Source Code Cross Referenced for DerbyLogGBean.java in  » EJB-Server-geronimo » plugins » org » apache » geronimo » derby » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server geronimo » plugins » org.apache.geronimo.derby 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /**
002:         *  Licensed to the Apache Software Foundation (ASF) under one or more
003:         *  contributor license agreements.  See the NOTICE file distributed with
004:         *  this work for additional information regarding copyright ownership.
005:         *  The ASF licenses this file to You under the Apache License, Version 2.0
006:         *  (the "License"); you may not use this file except in compliance with
007:         *  the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         *  Unless required by applicable law or agreed to in writing, software
012:         *  distributed under the License is distributed on an "AS IS" BASIS,
013:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         *  See the License for the specific language governing permissions and
015:         *  limitations under the License.
016:         */package org.apache.geronimo.derby;
017:
018:        import org.apache.geronimo.gbean.GBeanInfo;
019:        import org.apache.geronimo.gbean.GBeanInfoBuilder;
020:
021:        import java.io.File;
022:        import java.io.RandomAccessFile;
023:        import java.nio.CharBuffer;
024:        import java.nio.MappedByteBuffer;
025:        import java.nio.channels.FileChannel;
026:        import java.nio.charset.Charset;
027:        import java.util.LinkedList;
028:        import java.util.List;
029:        import java.util.regex.Matcher;
030:        import java.util.regex.Pattern;
031:        import java.util.regex.PatternSyntaxException;
032:
033:        /**
034:         * ReplaceMe
035:         *
036:         * @version $Rev: 476049 $ $Date: 2006-11-16 20:35:17 -0800 (Thu, 16 Nov 2006) $
037:         */
038:        public class DerbyLogGBean implements  DerbyLog {
039:            // Pattern that matches a single line  (used to calculate line numbers and text search in a line)
040:            private final static Pattern FULL_LINE_PATTERN = Pattern.compile(
041:                    "^.*", Pattern.MULTILINE);
042:            private final DerbySystem derby;
043:            private File logFile = null;
044:
045:            public DerbyLogGBean(DerbySystem derby) {
046:                this .derby = derby;
047:            }
048:
049:            public SearchResults searchLog(Integer startLine, Integer endLine,
050:                    Integer max, String text) {
051:                // Get log file
052:                if (logFile == null) {
053:                    logFile = new File(derby.getDerbyHome(), "derby.log");
054:                    if (!logFile.canRead()) {
055:                        throw new IllegalStateException(
056:                                "Cannot read Derby log file at '"
057:                                        + logFile.getAbsolutePath() + "'");
058:                    }
059:                }
060:                // Check that the text pattern is valid
061:                Pattern textPattern;
062:                try {
063:                    textPattern = text == null || text.equals("") ? null
064:                            : Pattern.compile(text);
065:                } catch (PatternSyntaxException e) {
066:                    throw new IllegalArgumentException(
067:                            "Bad regular expression '" + text + "'");
068:                }
069:                return searchFile(logFile, textPattern, startLine, endLine,
070:                        max == null ? MAX_SEARCH_RESULTS : Math.min(
071:                                MAX_SEARCH_RESULTS, max.intValue()));
072:            }
073:
074:            private static SearchResults searchFile(File file,
075:                    Pattern textSearch, Integer start, Integer stop, int max) {
076:                List list = new LinkedList();
077:                boolean capped = false;
078:                int lineCount = 0;
079:                try {
080:                    RandomAccessFile raf = new RandomAccessFile(file, "r");
081:                    FileChannel fc = raf.getChannel();
082:                    MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY,
083:                            0, fc.size());
084:                    CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Derby use a different charset on a foreign PC?
085:                    Matcher lines = FULL_LINE_PATTERN.matcher(cb);
086:                    Matcher text = textSearch == null ? null : textSearch
087:                            .matcher("");
088:                    max = Math.min(max, MAX_SEARCH_RESULTS);
089:                    while (lines.find()) {
090:                        ++lineCount;
091:                        if (start != null && start.intValue() > lineCount) {
092:                            continue;
093:                        }
094:                        if (stop != null && stop.intValue() < lineCount) {
095:                            continue;
096:                        }
097:                        CharSequence line = cb.subSequence(lines.start(), lines
098:                                .end());
099:                        if (text != null) {
100:                            text.reset(line);
101:                            if (!text.find()) {
102:                                continue;
103:                            }
104:                        }
105:                        list.add(new LogMessage(lineCount, line.toString()));
106:                        if (list.size() > max) {
107:                            list.remove(0);
108:                            capped = true;
109:                        }
110:                    }
111:                    fc.close();
112:                    raf.close();
113:                } catch (Exception e) {
114:                }
115:                return new SearchResults(lineCount, (LogMessage[]) list
116:                        .toArray(new LogMessage[list.size()]), capped);
117:            }
118:
119:            public static final GBeanInfo GBEAN_INFO;
120:
121:            static {
122:                GBeanInfoBuilder infoFactory = GBeanInfoBuilder.createStatic(
123:                        "Derby Log", DerbyLogGBean.class);
124:
125:                infoFactory.addReference("DerbySystem", DerbySystem.class,
126:                        "GBean");
127:                infoFactory.addInterface(DerbyLog.class);
128:                infoFactory.setConstructor(new String[] { "DerbySystem" });
129:
130:                GBEAN_INFO = infoFactory.getBeanInfo();
131:            }
132:
133:            public static GBeanInfo getGBeanInfo() {
134:                return GBEAN_INFO;
135:            }
136:        }
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