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Java > Open Source Codes > org > springframework > webflow > execution > repository > FlowExecutionLock


1 /*
2  * Copyright 2002-2006 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.springframework.webflow.execution.repository;
17
18 /**
19  * A pessmistic lock to obtain exclusive rights to a flow execution. Used to
20  * prevent conflicts when multiple requests to manipulate a flow execution
21  * arrive from different threads concurrently.
22  *
23  * @author Keith Donald
24  */
25 public interface FlowExecutionLock {
26
27     /**
28      * Acquire the flow execution lock. This method will block until the lock
29      * becomes available for acquisition.
30      */
31     public void lock();
32
33     /**
34      * Release the flow execution lock.
35      */
36     public void unlock();
37 }
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