javax.enterprise.context.ConversationScoped Maven / Gradle / Ivy
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* Copyright 2010, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 javax.enterprise.context;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Documented;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import javax.enterprise.util.AnnotationLiteral;
/**
*
* Specifies that a bean is conversation scoped.
*
*
* While ConversationScoped must be associated with the built-in conversation context required by the specification,
* third-party extensions are
* allowed to also associate it with their own context. Behavior described below is only related to the built-in conversation context.
*
*
* The conversation scope is active:
*
*
* - during all Servlet requests.
*
*
* An event with qualifier @Initialized(ConversationScoped.class) is fired when the conversation context is initialized
* and an event with qualifier @Destroyed(ConversationScoped.class) is fired when the conversation is destroyed.
* The event payload is:
*
*
* - the conversation id if the conversation context is destroyed and is not associated with a current Servlet request, or
* - the ServletRequest if the application is a web application deployed to a Servlet container, or
* - any java.lang.Object for other types of application.
*
*
*
* The conversation context provides access to state associated with a particular conversation. Every Servlet request
* has an associated conversation. This association is managed automatically by the container according to the following rules:
*
*
*
* - Any Servlet request has exactly one associated conversation.
* - The container provides a filter with the name "CDI Conversation Filter", which may be mapped in web.xml,
* allowing the user alter when the conversation is associated with the servlet request. If this filter is not mapped in any
* web.xml in the application, the conversation associated with a Servlet request is determined at the beginning of the
* request before calling any service() method of any servlet in the web application, calling the doFilter()
* method of any servlet filter in the web application and before the container calls any ServletRequestListener or
* AsyncListener in the web application.
*
*
*
*
* Any conversation is in one of two states: transient or long-running.
*
*
*
* - By default, a conversation is transient
* - A transient conversation may be marked long-running by calling {@link javax.enterprise.context.Conversation#begin()}
* - A long-running conversation may be marked transient by calling {@link javax.enterprise.context.Conversation#end()}
*
*
*
* All long-running conversations have a string-valued unique identifier, which may be set by the application when the
* conversation is marked long-running, or generated by the container.
*
*
*
* If the conversation associated with the current Servlet request is in the transient state at the end of a Servlet
* request, it is destroyed, and the conversation context is also destroyed.
*
*
*
* If the conversation associated with the current Servlet request is in the long-running state at the end of a Servlet
* request, it is not destroyed. The long-running conversation associated with a request may be propagated to any Servlet
* request via use of a request parameter named cid containing the unique identifier of the conversation. In this
* case, the application must manage this request parameter.
*
*
*
* If the current Servlet request is a JSF request, and the conversation is in long-running state, it is propagated
* according to the following rules:
*
*
*
* - The long-running conversation context associated with a request that renders a JSF view is automatically propagated to
* any faces request (JSF form submission) that originates from that rendered page.
* - The long-running conversation context associated with a request that results in a JSF redirect (a redirect resulting from
* a navigation rule or JSF NavigationHandler) is automatically propagated to the resulting non-faces request, and to any other
* subsequent request to the same URL. This is accomplished via use of a request parameter named cid containing the
* unique identifier of the conversation.
*
*
*
* When no conversation is propagated to a Servlet request, or if a request parameter named conversationPropagation has
* the value none the request is associated with a new transient conversation.
* All long-running conversations are scoped to a particular HTTP servlet session and may not cross session boundaries.
* In the following cases, a propagated long-running conversation cannot be restored and re-associated with the request:
*
*
*
* - When the HTTP servlet session is invalidated, all long-running conversation contexts created during the current session
* are destroyed, after the servlet service() method completes.
* - The container is permitted to arbitrarily destroy any long-running conversation that is associated with no current
* Servlet request, in order to conserve resources.
*
*
* @see javax.enterprise.context.Conversation
* @see javax.enterprise.context.NonexistentConversationException
* @see javax.enterprise.context.BusyConversationException
*
* @author Gavin King
* @author Pete Muir
* @author Antoine Sabot-Durand
*/
@Target({ TYPE, METHOD, FIELD })
@Retention(RUNTIME)
@Documented
@NormalScope(passivating = true)
@Inherited
public @interface ConversationScoped {
/**
* Supports inline instantiation of the {@link ConversationScoped} annotation.
*
* @author Martin Kouba
* @since 2.0
*/
public final static class Literal extends AnnotationLiteral implements ConversationScoped {
public static final Literal INSTANCE = new Literal();
private static final long serialVersionUID = 1L;
}
}