Class LoggingHandler (3.5.3)

Version 3.5.3

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public class LoggingHandler extends Handler

A logging handler that outputs logs generated with java.util.logging.Logger to Cloud Logging.

Java logging levels (see java.util.logging.Level) are mapped to the following Google Cloud Logging severities:

Java Level	Cloud Logging Severity
SEVERE	ERROR
WARNING	WARNING
INFO	INFO
CONFIG	INFO
FINE	DEBUG
FINER	DEBUG
FINEST	DEBUG

Original Java logging levels are added as labels (with levelName and levelValue keys, respectively) to the corresponding Cloud Logging LogEntry. You can read entry labels using LogEntry#getLabels(). To use logging levels that correspond to Cloud Logging severities you can use LoggingLevel.

Configuration: By default each LoggingHandler is initialized using the following LogManager configuration properties (that you can set in the logging.properties file). If properties are not defined (or have invalid values) then the specified default values are used.

• com.google.cloud.logging.LoggingHandler.log the log name (defaults to java.log).
• com.google.cloud.logging.LoggingHandler.level specifies the default level for the handler (defaults to Level.INFO).
• com.google.cloud.logging.LoggingHandler.filter specifies the name of a Filter class to use (defaults to no filter).
• com.google.cloud.logging.LoggingHandler.formatter specifies the name of a Formatter class to use (defaults to SimpleFormatter).
• com.google.cloud.logging.LoggingHandler.flushLevel specifies the flush log level. When a log with this level is published, logs are transmitted to the Cloud Logging service (defaults to LoggingLevel#ERROR).
• com.google.cloud.logging.LoggingHandler.enhancers specifies a comma separated list of LoggingEnhancer classes. This handler will call each enhancer list whenever it builds a LogEntry instance (defaults to empty list).
• com.google.cloud.logging.LoggingHandler.resourceType the type name to use when creating the default MonitoredResource (defaults to auto-detected resource type, else "global").
• com.google.cloud.logging.Synchronicity the synchronicity of the write method to use to write logs to the Cloud Logging service (defaults to Synchronicity#ASYNC).

To add a LoggingHandler to an existing Logger and be sure to avoid infinite recursion when logging, use the #addHandler(Logger, LoggingHandler) method. Alternatively you can add the handler via logging.properties. For example using the following line:

 com.example.mypackage.handlers=com.google.cloud.logging.LoggingHandler
 

Inheritance

java.lang.Object > Handler > LoggingHandler

Inherited Members

Object.clone()

Object.equals(Object)

Object.finalize()

Object.getClass()

Object.hashCode()

Object.notify()

Object.notifyAll()

Object.toString()

Object.wait()

Object.wait(long)

Object.wait(long,int)

Handler.close()

Handler.flush()

Handler.getEncoding()

Handler.getErrorManager()

Handler.getFilter()

Handler.getFormatter()

Handler.getLevel()

Handler.isLoggable(LogRecord)

Handler.publish(LogRecord)

Handler.reportError(String,Exception,int)

Handler.setEncoding(String)

Handler.setErrorManager(ErrorManager)

Handler.setFilter(Filter)

Handler.setFormatter(Formatter)

Handler.setLevel(Level)

Constructors

LoggingHandler()

public LoggingHandler()

Creates an handler that publishes messages to Cloud Logging.

LoggingHandler(String log)

public LoggingHandler(String log)

Creates a handler that publishes messages to Cloud Logging.

Parameter

Name	Description
log	String the name of the log to which log entries are written

LoggingHandler(String log, LoggingOptions options)

public LoggingHandler(String log, LoggingOptions options)

Creates a handler that publishes messages to Cloud Logging.

Parameters

Name	Description
log	String the name of the log to which log entries are written
options	LoggingOptions options for the Cloud Logging service

LoggingHandler(String log, LoggingOptions options, MonitoredResource monitoredResource)

public LoggingHandler(String log, LoggingOptions options, MonitoredResource monitoredResource)

Creates a handler that publishes messages to Cloud Logging.

Parameters

Name	Description
log	String the name of the log to which log entries are written
options	LoggingOptions options for the Cloud Logging service
monitoredResource	com.google.cloud.MonitoredResource the monitored resource to which log entries refer. If it is null then a default resource is created based on the project ID and deployment environment.

LoggingHandler(String log, LoggingOptions options, MonitoredResource monitoredResource, List<LoggingEnhancer> enhancers)

public LoggingHandler(String log, LoggingOptions options, MonitoredResource monitoredResource, List<LoggingEnhancer> enhancers)

Creates a handler that publishes messages to Cloud Logging.

Parameters

Name	Description
log	String the name of the log to which log entries are written
options	LoggingOptions options for the Cloud Logging service
monitoredResource	com.google.cloud.MonitoredResource the monitored resource to which log entries refer. If it is null then a default resource is created based on the project ID and deployment environment.
enhancers	List<LoggingEnhancer> List of LoggingEnhancer instances used to enhance anyLogEntry instances built by this handler.

LoggingHandler(String log, LoggingOptions options, MonitoredResource monitoredResource, List<LoggingEnhancer> enhancers, LogDestinationName destination)

public LoggingHandler(String log, LoggingOptions options, MonitoredResource monitoredResource, List<LoggingEnhancer> enhancers, LogDestinationName destination)

Creates a handler that publishes messages to Cloud Logging.

Parameters

Name	Description
log	String the name of the log to which log entries are written
options	LoggingOptions options for the Cloud Logging service
monitoredResource	com.google.cloud.MonitoredResource the monitored resource to which log entries refer. If it is null then a default resource is created based on the project ID and deployment environment.
enhancers	List<LoggingEnhancer> List of LoggingEnhancer instances used to enhance anyLogEntry instances built by this handler.
destination	LogDestinationName the log destination LogDestinationName (see 'logName' parameter in https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry)

Methods

addHandler(Logger logger, LoggingHandler handler)

public static void addHandler(Logger logger, LoggingHandler handler)

Adds the provided LoggingHandler to logger. Use this method to register Cloud Logging handlers instead of Logger#addHandler(Handler) to avoid infinite recursion when logging.

Parameters

Name	Description
logger	Logger
handler	LoggingHandler

close()

public synchronized void close()

Closes the handler and the associated Logging object.

Overrides

Handler.close()

Exceptions

Type	Description
SecurityException

flush()

public void flush()

Overrides

Handler.flush()

getFlushLevel()

public Level getFlushLevel()

Get the flush log level.

Returns

Type	Description
Level

getSynchronicity()

public Synchronicity getSynchronicity()

Get the flush log level.

Returns

Type	Description
Synchronicity

publish(LogRecord record)

public void publish(LogRecord record)

Parameter

Name	Description
record	LogRecord

Overrides

Handler.publish(LogRecord)

setFlushLevel(Level flushLevel)

public void setFlushLevel(Level flushLevel)

Sets minimum logging level to log immediately and flush any pending writes.

Parameter

Name	Description
flushLevel	Level minimum log level to trigger flush

setSynchronicity(Synchronicity synchronicity)

public void setSynchronicity(Synchronicity synchronicity)

Sets synchronicity of logging writes. By default, writes are asynchronous.

Parameter

Name	Description
synchronicity	Synchronicity Synchronicity