Source Code Cross Referenced for IncludeResponseStream.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » server » connection » 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.connection 
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.connection;
031:
032:        import com.caucho.log.Log;
033:        import com.caucho.util.L10N;
034:
035:        import javax.servlet.ServletOutputStream;
036:        import javax.servlet.ServletResponse;
037:        import java.io.IOException;
038:        import java.io.OutputStream;
039:        import java.io.PrintWriter;
040:        import java.io.Writer;
041:        import java.util.logging.Level;
042:        import java.util.logging.Logger;
043:
044:        public class IncludeResponseStream extends ToByteResponseStream {
045:            static final Logger log = Log.open(IncludeResponseStream.class);
046:
047:            static final L10N L = new L10N(IncludeResponseStream.class);
048:
049:            private final AbstractHttpResponse _response;
050:
051:            private boolean _isCauchoResponseStream;
052:            private AbstractResponseStream _nextResponseStream;
053:
054:            private ServletResponse _next;
055:            private ServletOutputStream _os;
056:            private PrintWriter _writer;
057:
058:            private OutputStream _cacheStream;
059:            private Writer _cacheWriter;
060:
061:            public IncludeResponseStream(AbstractHttpResponse response) {
062:                _response = response;
063:            }
064:
065:            public void init(ServletResponse next) {
066:                _next = next;
067:
068:                if (_os != null || _writer != null)
069:                    throw new IllegalStateException();
070:
071:                if (_next instanceof  CauchoResponse) {
072:                    CauchoResponse response = (CauchoResponse) next;
073:
074:                    _isCauchoResponseStream = response.isCauchoResponseStream();
075:
076:                    if (_isCauchoResponseStream)
077:                        _nextResponseStream = response.getResponseStream();
078:                } else
079:                    _isCauchoResponseStream = false;
080:            }
081:
082:            public void start() {
083:                super .start();
084:
085:                try {
086:                    setEncoding(_next.getCharacterEncoding());
087:                } catch (Throwable e) {
088:                    log.log(Level.FINE, e.toString(), e);
089:                }
090:            }
091:
092:            /**
093:             * Returns true for a caucho response stream.
094:             */
095:            public boolean isCauchoResponseStream() {
096:                return _isCauchoResponseStream;
097:            }
098:
099:            /**
100:             * Set true for a caucho response stream.
101:             */
102:            public void setCauchoResponseStream(boolean isCaucho) {
103:                _isCauchoResponseStream = isCaucho;
104:            }
105:
106:            /**
107:             * Sets any cache stream.
108:             */
109:            public void setByteCacheStream(OutputStream cacheStream) {
110:                _cacheStream = cacheStream;
111:            }
112:
113:            /**
114:             * Sets any cache stream.
115:             */
116:            public void setCharCacheStream(Writer cacheWriter) {
117:                _cacheWriter = cacheWriter;
118:            }
119:
120:            /**
121:             * Converts the char buffer.
122:             */
123:            protected void flushCharBuffer() throws IOException {
124:                if (_isCauchoResponseStream && _nextResponseStream == null) {
125:                    // jsp/18ek
126:                    super .flushCharBuffer();
127:
128:                    return;
129:                }
130:
131:                try {
132:                    if (_writer == null)
133:                        _writer = _next.getWriter();
134:                } catch (Throwable e) {
135:                    log.log(Level.FINER, e.toString(), e);
136:                }
137:
138:                if (_writer != null) {
139:                    int charLength = getCharOffset();
140:                    setCharOffset(0);
141:                    char[] buffer = getCharBuffer();
142:
143:                    _response.startCaching(false);
144:
145:                    _writer.write(buffer, 0, charLength);
146:
147:                    if (_cacheWriter != null)
148:                        _cacheWriter.write(buffer, 0, charLength);
149:                } else
150:                    super .flushCharBuffer();
151:            }
152:
153:            /**
154:             * Sets the byte buffer offset.
155:             */
156:            public void setBufferOffset(int offset) throws IOException {
157:                super .setBufferOffset(offset);
158:
159:                if (!_isCauchoResponseStream)
160:                    flushByteBuffer();
161:            }
162:
163:            /**
164:             * Writes the next chunk of data to the response stream.
165:             *
166:             * @param buf the buffer containing the data
167:             * @param offset start offset into the buffer
168:             * @param length length of the data in the buffer
169:             */
170:            public void write(int ch) throws IOException {
171:                flushCharBuffer();
172:
173:                if (_isCauchoResponseStream) {
174:                    super .write(ch);
175:                } else {
176:                    if (_os == null)
177:                        _os = _next.getOutputStream();
178:
179:                    _os.write(ch);
180:                }
181:            }
182:
183:            /**
184:             * Writes the next chunk of data to the response stream.
185:             *
186:             * @param buf the buffer containing the data
187:             * @param offset start offset into the buffer
188:             * @param length length of the data in the buffer
189:             */
190:            public void write(byte[] buf, int offset, int length)
191:                    throws IOException {
192:                flushCharBuffer();
193:
194:                if (false && _isCauchoResponseStream) // jsp/15dv
195:                    super .write(buf, offset, length);
196:                else {
197:                    if (_os == null)
198:                        _os = _next.getOutputStream();
199:
200:                    _os.write(buf, offset, length);
201:                }
202:            }
203:
204:            /**
205:             * Writes the next chunk of data to the response stream.
206:             *
207:             * @param buf the buffer containing the data
208:             * @param offset start offset into the buffer
209:             * @param length length of the data in the buffer
210:             */
211:            @Override
212:            protected void writeNext(byte[] buf, int offset, int length,
213:                    boolean isEnd) throws IOException {
214:                try {
215:                    if (_response != null)
216:                        _response.writeHeaders(null, -1);
217:
218:                    if (length == 0)
219:                        return;
220:
221:                    if (_cacheStream != null)
222:                        _cacheStream.write(buf, offset, length);
223:
224:                    if (_os == null)
225:                        _os = _next.getOutputStream();
226:
227:                    _os.write(buf, offset, length);
228:                } catch (IOException e) {
229:                    if (_next instanceof  CauchoResponse)
230:                        ((CauchoResponse) _next).killCache();
231:
232:                    if (_response != null)
233:                        _response.killCache();
234:
235:                    throw e;
236:                }
237:            }
238:
239:            /**
240:             * flushing
241:             */
242:            public void flushByte() throws IOException {
243:                flushBuffer();
244:
245:                if (_os == null)
246:                    _os = _next.getOutputStream();
247:
248:                _os.flush();
249:            }
250:
251:            /**
252:             * flushing
253:             */
254:            public void flushChar() throws IOException {
255:                flushBuffer();
256:
257:                if (_writer == null)
258:                    _writer = _next.getWriter();
259:
260:                _writer.flush();
261:            }
262:
263:            /**
264:             * Finish.
265:             */
266:            public void finish() throws IOException {
267:                flushBuffer();
268:
269:                /*
270:                if (_writer != null)
271:                  _writer.flush();
272:                
273:                if (_os != null)
274:                  _os.flush();
275:                 */
276:
277:                _os = null;
278:                _writer = null;
279:                _next = null;
280:
281:                _cacheStream = null;
282:                _cacheWriter = null;
283:            }
284:
285:            /**
286:             * Close.
287:             */
288:            public void close() throws IOException {
289:                super .close();
290:
291:                /*
292:                if (_writer != null)
293:                  _writer.close();
294:                
295:                if (_os != null)
296:                  _os.close();
297:                 */
298:
299:                _os = null;
300:                _writer = null;
301:                _next = null;
302:
303:                _cacheStream = null;
304:                _cacheWriter = null;
305:            }
306:        }
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