(
105:                            "No thread-bound request found: "
106:                                    + "Are you referring to request attributes outside of an actual web request? "
107:                                    + "If you are actually operating within a web request and still receive this message,"
108:                                    + "your code is probably running outside of DispatcherServlet/DispatcherPortlet: "
109:                                    + "In this case, use RequestContextListener or RequestContextFilter to expose the current request.");
110:                }
111:                return attributes;
112:            }
113:
114:        }
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