Source Code Cross Referenced for MessageInputStream.java in  » Net » james-2.3.1 » org » apache » james » mailrepository » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » james 2.3.1 » org.apache.james.mailrepository 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.james.mailrepository;
002:
003:        import org.apache.avalon.cornerstone.services.store.StreamRepository;
004:        import org.apache.james.core.MimeMessageUtil;
005:        import org.apache.mailet.Mail;
006:
007:        import javax.mail.MessagingException;
008:
009:        import java.io.ByteArrayInputStream;
010:        import java.io.ByteArrayOutputStream;
011:        import java.io.IOException;
012:        import java.io.InputStream;
013:        import java.io.OutputStream;
014:        import java.io.PipedInputStream;
015:        import java.io.PipedOutputStream;
016:
017:        /**
018:         * This class provides an inputStream for a Mail object.
019:         * If the Mail is larger than 4KB it uses Piped streams and a worker threads
020:         * Otherwise it simply create a temporary byte buffer and does not create
021:         * the worker thread.
022:         * 
023:         * Note: Javamail (or the Activation Framework) already uses a worker threads when
024:         * asked for an inputstream.
025:         */
026:        final class MessageInputStream extends InputStream {
027:
028:            /**
029:             * The size of the current message
030:             */
031:            private long size = -1;
032:            /**
033:             * The wrapped stream (Piped or Binary)
034:             */
035:            private InputStream wrapped;
036:            /**
037:             * If an excaption happens in the worker threads it's stored here
038:             */
039:            private Exception caughtException;
040:            /**
041:             * Stream repository used for dbfiles (null otherwise)
042:             */
043:            private StreamRepository streamRep;
044:
045:            /**
046:             * Main constructor. If srep is not null than we are using dbfiles and we stream
047:             * the body to file and only the header to db.
048:             */
049:            public MessageInputStream(Mail mc, StreamRepository srep,
050:                    int sizeLimit) throws IOException, MessagingException {
051:                super ();
052:                caughtException = null;
053:                streamRep = srep;
054:                size = mc.getMessageSize();
055:                // we use the pipes only when streamRep is null and the message size is greater than 4096
056:                // Otherwise we should calculate the header size and not the message size when streamRep is not null (JAMES-475)
057:                if (streamRep == null && size > sizeLimit) {
058:                    PipedOutputStream headerOut = new PipedOutputStream();
059:                    new Thread() {
060:                        private Mail mail;
061:
062:                        private PipedOutputStream out;
063:
064:                        public void run() {
065:                            try {
066:                                writeStream(mail, out);
067:                            } catch (IOException e) {
068:                                caughtException = e;
069:                            } catch (MessagingException e) {
070:                                caughtException = e;
071:                            }
072:                        }
073:
074:                        public Thread setParam(Mail mc,
075:                                PipedOutputStream headerOut) {
076:                            this .mail = mc;
077:                            this .out = headerOut;
078:                            return this ;
079:                        }
080:                    }.setParam(mc, (PipedOutputStream) headerOut).start();
081:                    wrapped = new PipedInputStream(headerOut);
082:                } else {
083:                    ByteArrayOutputStream headerOut = new ByteArrayOutputStream();
084:                    writeStream(mc, headerOut);
085:                    wrapped = new ByteArrayInputStream(headerOut.toByteArray());
086:                    size = headerOut.size();
087:                }
088:            }
089:
090:            /**
091:             * Returns the size of the full message
092:             */
093:            public long getSize() {
094:                return size;
095:            }
096:
097:            /**
098:             * write the full mail to the stream
099:             * This can be used by this object or by the worker threads.
100:             */
101:            private void writeStream(Mail mail, OutputStream out)
102:                    throws IOException, MessagingException {
103:                OutputStream bodyOut = null;
104:                try {
105:                    if (streamRep == null) {
106:                        //If there is no filestore, use the byte array to store headers
107:                        //  and the body
108:                        bodyOut = out;
109:                    } else {
110:                        //Store the body in the stream repository
111:                        bodyOut = streamRep.put(mail.getName());
112:                    }
113:
114:                    //Write the message to the headerOut and bodyOut.  bodyOut goes straight to the file
115:                    MimeMessageUtil.writeTo(mail.getMessage(), out, bodyOut);
116:                    out.flush();
117:                    bodyOut.flush();
118:
119:                } finally {
120:                    closeOutputStreams(out, bodyOut);
121:                }
122:            }
123:
124:            private void throwException() throws IOException {
125:                try {
126:                    if (wrapped == null) {
127:                        throw new IOException(
128:                                "wrapped stream does not exists anymore");
129:                    } else if (caughtException instanceof  IOException) {
130:                        throw (IOException) caughtException;
131:                    } else {
132:                        throw new IOException(
133:                                "Exception caugth in worker thread "
134:                                        + caughtException.getMessage()) {
135:                            /**
136:                             * @see java.lang.Throwable#getCause()
137:                             */
138:                            public Throwable getCause() {
139:                                return caughtException;
140:                            }
141:                        };
142:                    }
143:                } finally {
144:                    caughtException = null;
145:                    wrapped = null;
146:                }
147:            }
148:
149:            /**
150:             * Closes output streams used to update message
151:             * 
152:             * @param headerStream the stream containing header information - potentially the same
153:             *               as the body stream
154:             * @param bodyStream the stream containing body information
155:             * @throws IOException 
156:             */
157:            private void closeOutputStreams(OutputStream headerStream,
158:                    OutputStream bodyStream) throws IOException {
159:                try {
160:                    // If the header stream is not the same as the body stream,
161:                    // close the header stream here.
162:                    if ((headerStream != null) && (headerStream != bodyStream)) {
163:                        headerStream.close();
164:                    }
165:                } finally {
166:                    if (bodyStream != null) {
167:                        bodyStream.close();
168:                    }
169:                }
170:            }
171:
172:            // wrapper methods
173:
174:            /**
175:             * @see java.io.InputStream#available()
176:             */
177:            public int available() throws IOException {
178:                if (caughtException != null || wrapped == null) {
179:                    throwException();
180:                }
181:                return wrapped.available();
182:            }
183:
184:            /**
185:             * @see java.io.Closeable#close()
186:             */
187:            public void close() throws IOException {
188:                if (caughtException != null || wrapped == null) {
189:                    throwException();
190:                }
191:                wrapped.close();
192:                wrapped = null;
193:            }
194:
195:            /**
196:             * @see java.io.InputStream#mark(int)
197:             */
198:            public synchronized void mark(int arg0) {
199:                wrapped.mark(arg0);
200:            }
201:
202:            /**
203:             * @see java.io.InputStream#markSupported()
204:             */
205:            public boolean markSupported() {
206:                return wrapped.markSupported();
207:            }
208:
209:            /**
210:             * @see java.io.InputStream#read(byte[], int, int)
211:             */
212:            public int read(byte[] arg0, int arg1, int arg2) throws IOException {
213:                if (caughtException != null || wrapped == null) {
214:                    throwException();
215:                }
216:                return wrapped.read(arg0, arg1, arg2);
217:            }
218:
219:            /**
220:             * @see java.io.InputStream#read(byte[])
221:             */
222:            public int read(byte[] arg0) throws IOException {
223:                if (caughtException != null || wrapped == null) {
224:                    throwException();
225:                }
226:                return wrapped.read(arg0);
227:            }
228:
229:            /**
230:             * @see java.io.InputStream#reset()
231:             */
232:            public synchronized void reset() throws IOException {
233:                if (caughtException != null || wrapped == null) {
234:                    throwException();
235:                }
236:                wrapped.reset();
237:            }
238:
239:            /**
240:             * @see java.io.InputStream#skip(long)
241:             */
242:            public long skip(long arg0) throws IOException {
243:                if (caughtException != null || wrapped == null) {
244:                    throwException();
245:                }
246:                return wrapped.skip(arg0);
247:            }
248:
249:            /**
250:             * @see java.io.InputStream#read()
251:             */
252:            public int read() throws IOException {
253:                if (caughtException != null || wrapped == null) {
254:                    throwException();
255:                }
256:                return wrapped.read();
257:            }
258:
259:        }
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