01: /**
02: * ===========================================
03: * JFreeReport : a free Java reporting library
04: * ===========================================
05: *
06: * Project Info: http://reporting.pentaho.org/
07: *
08: * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
09: *
10: * This library is free software; you can redistribute it and/or modify it under the terms
11: * of the GNU Lesser General Public License as published by the Free Software Foundation;
12: * either version 2.1 of the License, or (at your option) any later version.
13: *
14: * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
16: * See the GNU Lesser General Public License for more details.
17: *
18: * You should have received a copy of the GNU Lesser General Public License along with this
19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20: * Boston, MA 02111-1307, USA.
21: *
22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
23: * in the United States and other countries.]
24: *
25: * ------------
26: * YieldReportListener.java
27: * ------------
28: * (C) Copyright 2001-2007, by Object Refinery Ltd, Pentaho Corporation and Contributors.
29: */package org.jfree.report.layout.output;
30:
31: import org.jfree.report.event.ReportProgressEvent;
32: import org.jfree.report.event.ReportProgressListener;
33:
34: /**
35: * A report listener that calls Thread.yield() on each generated event. Although this slows down the report processing a
36: * bit, this also makes the application a lot more responsive as the report-thread does no longer block the CPU all the
37: * time.
38: *
39: * @author Thomas Morgner
40: */
41: public class YieldReportListener implements ReportProgressListener {
42: private int rate;
43:
44: private transient int lastCall;
45:
46: private transient int lastPage;
47:
48: public YieldReportListener() {
49: rate = 50;
50: }
51:
52: public YieldReportListener(final int rate) {
53: this .rate = rate;
54: }
55:
56: public int getRate() {
57: return rate;
58: }
59:
60: public void setRate(final int rate) {
61: this .rate = rate;
62: }
63:
64: public void reportProcessingStarted(final ReportProgressEvent event) {
65:
66: }
67:
68: public void reportProcessingFinished(final ReportProgressEvent event) {
69:
70: }
71:
72: public void reportProcessingUpdate(final ReportProgressEvent event) {
73: final int currentRow = event.getRow();
74: final int this Call = currentRow % rate;
75: final int page = event.getPage();
76:
77: if (page != lastPage) {
78: Thread.yield();
79: } else if (thisCall != lastCall) {
80: Thread.yield();
81: }
82: lastCall = thisCall;
83: lastPage = page;
84: }
85: }
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