org.springframework.webflow.execution.repository.support.ConversationBackedFlowExecutionLock Maven / Gradle / Ivy
/*
* Copyright 2002-2006 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.webflow.execution.repository.support;
import org.springframework.webflow.conversation.Conversation;
import org.springframework.webflow.conversation.ConversationManager;
import org.springframework.webflow.execution.repository.FlowExecutionLock;
/**
* A flow execution lock that locks a conversation managed by a
* {@link ConversationManager}.
*
* This implementation ensures multiple threads cannot manipulate the same
* conversation at the same time. The locked conversation is the sole gateway to
* a flow execution, and a lock on it prevents access to any associated
* execution.
*
* @see ConversationManager
* @see Conversation
* @see Conversation#lock()
* @see Conversation#unlock()
*
* @author Keith Donald
*/
class ConversationBackedFlowExecutionLock implements FlowExecutionLock {
/**
* The conversation to lock.
*/
private Conversation conversation;
/**
* Creates a new conversation-backed flow execution lock.
* @param conversation the conversation to lock
*/
public ConversationBackedFlowExecutionLock(Conversation conversation) {
this.conversation = conversation;
}
public void lock() {
conversation.lock();
}
public void unlock() {
conversation.unlock();
}
}