Mercurial > hg > blitz_condensed
comparison src/com/go/trove/util/tq/TransactionQueueThreadTuner.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* ==================================================================== | |
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group | |
3 * ==================================================================== | |
4 * The Tea Software License, Version 1.1 | |
5 * | |
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. | |
7 * | |
8 * Redistribution and use in source and binary forms, with or without | |
9 * modification, are permitted provided that the following conditions | |
10 * are met: | |
11 * | |
12 * 1. Redistributions of source code must retain the above copyright | |
13 * notice, this list of conditions and the following disclaimer. | |
14 * | |
15 * 2. Redistributions in binary form must reproduce the above copyright | |
16 * notice, this list of conditions and the following disclaimer in | |
17 * the documentation and/or other materials provided with the | |
18 * distribution. | |
19 * | |
20 * 3. The end-user documentation included with the redistribution, | |
21 * if any, must include the following acknowledgment: | |
22 * "This product includes software developed by the | |
23 * Walt Disney Internet Group (http://opensource.go.com/)." | |
24 * Alternately, this acknowledgment may appear in the software itself, | |
25 * if and wherever such third-party acknowledgments normally appear. | |
26 * | |
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must | |
28 * not be used to endorse or promote products derived from this | |
29 * software without prior written permission. For written | |
30 * permission, please contact opensource@dig.com. | |
31 * | |
32 * 5. Products derived from this software may not be called "Tea", | |
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", | |
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior | |
35 * written permission of the Walt Disney Internet Group. | |
36 * | |
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED | |
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS | |
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
48 * ==================================================================== | |
49 * | |
50 * For more information about Tea, please see http://opensource.go.com/. | |
51 */ | |
52 | |
53 package com.go.trove.util.tq; | |
54 | |
55 /****************************************************************************** | |
56 * Automatically tunes a TransactionQueue by dynamically adjusting the maximum | |
57 * allowed number of worker threads. A TransactionQueueThreadTuner instance | |
58 * should only be added to one TransactionQueue. | |
59 * <p> | |
60 * NOTE: The current implementation of TransactionQueueThreadTuner is | |
61 * experimental and should not be used in production systems. | |
62 * | |
63 * @author Brian S O'Neill | |
64 * @version | |
65 * <!--$$Revision:--> 5 <!-- $-->, <!--$$JustDate:--> 9/25/00 <!-- $--> | |
66 */ | |
67 public class TransactionQueueThreadTuner extends TransactionQueueAdapter { | |
68 private long mLastQueueTime; | |
69 private long mLastServiceTime; | |
70 | |
71 private long mTotalQueueDelta; | |
72 private long mTotalServiceDelta; | |
73 | |
74 private boolean mBaton; | |
75 | |
76 public synchronized void transactionDequeued(TransactionQueueEvent e) { | |
77 long queueTime = e.getStageDuration(); | |
78 mTotalQueueDelta += queueTime - mLastQueueTime; | |
79 mLastQueueTime = queueTime; | |
80 | |
81 if (!mBaton) { | |
82 mBaton = true; | |
83 tune(e); | |
84 } | |
85 } | |
86 | |
87 public synchronized void transactionServiced(TransactionQueueEvent e) { | |
88 long serviceTime = e.getStageDuration(); | |
89 mTotalServiceDelta += serviceTime - mLastServiceTime; | |
90 mLastServiceTime = serviceTime; | |
91 | |
92 if (mBaton) { | |
93 mBaton = false; | |
94 tune(e); | |
95 } | |
96 } | |
97 | |
98 private void tune(TransactionQueueEvent e) { | |
99 if (mTotalQueueDelta > mTotalServiceDelta) { | |
100 TransactionQueue queue = e.getTransactionQueue(); | |
101 int maxThreads = queue.getMaximumThreads(); | |
102 if (maxThreads <= queue.getThreadCount() * 2) { | |
103 // Increase the maximum amount of threads. | |
104 queue.setMaximumThreads(maxThreads + 1); | |
105 } | |
106 } | |
107 else if (mTotalServiceDelta > mTotalQueueDelta) { | |
108 TransactionQueue queue = e.getTransactionQueue(); | |
109 int maxThreads = queue.getMaximumThreads(); | |
110 if (maxThreads > 1) { | |
111 // Decrease the maximum amount of threads. | |
112 queue.setMaximumThreads(maxThreads - 1); | |
113 } | |
114 } | |
115 } | |
116 } |