net.logstash.logback.appender

Class AsyncDisruptorAppender<Event extends ch.qos.logback.core.spi.DeferredProcessingAware,Listener extends AppenderListener<Event>>

java.lang.Object

ch.qos.logback.core.spi.ContextAwareBase

ch.qos.logback.core.UnsynchronizedAppenderBase<Event>

net.logstash.logback.appender.AsyncDisruptorAppender<Event,Listener>

Type Parameters:

Event - type of event (ILoggingEvent or IAccessEvent).

All Implemented Interfaces:

ch.qos.logback.core.Appender<Event>, ch.qos.logback.core.spi.ContextAware, ch.qos.logback.core.spi.FilterAttachable<Event>, ch.qos.logback.core.spi.LifeCycle

Direct Known Subclasses:

AbstractLogstashTcpSocketAppender, DelegatingAsyncDisruptorAppender

public abstract class AsyncDisruptorAppender<Event extends ch.qos.logback.core.spi.DeferredProcessingAware,Listener extends AppenderListener<Event>>
extends ch.qos.logback.core.UnsynchronizedAppenderBase<Event>

An asynchronous appender that uses an LMAX Disruptor RingBuffer as the interthread data exchange mechanism (as opposed to a BlockingQueue used by logback's AsyncAppender).

See the LMAX Disruptor documentation for more information about the advantages of using a RingBuffer over a BlockingQueue.

This appender will never block the logging thread, since it uses RingBuffer.tryPublishEvent(EventTranslatorOneArg, Object) to publish events (rather than RingBuffer.publishEvent(EventTranslatorOneArg, Object)).

If the RingBuffer is full, and the event cannot be published, the event will be dropped. A warning message will be logged to logback's context every droppedWarnFrequency consecutive dropped events.

A single handler thread will be used to handle the actual handling of the event.

Subclasses are required to set the eventHandler to define the logic that executes in the handler thread. For example, DelegatingAsyncDisruptorAppender for will delegate appending of the event to another appender in the handler thread.

By default, child threads created by this appender will be daemon threads, and therefore allow the JVM to exit gracefully without needing to explicitly shut down the appender. Note that in this case, it is possible for appended log events to not be handled (if the child thread has not had a chance to process them yet). By setting setDaemon(boolean) to false, you can change this behavior. When false, child threads created by this appender will not be daemon threads, and therefore will prevent the JVM from shutting down until the appender is explicitly shut down. Set this to false if you want to ensure that every log event prior to shutdown is handled.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	AsyncDisruptorAppender.LogEvent<Event> Event wrapper object used for each element of the RingBuffer.
protected static class	AsyncDisruptorAppender.LogEventTranslator<Event> Sets the AsyncDisruptorAppender.LogEvent.event to the logback Event.

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	APPENDER_NAME_FORMAT
static int	DEFAULT_DROPPED_WARN_FREQUENCY
static com.lmax.disruptor.dsl.ProducerType	DEFAULT_PRODUCER_TYPE
static int	DEFAULT_RING_BUFFER_SIZE
static String	DEFAULT_THREAD_NAME_FORMAT
static com.lmax.disruptor.WaitStrategy	DEFAULT_WAIT_STRATEGY
protected List<Listener>	listeners These listeners will be notified when certain events occur on this appender.
protected static String	THREAD_INDEX_FORMAT

Fields inherited from class ch.qos.logback.core.UnsynchronizedAppenderBase

name, started

Fields inherited from class ch.qos.logback.core.spi.ContextAwareBase

context

Constructor Summary

Constructors

Constructor and Description
AsyncDisruptorAppender()

Method Summary

Modifier and Type	Method and Description
void	addListener(Listener listener)
protected void	append(Event event)
protected String	calculateThreadName()
protected void	fireAppenderStarted()
protected void	fireAppenderStopped()
protected void	fireEventAppended(Event event, long durationInNanos)
protected void	fireEventAppendFailed(Event event, Throwable reason)
protected com.lmax.disruptor.dsl.Disruptor<AsyncDisruptorAppender.LogEvent<Event>>	getDisruptor()
int	getDroppedWarnFrequency()
protected com.lmax.disruptor.EventHandler<AsyncDisruptorAppender.LogEvent<Event>>	getEventHandler()
protected com.lmax.disruptor.EventTranslatorOneArg<AsyncDisruptorAppender.LogEvent<Event>,Event>	getEventTranslator()
protected ScheduledExecutorService	getExecutorService()
com.lmax.disruptor.dsl.ProducerType	getProducerType()
int	getRingBufferSize()
ThreadFactory	getThreadFactory()
String	getThreadNameFormat()
protected List<Object>	getThreadNameFormatParams()
String	getThreadNamePrefix() Deprecated. use getThreadNameFormat()
protected int	getThreadPoolCoreSize()
com.lmax.disruptor.WaitStrategy	getWaitStrategy()
boolean	isDaemon()
protected void	prepareForDeferredProcessing(Event event)
void	removeListener(Listener listener)
void	setDaemon(boolean useDaemonThread)
void	setDroppedWarnFrequency(int droppedWarnFrequency)
protected void	setEventFactory(net.logstash.logback.appender.AsyncDisruptorAppender.LogEventFactory<Event> eventFactory)
protected void	setEventHandler(com.lmax.disruptor.EventHandler<AsyncDisruptorAppender.LogEvent<Event>> eventHandler)
protected void	setEventTranslator(com.lmax.disruptor.EventTranslatorOneArg<AsyncDisruptorAppender.LogEvent<Event>,Event> eventTranslator)
void	setProducerType(com.lmax.disruptor.dsl.ProducerType producerType)
void	setRingBufferSize(int ringBufferSize)
void	setThreadFactory(ThreadFactory threadFactory)
void	setThreadNameFormat(String threadNameFormat) Pattern used by the to set the handler thread names.
void	setThreadNamePrefix(String threadNamePrefix) Deprecated. use setThreadNameFormat(String) instead.
protected void	setThreadPoolCoreSize(int threadPoolCoreSize)
void	setWaitStrategy(com.lmax.disruptor.WaitStrategy waitStrategy)
void	setWaitStrategyType(String waitStrategyType)
void	start()
void	stop()

Methods inherited from class ch.qos.logback.core.UnsynchronizedAppenderBase

addFilter, clearAllFilters, doAppend, getCopyOfAttachedFiltersList, getFilterChainDecision, getName, isStarted, setName, toString

Methods inherited from class ch.qos.logback.core.spi.ContextAwareBase

addError, addError, addInfo, addInfo, addStatus, addWarn, addWarn, getContext, getDeclaredOrigin, getStatusManager, setContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface ch.qos.logback.core.spi.ContextAware

addError, addError, addInfo, addInfo, addStatus, addWarn, addWarn, getContext, setContext

Field Detail

APPENDER_NAME_FORMAT

protected static final String APPENDER_NAME_FORMAT

See Also:

Constant Field Values

THREAD_INDEX_FORMAT

protected static final String THREAD_INDEX_FORMAT

See Also:

Constant Field Values

DEFAULT_THREAD_NAME_FORMAT

public static final String DEFAULT_THREAD_NAME_FORMAT

See Also:

Constant Field Values

DEFAULT_RING_BUFFER_SIZE

public static final int DEFAULT_RING_BUFFER_SIZE

See Also:

Constant Field Values

DEFAULT_PRODUCER_TYPE

public static final com.lmax.disruptor.dsl.ProducerType DEFAULT_PRODUCER_TYPE

DEFAULT_WAIT_STRATEGY

public static final com.lmax.disruptor.WaitStrategy DEFAULT_WAIT_STRATEGY

DEFAULT_DROPPED_WARN_FREQUENCY

public static final int DEFAULT_DROPPED_WARN_FREQUENCY

See Also:

Constant Field Values

listeners

protected final List<Listener extends AppenderListener<Event>> listeners

These listeners will be notified when certain events occur on this appender.

Constructor Detail

AsyncDisruptorAppender

public AsyncDisruptorAppender()

Method Detail

start

public void start()

Specified by:

start in interface ch.qos.logback.core.spi.LifeCycle

Overrides:

start in class ch.qos.logback.core.UnsynchronizedAppenderBase<Event extends ch.qos.logback.core.spi.DeferredProcessingAware>

stop

public void stop()

Specified by:

stop in interface ch.qos.logback.core.spi.LifeCycle

Overrides:

stop in class ch.qos.logback.core.UnsynchronizedAppenderBase<Event extends ch.qos.logback.core.spi.DeferredProcessingAware>

append

protected void append(Event event)

Specified by:

append in class ch.qos.logback.core.UnsynchronizedAppenderBase<Event extends ch.qos.logback.core.spi.DeferredProcessingAware>

prepareForDeferredProcessing

protected void prepareForDeferredProcessing(Event event)

calculateThreadName

protected String calculateThreadName()

getThreadNameFormatParams

protected List<Object> getThreadNameFormatParams()

fireAppenderStarted

protected void fireAppenderStarted()

fireAppenderStopped

protected void fireAppenderStopped()

fireEventAppended

protected void fireEventAppended(Event event,
                                 long durationInNanos)

fireEventAppendFailed

protected void fireEventAppendFailed(Event event,
                                     Throwable reason)

setEventFactory

protected void setEventFactory(net.logstash.logback.appender.AsyncDisruptorAppender.LogEventFactory<Event> eventFactory)

getEventTranslator

protected com.lmax.disruptor.EventTranslatorOneArg<AsyncDisruptorAppender.LogEvent<Event>,Event> getEventTranslator()

setEventTranslator

protected void setEventTranslator(com.lmax.disruptor.EventTranslatorOneArg<AsyncDisruptorAppender.LogEvent<Event>,Event> eventTranslator)

getExecutorService

protected ScheduledExecutorService getExecutorService()

getDisruptor

protected com.lmax.disruptor.dsl.Disruptor<AsyncDisruptorAppender.LogEvent<Event>> getDisruptor()

getThreadPoolCoreSize

protected int getThreadPoolCoreSize()

setThreadPoolCoreSize

protected void setThreadPoolCoreSize(int threadPoolCoreSize)

getThreadNamePrefix

@Deprecated
public String getThreadNamePrefix()

Deprecated. use getThreadNameFormat()

setThreadNamePrefix

@Deprecated
public void setThreadNamePrefix(String threadNamePrefix)

Deprecated. use setThreadNameFormat(String) instead.

This is the old way to customize thread names.

Parameters:

threadNamePrefix -

getThreadNameFormat

public String getThreadNameFormat()

setThreadNameFormat

public void setThreadNameFormat(String threadNameFormat)

Pattern used by the to set the handler thread names. Defaults to "logback-appender-%1$s-%2$d".

If you change the threadFactory, then this value may not be honored.

The string is a format pattern understood by Formatter.format(String, Object...). Formatter.format(String, Object...) is used to construct the actual thread name prefix. The first argument (%1$s) is the string appender name. The second argument (%2$d) is the numerical thread index. Other arguments can be made available by subclasses.

getRingBufferSize

public int getRingBufferSize()

setRingBufferSize

public void setRingBufferSize(int ringBufferSize)

getProducerType

public com.lmax.disruptor.dsl.ProducerType getProducerType()

setProducerType

public void setProducerType(com.lmax.disruptor.dsl.ProducerType producerType)

getWaitStrategy

public com.lmax.disruptor.WaitStrategy getWaitStrategy()

setWaitStrategy

public void setWaitStrategy(com.lmax.disruptor.WaitStrategy waitStrategy)

setWaitStrategyType

public void setWaitStrategyType(String waitStrategyType)

getThreadFactory

public ThreadFactory getThreadFactory()

setThreadFactory

public void setThreadFactory(ThreadFactory threadFactory)

getDroppedWarnFrequency

public int getDroppedWarnFrequency()

setDroppedWarnFrequency

public void setDroppedWarnFrequency(int droppedWarnFrequency)

getEventHandler

protected com.lmax.disruptor.EventHandler<AsyncDisruptorAppender.LogEvent<Event>> getEventHandler()

setEventHandler

protected void setEventHandler(com.lmax.disruptor.EventHandler<AsyncDisruptorAppender.LogEvent<Event>> eventHandler)

isDaemon

public boolean isDaemon()

setDaemon

public void setDaemon(boolean useDaemonThread)

addListener

public void addListener(Listener listener)

removeListener

public void removeListener(Listener listener)