01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: *
17: */
18:
19: package org.apache.jmeter.control;
20:
21: import java.io.Serializable;
22:
23: import org.apache.jmeter.engine.event.LoopIterationEvent;
24: import org.apache.jmeter.engine.event.LoopIterationListener;
25: import org.apache.jmeter.samplers.Sampler;
26:
27: /**
28: * @author Michael Stover Created March 13, 2001
29: * @version $Revision: 493775 $ Last updated: $Date: 2007-01-07 17:09:09 +0000 (Sun, 07 Jan 2007) $
30: */
31: public class OnceOnlyController extends GenericController implements
32: Serializable, LoopIterationListener {
33:
34: /**
35: * Constructor for the OnceOnlyController object.
36: */
37: public OnceOnlyController() {
38: }
39:
40: /**
41: * @see LoopIterationListener#iterationStart(LoopIterationEvent)
42: */
43: public void iterationStart(LoopIterationEvent event) {
44: if (event.getIteration() == 1) {
45: reInitialize();
46: }
47: }
48:
49: protected Sampler nextIsNull() throws NextIsNullException {
50: return null;
51: }
52: }
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