Browse Source

SPR-6420, refactoring conversation scope for more simplicity

conversation
Micha Kiener 14 years ago
parent
commit
92ff07de15
  1. 3
      org.springframework.context/src/main/java/org/springframework/conversation/Conversation.java
  2. 159
      org.springframework.context/src/main/java/org/springframework/conversation/manager/ConversationManager.java
  3. 194
      org.springframework.context/src/main/java/org/springframework/conversation/scope/ConversationScope.java
  4. 208
      org.springframework.context/src/main/java/org/springframework/conversation/scope/DefaultConversationScope.java
  5. 2
      org.springframework.context/src/test/java/org/springframework/conversation/conversationTestContext.xml
  6. 8
      org.springframework.web/src/main/java/org/springframework/web/conversation/WebAwareConversationScope.java

3
org.springframework.context/src/main/java/org/springframework/conversation/Conversation.java

@ -20,11 +20,10 @@ import java.util.List; @@ -20,11 +20,10 @@ import java.util.List;
import java.util.Map;
import org.springframework.conversation.manager.ConversationManager;
import org.springframework.conversation.scope.ConversationScope;
/**
* The interface for a conversation, the instance behind the
* {@link ConversationScope}.<br/>
* {@link org.springframework.conversation.scope.ConversationScope}.<br/>
* Conversations are created through the {@link ConversationManager} which is
* the main API for conversation management unless the annotations are used. See
* {@link ConversationManager} for a more detailed description on how the

159
org.springframework.context/src/main/java/org/springframework/conversation/manager/ConversationManager.java

@ -26,105 +26,68 @@ import org.springframework.conversation.JoinMode; @@ -26,105 +26,68 @@ import org.springframework.conversation.JoinMode;
import org.springframework.conversation.annotation.BeginConversation;
import org.springframework.conversation.annotation.Conversational;
import org.springframework.conversation.annotation.EndConversation;
import org.springframework.conversation.scope.ConversationScope;
/**
* <p>
* The interface to be implemented by any conversation manager. It is used by
* the advice behind the conversational annotations like
* {@link BeginConversation}, {@link EndConversation} and {@link Conversational}
* but might be used for even fine grained access to the underlying conversation
* management, if a initializer callback is needed for instance or if
* conversation switching should be used. If used directly, the conversation
* manager can be injected into any bean to be used as it is a singleton and
* thread safe.<br/>
*
* Conversations are a good way to scope beans and attributes depending on
* business logic boundary rather than a technical boundary of a scope like
* session, request etc. Usually a conversation boundary is defined by the
* starting point of a use case and ended accordingly or in other words a
* conversation defines the boundary for a unit of work.<br/>
* <br/>
*
* Here is a short description on how to use the conversation management:<br/>
* <br/>
* <b>Starting a conversation</b><br/>
* A conversation can be started in two different ways, either by placing the
* {@link BeginConversation} annotation on a method defining the starting point
* of the conversation (use case) or by invoking
* {@link ConversationManager#beginConversation(boolean, JoinMode)} manually
* through the conversation manager. The {@link JoinMode} declares on how a new
* conversation is created (see its javadoc for more details on the different
* join modes).<br/>
* <br/>
*
* <b>Ending a conversation</b><br/>
* A current conversation is ended by either placing the {@link EndConversation}
* annotation on the ending method or by manually invoke the
* {@link ConversationManager#endCurrentConversation(ConversationEndingType)}
* method. A current conversation might also be ended, if a new conversation is
* started having {@link JoinMode#NEW} being declared where the current
* conversation is ended silently and a new one is created. This might be the
* obvious way to end a conversation, if the end of a use case is not always
* forced to be invoked by a user.<br/>
* <br/>
*
* <b>Temporary conversations</b><br/>
* A temporary conversation is automatically created, if the container is about
* to create a bean having conversation scope but there is no current
* conversation in progress, hence a new, temporary conversation is created. A
* temporary conversation might be turned into a long running one by joining it
* or manually invoke {@link Conversation#begin()}.<br/>
* <br/>
*
* <b>Initializing the conversation</b><br/>
* If there is any need to initialize beans or entities while starting a new
* conversation, the {@link ConversationInitializationCallback} might be used to
* be invoked if the new conversation was started in order to initialize it.
* This is done by providing such a callback to the
* {@link ConversationManager#beginConversation(JoinMode, ConversationType, ConversationInitializationCallback...)}
* method. The callback feature is not available through the annotation support
* and hence is only available through the conversation manager API. Here is an
* example on such an initializing feature; if a conversation is used in
* conjunction of a JPA entity manager or Hibernate session, there might be
* entity beans already loaded, cached or referenced within backing beans which
* have to be merged into the entity manager or session in order to be used
* within the conversation's work. So it would be possible to implement the
* callback, merging the necessary entities used within the conversation into
* the entity manager.<br/>
* <br/>
*
* <b>Listening to conversation events</b><br/>
* If there is a need to listening to events of a conversation, add yourself as
* a {@link ConversationListener} to a new {@link Conversation} as being
* returned by this {@link ConversationManager}. The same goal can be achieved
* by implementing the {@link ConversationListener} interface on a conversation
* scoped bean which will be registered automatically to receive events.<br/>
* <br/>
*
* <b>Nesting conversations</b><br/>
* Conversations might be nested either by inheriting the state of the parent (
* {@link JoinMode#NESTED}) or by isolating its state from the parent (
* {@link JoinMode#ISOLATED}). Ending a nested conversation automatically
* switches back to its parent making it the current conversation.<br/>
* <br/>
*
* <b>Where are conversations stored?</b><br/>
* Conversations are created by the {@link ConversationManager} and registered
* within the {@link ConversationScope}. The scope handler is injected into the
* manager by Spring (statically as both beans are singletons) and registered as
* a custom scope. As the scope handler is a singleton, it needs a store where
* conversations are stored within which is usually bound to the current session
* or window of a user and represented by the {@link ConversationStore}
* interface. The store is usually being injected into the scope handler using
* method injection as the store has a narrower scope than the scope handler. In
* a web environment, the store would typically live in session scope to
* separate the conversations from each of the sessions. There is always one
* current conversation either stored within the session or as a request
* parameter passed along every request to set the current conversation and is
* accessed by the manager using a {@link ConversationResolver}.
* </p>
*
* <p> The interface to be implemented by any conversation manager. It is used by the advice behind the conversational
* annotations like {@link BeginConversation}, {@link EndConversation} and {@link Conversational} but might be used for
* even fine grained access to the underlying conversation management, if a initializer callback is needed for instance
* or if conversation switching should be used. If used directly, the conversation manager can be injected into any bean
* to be used as it is a singleton and thread safe.<br/>
*
* Conversations are a good way to scope beans and attributes depending on business logic boundary rather than a
* technical boundary of a scope like session, request etc. Usually a conversation boundary is defined by the starting
* point of a use case and ended accordingly or in other words a conversation defines the boundary for a unit of
* work.<br/> <br/>
*
* Here is a short description on how to use the conversation management:<br/> <br/> <b>Starting a conversation</b><br/>
* A conversation can be started in two different ways, either by placing the {@link BeginConversation} annotation on a
* method defining the starting point of the conversation (use case) or by invoking {@link
* ConversationManager#beginConversation(boolean, JoinMode)} manually through the conversation manager. The {@link
* JoinMode} declares on how a new conversation is created (see its javadoc for more details on the different join
* modes).<br/> <br/>
*
* <b>Ending a conversation</b><br/> A current conversation is ended by either placing the {@link EndConversation}
* annotation on the ending method or by manually invoke the {@link ConversationManager#endCurrentConversation(ConversationEndingType)}
* method. A current conversation might also be ended, if a new conversation is started having {@link JoinMode#NEW}
* being declared where the current conversation is ended silently and a new one is created. This might be the obvious
* way to end a conversation, if the end of a use case is not always forced to be invoked by a user.<br/> <br/>
*
* <b>Temporary conversations</b><br/> A temporary conversation is automatically created, if the container is about to
* create a bean having conversation scope but there is no current conversation in progress, hence a new, temporary
* conversation is created. A temporary conversation might be turned into a long running one by joining it or manually
* invoke {@link Conversation#begin()}.<br/> <br/>
*
* <b>Initializing the conversation</b><br/> If there is any need to initialize beans or entities while starting a new
* conversation, the {@link ConversationInitializationCallback} might be used to be invoked if the new conversation was
* started in order to initialize it. This is done by providing such a callback to the {@link
* ConversationManager#beginConversation(JoinMode, ConversationType, ConversationInitializationCallback...)} method. The
* callback feature is not available through the annotation support and hence is only available through the conversation
* manager API. Here is an example on such an initializing feature; if a conversation is used in conjunction of a JPA
* entity manager or Hibernate session, there might be entity beans already loaded, cached or referenced within backing
* beans which have to be merged into the entity manager or session in order to be used within the conversation's work.
* So it would be possible to implement the callback, merging the necessary entities used within the conversation into
* the entity manager.<br/> <br/>
*
* <b>Listening to conversation events</b><br/> If there is a need to listening to events of a conversation, add
* yourself as a {@link ConversationListener} to a new {@link Conversation} as being returned by this {@link
* ConversationManager}. The same goal can be achieved by implementing the {@link ConversationListener} interface on a
* conversation scoped bean which will be registered automatically to receive events.<br/> <br/>
*
* <b>Nesting conversations</b><br/> Conversations might be nested either by inheriting the state of the parent ( {@link
* JoinMode#NESTED}) or by isolating its state from the parent ( {@link JoinMode#ISOLATED}). Ending a nested
* conversation automatically switches back to its parent making it the current conversation.<br/> <br/>
*
* <b>Where are conversations stored?</b><br/> Conversations are created by the {@link ConversationManager} and
* registered within the {@link org.springframework.conversation.scope.ConversationScope}. The scope handler is
* injected into the manager by Spring (statically as both beans are singletons) and registered as a custom scope. As
* the scope handler is a singleton, it needs a store where conversations are stored within which is usually bound to
* the current session or window of a user and represented by the {@link ConversationStore} interface. The store is
* usually being injected into the scope handler using method injection as the store has a narrower scope than the scope
* handler. In a web environment, the store would typically live in session scope to separate the conversations from
* each of the sessions. There is always one current conversation either stored within the session or as a request
* parameter passed along every request to set the current conversation and is accessed by the manager using a {@link
* ConversationResolver}. </p>
*
* @author Micha Kiener
* @since 3.1
*/
@ -132,7 +95,7 @@ public interface ConversationManager { @@ -132,7 +95,7 @@ public interface ConversationManager {
/**
* This method starts a new {@link Conversation} and registers it within the
* {@link ConversationScope} to be exposed as the current conversation.
* {@link org.springframework.conversation.scope.ConversationScope} to be exposed as the current conversation.
*
* @param temporary flag indicating whether this new conversation is
* temporary (if invoked from elsewhere as the scope, it should always be

194
org.springframework.context/src/main/java/org/springframework/conversation/scope/ConversationScope.java

@ -15,35 +15,213 @@ @@ -15,35 +15,213 @@
*/
package org.springframework.conversation.scope;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.config.Scope;
import org.springframework.conversation.Conversation;
import org.springframework.conversation.JoinMode;
import org.springframework.conversation.manager.ConversationManager;
import org.springframework.conversation.manager.ConversationResolver;
import org.springframework.conversation.manager.ConversationStore;
import org.springframework.util.Assert;
/**
* This interface is implemented by the conversation scope used to hold and
* expose conversation scoped beans. It will be registered as a custom scope
* within the application context.
* The default implementation of the {@link ConversationScope} exposed as
* <code>"conversation"</code> scope. It needs the {@link ConversationStore} and
* the {@link ConversationResolver} to resolve and request the current
* conversation where attributes are resolved with and registered in.
*
* @author Micha Kiener
* @since 3.1
*/
public interface ConversationScope extends Scope {
public class ConversationScope implements Scope {
/** The name of the scope being exposed within the application context. */
public static final String CONVERSATION_SCOPE_NAME = "conversation";
/**
* The name of the contextual object for the conversation manager (see
* {@link Scope#resolveContextualObject(String)}).
* {@link org.springframework.beans.factory.config.Scope#resolveContextualObject(String)}).
*/
public static final String REFERENCE_CONVERSATION_MANAGER = "conversationManager";
/**
* The name of the contextual object for the conversation store (see
* {@link Scope#resolveContextualObject(String)}).
* {@link org.springframework.beans.factory.config.Scope#resolveContextualObject(String)}).
*/
public static final String REFERENCE_CONVERSATION_STORE = "conversationStore";
/**
* The name of the contextual object for the conversation resolver (see
* {@link Scope#resolveContextualObject(String)}).
* {@link org.springframework.beans.factory.config.Scope#resolveContextualObject(String)}).
*/
public static final String REFERENCE_CONVERSATION_RESOLVER = "conversationResolver";
}
/** Holds the conversation manager reference, if statically injected. */
private ConversationManager conversationManager;
/** Holds the conversation store reference, if statically injected. */
private ConversationStore conversationStore;
/** Holds the conversation resolver reference, if statically injected. */
private ConversationResolver conversationResolver;
/**
* This method is invoked to resolve the current conversation used where
* attributes having conversation scope are being resolved with or stored
* in.
*
* @return the currently used conversation, or <code>null</code>, if no one
* currently available and <code>createIfNotExisting</code> is
* <code>false</code>
*/
protected Conversation getCurrentConversation(boolean createNewIfNotExisting) {
ConversationResolver resolver = getConversationResolver();
Assert.notNull(resolver, "No conversation resolver available within the conversation scope");
String conversationId = resolver.getCurrentConversationId();
Conversation conversation;
if (conversationId == null) {
if (createNewIfNotExisting) {
// start a new, temporary conversation using the default join
// mode
ConversationManager manager = getConversationManager();
conversation = manager.beginConversation(true, JoinMode.getDefaultJoinMode());
} else {
return null;
}
} else {
ConversationStore store = getConversationStore();
Assert.notNull(store, "No conversation store available within the conversation scope");
conversation = store.getConversation(conversationId);
Assert.notNull(conversation, "The conversation with id <" + conversationId
+ "> is not available within the store");
}
return conversation;
}
/**
* @see org.springframework.beans.factory.config.Scope#get(java.lang.String,
* org.springframework.beans.factory.ObjectFactory)
*/
public Object get(String name, ObjectFactory<?> objectFactory) {
Conversation conversation = getCurrentConversation(true);
Object attribute = conversation.getAttribute(name);
if (attribute == null) {
attribute = objectFactory.getObject();
conversation.setAttribute(name, attribute);
}
return attribute;
}
/**
* @see org.springframework.beans.factory.config.Scope#getConversationId()
*/
public String getConversationId() {
Conversation conversation = getCurrentConversation(false);
if (conversation != null) {
return conversation.getId();
}
return null;
}
/**
* @see org.springframework.beans.factory.config.Scope#registerDestructionCallback(java.lang.String,
* java.lang.Runnable)
*/
public void registerDestructionCallback(String name, Runnable callback) {
Conversation conversation = getCurrentConversation(false);
if (conversation != null) {
conversation.registerDestructionCallback(name, callback);
}
}
/**
* @see org.springframework.beans.factory.config.Scope#remove(java.lang.String)
*/
public Object remove(String name) {
Conversation conversation = getCurrentConversation(false);
if (conversation != null) {
return conversation.removeAttribute(name);
}
return null;
}
/**
* Supports the following objects:
* <ul>
* <li><code>"conversationManager"</code>, returns the {@link ConversationManager}</li>
* <li><code>"conversationStore"</code>, returns the {@link ConversationStore}</li>
* <li><code>"conversationResolver"</code>, returns the {@link ConversationResolver}</li>
* </ul>
*
* @see org.springframework.beans.factory.config.Scope#resolveContextualObject(java.lang.String)
*/
public Object resolveContextualObject(String key) {
if (REFERENCE_CONVERSATION_MANAGER.equals(key)) {
return getConversationManager();
} else if (REFERENCE_CONVERSATION_STORE.equals(key)) {
return getConversationStore();
} else if (REFERENCE_CONVERSATION_RESOLVER.equals(key)) {
return getConversationResolver();
}
return null;
}
/**
* @param conversationManager the conversation manager reference to be used
* by this scope
*/
public void setConversationManager(ConversationManager conversationManager) {
this.conversationManager = conversationManager;
}
/**
* @return the conversation manager reference
*/
public ConversationManager getConversationManager() {
return conversationManager;
}
/**
* @param conversationStore the reference of the conversation store to be
* injected and internally used to request registered conversation objects
*/
public void setConversationStore(ConversationStore conversationStore) {
this.conversationStore = conversationStore;
}
/**
* Returns the reference of the conversation store to be used. If the store
* is not within the same scope as the conversation scope, this method has
* to be injected.
*
* @return the reference of the conversation store
*/
public ConversationStore getConversationStore() {
return conversationStore;
}
/**
* @param conversationResolver the reference of the conversation resolver
* used to determine the currently used conversation id
*/
public void setConversationResolver(ConversationResolver conversationResolver) {
this.conversationResolver = conversationResolver;
}
/**
* Returns the reference of the conversation resolver to be used. If the
* resolver is not within the same scope as the conversation scope, this
* method has to be injected.
*
* @return the reference of the conversation resolver
*/
public ConversationResolver getConversationResolver() {
return conversationResolver;
}
}

208
org.springframework.context/src/main/java/org/springframework/conversation/scope/DefaultConversationScope.java

@ -1,208 +0,0 @@ @@ -1,208 +0,0 @@
/*
* Copyright 2002-2008 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.conversation.scope;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.conversation.Conversation;
import org.springframework.conversation.JoinMode;
import org.springframework.conversation.manager.ConversationManager;
import org.springframework.conversation.manager.ConversationResolver;
import org.springframework.conversation.manager.ConversationStore;
import org.springframework.util.Assert;
/**
* The default implementation of the {@link ConversationScope} exposed as
* <code>"conversation"</code> scope. It needs the {@link ConversationStore} and
* the {@link ConversationResolver} to resolve and request the current
* conversation where attributes are resolved with and registered in.
*
* @author Micha Kiener
* @since 3.1
*/
public class DefaultConversationScope implements ConversationScope{
/** Holds the conversation manager reference, if statically injected. */
private ConversationManager conversationManager;
/** Holds the conversation store reference, if statically injected. */
private ConversationStore conversationStore;
/** Holds the conversation resolver reference, if statically injected. */
private ConversationResolver conversationResolver;
/**
* This method is invoked to resolve the current conversation used where
* attributes having conversation scope are being resolved with or stored
* in.
*
* @return the currently used conversation, or <code>null</code>, if no one
* currently available and <code>createIfNotExisting</code> is
* <code>false</code>
*/
protected Conversation getCurrentConversation(boolean createNewIfNotExisting) {
ConversationResolver resolver = getConversationResolver();
Assert.notNull(resolver, "No conversation resolver available within the conversation scope");
String conversationId = resolver.getCurrentConversationId();
Conversation conversation;
if (conversationId == null) {
if (createNewIfNotExisting) {
// start a new, temporary conversation using the default join
// mode
ConversationManager manager = getConversationManager();
conversation = manager.beginConversation(true, JoinMode.getDefaultJoinMode());
} else {
return null;
}
} else {
ConversationStore store = getConversationStore();
Assert.notNull(store, "No conversation store available within the conversation scope");
conversation = store.getConversation(conversationId);
Assert.notNull(conversation, "The conversation with id <" + conversationId
+ "> is not available within the store");
}
return conversation;
}
/**
* @see org.springframework.beans.factory.config.Scope#get(java.lang.String,
* org.springframework.beans.factory.ObjectFactory)
*/
public Object get(String name, ObjectFactory<?> objectFactory) {
Conversation conversation = getCurrentConversation(true);
Object attribute = conversation.getAttribute(name);
if (attribute == null) {
attribute = objectFactory.getObject();
conversation.setAttribute(name, attribute);
}
return attribute;
}
/**
* @see org.springframework.beans.factory.config.Scope#getConversationId()
*/
public String getConversationId() {
Conversation conversation = getCurrentConversation(false);
if (conversation != null) {
return conversation.getId();
}
return null;
}
/**
* @see org.springframework.beans.factory.config.Scope#registerDestructionCallback(java.lang.String,
* java.lang.Runnable)
*/
public void registerDestructionCallback(String name, Runnable callback) {
Conversation conversation = getCurrentConversation(false);
if (conversation != null) {
conversation.registerDestructionCallback(name, callback);
}
}
/**
* @see org.springframework.beans.factory.config.Scope#remove(java.lang.String)
*/
public Object remove(String name) {
Conversation conversation = getCurrentConversation(false);
if (conversation != null) {
return conversation.removeAttribute(name);
}
return null;
}
/**
* Supports the following objects:
* <ul>
* <li><code>"conversationManager"</code>, returns the
* {@link ConversationManager}</li>
* <li><code>"conversationStore"</code>, returns the
* {@link ConversationStore}</li>
* <li><code>"conversationResolver"</code>, returns the
* {@link ConversationResolver}</li>
* </ul>
*
* @see org.springframework.beans.factory.config.Scope#resolveContextualObject(java.lang.String)
*/
public Object resolveContextualObject(String key) {
if (ConversationScope.REFERENCE_CONVERSATION_MANAGER.equals(key)) {
return getConversationManager();
} else if (ConversationScope.REFERENCE_CONVERSATION_STORE.equals(key)) {
return getConversationStore();
} else if (ConversationScope.REFERENCE_CONVERSATION_RESOLVER.equals(key)) {
return getConversationResolver();
}
return null;
}
/**
* @param conversationManager the conversation manager reference to be used
* by this scope
*/
public void setConversationManager(ConversationManager conversationManager) {
this.conversationManager = conversationManager;
}
/**
* @return the conversation manager reference
*/
public ConversationManager getConversationManager() {
return conversationManager;
}
/**
* @param conversationStore the reference of the conversation store to be
* injected and internally used to request registered conversation objects
*/
public void setConversationStore(ConversationStore conversationStore) {
this.conversationStore = conversationStore;
}
/**
* Returns the reference of the conversation store to be used. If the store
* is not within the same scope as the conversation scope, this method has
* to be injected.
*
* @return the reference of the conversation store
*/
public ConversationStore getConversationStore() {
return conversationStore;
}
/**
* @param conversationResolver the reference of the conversation resolver
* used to determine the currently used conversation id
*/
public void setConversationResolver(ConversationResolver conversationResolver) {
this.conversationResolver = conversationResolver;
}
/**
* Returns the reference of the conversation resolver to be used. If the
* resolver is not within the same scope as the conversation scope, this
* method has to be injected.
*
* @return the reference of the conversation resolver
*/
public ConversationResolver getConversationResolver() {
return conversationResolver;
}
}

2
org.springframework.context/src/test/java/org/springframework/conversation/conversationTestContext.xml

@ -31,7 +31,7 @@ @@ -31,7 +31,7 @@
<bean id="conversationResolver" class="org.springframework.conversation.manager.ThreadAttachedConversationResolver" />
<bean id="conversationScope" class="org.springframework.conversation.scope.DefaultConversationScope" lazy-init="false">
<bean id="conversationScope" class="org.springframework.conversation.scope.ConversationScope" lazy-init="false">
<property name="conversationManager" ref="conversationManager"/>
<property name="conversationStore" ref="conversationStore"/>
<property name="conversationResolver" ref="conversationResolver"/>

8
org.springframework.web/src/main/java/org/springframework/web/conversation/WebAwareConversationScope.java

@ -15,22 +15,22 @@ @@ -15,22 +15,22 @@
*/
package org.springframework.web.conversation;
import org.springframework.conversation.scope.DefaultConversationScope;
import org.springframework.conversation.scope.ConversationScope;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
/**
* The extension of the default conversation scope (
* {@link DefaultConversationScope}) by supporting contextual web objects
* {@link org.springframework.conversation.scope.ConversationScope}) by supporting contextual web objects
* returned by overwriting {@link #resolveContextualObject(String)}.
*
* @author Micha Kiener
* @since 3.1
*/
public class WebAwareConversationScope extends DefaultConversationScope {
public class WebAwareConversationScope extends ConversationScope {
/**
* @see org.springframework.conversation.scope.DefaultConversationScope#resolveContextualObject(java.lang.String)
* @see org.springframework.conversation.scope.ConversationScope#resolveContextualObject(java.lang.String)
*/
@Override
public Object resolveContextualObject(String key) {

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