org.osgi.service.log

Interface LogService

public interface LogService

Provides methods for bundles to write messages to the log.

LogService methods are provided to log messages; optionally with a ServiceReference object or an exception.

Bundles must log messages in the OSGi environment with a severity level according to the following hierarchy:

1. LOG_ERROR
2. LOG_WARNING
3. LOG_INFO
4. LOG_DEBUG

"ThreadSafe"

"Consumers of this API must not implement this interface"

Field Summary

Fields

Modifier and Type	Field and Description
static int	LOG_DEBUG A debugging message (Value 4).
static int	LOG_ERROR An error message (Value 1).
static int	LOG_INFO An informational message (Value 3).
static int	LOG_WARNING A warning message (Value 2).

Method Summary

Methods

Modifier and Type	Method and Description
void	log(int level, String message) Logs a message.
void	log(int level, String message, Throwable exception) Logs a message with an exception.
void	log(ServiceReference sr, int level, String message) Logs a message associated with a specific ServiceReference object.
void	log(ServiceReference sr, int level, String message, Throwable exception) Logs a message with an exception associated and a ServiceReference object.

Field Detail

LOG_ERROR

static final int LOG_ERROR

An error message (Value 1).

This log entry indicates the bundle or service may not be functional.

See Also:

Constant Field Values

LOG_WARNING

static final int LOG_WARNING

A warning message (Value 2).

This log entry indicates a bundle or service is still functioning but may experience problems in the future because of the warning condition.

See Also:

Constant Field Values

LOG_INFO

static final int LOG_INFO

An informational message (Value 3).

This log entry may be the result of any change in the bundle or service and does not indicate a problem.

See Also:

Constant Field Values

LOG_DEBUG

static final int LOG_DEBUG

A debugging message (Value 4).

This log entry is used for problem determination and may be irrelevant to anyone but the bundle developer.

See Also:

Constant Field Values

Method Detail

log

void log(int level,
       String message)

Logs a message.

The ServiceReference field and the Throwable field of the LogEntry object will be set to null.

Parameters:

level - The severity of the message. This should be one of the defined log levels but may be any integer that is interpreted in a user defined way.

message - Human readable string describing the condition or null.

See Also:

LOG_ERROR, LOG_WARNING, LOG_INFO, LOG_DEBUG

log

void log(int level,
       String message,
       Throwable exception)

Logs a message with an exception.

The ServiceReference field of the LogEntry object will be set to null.

Parameters:

level - The severity of the message. This should be one of the defined log levels but may be any integer that is interpreted in a user defined way.

message - The human readable string describing the condition or null.

exception - The exception that reflects the condition or null.

See Also:

LOG_ERROR, LOG_WARNING, LOG_INFO, LOG_DEBUG

log

void log(ServiceReference sr,
       int level,
       String message)

Logs a message associated with a specific ServiceReference object.

The Throwable field of the LogEntry will be set to null.

Parameters:

sr - The ServiceReference object of the service that this message is associated with or null.

level - The severity of the message. This should be one of the defined log levels but may be any integer that is interpreted in a user defined way.

message - Human readable string describing the condition or null.

See Also:

LOG_ERROR, LOG_WARNING, LOG_INFO, LOG_DEBUG

log

void log(ServiceReference sr,
       int level,
       String message,
       Throwable exception)

Logs a message with an exception associated and a ServiceReference object.

Parameters:

sr - The ServiceReference object of the service that this message is associated with.

level - The severity of the message. This should be one of the defined log levels but may be any integer that is interpreted in a user defined way.

message - Human readable string describing the condition or null.

exception - The exception that reflects the condition or null.

See Also:

LOG_ERROR, LOG_WARNING, LOG_INFO, LOG_DEBUG