Source Code Cross Referenced for HttpOutputStream.java in  » Web-Server » Quadcap-Web-Server » com » quadcap » http » server22 » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Quadcap Web Server » com.quadcap.http.server22 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.http.server22;
002:
003:        /* Copyright 1998 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        import java.io.ByteArrayOutputStream;
042:        import java.io.BufferedOutputStream;
043:        import java.io.IOException;
044:        import java.io.OutputStream;
045:
046:        import javax.servlet.ServletOutputStream;
047:
048:        import com.quadcap.net.server.WorkerOutputStream;
049:
050:        import com.quadcap.util.Debug;
051:
052:        /**
053:         * An output stream for writing servlet responses.  This is an
054:         * abstract class, to be implemented by a network services
055:         * implementor.  Servlet writers use the output stream to return data
056:         * to clients.  They access it via the ServletResponse's
057:         * getOutputStream method, available from within the servlet's service
058:         * method.  Subclasses of ServletOutputStream must provide an
059:         * implementation of the write(int) method.
060:         * <p>
061:         *
062:         * This implementation is friendly to servlets which return "small"
063:         * responses and don't compute Content-Length -- it will compute this
064:         * header for them automatically.
065:         *
066:         * @author Stan Bailes
067:         */
068:        public class HttpOutputStream extends ServletOutputStream {
069:            WorkerOutputStream os;
070:            HttpResponse res;
071:            ByteArrayOutputStream bos = new ByteArrayOutputStream();
072:            boolean committed = false;
073:            boolean autoFlush = true;
074:
075:            int bufferSize = 32 * 1024;
076:
077:            /**
078:             * Construct a new http output stream, attached to the specified
079:             * worker output stream.
080:             *
081:             * @param os the output stream.
082:             */
083:            public void reset(WorkerOutputStream os) {
084:                this .os = os;
085:                this .bos.reset();
086:                this .committed = false;
087:            }
088:
089:            /**
090:             * Write a byte to the stream
091:             *
092:             * @param b the byte
093:             */
094:            public void write(int b) throws IOException {
095:                if (committed) {
096:                    os.write(b);
097:                } else if (bos.size() >= bufferSize) {
098:                    res.writeHeaders();
099:                    bos.writeTo(os);
100:                    committed = true;
101:                    os.write(b);
102:                } else {
103:                    bos.write(b);
104:                }
105:            }
106:
107:            /**
108:             * Write a bunch of bytes in one shot.
109:             *
110:             * @param buf a buffer where those bytes live
111:             * @param off the position in the buffer of the first byte to write
112:             * @param len the number of bytes to write
113:             *
114:             * @exception IOException may be thrown
115:             */
116:            public void write(byte[] buf, int off, int len) throws IOException {
117:                if (committed) {
118:                    os.write(buf, off, len);
119:                } else if (bos.size() + len >= bufferSize) {
120:                    res.writeHeaders();
121:                    bos.writeTo(os);
122:                    committed = true;
123:                    os.write(buf, off, len);
124:                } else {
125:                    bos.write(buf, off, len);
126:                }
127:            }
128:
129:            /**
130:             * Flush any buffered output to tht client
131:             */
132:            public final void flushBuffered() throws IOException {
133:                if (!committed) {
134:                    int len = bos.size();
135:                    if (len > 0) {
136:                        res.maybeSetContentLength(len);
137:                    }
138:                    res.writeHeaders();
139:                    bos.writeTo(os);
140:                    committed = true;
141:                }
142:                os.flush();
143:            }
144:
145:            /**
146:             * Flush the underlying stream
147:             */
148:            public final void flush() throws IOException {
149:                flushBuffered();
150:            }
151:
152:            /**
153:             * Close does nothing, to prevent clients from closing streams when they
154:             * really don't want to
155:             */
156:            public final void close() throws IOException {
157:                flushBuffered();
158:            }
159:
160:            public final void reallyClose() throws IOException {
161:                os.close();
162:            }
163:
164:            /**
165:             * Discard any bytes written so far if possible, and return true if
166:             * we were able to do so.
167:             */
168:            public boolean discard() {
169:                if (!committed) {
170:                    bos.reset();
171:                    return true;
172:                }
173:                return false;
174:            }
175:
176:            /**
177:             * Set up the connection with the http response object so we can
178:             * control flushing the headers when we've reached our buffered
179:             * limit.
180:             *
181:             * @param res the http response object associated with this request
182:             */
183:            void setResponse(HttpResponse res) {
184:                this .res = res;
185:            }
186:
187:            /**
188:             * Return the underlying output stream
189:             */
190:            WorkerOutputStream getOutputStream() {
191:                return os;
192:            }
193:
194:            final void setBufferSize(int size) throws IllegalStateException {
195:                if (committed) {
196:                    throw new IllegalStateException(
197:                            "Response already committed");
198:                }
199:                this .bufferSize = size;
200:            }
201:
202:            final int getBufferSize() {
203:                return bufferSize;
204:            }
205:
206:            final boolean isCommitted() {
207:                return committed;
208:            }
209:
210:            final void reset() throws IllegalStateException {
211:                if (committed) {
212:                    throw new IllegalStateException(
213:                            "Response already committed");
214:                }
215:                bos.reset();
216:            }
217:
218:            final boolean getAutoFlush() {
219:                return autoFlush;
220:            }
221:
222:            final void setAutoFlush(boolean autoFlush) {
223:                this .autoFlush = autoFlush;
224:            }
225:
226:            public int getRemaining() {
227:                return bufferSize - bos.size();
228:            }
229:        }
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