Source Code Cross Referenced for ResponseTimeController.java in  » Web-Server » Rimfaxe-Web-Server » seda » sandStorm » internal » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » seda.sandStorm.internal 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* 
02:         * Copyright (c) 2001 by Matt Welsh and The Regents of the University of 
03:         * California. All rights reserved.
04:         *
05:         * Permission to use, copy, modify, and distribute this software and its
06:         * documentation for any purpose, without fee, and without written agreement is
07:         * hereby granted, provided that the above copyright notice and the following
08:         * two paragraphs appear in all copies of this software.
09:         * 
10:         * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
11:         * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
12:         * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
13:         * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
14:         * 
15:         * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
16:         * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17:         * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
18:         * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
19:         * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
20:         *
21:         * Author: Matt Welsh <mdw@cs.berkeley.edu>
22:         * 
23:         */
24:
25:        package seda.sandStorm.internal;
26:
27:        import seda.sandStorm.api.*;
28:        import seda.sandStorm.api.internal.*;
29:        import seda.sandStorm.core.*;
30:        import seda.sandStorm.main.*;
31:        import java.util.*;
32:
33:        /**
34:         * The ResponseTimeController attempts to keep the response time of
35:         * a given stage below a given target by adjusting admission control
36:         * parameters for a stage.
37:         * 
38:         * @author   Matt Welsh
39:         */
40:        public abstract class ResponseTimeController implements 
41:                ResponseTimeControllerIF {
42:
43:            protected final static int INIT_THRESHOLD = 1;
44:            protected final static int MIN_THRESHOLD = 1;
45:            protected final static int MAX_THRESHOLD = 1024;
46:
47:            protected StageWrapperIF stage;
48:            protected EnqueuePredicateIF pred;
49:            protected double targetRT;
50:
51:            protected ResponseTimeController(ManagerIF mgr, StageWrapperIF stage)
52:                    throws IllegalArgumentException {
53:                this .stage = stage;
54:
55:                SandstormConfig config = mgr.getConfig();
56:                this .targetRT = config.getDouble("stages."
57:                        + stage.getStage().getName()
58:                        + ".rtController.targetResponseTime");
59:                if (this .targetRT == -1) {
60:                    this .targetRT = config
61:                            .getDouble("global.rtController.targetResponseTime");
62:                    if (this .targetRT == -1) {
63:                        throw new IllegalArgumentException(
64:                                "ResponseTimeController: Must specify targetResponseTime");
65:                    }
66:                }
67:            }
68:
69:            public void setTarget(double target) {
70:                this .targetRT = target;
71:            }
72:
73:            public double getTarget() {
74:                return targetRT;
75:            }
76:
77:            public abstract void adjustThreshold(QueueElementIF fetched[],
78:                    long serviceTime);
79:
80:            public abstract void enable();
81:
82:            public abstract void disable();
83:
84:        }
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