Source Code Cross Referenced for BytesWrittenResetOutputStream.java in  » Web-Mail » james-2.3.1 » org » apache » james » util » watchdog » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Mail » james 2.3.1 » org.apache.james.util.watchdog 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /****************************************************************
002:         * Licensed to the Apache Software Foundation (ASF) under one   *
003:         * or more contributor license agreements.  See the NOTICE file *
004:         * distributed with this work for additional information        *
005:         * regarding copyright ownership.  The ASF licenses this file   *
006:         * to you under the Apache License, Version 2.0 (the            *
007:         * "License"); you may not use this file except in compliance   *
008:         * with the License.  You may obtain a copy of the License at   *
009:         *                                                              *
010:         *   http://www.apache.org/licenses/LICENSE-2.0                 *
011:         *                                                              *
012:         * Unless required by applicable law or agreed to in writing,   *
013:         * software distributed under the License is distributed on an  *
014:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015:         * KIND, either express or implied.  See the License for the    *
016:         * specific language governing permissions and limitations      *
017:         * under the License.                                           *
018:         ****************************************************************/package org.apache.james.util.watchdog;
019:
020:        import java.io.IOException;
021:        import java.io.OutputStream;
022:
023:        /**
024:         * This will reset the Watchdog each time a certain amount of data has
025:         * been transferred.  This allows us to keep the timeout settings low, while
026:         * not timing out during large data transfers.
027:         */
028:        public class BytesWrittenResetOutputStream extends OutputStream {
029:
030:            /**
031:             * The output stream wrapped by this method
032:             */
033:            OutputStream out = null;
034:
035:            /**
036:             * The Watchdog to be reset every lengthReset bytes
037:             */
038:            private Watchdog watchdog;
039:
040:            /**
041:             * The number of bytes that need to be written before the counter is reset.
042:             */
043:            int lengthReset = 0;
044:
045:            /**
046:             * The number of bytes written since the counter was last reset
047:             */
048:            int writtenCounter = 0;
049:
050:            public BytesWrittenResetOutputStream(OutputStream out,
051:                    Watchdog watchdog, int lengthReset) {
052:                this .out = out;
053:                this .watchdog = watchdog;
054:                this .lengthReset = lengthReset;
055:
056:                writtenCounter = 0;
057:            }
058:
059:            /**
060:             * Write an array of bytes to the stream
061:             *
062:             * @param b the array of bytes to write to the stream
063:             * @param off the index in the array where we start writing
064:             * @param len the number of bytes of the array to write
065:             *
066:             * @throws IOException if an exception is encountered when writing
067:             */
068:            public void write(byte[] b, int off, int len) throws IOException {
069:                out.write(b, off, len);
070:                writtenCounter += len;
071:
072:                if (writtenCounter > lengthReset) {
073:                    writtenCounter = 0;
074:                    watchdog.reset();
075:                }
076:            }
077:
078:            /**
079:             * Write a byte to the stream
080:             *
081:             * @param b the byte to write to the stream
082:             *
083:             * @throws IOException if an exception is encountered when writing
084:             */
085:            public void write(int b) throws IOException {
086:                out.write(b);
087:                writtenCounter++;
088:
089:                if (writtenCounter > lengthReset) {
090:                    writtenCounter = 0;
091:                    watchdog.reset();
092:                }
093:            }
094:
095:            /**
096:             * Flush the stream
097:             *
098:             * @throws IOException if an exception is encountered when flushing
099:             */
100:            public void flush() throws IOException {
101:                out.flush();
102:            }
103:
104:            /**
105:             * Close the stream
106:             *
107:             * @throws IOException if an exception is encountered when closing
108:             */
109:            public void close() throws IOException {
110:                out.close();
111:            }
112:        }
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