01: /*
02: * Copyright 2004-2007 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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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