Logger (Neo4j Java Driver 4.0.0-rc1 API)

```
public interface Logger
```
Logs messages for driver activity.
Some methods in this interface take a message template together with a list of parameters. These methods are expected to construct the final message only if the needed logging level is enabled. Driver expects formatting to be done using String.format(String, Object...) method. Thus all supplied message templates will contain "%s" as parameter placeholders. This is different from all SLF4J-compatible logging frameworks where parameter placeholder is "{}". Implementations of this interface should adapt placeholders from "%s" to "{}", if required.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`debug(String message, Object... params)` Logs bolt messages sent and received by this driver.
`void`	`error(String message, Throwable cause)` Logs errors from this driver.
`void`	`info(String message, Object... params)` Logs information from the driver.
`boolean`	`isDebugEnabled()` Return true if the debug level is enabled.
`boolean`	`isTraceEnabled()` Return true if the trace logging level is enabled.
`void`	`trace(String message, Object... params)` Logs binary sent and received by this driver.
`void`	`warn(String message, Object... params)` Logs warnings that happened when using the driver.
`void`	`warn(String message, Throwable cause)` Logs warnings that happened during using the driver

- Method Detail
  - error
```
void error(String message,
           Throwable cause)
```
    Logs errors from this driver.
    Examples of errors logged using this method:
    - Network connection errors
    - DNS resolution errors
    - Cluster discovery errors
    Parameters:
    
    message - the error message.
    
    cause - the cause of the error.
  - info
```
void info(String message,
          Object... params)
```
    Logs information from the driver.
    Example of info messages logged using this method:
    - Driver creation and shutdown
    - Cluster discovery progress
    Parameters:
    
    message - the information message template. Can contain String.format(String, Object...)-style placeholders, like "%s".
    
    params - parameters used in the information message.
  - warn
```
void warn(String message,
          Object... params)
```
    Logs warnings that happened when using the driver.
    Example of info messages logged using this method:
    - Usage of deprecated APIs
    - Transaction retry failures
    Parameters:
    
    message - the warning message template. Can contain String.format(String, Object...)-style placeholders, like "%s".
    
    params - parameters used in the warning message.
  - warn
```
void warn(String message,
          Throwable cause)
```
    Logs warnings that happened during using the driver
    Example of info messages logged using this method:
    - Usage of deprecated APIs
    - Transaction retry failures
    Parameters:
    
    message - the warning message
    
    cause - the cause of the warning
  - debug
```
void debug(String message,
           Object... params)
```
    Logs bolt messages sent and received by this driver. It is only enabled when isDebugEnabled() returns true. This logging level generates a lot of log entries.
    Example of debug messages logged using this method:
    - Connection pool events, like creation, acquire and release of connections
    - Messages sent to the database
    - Messages received from the database
    Parameters:
    
    message - the debug message template. Can contain String.format(String, Object...)-style placeholders, like "%s".
    
    params - parameters used in generating the bolt message
  - trace
```
void trace(String message,
           Object... params)
```
    Logs binary sent and received by this driver. It is only enabled when isTraceEnabled() returns true. This logging level generates huge amount of log entries.
    Example of debug messages logged using this method:
    - Idle connection pings
    - Server selection for load balancing
    - Messages sent to the database with bytes in hex
    - Messages received from the database with bytes in hex
    Parameters:
    
    message - the trace message template. Can contain String.format(String, Object...)-style placeholders, like "%s".
    
    params - parameters used in generating the hex message
  - isTraceEnabled
```
boolean isTraceEnabled()
```
    Return true if the trace logging level is enabled.
    
    Returns:
    
    true if the trace logging level is enabled.
    
    See Also:
    
    trace(String, Object...)
  - isDebugEnabled
```
boolean isDebugEnabled()
```
    Return true if the debug level is enabled.
    
    Returns:
    
    true if the debug level is enabled.
    
    See Also:
    
    debug(String, Object...)

Interface Logger

Method Summary

Method Detail

error

info

warn

warn

debug

trace

isTraceEnabled

isDebugEnabled