01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * The contents of this file are subject to the terms of either the GNU
07: * General Public License Version 2 only ("GPL") or the Common
08: * Development and Distribution License("CDDL") (collectively, the
09: * "License"). You may not use this file except in compliance with the
10: * License. You can obtain a copy of the License at
11: * http://www.netbeans.org/cddl-gplv2.html
12: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
13: * specific language governing permissions and limitations under the
14: * License. When distributing the software, include this License Header
15: * Notice in each file and include the License file at
16: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
17: * particular file as subject to the "Classpath" exception as provided
18: * by Sun in the GPL Version 2 section of the License file that
19: * accompanied this code. If applicable, add the following below the
20: * License Header, with the fields enclosed by brackets [] replaced by
21: * your own identifying information:
22: * "Portions Copyrighted [year] [name of copyright owner]"
23: *
24: * Contributor(s):
25: *
26: * The Original Software is NetBeans. The Initial Developer of the Original
27: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
28: * Microsystems, Inc. All Rights Reserved.
29: *
30: * If you wish your version of this file to be governed by only the CDDL
31: * or only the GPL Version 2, indicate your decision by adding
32: * "[Contributor] elects to include this software in this distribution
33: * under the [CDDL or GPL Version 2] license." If you do not indicate a
34: * single choice of license, a recipient has the option to distribute
35: * your version of this file under either the CDDL, the GPL Version 2 or
36: * to extend the choice of license to its licensees as provided above.
37: * However, if you add GPL Version 2 code and therefore, elected the GPL
38: * Version 2 license, then the option applies only if the new code is
39: * made subject to such option by the copyright holder.
40: */
41:
42: package org.netbeans.modules.cnd.repository.sfs;
43:
44: import org.netbeans.modules.cnd.repository.testbench.Stats;
45:
46: /**
47: * A class for gathering recent write statistics
48: * @author Vladimir Kvashin
49: */
50: public class WriteStatistics {
51:
52: private static final WriteStatistics instance = new WriteStatistics();
53:
54: /** Private constructor to prevent external creation */
55: private WriteStatistics() {
56: }
57:
58: public static final WriteStatistics instance() {
59: return instance;
60: }
61:
62: private long writeStatIntervalStart = 0;
63: private int writeStatInterval = 1000;
64: private int writeCount = 0;
65: //private int[] writesPerInterval = new int[10];
66: private long totalWriteCount = 0;
67:
68: public void update(int increment) {
69: totalWriteCount += increment;
70: long currTime = System.currentTimeMillis();
71: if (this .writeStatIntervalStart == 0) { // called first time
72: writeCount = increment;
73: writeStatIntervalStart = System.currentTimeMillis();
74: } else if (currTime - writeStatIntervalStart < writeStatInterval) {
75: writeCount += increment;
76: } else {
77: int currentWPS = (int) (1000L * writeCount / (currTime - writeStatIntervalStart));
78: writeStatIntervalStart = currTime;
79: // for( int i = 1; i < writesPerInterval.length; i++ ) {
80: // writesPerInterval[i-1] = writesPerInterval[i];
81: // }
82: // writesPerInterval[writesPerInterval.length-1] = currentWPS;
83: if (Stats.writeStatistics) {
84: // System.err.printf("Write statistics\n");
85: // for (int i = 0; i < writesPerInterval.length; i++) {
86: // System.err.printf("\t%s %d WPS\n", baseFile.getName(), writesPerInterval[i]);
87: // }
88: System.err
89: .printf(
90: "\tcurrent writes: %4d current WPS: %4d total writes: %8d \n",
91: writeCount, currentWPS, totalWriteCount);
92: }
93: writeCount = increment;
94: }
95: }
96: }
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