Source Code Cross Referenced for AccessLogWriter.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » server » log » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.server.log 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.server.log;
031:
032:        import com.caucho.log.AbstractRolloverLog;
033:        import com.caucho.util.Alarm;
034:        import com.caucho.util.FreeList;
035:        import com.caucho.util.L10N;
036:        import com.caucho.util.ThreadPool;
037:
038:        import java.io.IOException;
039:        import java.util.ArrayList;
040:        import java.util.logging.Level;
041:        import java.util.logging.Logger;
042:
043:        /**
044:         * Represents an log of every top-level request to the server.
045:         */
046:        public class AccessLogWriter extends AbstractRolloverLog implements 
047:                Runnable {
048:            protected static final L10N L = new L10N(AccessLogWriter.class);
049:            protected static final Logger log = Logger
050:                    .getLogger(AccessLogWriter.class.getName());
051:
052:            private static final int BUFFER_SIZE = 65536;
053:            private static final int BUFFER_GAP = 8 * 1024;
054:
055:            private static final FreeList<AccessLogBuffer> _freeBuffers = new FreeList<AccessLogBuffer>(
056:                    4);
057:
058:            private final AccessLog _log;
059:
060:            private final Object _bufferLock = new Object();
061:            private AccessLogBuffer _logBuffer;
062:            private byte[] _buffer;
063:            private int _length;
064:
065:            private boolean _hasThread;
066:            private boolean _isFlushing;
067:
068:            // the write queue
069:            private int _maxQueueLength = 32;
070:            private final ArrayList<AccessLogBuffer> _writeQueue = new ArrayList<AccessLogBuffer>();
071:
072:            AccessLogWriter(AccessLog log) {
073:                _log = log;
074:
075:                _logBuffer = getLogBuffer();
076:                _buffer = _logBuffer.getBuffer();
077:                _length = 0;
078:            }
079:
080:            private AccessLogBuffer getLogBuffer() {
081:                AccessLogBuffer buffer = _freeBuffers.allocate();
082:
083:                if (buffer == null)
084:                    buffer = new AccessLogBuffer();
085:
086:                return buffer;
087:            }
088:
089:            Object getBufferLock() {
090:                return _bufferLock;
091:            }
092:
093:            /**
094:             * Returns the current buffer for shared-buffer.  _bufferLock
095:             * must be synchronized.
096:             */
097:            byte[] getBuffer(int requiredLength) {
098:                if (_buffer.length - _length < requiredLength || isRollover()) {
099:                    flush();
100:                }
101:
102:                return _buffer;
103:            }
104:
105:            /**
106:             * Returns the current buffer length for shared-buffer.  _bufferLock
107:             * must be synchronized.
108:             */
109:            int getLength() {
110:                return _length;
111:            }
112:
113:            /**
114:             * Returns the current buffer length for shared-buffer.  _bufferLock
115:             * must be synchronized.
116:             */
117:            void setLength(int length) {
118:                _length = length;
119:            }
120:
121:            void writeBuffer(byte[] buffer, int offset, int length) {
122:                synchronized (_bufferLock) {
123:                    if (_buffer.length - _length < length || isRollover()) {
124:                        flush();
125:                    }
126:
127:                    if (_buffer.length < length)
128:                        length = _buffer.length;
129:
130:                    System.arraycopy(buffer, offset, _buffer, _length, length);
131:                    _length += length;
132:                }
133:            }
134:
135:            void writeThrough(byte[] buffer, int offset, int length) {
136:                try {
137:                    write(buffer, offset, length);
138:                    flush();
139:                } catch (IOException e) {
140:                    log.log(Level.WARNING, e.toString(), e);
141:                }
142:            }
143:
144:            private AccessLogBuffer write(AccessLogBuffer logBuffer) {
145:                while (true) {
146:                    synchronized (_writeQueue) {
147:                        if (_writeQueue.size() < _maxQueueLength) {
148:                            _writeQueue.add(logBuffer);
149:
150:                            if (!_hasThread) {
151:                                _hasThread = true;
152:                                ThreadPool.getThreadPool().startPriority(this );
153:                            }
154:
155:                            break;
156:                        } else if (!_isFlushing) {
157:                            try {
158:                                _isFlushing = true;
159:                                // If the queue is full, call the flush code directly
160:                                // since the thread pool may be out of threads for
161:                                // a schedule
162:                                log
163:                                        .fine("AccessLogWriter flushing log directly.");
164:
165:                                run();
166:                            } catch (Throwable e) {
167:                                log.log(Level.WARNING, e.toString(), e);
168:                            } finally {
169:                                _isFlushing = false;
170:                            }
171:                        }
172:                    }
173:                }
174:
175:                AccessLogBuffer buffer = _freeBuffers.allocate();
176:
177:                if (buffer == null)
178:                    buffer = new AccessLogBuffer();
179:
180:                return buffer;
181:            }
182:
183:            // must be synchronized by _bufferLock.
184:            protected void flush() {
185:                synchronized (_bufferLock) {
186:                    if (_length > 0) {
187:                        _logBuffer.setLength(_length);
188:                        _logBuffer = write(_logBuffer);
189:                        _buffer = _logBuffer.getBuffer();
190:                        _length = 0;
191:                    }
192:                }
193:
194:                try {
195:                    super .flush();
196:                } catch (IOException e) {
197:                    log.log(Level.WARNING, e.toString(), e);
198:                }
199:            }
200:
201:            protected void waitForFlush(long timeout) {
202:                long expire;
203:
204:                if (!Alarm.isTest())
205:                    expire = Alarm.getCurrentTime() + timeout;
206:                else
207:                    expire = System.currentTimeMillis() + timeout;
208:
209:                synchronized (_writeQueue) {
210:                    while (true) {
211:                        if (_writeQueue.size() == 0)
212:                            return;
213:
214:                        long delta;
215:                        if (!Alarm.isTest())
216:                            delta = expire - Alarm.getCurrentTime();
217:                        else
218:                            delta = expire - System.currentTimeMillis();
219:
220:                        if (delta < 0)
221:                            return;
222:
223:                        try {
224:                            _writeQueue.wait(delta);
225:                        } catch (Exception e) {
226:                        }
227:                    }
228:                }
229:            }
230:
231:            /**
232:             * Writes the buffer data to the output stream.
233:             */
234:            private void writeBuffer(AccessLogBuffer buffer) throws IOException {
235:                long now = Alarm.getCurrentTime();
236:
237:                write(buffer.getBuffer(), 0, buffer.getLength());
238:                super .flush();
239:
240:                _freeBuffers.free(buffer);
241:
242:                rolloverLog(now);
243:            }
244:
245:            /**
246:             * Closes the log, flushing the results.
247:             */
248:            public void destroy() throws IOException {
249:            }
250:
251:            public void run() {
252:                while (true) {
253:                    try {
254:                        AccessLogBuffer buffer = null;
255:
256:                        synchronized (_writeQueue) {
257:                            if (_writeQueue.size() > 0) {
258:                                buffer = _writeQueue.remove(0);
259:                                _writeQueue.notifyAll();
260:                            } else {
261:                                _hasThread = false;
262:                                return;
263:                            }
264:                        }
265:
266:                        if (buffer != null) {
267:                            writeBuffer(buffer);
268:                        }
269:                    } catch (Throwable e) {
270:                        log.log(Level.WARNING, e.toString(), e);
271:                    }
272:                }
273:            }
274:        }
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