Source Code Cross Referenced for NonblockingSocketInputStream.java in  » Web-Server » Rimfaxe-Web-Server » seda » nbio » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Server » Rimfaxe Web Server » seda.nbio 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * Copyright (c) 2000 by Matt Welsh and The Regents of the University of 
003:         * California. All rights reserved.
004:         *
005:         * Permission to use, copy, modify, and distribute this software and its
006:         * documentation for any purpose, without fee, and without written agreement is
007:         * hereby granted, provided that the above copyright notice and the following
008:         * two paragraphs appear in all copies of this software.
009:         * 
010:         * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
011:         * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
012:         * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
013:         * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
014:         * 
015:         * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
016:         * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
017:         * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
018:         * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
019:         * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
020:         *
021:         * Author: Matt Welsh <mdw@cs.berkeley.edu>
022:         * 
023:         */
024:
025:        package seda.nbio;
026:
027:        import java.io.*;
028:
029:        /**
030:         * Package-internal class implementing NonblockingInputStream for
031:         * nonblocking sockets.
032:         */
033:        class NonblockingSocketInputStream extends NonblockingInputStream {
034:
035:            private NBIOFileDescriptor fd;
036:            private boolean eof;
037:            private NonblockingSocketImpl impl;
038:            private byte temp[] = new byte[1];
039:
040:            private static final int SKIPBUFLEN = 4096;
041:
042:            /* Non-blocking read on the underlying socket. 
043:             * Returns -1 if EOF has been reached, 0 if no data is available, otherwise
044:             * the number of bytes read.
045:             */
046:            private native int nbSocketRead(byte b[], int off, int len)
047:                    throws IOException;
048:
049:            NonblockingSocketInputStream(NonblockingSocketImpl impl) {
050:                fd = impl.getFileDescriptor();
051:                this .impl = impl;
052:            }
053:
054:            /**
055:             * Perform a <b>blocking</b> read of one byte from this input stream.
056:             * Returns -1 if the end of the stream has been reached.
057:             * Use nbRead() to perform a non-blocking read of one byte. 
058:             */
059:            public int read() throws IOException {
060:                if (eof)
061:                    return -1;
062:                int n;
063:                // Spin until we read a byte -- ugly
064:                while ((n = read(temp, 0, 1)) == 0)
065:                    ;
066:                if (n < 0) {
067:                    eof = true;
068:                    return -1;
069:                }
070:                return temp[0] & 0xff;
071:            }
072:
073:            /**
074:             * Perform a non-blocking read of one byte from this input stream.
075:             * Returns -1 if no data is available, or throws an EOFException if the
076:             * end of the stream has been reached. Use read() to perform a blocking 
077:             * read of one byte.
078:             */
079:            public int nbRead() throws IOException {
080:                if (eof)
081:                    throw new EOFException("EOF on " + toString());
082:                int n = read(temp, 0, 1);
083:                if (n == 0)
084:                    return -1;
085:                if (n < 0) {
086:                    eof = true;
087:                    throw new EOFException("EOF on " + toString());
088:                }
089:                return temp[0] & 0xff;
090:            }
091:
092:            /**
093:             * Perform a non-blocking read of up to <code>b.length</code> bytes 
094:             * from the underlying stream. 
095:             *
096:             * @return The total number of bytes read into the buffer, 0 if 
097:             *         no data was available, or -1 if the end of the stream has
098:             *         been reached.
099:             *
100:             */
101:            public int read(byte b[]) throws IOException {
102:                return read(b, 0, b.length);
103:            }
104:
105:            /**
106:             * Perform a non-blocking read of up to <code>len</code> bytes from the 
107:             * underlying stream into the byte array <code>b</code> starting at offset 
108:             * <code>off</code>.
109:             *
110:             * @return The total number of bytes read into the buffer, 0 if 
111:             *         no data was available, or -1 if the end of the stream has
112:             *         been reached.
113:             */
114:            public int read(byte b[], int off, int len) throws IOException {
115:                if (eof)
116:                    return -1;
117:                int n = nbSocketRead(b, off, len);
118:                if (n < 0) {
119:                    eof = true;
120:                    return -1;
121:                }
122:                return n;
123:            }
124:
125:            /**
126:             * Skip n bytes of input. This is a <b>blocking</b> operation.
127:             */
128:            public long skip(long n) throws IOException {
129:                if (n <= 0)
130:                    return 0;
131:                int buflen = (int) Math.min(SKIPBUFLEN, n);
132:                byte data[] = new byte[buflen];
133:                while (n > 0) {
134:                    int r = read(data, 0, (int) Math.min((long) buflen, n));
135:                    if (r < 0)
136:                        break;
137:                    n -= r;
138:                }
139:                return n;
140:            }
141:
142:            public int available() throws IOException {
143:                return impl.available();
144:            }
145:
146:            public void close() throws IOException {
147:                impl.close();
148:            }
149:
150:        }
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