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Spring Framework example source code file (RequestAttributes.java)

This example Spring Framework source code file (RequestAttributes.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

object, object, requestattributes, runnable, scope_global_session, scope_request, scope_request, scope_session, scope_session, string, string

The Spring Framework RequestAttributes.java source code

/*
 * Copyright 2002-2007 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.web.context.request;

/**
 * Abstraction for accessing attribute objects associated with a request.
 * Supports access to request-scoped attributes as well as to session-scoped
 * attributes, with the optional notion of a "global session".
 *
 * <p>Can be implemented for any kind of request/session mechanism,
 * in particular for servlet requests and portlet requests.
 *
 * @author Juergen Hoeller
 * @since 2.0
 * @see ServletRequestAttributes
 * @see org.springframework.web.portlet.context.PortletRequestAttributes
 */
public interface RequestAttributes {

	/**
	 * Constant that indicates request scope.
	 */
	int SCOPE_REQUEST = 0;

	/**
	 * Constant that indicates session scope.
	 * <p>This preferably refers to a locally isolated session, if such
	 * a distinction is available (for example, in a Portlet environment).
	 * Else, it simply refers to the common session.
	 */
	int SCOPE_SESSION = 1;

	/**
	 * Constant that indicates global session scope.
	 * <p>This explicitly refers to a globally shared session, if such
	 * a distinction is available (for example, in a Portlet environment).
	 * Else, it simply refers to the common session.
	 */
	int SCOPE_GLOBAL_SESSION = 2;


	/**
	 * Return the value for the scoped attribute of the given name, if any.
	 * @param name the name of the attribute
	 * @param scope the scope identifier
	 * @return the current attribute value, or <code>null if not found
	 */
	Object getAttribute(String name, int scope);

	/**
	 * Set the value for the scoped attribute of the given name,
	 * replacing an existing value (if any).
	 * @param name the name of the attribute
	 * @param scope the scope identifier
	 * @param value the value for the attribute
	 */
	void setAttribute(String name, Object value, int scope);

	/**
	 * Remove the scoped attribute of the given name, if it exists.
	 * <p>Note that an implementation should also remove a registered destruction
	 * callback for the specified attribute, if any. It does, however, <i>not
	 * need to <i>execute a registered destruction callback in this case,
	 * since the object will be destroyed by the caller (if appropriate).
	 * @param name the name of the attribute
	 * @param scope the scope identifier
	 */
	void removeAttribute(String name, int scope);

	/**
	 * Retrieve the names of all attributes in the scope.
	 * @param scope the scope identifier
	 * @return the attribute names as String array
	 */
	String[] getAttributeNames(int scope);

	/**
	 * Register a callback to be executed on destruction of the
	 * specified attribute in the given scope.
	 * <p>Implementations should do their best to execute the callback
	 * at the appropriate time: that is, at request completion or session
	 * termination, respectively. If such a callback is not supported by the
	 * underlying runtime environment, the callback <i>must be ignored
	 * and a corresponding warning should be logged.
	 * <p>Note that 'destruction' usually corresponds to destruction of the
	 * entire scope, not to the individual attribute having been explicitly
	 * removed by the application. If an attribute gets removed via this
	 * facade's {@link #removeAttribute(String, int)} method, any registered
	 * destruction callback should be disabled as well, assuming that the
	 * removed object will be reused or manually destroyed.
	 * @param name the name of the attribute to register the callback for
	 * @param callback the destruction callback to be executed
	 * @param scope the scope identifier
	 */
	void registerDestructionCallback(String name, Runnable callback, int scope);

	/**
	 * Return an id for the current underlying session.
	 * @return the session id as String (never <code>null
	 */
	String getSessionId();

	/**
	 * Expose the best available mutex for the underlying session:
	 * that is, an object to synchronize on for the underlying session.
	 * @return the session mutex to use (never <code>null
	 */
	Object getSessionMutex();

}

Other Spring Framework examples (source code examples)

Here is a short list of links related to this Spring Framework RequestAttributes.java source code file:



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