01: /*
02: * Copyright (c) 2002 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.api.internal;
26:
27: import seda.sandStorm.api.*;
28:
29: /**
30: * This interface represents a response time controller, invoked by the
31: * stage's thread manager to manipulate admission control policies to
32: * meet a response time target.
33: *
34: * @author Matt Welsh
35: */
36:
37: public interface ResponseTimeControllerIF {
38:
39: /** Set the response time target in milliseconds. */
40: public void setTarget(double RTtarget);
41:
42: /** Return the response time target. */
43: public double getTarget();
44:
45: /**
46: * Invoked by the stage's thread manager to adjust admission control
47: * parameters.
48: */
49: public void adjustThreshold(QueueElementIF fetched[],
50: long serviceTime);
51:
52: /** Enable the response time controller. */
53: public void enable();
54:
55: /** Disable the response time controller. */
56: public void disable();
57:
58: }
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