Source Code Cross Referenced for Fifo.java in  » Workflow-Engines » pegasus-2.1.0 » org » griphyn » vdl » invocation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » pegasus 2.1.0 » org.griphyn.vdl.invocation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file or a portion of this file is licensed under the terms of
003:         * the Globus Toolkit Public License, found in file GTPL, or at
004:         * http://www.globus.org/toolkit/download/license.html. This notice must
005:         * appear in redistributions of this file, with or without modification.
006:         *
007:         * Redistributions of this Software, with or without modification, must
008:         * reproduce the GTPL in: (1) the Software, or (2) the Documentation or
009:         * some other similar material which is provided with the Software (if
010:         * any).
011:         *
012:         * Copyright 1999-2004 University of Chicago and The University of
013:         * Southern California. All rights reserved.
014:         */
015:        package org.griphyn.vdl.invocation;
016:
017:        import java.util.*;
018:        import java.io.Writer;
019:        import java.io.IOException;
020:
021:        /**
022:         * This class is the container for a FIFO object. A FIFO, also known as
023:         * named pipe, does not consume space on the filesystem except for an
024:         * inode.
025:         *
026:         * @author Jens-S. Vöckler
027:         * @author Yong Zhao
028:         * @version $Revision: 50 $
029:         */
030:        public class Fifo extends Temporary {
031:            /**
032:             * optional message count for the FIFO.
033:             */
034:            protected int m_count;
035:
036:            /**
037:             * optional number of bytes read from FIFO.
038:             */
039:            protected long m_rsize;
040:
041:            /**
042:             * optional number of bytes written - but not to the FIFO. This
043:             * has to do with the message size that was created from the
044:             * original input message. 
045:             */
046:            protected long m_wsize;
047:
048:            /**
049:             * Default c'tor: Construct a hollow shell and allow further
050:             * information to be added later.
051:             */
052:            public Fifo() {
053:                super ();
054:                m_count = 0;
055:                m_rsize = m_wsize = 0;
056:            }
057:
058:            /**
059:             * Constructs a FIFO object.
060:             * @param filename is the name of the file that stat was invoked
061:             * @param descriptor is a valid file descriptor number. 
062:             */
063:            public Fifo(String filename, int descriptor) {
064:                super (filename, descriptor);
065:                m_count = 0;
066:                m_rsize = m_wsize = 0;
067:            }
068:
069:            /**
070:             * Accessor
071:             *
072:             * @see #setCount(int)
073:             */
074:            public int getCount() {
075:                return this .m_count;
076:            }
077:
078:            /**
079:             * Accessor.
080:             *
081:             * @param count
082:             * @see #getCount()
083:             */
084:            public void setCount(int count) {
085:                this .m_count = count;
086:            }
087:
088:            /**
089:             * Accessor
090:             *
091:             * @see #setInputSize(long)
092:             */
093:            public long getInputSize() {
094:                return this .m_rsize;
095:            }
096:
097:            /**
098:             * Accessor.
099:             *
100:             * @param rsize
101:             * @see #getInputSize()
102:             */
103:            public void setInputSize(long rsize) {
104:                this .m_rsize = rsize;
105:            }
106:
107:            /**
108:             * Accessor
109:             *
110:             * @see #setOutputSize(long)
111:             */
112:            public long getOutputSize() {
113:                return this .m_wsize;
114:            }
115:
116:            /**
117:             * Accessor.
118:             *
119:             * @param wsize
120:             * @see #getOutputSize()
121:             */
122:            public void setOutputSize(long wsize) {
123:                this .m_wsize = wsize;
124:            }
125:
126:            /**
127:             * Dump the state of the current element as XML output. This function
128:             * traverses all sibling classes as necessary, and converts the data
129:             * into pretty-printed XML output. The stream interface should be able
130:             * to handle large output efficiently.
131:             *
132:             * @param stream is a stream opened and ready for writing. This can also
133:             * be a string stream for efficient output.
134:             * @param indent is a <code>String</code> of spaces used for pretty
135:             * printing. The initial amount of spaces should be an empty string.
136:             * The parameter is used internally for the recursive traversal.
137:             * If a <code>null</code> value is specified, no indentation nor
138:             * linefeeds will be generated. 
139:             * @param namespace is the XML schema namespace prefix. If neither
140:             * empty nor null, each element will be prefixed with this prefix,
141:             * and the root element will map the XML namespace. 
142:             * @exception IOException if something fishy happens to the stream.
143:             */
144:            public void toXML(Writer stream, String indent, String namespace)
145:                    throws IOException {
146:                String tag = (namespace != null && namespace.length() > 0) ? namespace
147:                        + ":fifo"
148:                        : "fifo";
149:
150:                // open tag
151:                if (indent != null && indent.length() > 0)
152:                    stream.write(indent);
153:                stream.write('<');
154:                stream.write(tag);
155:                writeAttribute(stream, " name=\"", m_filename);
156:                writeAttribute(stream, " descriptor=\"", Integer
157:                        .toString(m_descriptor));
158:                writeAttribute(stream, " count=\"", Integer.toString(m_count));
159:                writeAttribute(stream, " rsize=\"", Long.toString(m_rsize));
160:                writeAttribute(stream, " wsize=\"", Long.toString(m_wsize));
161:
162:                if (m_hexbyte != null && m_hexbyte.length() > 0) {
163:                    // yes, content
164:                    stream.write('>');
165:                    stream.write(m_hexbyte);
166:                    stream.write("</");
167:                    stream.write(tag);
168:                    stream.write('>');
169:                } else {
170:                    // no content
171:                    stream.write("/>");
172:                }
173:
174:                if (indent != null)
175:                    stream.write(System.getProperty("line.separator", "\r\n"));
176:            }
177:        }
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