001 /*
002 * ============================================================================
003 * GNU Lesser General Public License
004 * ============================================================================
005 *
006 * Beanlet - JSE Application Container.
007 * Copyright (C) 2006 Leon van Zantvoort
008 *
009 * This library is free software; you can redistribute it and/or
010 * modify it under the terms of the GNU Lesser General Public
011 * License as published by the Free Software Foundation; either
012 * version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful,
015 * but WITHOUT ANY WARRANTY; without even the implied warranty of
016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
017 * Lesser General Public License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
022 *
023 * Leon van Zantvoort
024 * 243 Acalanes Drive #11
025 * Sunnyvale, CA 94086
026 * USA
027 *
028 * zantvoort@users.sourceforge.net
029 * http://beanlet.org
030 */
031 package org.beanlet.web;
032
033 import java.lang.annotation.ElementType;
034 import java.lang.annotation.Retention;
035 import java.lang.annotation.RetentionPolicy;
036 import java.lang.annotation.Target;
037 import org.beanlet.ScopeAnnotation;
038
039 /**
040 * <p>Session beanlets do not provide direct access to the
041 * underlying objects. Instead, clients obtain a stub that delegates
042 * invocations to the underlying instance. In case of request beanlets,
043 * the stub creates a new instance per HTTP session. This instance is always
044 * assigned while performing a request for that particular HTTP session.
045 * Session beanlet instances only exist while the session, for which they were
046 * created, is active. These beanlet instances are destroyed when their HTTP
047 * session is invalidated or expired.<br>
048 * Session beanlets are non {@code reentrant} by default, which means that only
049 * one thread can invoke a method of the beanlet instance at the same time.
050 * This feature is provided by the stub, which controls all access to the
051 * underlying instance. Session beanlets can also be configured to be reentrant.</p>
052 *
053 * {@beanlet.annotation}
054 *
055 * @see ScopeAnnotation
056 * @author Leon van Zantvoort
057 */
058 @ScopeAnnotation
059 @Retention(RetentionPolicy.RUNTIME)
060 @Target(ElementType.TYPE)
061 public @interface Session {
062
063 /**
064 * Specifies whether the beanlet instances should be reentrant or not.
065 * Instances of reentrant beanlets can be invoked by multiple threads at
066 * the same time.
067 */
068 boolean reentrant() default false;
069 }