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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one
    3    * or more contributor license agreements.  See the NOTICE file
    4    * distributed with this work for additional information
    5    * regarding copyright ownership.  The ASF licenses this file
    6    * to you under the Apache License, Version 2.0 (the
    7    * "License"); you may not use this file except in compliance
    8    * with the License.  You may obtain a copy of the License at
    9    *
    10   *   http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   * Unless required by applicable law or agreed to in writing,
    13   * software distributed under the License is distributed on an
    14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   * KIND, either express or implied.  See the License for the
    16   * specific language governing permissions and limitations
    17   * under the License.
    18   */
    19  package org.apache.myfaces.orchestra.conversation.spring;
    20
    21  import org.apache.commons.logging.Log;
    22  import org.apache.commons.logging.LogFactory;
    23  import org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource;
    24  import org.springframework.beans.factory.BeanFactory;
    25  import org.springframework.beans.factory.ObjectFactory;
    26
    27  /**
    28   * Used with a "scoping proxy" object as generated by _SpringUtils.newProxy.
    29   * <p>
    30   * When user code invokes any method on the proxy, it invokes getTarget on its
    31   * source object to get the "real" object, then invokes the same method on the
    32   * returned object.
    33   * <p>
    34   * Here the getTarget method is implemented by using an AbstractSpringOrchestraScope
    35   * object to look up the ConversationContext for the user, then a particular
    36   * Conversation instance (by name), then a bean within that Conversation.
    37   * <p>
    38   * TODO: deal with serialization issues here. When an http session containing
    39   * conversation-scoped beans is serialized, instances of this type will of course
    40   * be serialized too. But the "scope" and "objectFactory" members here are not
    41   * serializable. Somehow instances of this class need enough information to
    42   * relocate the appropriate objects on deserialization.
    43   *
    44   * @since 1.1
    45   */
    46  public class ScopedBeanTargetSource extends AbstractBeanFactoryBasedTargetSource
    47  {
    48      private AbstractSpringOrchestraScope scope;
    49      private String conversationName;
    50      private String targetBeanName;
    51      private ObjectFactory objectFactory;
    52
    53      public ScopedBeanTargetSource(
    54              AbstractSpringOrchestraScope scope,
    55              String conversationName,
    56              String targetBeanName,
    57              ObjectFactory objectFactory,
    58              BeanFactory beanFactory)
    59      {
    60          this.scope = scope;
    61          this.conversationName = conversationName;
    62          this.targetBeanName = targetBeanName;
    63          this.objectFactory = objectFactory;
    64
    65          super.setTargetBeanName(targetBeanName);
    66          super.setBeanFactory(beanFactory);
    67      }
    68
    69      public Object getTarget() throws Exception
    70      {
    71          final Log log = LogFactory.getLog(ScopedBeanTargetSource.class);
    72          if (log.isDebugEnabled())
    73          {
    74              log.debug("getRealBean for " + targetBeanName);
    75          }
    76          return scope.getRealBean(conversationName, targetBeanName, objectFactory);
    77      }
    78  }