Source Code Cross Referenced for NonblockingInputStream.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) 


01:        /* 
02:         * Copyright (c) 2000 by Matt Welsh and The Regents of the University of 
03:         * California. All rights reserved.
04:         *
05:         * Permission to use, copy, modify, and distribute this software and its
06:         * documentation for any purpose, without fee, and without written agreement is
07:         * hereby granted, provided that the above copyright notice and the following
08:         * two paragraphs appear in all copies of this software.
09:         * 
10:         * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
11:         * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
12:         * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
13:         * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
14:         * 
15:         * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
16:         * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17:         * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
18:         * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
19:         * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
20:         *
21:         * Author: Matt Welsh <mdw@cs.berkeley.edu>
22:         * 
23:         */
24:
25:        package seda.nbio;
26:
27:        import java.io.*;
28:
29:        /**
30:         * A NonblockingInputStream is an InputStream which implements nonblocking
31:         * semantics. The only additional method is nbRead() which performs a
32:         * nonblocking read of one byte. The read(byte[]) and read(byte[], int, int)
33:         * methods are also nonblocking. The standard read(byte) call is blocking
34:         * as there is no way to indicate that nothing was read (a -1 means
35:         * an error occurred). 
36:         */
37:        public abstract class NonblockingInputStream extends InputStream {
38:
39:            /**
40:             * Perform a <b>blocking</b> read of one byte from this input stream.
41:             * Returns -1 if the end of the stream has been reached.
42:             * Use nbRead() to perform a non-blocking read of one byte. 
43:             */
44:            public abstract int read() throws IOException;
45:
46:            /**
47:             * Perform a non-blocking read of one byte from this input stream.
48:             * Returns -1 if no data is available, or throws an EOFException if the
49:             * end of the stream has been reached. Use read() to perform a blocking 
50:             * read of one byte.
51:             */
52:            public abstract int nbRead() throws IOException;
53:
54:            /**
55:             * Perform a non-blocking read of up to <code>b.length</code> bytes 
56:             * from the underlying stream. 
57:             *
58:             * @return The total number of bytes read into the buffer, 0 if 
59:             *         no data was available, or -1 if the end of the stream has
60:             *         been reached.
61:             *
62:             */
63:            public abstract int read(byte b[]) throws IOException;
64:
65:            /**
66:             * Perform a non-blocking read of up to <code>len</code> bytes from the 
67:             * underlying stream into the byte array <code>b</code> starting at offset 
68:             * <code>off</code>.
69:             *
70:             * @return The total number of bytes read into the buffer, 0 if 
71:             *         no data was available, or -1 if the end of the stream has
72:             *         been reached.
73:             */
74:            public abstract int read(byte b[], int off, int len)
75:                    throws IOException;
76:
77:            /**
78:             * Skip n bytes of input. This is a <b>blocking</b> operation.
79:             */
80:            public abstract long skip(long n) throws IOException;
81:
82:            public abstract int available() throws IOException;
83:
84:            public abstract void close() throws IOException;
85:
86:        }
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