java.lang.Object
- com.tsurugidb.iceaxe.session.event.logging.TsurugiSessionTxLogger

All Implemented Interfaces:

TsurugiSessionEventListener

Direct Known Subclasses:

TsurugiSessionTxFileLogger
```
public class TsurugiSessionTxLogger
extends java.lang.Object
implements TsurugiSessionEventListener
```
Tsurugi transaction logger.

Constructor Summary

Constructors
Constructor Description

TsurugiSessionTxLogger()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`closeSession(TsurugiSession session, long timeoutNanos, java.lang.Throwable occurred)`	called when close session.
`<P,R> void`	`createQuery(TsurugiSqlPreparedQuery<P,R> ps)`	called when create prepared query.
`<R> void`	`createQuery(TsurugiSqlQuery<R> ps)`	called when create query.
`<P> void`	`createStatement(TsurugiSqlPreparedStatement<P> ps)`	called when create prepared statement.
`void`	`createStatement(TsurugiSqlStatement ps)`	called when create statement.
`protected TgSessionTmLog`	`createTmLog()`	Creates a new transaction manager execute log.
`void`	`createTransaction(TsurugiTransaction transaction)`	called when create transaction.
`void`	`createTransactionManager(TsurugiTransactionManager tm)`	called when create transaction manager.
`protected TgSessionTxLog`	`createTxLog()`	Creates a new transaction log instance.
`protected void`	`doLogSqlClose(TsurugiTransaction transaction, TsurugiSqlResult result, java.lang.Throwable occurred)`	do SQL result close.
`protected void`	`doLogSqlEnd(TsurugiTransaction transaction, TsurugiSqlResult result, java.lang.Throwable occurred)`	do SQL execute end.
`protected <R> void`	`doLogSqlRead(TsurugiTransaction transaction, TsurugiQueryResult<R> result, R record)`	do SQL read.
`protected <R> void`	`doLogSqlReadException(TsurugiTransaction transaction, TsurugiQueryResult<R> result, java.lang.Throwable occurred)`	do SQL read error.
`protected void`	`doLogSqlStart(TsurugiTransaction transaction, int iceaxeSqlExecuteId, TsurugiSql ps, java.lang.Object parameter)`	do SQL start.
`protected void`	`doLogSqlStarted(TsurugiTransaction transaction, TsurugiSqlResult result)`	do SQL execute started.
`protected void`	`doLogSqlStartException(TsurugiTransaction transaction, int iceaxeSqlExecuteId, java.lang.Throwable occurred)`	do SQL execute start error.
`protected void`	`doLogTmExecuteEnd(int iceaxeTmExecuteId, TsurugiTransaction transaction, boolean committed, java.lang.Object returnValue, java.lang.Throwable occurred)`	do transactionManager execute end.
`protected void`	`doLogTmExecuteException(TsurugiTransaction transaction, java.lang.Throwable occurred)`	do transactionManager execute error.
`protected void`	`doLogTmExecuteRetry(TsurugiTransaction transaction, java.lang.Exception cause, TgTmTxOption nextTmOption)`	do transactionManager execute retry.
`protected void`	`doLogTmExecuteStart(int iceaxeTmExecuteId)`	do transactionManager execute start.
`protected void`	`doLogTransactionClose(TsurugiTransaction transaction, java.lang.Throwable occurred)`	do transaction close.
`protected void`	`doLogTransactionCommitEnd(TsurugiTransaction transaction, TgCommitType commitType, java.lang.Throwable occurred)`	do commit end.
`protected void`	`doLogTransactionCommitStart(TsurugiTransaction transaction, TgCommitType commitType)`	do commit start.
`protected void`	`doLogTransactionRollbackEnd(TsurugiTransaction transaction, java.lang.Throwable occurred)`	do rollback end.
`protected void`	`doLogTransactionRollbackStart(TsurugiTransaction transaction)`	do rollback start.
`protected void`	`doLogTransactionSqlEnd(TsurugiTransaction transaction, TsurugiTransaction.TgTxMethod method, int iceaxeTxExecuteId, TsurugiSql ps, java.lang.Object parameter, TsurugiSqlResult result, java.lang.Throwable occurred)`	do execute SQL end.
`protected void`	`doLogTransactionSqlStart(TsurugiTransaction transaction, TsurugiTransaction.TgTxMethod method, int iceaxeTxExecuteId, TsurugiSql ps, java.lang.Object parameter)`	do execute SQL start.
`protected void`	`doLogTransactionStart(TsurugiTransaction transaction, java.time.ZonedDateTime startTime)`	do transaction start.
`protected void`	`doLowTransactionGetEnd(TsurugiTransaction transaction, java.lang.String transactionId, java.lang.Throwable occurred)`	do get transactionId.
`protected void`	`doLowTransactionGetStart(TsurugiTransaction transaction)`	do get transactionId.
`protected TgSessionTmLog`	`getTmLog(int iceaxeTmExecuteId)`	get transaction manager execute log.
`protected TgSessionTxLog`	`getTxLog(TsurugiTransaction transaction)`	get transaction log.
`protected void`	`logCreateSqlStatement(TsurugiSql ps)`	called when create SQL definition.
`protected void`	`logLowTransactionGetEnd(TgSessionTxLog txLog, java.lang.String transactionId, java.lang.Throwable occurred)`	called when get transactionId.
`protected void`	`logLowTransactionGetStart(TgSessionTxLog txLog)`	called when get transactionId.
`protected void`	`logSessionClose(TsurugiSession session, java.lang.Throwable occurred)`	called when close session.
`protected void`	`logSessionShutdown(TsurugiSession session, TgSessionShutdownType shutdownType, java.lang.Throwable occurred)`	called when shutdown session.
`protected void`	`logSqlClose(TgSessionTxLog txLog, TgSessionSqlLog sqlLog, java.lang.Throwable occurred)`	called when SQL result close.
`protected void`	`logSqlEnd(TgSessionTxLog txLog, TgSessionSqlLog sqlLog, java.lang.Throwable occurred)`	called when SQL execute end.
`protected <R> void`	`logSqlRead(TgSessionTxLog txLog, TgSessionSqlLog sqlLog, TsurugiQueryResult<R> result, R record)`	called when SQL read.
`protected <R> void`	`logSqlReadException(TgSessionTxLog txLog, TgSessionSqlLog sqlLog, TsurugiQueryResult<R> result, java.lang.Throwable occurred)`	called when occurs exception SQL read.
`protected void`	`logSqlStart(TgSessionTxLog txLog, TgSessionSqlLog sqlLog)`	called when SQL execute start.
`protected void`	`logSqlStarted(TgSessionTxLog txLog, TgSessionSqlLog sqlLog)`	called when SQL execute started.
`protected void`	`logSqlStartException(TgSessionTxLog txLog, TgSessionSqlLog sqlLog, java.lang.Throwable occurred)`	called when occurs exception SQL execute start.
`protected void`	`logTmExecuteEnd(TgSessionTmLog tmLog, java.lang.Throwable occurred)`	called when transactionManager execute end.
`protected void`	`logTmExecuteException(TgSessionTxLog txLog, java.lang.Throwable occurred)`	called when occurs transactionManager execute error.
`protected void`	`logTmExecuteRetry(TgSessionTxLog txLog, java.lang.Exception cause, TgTmTxOption nextTmOption)`	called when transactionManager execute retry.
`protected void`	`logTmExecuteStart(TgSessionTmLog tmLog)`	called when transactionManager execute start.
`protected void`	`logTransactionClose(TgSessionTxLog txLog, java.lang.Throwable occurred)`	called when transaction close.
`protected void`	`logTransactionCommitEnd(TgSessionTxLog txLog, TgCommitType commitType, java.lang.Throwable occurred)`	called when commit end.
`protected void`	`logTransactionCommitStart(TgSessionTxLog txLog, TgCommitType commitType)`	called when commit start.
`protected void`	`logTransactionRollbackEnd(TgSessionTxLog txLog, java.lang.Throwable occurred)`	called when rollback end.
`protected void`	`logTransactionRollbackStart(TgSessionTxLog txLog)`	called when rollback start.
`protected void`	`logTransactionSqlEnd(TsurugiTransaction.TgTxMethod method, TgSessionTxLog txLog, TgSessionTxLog.TgSessionTxExecuteLog exLog, TsurugiSql ps, java.lang.Object parameter, TsurugiSqlResult result, java.lang.Throwable occurred)`	called when execute SQL end.
`protected void`	`logTransactionSqlStart(TsurugiTransaction.TgTxMethod method, TgSessionTxLog txLog, TgSessionTxLog.TgSessionTxExecuteLog exLog, TsurugiSql ps, java.lang.Object parameter)`	called when execute SQL start.
`protected void`	`logTransactionStart(TgSessionTxLog txLog)`	called when transaction start.
`void`	`shutdownSession(TsurugiSession session, TgSessionShutdownType shutdownType, long timeoutNanos, java.lang.Throwable occurred)`	called when shutdown session.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- TsurugiSessionTxLogger
```
public TsurugiSessionTxLogger()
```

Method Detail

createQuery
```
public final <R> void createQuery(TsurugiSqlQuery<R> ps)
```
Description copied from interface: TsurugiSessionEventListener

called when create query.

Specified by:

createQuery in interface TsurugiSessionEventListener

Type Parameters:

R - result type

Parameters:

ps - query

createQuery
```
public final <P,R> void createQuery(TsurugiSqlPreparedQuery<P,R> ps)
```
Description copied from interface: TsurugiSessionEventListener

called when create prepared query.

Specified by:

createQuery in interface TsurugiSessionEventListener

Type Parameters:

P - parameter type

R - result type

Parameters:

ps - query

createStatement
```
public final void createStatement(TsurugiSqlStatement ps)
```
Description copied from interface: TsurugiSessionEventListener

called when create statement.

Specified by:

createStatement in interface TsurugiSessionEventListener

Parameters:

ps - statement

createStatement
```
public final <P> void createStatement(TsurugiSqlPreparedStatement<P> ps)
```
Description copied from interface: TsurugiSessionEventListener

called when create prepared statement.

Specified by:

createStatement in interface TsurugiSessionEventListener

Type Parameters:

P - parameter type

Parameters:

ps - statement

createTransactionManager
```
public final void createTransactionManager(TsurugiTransactionManager tm)
```
Description copied from interface: TsurugiSessionEventListener

called when create transaction manager.

Specified by:

createTransactionManager in interface TsurugiSessionEventListener

Parameters:

tm - transaction manager

createTransaction
```
public final void createTransaction(TsurugiTransaction transaction)
```
Description copied from interface: TsurugiSessionEventListener

called when create transaction.

Specified by:

createTransaction in interface TsurugiSessionEventListener

Parameters:

transaction - transaction

shutdownSession

public final void shutdownSession(TsurugiSession session,
                                  TgSessionShutdownType shutdownType,
                                  long timeoutNanos,
                                  @Nullable
                                  java.lang.Throwable occurred)

Description copied from interface: TsurugiSessionEventListener

called when shutdown session.

Specified by:: shutdownSession in interface TsurugiSessionEventListener
Parameters:: session - session; shutdownType - shutdown type; timeoutNanos - shutdown timeout; occurred - exception

closeSession
```
public final void closeSession(TsurugiSession session,
                               long timeoutNanos,
                               @Nullable
                               java.lang.Throwable occurred)
```
Description copied from interface: TsurugiSessionEventListener

called when close session.

Specified by:

closeSession in interface TsurugiSessionEventListener

Parameters:

session - session

timeoutNanos - close timeout

occurred - exception

logCreateSqlStatement
```
protected void logCreateSqlStatement(TsurugiSql ps)
```
called when create SQL definition.

Parameters:

ps - SQL definition

logSessionShutdown

protected void logSessionShutdown(TsurugiSession session,
                                  TgSessionShutdownType shutdownType,
                                  @Nullable
                                  java.lang.Throwable occurred)

called when shutdown session.

Parameters:: session - session; shutdownType - shutdown type; occurred - exception
Since:: 1.4.0

logSessionClose

protected void logSessionClose(TsurugiSession session,
                               @Nullable
                               java.lang.Throwable occurred)

called when close session.

Parameters:: session - session; occurred - exception

doLogTmExecuteStart
```
protected void doLogTmExecuteStart(int iceaxeTmExecuteId)
```
do transactionManager execute start.

Parameters:

iceaxeTmExecuteId - iceaxe tm executeId

createTmLog
```
protected TgSessionTmLog createTmLog()
```
Creates a new transaction manager execute log.

Returns:

transaction manager execute log

getTmLog
```
protected TgSessionTmLog getTmLog(int iceaxeTmExecuteId)
```
get transaction manager execute log.

Parameters:

iceaxeTmExecuteId - iceaxe tm executeId

Returns:

transaction manager execute log

logTmExecuteStart
```
protected void logTmExecuteStart(TgSessionTmLog tmLog)
```
called when transactionManager execute start.

Parameters:

tmLog - transaction manager log

doLogTmExecuteException

protected void doLogTmExecuteException(TsurugiTransaction transaction,
                                       java.lang.Throwable occurred)

do transactionManager execute error.

Parameters:: transaction - transaction; occurred - exception

logTmExecuteException

protected void logTmExecuteException(TgSessionTxLog txLog,
                                     java.lang.Throwable occurred)

called when occurs transactionManager execute error.

Parameters:: txLog - transaction log; occurred - exception

doLogTmExecuteRetry

protected void doLogTmExecuteRetry(TsurugiTransaction transaction,
                                   java.lang.Exception cause,
                                   TgTmTxOption nextTmOption)

do transactionManager execute retry.

Parameters:: transaction - transaction; cause - retry exception; nextTmOption - next transaction option

logTmExecuteRetry

protected void logTmExecuteRetry(TgSessionTxLog txLog,
                                 java.lang.Exception cause,
                                 TgTmTxOption nextTmOption)

called when transactionManager execute retry.

Parameters:: txLog - transaction log; cause - retry exception; nextTmOption - next transaction option

doLogTmExecuteEnd

protected void doLogTmExecuteEnd(int iceaxeTmExecuteId,
                                 @Nullable
                                 TsurugiTransaction transaction,
                                 boolean committed,
                                 @Nullable
                                 java.lang.Object returnValue,
                                 @Nullable
                                 java.lang.Throwable occurred)

do transactionManager execute end.

Parameters:: iceaxeTmExecuteId - iceaxe tm executeId; transaction - transaction; committed - true if committed; returnValue - return value; occurred - exception

logTmExecuteEnd

protected void logTmExecuteEnd(TgSessionTmLog tmLog,
                               @Nullable
                               java.lang.Throwable occurred)

called when transactionManager execute end.

Parameters:: tmLog - transaction manager log; occurred - exception

doLogTransactionStart

protected void doLogTransactionStart(TsurugiTransaction transaction,
                                     java.time.ZonedDateTime startTime)

do transaction start.

Parameters:: transaction - transaction; startTime - start time

createTxLog
```
protected TgSessionTxLog createTxLog()
```
Creates a new transaction log instance.

Returns:

transaction log

getTxLog
```
protected TgSessionTxLog getTxLog(TsurugiTransaction transaction)
```
get transaction log.

Parameters:

transaction - transaction

Returns:

transaction log

logTransactionStart
```
protected void logTransactionStart(TgSessionTxLog txLog)
```
called when transaction start.

Parameters:

txLog - transaction log

doLowTransactionGetStart
```
protected void doLowTransactionGetStart(TsurugiTransaction transaction)
```
do get transactionId.

Parameters:

transaction - transaction

logLowTransactionGetStart
```
protected void logLowTransactionGetStart(TgSessionTxLog txLog)
```
called when get transactionId.

Parameters:

txLog - transaction log

doLowTransactionGetEnd

protected void doLowTransactionGetEnd(TsurugiTransaction transaction,
                                      java.lang.String transactionId,
                                      java.lang.Throwable occurred)

do get transactionId.

Parameters:: transaction - transaction; transactionId - transaction id; occurred - exception

logLowTransactionGetEnd

protected void logLowTransactionGetEnd(TgSessionTxLog txLog,
                                       @Nullable
                                       java.lang.String transactionId,
                                       @Nullable
                                       java.lang.Throwable occurred)

called when get transactionId.

Parameters:: txLog - transaction log; transactionId - transactionId; occurred - exception

doLogTransactionSqlStart

protected void doLogTransactionSqlStart(TsurugiTransaction transaction,
                                        TsurugiTransaction.TgTxMethod method,
                                        int iceaxeTxExecuteId,
                                        TsurugiSql ps,
                                        java.lang.Object parameter)

do execute SQL start.

Parameters:: transaction - transaction; method - execute method; iceaxeTxExecuteId - iceaxe tm executeId; ps - SQL definition; parameter - SQL parameter

logTransactionSqlStart

protected void logTransactionSqlStart(TsurugiTransaction.TgTxMethod method,
                                      TgSessionTxLog txLog,
                                      TgSessionTxLog.TgSessionTxExecuteLog exLog,
                                      TsurugiSql ps,
                                      java.lang.Object parameter)

called when execute SQL start.

Parameters:: method - execute method; txLog - transaction log; exLog - transaction SQL execute log; ps - SQL definition; parameter - SQL parameter

doLogTransactionSqlEnd

protected void doLogTransactionSqlEnd(TsurugiTransaction transaction,
                                      TsurugiTransaction.TgTxMethod method,
                                      int iceaxeTxExecuteId,
                                      TsurugiSql ps,
                                      java.lang.Object parameter,
                                      @Nullable
                                      TsurugiSqlResult result,
                                      @Nullable
                                      java.lang.Throwable occurred)

do execute SQL end.

Parameters:: transaction - transaction; method - execute method; iceaxeTxExecuteId - iceaxe tm executeId; ps - SQL definition; parameter - SQL parameter; result - SQL result; occurred - exception

logTransactionSqlEnd

protected void logTransactionSqlEnd(TsurugiTransaction.TgTxMethod method,
                                    TgSessionTxLog txLog,
                                    TgSessionTxLog.TgSessionTxExecuteLog exLog,
                                    TsurugiSql ps,
                                    java.lang.Object parameter,
                                    @Nullable
                                    TsurugiSqlResult result,
                                    @Nullable
                                    java.lang.Throwable occurred)

called when execute SQL end.

Parameters:: method - execute method; txLog - transaction log; exLog - transaction SQL execute log; ps - SQL definition; parameter - SQL parameter; result - SQL result; occurred - exception

doLogTransactionCommitStart

protected void doLogTransactionCommitStart(TsurugiTransaction transaction,
                                           TgCommitType commitType)

do commit start.

Parameters:: transaction - transaction; commitType - commit type

logTransactionCommitStart

protected void logTransactionCommitStart(TgSessionTxLog txLog,
                                         TgCommitType commitType)

called when commit start.

Parameters:: txLog - transaction log; commitType - commit type

doLogTransactionCommitEnd

protected void doLogTransactionCommitEnd(TsurugiTransaction transaction,
                                         TgCommitType commitType,
                                         @Nullable
                                         java.lang.Throwable occurred)

do commit end.

Parameters:: transaction - transaction; commitType - commit type; occurred - exception

logTransactionCommitEnd

protected void logTransactionCommitEnd(TgSessionTxLog txLog,
                                       TgCommitType commitType,
                                       @Nullable
                                       java.lang.Throwable occurred)

called when commit end.

Parameters:: txLog - transaction log; commitType - commit type; occurred - exception

doLogTransactionRollbackStart

protected void doLogTransactionRollbackStart(TsurugiTransaction transaction)

do rollback start.

Parameters:: transaction - transaction

logTransactionRollbackStart
```
protected void logTransactionRollbackStart(TgSessionTxLog txLog)
```
called when rollback start.

Parameters:

txLog - transaction log

doLogTransactionRollbackEnd

protected void doLogTransactionRollbackEnd(TsurugiTransaction transaction,
                                           @Nullable
                                           java.lang.Throwable occurred)

do rollback end.

Parameters:: transaction - transaction; occurred - exception

logTransactionRollbackEnd

protected void logTransactionRollbackEnd(TgSessionTxLog txLog,
                                         @Nullable
                                         java.lang.Throwable occurred)

called when rollback end.

Parameters:: txLog - transaction log; occurred - exception

doLogTransactionClose

protected void doLogTransactionClose(TsurugiTransaction transaction,
                                     @Nullable
                                     java.lang.Throwable occurred)

do transaction close.

Parameters:: transaction - transaction; occurred - exception

logTransactionClose

protected void logTransactionClose(TgSessionTxLog txLog,
                                   @Nullable
                                   java.lang.Throwable occurred)

called when transaction close.

Parameters:: txLog - transaction log; occurred - exception

doLogSqlStart

protected void doLogSqlStart(TsurugiTransaction transaction,
                             int iceaxeSqlExecuteId,
                             TsurugiSql ps,
                             java.lang.Object parameter)

do SQL start.

Parameters:: transaction - transaction; iceaxeSqlExecuteId - iceaxe SQL executeId; ps - SQL definition; parameter - SQL parameter

logSqlStart

protected void logSqlStart(TgSessionTxLog txLog,
                           TgSessionSqlLog sqlLog)

called when SQL execute start.

Parameters:: txLog - transaction log; sqlLog - SQL log

doLogSqlStartException

protected void doLogSqlStartException(TsurugiTransaction transaction,
                                      int iceaxeSqlExecuteId,
                                      java.lang.Throwable occurred)

do SQL execute start error.

Parameters:: transaction - transaction; iceaxeSqlExecuteId - iceaxe SQL executeId; occurred - exception

logSqlStartException

protected void logSqlStartException(TgSessionTxLog txLog,
                                    TgSessionSqlLog sqlLog,
                                    java.lang.Throwable occurred)

called when occurs exception SQL execute start.

Parameters:: txLog - transaction log; sqlLog - SQL log; occurred - exception

doLogSqlStarted

protected void doLogSqlStarted(TsurugiTransaction transaction,
                               TsurugiSqlResult result)

do SQL execute started.

Parameters:: transaction - transaction; result - SQL result

logSqlStarted

protected void logSqlStarted(TgSessionTxLog txLog,
                             TgSessionSqlLog sqlLog)

called when SQL execute started.

Parameters:: txLog - transaction log; sqlLog - SQL log

doLogSqlRead

protected <R> void doLogSqlRead(TsurugiTransaction transaction,
                                TsurugiQueryResult<R> result,
                                R record)

do SQL read.

Type Parameters:: R - record type
Parameters:: transaction - transaction; result - SQL result; record - record

logSqlRead

protected <R> void logSqlRead(TgSessionTxLog txLog,
                              TgSessionSqlLog sqlLog,
                              TsurugiQueryResult<R> result,
                              R record)

called when SQL read.

Type Parameters:: R - result type
Parameters:: txLog - transaction log; sqlLog - SQL log; result - SQL result; record - record

doLogSqlReadException

protected <R> void doLogSqlReadException(TsurugiTransaction transaction,
                                         TsurugiQueryResult<R> result,
                                         java.lang.Throwable occurred)

do SQL read error.

Type Parameters:: R - record type
Parameters:: transaction - transaction; result - SQL result; occurred - exception

logSqlReadException

protected <R> void logSqlReadException(TgSessionTxLog txLog,
                                       TgSessionSqlLog sqlLog,
                                       TsurugiQueryResult<R> result,
                                       java.lang.Throwable occurred)

called when occurs exception SQL read.

Type Parameters:: R - record type
Parameters:: txLog - transaction log; sqlLog - SQL log; result - SQL result; occurred - exception

doLogSqlEnd

protected void doLogSqlEnd(TsurugiTransaction transaction,
                           TsurugiSqlResult result,
                           @Nullable
                           java.lang.Throwable occurred)

do SQL execute end.

Parameters:: transaction - transaction; result - SQL result; occurred - exception

logSqlEnd

protected void logSqlEnd(TgSessionTxLog txLog,
                         TgSessionSqlLog sqlLog,
                         @Nullable
                         java.lang.Throwable occurred)

called when SQL execute end.

Parameters:: txLog - transaction log; sqlLog - SQL log; occurred - exception

doLogSqlClose

protected void doLogSqlClose(TsurugiTransaction transaction,
                             TsurugiSqlResult result,
                             @Nullable
                             java.lang.Throwable occurred)

do SQL result close.

Parameters:: transaction - transaction; result - SQL result; occurred - exception

logSqlClose

protected void logSqlClose(TgSessionTxLog txLog,
                           TgSessionSqlLog sqlLog,
                           @Nullable
                           java.lang.Throwable occurred)

called when SQL result close.

Parameters:: txLog - transaction log; sqlLog - SQL log; occurred - exception

Class TsurugiSessionTxLogger

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

TsurugiSessionTxLogger