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comparison src/com/go/trove/log/LogEventParsingWriter.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
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.log;
54
55 import java.io.*;
56 import java.util.*;
57
58 /******************************************************************************
59 * LogEventParsingWriter parses the data written to it and converts it
60 * to LogEvent objects. Add a LogListener to intercept LogEvents. Events are
61 * parsed based on newline characters (LF, CRLF or CR) or a switch to a
62 * different thread.
63 *
64 * @author Brian S O'Neill
65 * @version
66 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 9/07/00 <!-- $-->
67 */
68 public class LogEventParsingWriter extends Writer {
69 private Vector mListeners;
70 private Log mSource;
71 private int mType;
72
73 private CharArrayWriter mMessageBuffer;
74 private Thread mMessageThread;
75
76 private Date mTimestamp;
77
78 // Set to true upon reading a CR so that if the next character is a LF,
79 // it is consumed. This is how CRLF patterns are discovered.
80 private boolean mTrackLF;
81
82 /**
83 * @param source Source object to create events with.
84 * @param type Type of events to create.
85 */
86 public LogEventParsingWriter(Log source, int type) {
87 mListeners = new Vector(2);
88 mSource = source;
89 mType = type;
90
91 mMessageBuffer = new CharArrayWriter();
92 }
93
94 /**
95 * @param source Source object to create events with.
96 * @param type Type of events to create.
97 * @param lock Synchronization lock.
98 */
99 public LogEventParsingWriter(Log source, int type, Object lock) {
100 super(lock);
101 mListeners = new Vector(2);
102 mSource = source;
103 mType = type;
104
105 mMessageBuffer = new CharArrayWriter();
106 }
107
108 public void addLogListener(LogListener listener) {
109 mListeners.addElement(listener);
110 }
111
112 public void removeLogListener(LogListener listener) {
113 mListeners.removeElement(listener);
114 }
115
116 private void flushLogEvent() {
117 synchronized (lock) {
118 if (mMessageThread == null) {
119 return;
120 }
121
122 String message = mMessageBuffer.toString();
123
124 if (mMessageBuffer.size() > 10000) {
125 mMessageBuffer = new CharArrayWriter();
126 }
127 else {
128 mMessageBuffer.reset();
129 }
130
131 LogEvent e;
132 if (mTimestamp == null) {
133 e = new LogEvent(mSource, mType, message, mMessageThread);
134 }
135 else {
136 e = new LogEvent(mSource, mType, message, mMessageThread,
137 mTimestamp);
138 mTimestamp = null;
139 }
140
141 synchronized (mListeners) {
142 Enumeration group = mListeners.elements();
143 while (group.hasMoreElements()) {
144 ((LogListener)group.nextElement()).logMessage(e);
145 }
146 }
147 }
148 }
149
150 public void write(char[] array, int off, int len) throws IOException {
151 synchronized (lock) {
152 if (!isEnabled()) {
153 if (mMessageBuffer.size() > 0) {
154 flushLogEvent();
155 }
156 return;
157 }
158
159 Thread current = Thread.currentThread();
160 if (current != mMessageThread) {
161 if (mMessageBuffer.size() > 0) {
162 flushLogEvent();
163 }
164 mMessageThread = current;
165 }
166
167 int writtenLength = 0;
168
169 int i = 0;
170 for (i=0; i<len; i++) {
171 char c = array[i + off];
172 if (c == '\r') {
173 mTrackLF = true;
174 writeToBuffer(array, writtenLength + off,
175 i - writtenLength);
176 // Add one more than i to skip the CR.
177 writtenLength = i + 1;
178 flushLogEvent();
179 }
180 else if (c == '\n') {
181 if (mTrackLF) {
182 // Consume the LF of CRLF.
183 mTrackLF = false;
184 writtenLength++;
185 }
186 else {
187 writeToBuffer(array, writtenLength + off,
188 i - writtenLength);
189 // Add one more than i to skip the LF.
190 writtenLength = i + 1;
191 flushLogEvent();
192 }
193 }
194 else {
195 mTrackLF = false;
196 }
197 }
198
199 writeToBuffer(array, writtenLength + off, i - writtenLength);
200 }
201 }
202
203 public void flush() throws IOException {
204 }
205
206 public void close() throws IOException {
207 synchronized (lock) {
208 mMessageBuffer.close();
209 }
210 }
211
212 /**
213 * Returning false discards written data, and events are not generated.
214 * Default implementation always returns true.
215 */
216 public boolean isEnabled() {
217 return true;
218 }
219
220 private void writeToBuffer(char[] array, int off, int len) {
221 if (mMessageBuffer.size() == 0) {
222 mTimestamp = new Date();
223 }
224 mMessageBuffer.write(array, off, len);
225 }
226 }