Source Code Cross Referenced for ErrorLogReader.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » diag » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.diag 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.diag.ErrorLogReader
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to You under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.diag;
023:
024:        import java.io.BufferedReader;
025:        import java.io.FileNotFoundException;
026:        import java.io.InputStream;
027:        import java.io.InputStreamReader;
028:        import java.io.FileInputStream;
029:
030:        import java.util.Hashtable;
031:        import java.util.Enumeration;
032:        import java.util.Properties;
033:        import java.sql.ResultSetMetaData;
034:        import java.sql.SQLException;
035:        import java.sql.Types;
036:        import org.apache.derby.vti.VTITemplate;
037:        import org.apache.derby.iapi.reference.Limits;
038:        import org.apache.derby.iapi.util.StringUtil;
039:
040:        import org.apache.derby.iapi.sql.ResultColumnDescriptor;
041:        import org.apache.derby.impl.jdbc.EmbedResultSetMetaData;
042:
043:        /**
044:
045:         ErrorLogReader is a virtual table interface (VTI) which contains all the statements
046:         of "interest" in db2j.<!-- -->log or a specified file when
047:         db2j.<!-- -->language.<!-- -->logStatementText=true.
048:        
049:        
050:         <P>One use of this VTI is to determine the active transactions
051:         and the SQL statements in those transactions at a given point in time, say
052:         when a deadlock or lock timeout occurred.  In order to do that, you must first
053:         find the timestamp (timestampConstant) of interest in the error log.  
054:         The SQL to view the active transactions at a given in time is:
055:         <PRE>SELECT vti.ts, threadid, cast(xid as int) as xid_int, cast(lccid as int) as lccid_int, logtext 
056:         FROM new org.apache.derby.diag.ErrorLogReader() vti, 
057:         (VALUES timestampConstant) t(ts)
058:         WHERE vti.ts <= t.ts AND 
059:         vti.ts >
060:         (SELECT MAX(ts) IS NULL ? '2000-01-01 00:00:00.1' : MAX(ts)
061:         FROM new org.apache.derby.diag.ErrorLogReader() vti_i
062:         WHERE (logtext LIKE 'Committing%' OR
063:         logtext LIKE 'Rolling%') AND
064:         vti.xid = vti_i.xid AND ts < t.ts)
065:         ORDER BY xid_int, vti.ts
066:         </PRE>
067:
068:         <P>The ErrorLogReader virtual table has the following columns:
069:         <UL><LI>TS varchar(26) - the timestamp of the statement.</LI>
070:         <LI>THREADID varchar(40) - the thread name.</LI>
071:         <LI>XID varchar(15) - the transaction ID.</LI>
072:         <LI>LCCID varchar(15) - the connection ID.</LI>
073:         <LI>DATABASE varchar(128) -  Database name
074:         <LI>DRDAID  varchar(50) - nullable. DRDA ID for network server session.
075:         <LI>LOGTEXT long varchar - text of the statement or commit or rollback.</LI>
076:         </UL>
077:
078:         */
079:        public class ErrorLogReader extends VTITemplate {
080:            /*
081:             ** private 
082:             */
083:            private boolean gotFile;
084:            private InputStreamReader inputFileStreamReader;
085:            private InputStream inputStream;
086:            private BufferedReader bufferedReader;
087:            private String inputFileName;
088:
089:            // Variables for current row
090:            private String line;
091:            private int gmtIndex;
092:            private int threadIndex;
093:            private int xidIndex;
094:            private int lccidIndex;
095:            private int databaseIndex;
096:            private int drdaidIndex;
097:
098:            private static final String GMT_STRING = " GMT";
099:            private static final String PARAMETERS_STRING = "Parameters:";
100:            private static final String BEGIN_THREAD_STRING = "[";
101:            private static final String END_THREAD_STRING = "]";
102:            private static final String BEGIN_XID_STRING = "= ";
103:            private static final String END_XID_STRING = ")";
104:            private static final String BEGIN_DATABASE_STRING = "(DATABASE =";
105:            private static final String END_DATABASE_STRING = ")";
106:            private static final String BEGIN_DRDAID_STRING = "(DRDAID =";
107:            private static final String END_DRDAID_STRING = ")";
108:            private static final String BEGIN_EXECUTING_STRING = "Executing prepared";
109:            private static final String END_EXECUTING_STRING = " :End prepared";
110:
111:            /**
112:            	ErrorLogReader() accesses the derby.log in
113:            	derby.system.home, if set, otherwise it looks in the current directory.
114:            	ErrorLogReader('filename') will access the specified
115:            	file name.
116:             */
117:            public ErrorLogReader() {
118:                String home = System.getProperty("derby.system.home");
119:
120:                inputFileName = "derby.log";
121:
122:                if (home != null) {
123:                    inputFileName = home + "/" + inputFileName;
124:                }
125:            }
126:
127:            public ErrorLogReader(String inputFileName) {
128:                this .inputFileName = inputFileName;
129:            }
130:
131:            /**
132:            	@see java.sql.ResultSet#getMetaData
133:             */
134:            public ResultSetMetaData getMetaData() {
135:                return metadata;
136:            }
137:
138:            /**
139:            	@see java.sql.ResultSet#next
140:            	@exception SQLException If database-access error occurs.
141:             */
142:            public boolean next() throws SQLException {
143:                if (!gotFile) {
144:                    gotFile = true;
145:                    try {
146:                        inputFileStreamReader = new InputStreamReader(
147:                                new FileInputStream(inputFileName));
148:                        bufferedReader = new BufferedReader(
149:                                inputFileStreamReader, 32 * 1024);
150:                    } catch (FileNotFoundException ex) {
151:                        throw new SQLException(ex.getMessage());
152:                    }
153:                }
154:
155:                while (true) {
156:                    try {
157:                        line = bufferedReader.readLine();
158:                    } catch (java.io.IOException ioe) {
159:                        throw new SQLException(ioe.getMessage());
160:                    }
161:
162:                    if (line == null) {
163:                        return false;
164:                    }
165:
166:                    gmtIndex = line.indexOf(GMT_STRING);
167:                    threadIndex = line.indexOf(BEGIN_THREAD_STRING);
168:                    xidIndex = line.indexOf(BEGIN_XID_STRING);
169:                    lccidIndex = line.indexOf(BEGIN_XID_STRING, xidIndex + 1);
170:                    databaseIndex = line.indexOf(BEGIN_DATABASE_STRING,
171:                            lccidIndex + 1);
172:                    drdaidIndex = line.indexOf(BEGIN_DRDAID_STRING,
173:                            databaseIndex + 1);
174:
175:                    // Skip parameters
176:                    if (line.indexOf(PARAMETERS_STRING) != -1) {
177:                        continue;
178:                    }
179:
180:                    if (gmtIndex != -1 && threadIndex != -1 && xidIndex != -1
181:                            && databaseIndex != -1) {
182:                        return true;
183:                    }
184:                }
185:            }
186:
187:            /**
188:            	@see java.sql.ResultSet#close
189:             */
190:            public void close() {
191:                if (bufferedReader != null) {
192:                    try {
193:                        bufferedReader.close();
194:                        inputFileStreamReader.close();
195:                    } catch (java.io.IOException ioe) {
196:                        // eat exceptions during close;
197:                    } finally {
198:                        bufferedReader = null;
199:                        inputFileStreamReader = null;
200:                    }
201:                }
202:            }
203:
204:            /**
205:            	All columns in the Db2jLogReader VTI have a of String type.
206:            	@see java.sql.ResultSet#getString
207:            	@exception SQLException If database-access error occurs.
208:             */
209:            public String getString(int columnNumber) throws SQLException {
210:                switch (columnNumber) {
211:                case 1:
212:                    return line.substring(0, gmtIndex);
213:
214:                case 2:
215:                    return line.substring(threadIndex + 1, line
216:                            .indexOf(END_THREAD_STRING));
217:
218:                case 3:
219:                    return line.substring(xidIndex + 2, line.indexOf(
220:                            END_XID_STRING, xidIndex));
221:
222:                case 4:
223:                    return line.substring(lccidIndex + 2, line.indexOf(
224:                            END_XID_STRING, lccidIndex));
225:
226:                case 5:
227:                    return line.substring(databaseIndex
228:                            + BEGIN_DATABASE_STRING.length(), line.indexOf(
229:                            END_DATABASE_STRING, databaseIndex));
230:                case 6:
231:                    return line.substring(drdaidIndex
232:                            + BEGIN_DRDAID_STRING.length(), line.indexOf(
233:                            END_DRDAID_STRING, drdaidIndex));
234:                case 7:
235:                    /* Executing prepared statement is a special case as
236:                     * it could span multiple lines
237:                     */
238:                    String output;
239:                    if (line.indexOf(BEGIN_EXECUTING_STRING) == -1) {
240:                        output = line.substring(line.indexOf(END_DRDAID_STRING,
241:                                drdaidIndex) + 3);
242:                    } else {
243:
244:                        /* We need to build string until we find the end of the text */
245:                        int endIndex = line.indexOf(END_EXECUTING_STRING,
246:                                drdaidIndex);
247:                        if (endIndex == -1) {
248:                            output = line.substring(line.indexOf(
249:                                    END_DRDAID_STRING, drdaidIndex) + 3);
250:                        } else {
251:                            output = line.substring(line.indexOf(
252:                                    END_XID_STRING, drdaidIndex) + 3, endIndex);
253:                        }
254:
255:                        while (endIndex == -1) {
256:                            try {
257:                                line = bufferedReader.readLine();
258:                            } catch (java.io.IOException ioe) {
259:                                throw new SQLException("Error reading file "
260:                                        + ioe);
261:                            }
262:                            endIndex = line.indexOf(END_EXECUTING_STRING);
263:                            if (endIndex == -1) {
264:                                output = output + line;
265:                            } else {
266:                                output = output + line.substring(0, endIndex);
267:                            }
268:                        }
269:                    }
270:
271:                    output = StringUtil.truncate(output,
272:                            Limits.DB2_VARCHAR_MAXWIDTH);
273:
274:                    return output;
275:
276:                default:
277:                    return "";
278:                }
279:            }
280:
281:            /**
282:            	@see java.sql.ResultSet#wasNull
283:             */
284:            public boolean wasNull() {
285:                return false;
286:            }
287:
288:            /* MetaData
289:             */
290:
291:            // column1: TS varchar(26) not null
292:            // column2: THREADID varchar(40) not null
293:            // column3: XID  varchar(15) not null
294:            // column4: LCCID  varchar(15) not null
295:            // column5: DATABASE varchar(128) not null
296:            // column6: DRDAID varchar(50) nullable
297:            // column5: LOGTEXT VARCHAR(max) not null
298:            private static final ResultColumnDescriptor[] columnInfo = {
299:                    EmbedResultSetMetaData.getResultColumnDescriptor("TS",
300:                            Types.VARCHAR, false, 26),
301:                    EmbedResultSetMetaData.getResultColumnDescriptor(
302:                            "THREADID", Types.VARCHAR, false, 40),
303:                    EmbedResultSetMetaData.getResultColumnDescriptor("XID",
304:                            Types.VARCHAR, false, 15),
305:                    EmbedResultSetMetaData.getResultColumnDescriptor("LCCID",
306:                            Types.VARCHAR, false, 15),
307:                    EmbedResultSetMetaData.getResultColumnDescriptor(
308:                            "DATABASE", Types.VARCHAR, false, 128),
309:                    EmbedResultSetMetaData.getResultColumnDescriptor("DRDAID",
310:                            Types.VARCHAR, true, 50),
311:                    EmbedResultSetMetaData.getResultColumnDescriptor("LOGTEXT",
312:                            Types.VARCHAR, false, Limits.DB2_VARCHAR_MAXWIDTH) };
313:            private static final ResultSetMetaData metadata = new EmbedResultSetMetaData(
314:                    columnInfo);
315:
316:        }
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