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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.classic.db;
import static ch.qos.logback.core.db.DBHelper.closeStatement;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import ch.qos.logback.classic.db.names.DBNameResolver;
import ch.qos.logback.classic.db.names.DefaultDBNameResolver;
import ch.qos.logback.classic.spi.*;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.db.DBAppenderBase;
/**
* The DBAppender inserts logging events into three database tables in a format
* independent of the Java programming language.
*
* For more information about this appender, please refer to the online manual
* at http://logback.qos.ch/manual/appenders.html#DBAppender
*
* @author Ceki Gülcü
* @author Ray DeCampo
* @author Sébastien Pennec
*/
public class DBAppender extends DBAppenderBase {
protected String insertPropertiesSQL;
protected String insertExceptionSQL;
protected String insertSQL;
protected static final Method GET_GENERATED_KEYS_METHOD;
private DBNameResolver dbNameResolver;
static final int TIMESTMP_INDEX = 1;
static final int FORMATTED_MESSAGE_INDEX = 2;
static final int LOGGER_NAME_INDEX = 3;
static final int LEVEL_STRING_INDEX = 4;
static final int THREAD_NAME_INDEX = 5;
static final int REFERENCE_FLAG_INDEX = 6;
static final int ARG0_INDEX = 7;
static final int ARG1_INDEX = 8;
static final int ARG2_INDEX = 9;
static final int ARG3_INDEX = 10;
static final int CALLER_FILENAME_INDEX = 11;
static final int CALLER_CLASS_INDEX = 12;
static final int CALLER_METHOD_INDEX = 13;
static final int CALLER_LINE_INDEX = 14;
static final int EVENT_ID_INDEX = 15;
static final StackTraceElement EMPTY_CALLER_DATA = CallerData.naInstance();
static {
// PreparedStatement.getGeneratedKeys() method was added in JDK 1.4
Method getGeneratedKeysMethod;
try {
// the
getGeneratedKeysMethod = PreparedStatement.class.getMethod("getGeneratedKeys", (Class[]) null);
} catch (Exception ex) {
getGeneratedKeysMethod = null;
}
GET_GENERATED_KEYS_METHOD = getGeneratedKeysMethod;
}
public void setDbNameResolver(DBNameResolver dbNameResolver) {
this.dbNameResolver = dbNameResolver;
}
@Override
public void start() {
if (dbNameResolver == null)
dbNameResolver = new DefaultDBNameResolver();
insertExceptionSQL = SQLBuilder.buildInsertExceptionSQL(dbNameResolver);
insertPropertiesSQL = SQLBuilder.buildInsertPropertiesSQL(dbNameResolver);
insertSQL = SQLBuilder.buildInsertSQL(dbNameResolver);
super.start();
}
@Override
protected void subAppend(ILoggingEvent event, Connection connection, PreparedStatement insertStatement) throws Throwable {
bindLoggingEventWithInsertStatement(insertStatement, event);
bindLoggingEventArgumentsWithPreparedStatement(insertStatement, event.getArgumentArray());
// This is expensive... should we do it every time?
bindCallerDataWithPreparedStatement(insertStatement, event.getCallerData());
int updateCount = insertStatement.executeUpdate();
if (updateCount != 1) {
addWarn("Failed to insert loggingEvent");
}
}
protected void secondarySubAppend(ILoggingEvent event, Connection connection, long eventId) throws Throwable {
Map mergedMap = mergePropertyMaps(event);
insertProperties(mergedMap, connection, eventId);
if (event.getThrowableProxy() != null) {
insertThrowable(event.getThrowableProxy(), connection, eventId);
}
}
void bindLoggingEventWithInsertStatement(PreparedStatement stmt, ILoggingEvent event) throws SQLException {
stmt.setLong(TIMESTMP_INDEX, event.getTimeStamp());
stmt.setString(FORMATTED_MESSAGE_INDEX, event.getFormattedMessage());
stmt.setString(LOGGER_NAME_INDEX, event.getLoggerName());
stmt.setString(LEVEL_STRING_INDEX, event.getLevel().toString());
stmt.setString(THREAD_NAME_INDEX, event.getThreadName());
stmt.setShort(REFERENCE_FLAG_INDEX, DBHelper.computeReferenceMask(event));
}
void bindLoggingEventArgumentsWithPreparedStatement(PreparedStatement stmt, Object[] argArray) throws SQLException {
int arrayLen = argArray != null ? argArray.length : 0;
for (int i = 0; i < arrayLen && i < 4; i++) {
stmt.setString(ARG0_INDEX + i, asStringTruncatedTo254(argArray[i]));
}
if (arrayLen < 4) {
for (int i = arrayLen; i < 4; i++) {
stmt.setString(ARG0_INDEX + i, null);
}
}
}
String asStringTruncatedTo254(Object o) {
String s = null;
if (o != null) {
s = o.toString();
}
if (s == null) {
return null;
}
if (s.length() <= 254) {
return s;
} else {
return s.substring(0, 254);
}
}
void bindCallerDataWithPreparedStatement(PreparedStatement stmt, StackTraceElement[] callerDataArray) throws SQLException {
StackTraceElement caller = extractFirstCaller(callerDataArray);
stmt.setString(CALLER_FILENAME_INDEX, caller.getFileName());
stmt.setString(CALLER_CLASS_INDEX, caller.getClassName());
stmt.setString(CALLER_METHOD_INDEX, caller.getMethodName());
stmt.setString(CALLER_LINE_INDEX, Integer.toString(caller.getLineNumber()));
}
private StackTraceElement extractFirstCaller(StackTraceElement[] callerDataArray) {
StackTraceElement caller = EMPTY_CALLER_DATA;
if (hasAtLeastOneNonNullElement(callerDataArray))
caller = callerDataArray[0];
return caller;
}
private boolean hasAtLeastOneNonNullElement(StackTraceElement[] callerDataArray) {
return callerDataArray != null && callerDataArray.length > 0 && callerDataArray[0] != null;
}
Map mergePropertyMaps(ILoggingEvent event) {
Map mergedMap = new HashMap();
// we add the context properties first, then the event properties, since
// we consider that event-specific properties should have priority over
// context-wide properties.
Map loggerContextMap = event.getLoggerContextVO().getPropertyMap();
Map mdcMap = event.getMDCPropertyMap();
if (loggerContextMap != null) {
mergedMap.putAll(loggerContextMap);
}
if (mdcMap != null) {
mergedMap.putAll(mdcMap);
}
return mergedMap;
}
@Override
protected Method getGeneratedKeysMethod() {
return GET_GENERATED_KEYS_METHOD;
}
@Override
protected String getInsertSQL() {
return insertSQL;
}
protected void insertProperties(Map mergedMap, Connection connection, long eventId) throws SQLException {
Set propertiesKeys = mergedMap.keySet();
if (propertiesKeys.size() > 0) {
PreparedStatement insertPropertiesStatement = null;
try {
insertPropertiesStatement = connection.prepareStatement(insertPropertiesSQL);
for (String key : propertiesKeys) {
String value = mergedMap.get(key);
insertPropertiesStatement.setLong(1, eventId);
insertPropertiesStatement.setString(2, key);
insertPropertiesStatement.setString(3, value);
if (cnxSupportsBatchUpdates) {
insertPropertiesStatement.addBatch();
} else {
insertPropertiesStatement.execute();
}
}
if (cnxSupportsBatchUpdates) {
insertPropertiesStatement.executeBatch();
}
} finally {
closeStatement(insertPropertiesStatement);
}
}
}
/**
* Add an exception statement either as a batch or execute immediately if
* batch updates are not supported.
*/
void updateExceptionStatement(PreparedStatement exceptionStatement, String txt, short i, long eventId) throws SQLException {
exceptionStatement.setLong(1, eventId);
exceptionStatement.setShort(2, i);
exceptionStatement.setString(3, txt);
if (cnxSupportsBatchUpdates) {
exceptionStatement.addBatch();
} else {
exceptionStatement.execute();
}
}
short buildExceptionStatement(IThrowableProxy tp, short baseIndex, PreparedStatement insertExceptionStatement, long eventId) throws SQLException {
StringBuilder buf = new StringBuilder();
ThrowableProxyUtil.subjoinFirstLine(buf, tp);
updateExceptionStatement(insertExceptionStatement, buf.toString(), baseIndex++, eventId);
int commonFrames = tp.getCommonFrames();
StackTraceElementProxy[] stepArray = tp.getStackTraceElementProxyArray();
for (int i = 0; i < stepArray.length - commonFrames; i++) {
StringBuilder sb = new StringBuilder();
sb.append(CoreConstants.TAB);
ThrowableProxyUtil.subjoinSTEP(sb, stepArray[i]);
updateExceptionStatement(insertExceptionStatement, sb.toString(), baseIndex++, eventId);
}
if (commonFrames > 0) {
StringBuilder sb = new StringBuilder();
sb.append(CoreConstants.TAB).append("... ").append(commonFrames).append(" common frames omitted");
updateExceptionStatement(insertExceptionStatement, sb.toString(), baseIndex++, eventId);
}
return baseIndex;
}
protected void insertThrowable(IThrowableProxy tp, Connection connection, long eventId) throws SQLException {
PreparedStatement exceptionStatement = null;
try {
exceptionStatement = connection.prepareStatement(insertExceptionSQL);
short baseIndex = 0;
while (tp != null) {
baseIndex = buildExceptionStatement(tp, baseIndex, exceptionStatement, eventId);
tp = tp.getCause();
}
if (cnxSupportsBatchUpdates) {
exceptionStatement.executeBatch();
}
} finally {
closeStatement(exceptionStatement);
}
}
}