org.apache.camel.impl.engine

Class DefaultShutdownStrategy

java.lang.Object

org.apache.camel.support.service.ServiceSupport

org.apache.camel.impl.engine.DefaultShutdownStrategy

All Implemented Interfaces:

AutoCloseable, org.apache.camel.CamelContextAware, org.apache.camel.Service, org.apache.camel.ShutdownableService, org.apache.camel.spi.ShutdownStrategy, org.apache.camel.StatefulService, org.apache.camel.StaticService, org.apache.camel.SuspendableService

public class DefaultShutdownStrategy
extends org.apache.camel.support.service.ServiceSupport
implements org.apache.camel.spi.ShutdownStrategy, org.apache.camel.CamelContextAware

Default ShutdownStrategy which uses graceful shutdown.

Graceful shutdown ensures that any inflight and pending messages will be taken into account and it will wait until these exchanges has been completed.

This strategy will perform graceful shutdown in two steps:

• Graceful - By suspending/stopping consumers, and let any in-flight exchanges complete
• Forced - After a given period of time, a timeout occurred and if there are still pending exchanges to complete, then a more aggressive forced strategy is performed.

The idea by the graceful shutdown strategy, is to stop taking in more new messages, and allow any existing inflight messages to complete. Then when there is no more inflight messages then the routes can be fully shutdown. This mean that if there is inflight messages then we will have to wait for these messages to complete. If they do not complete after a period of time, then a timeout triggers. And then a more aggressive strategy takes over.

The idea by the forced shutdown strategy, is to stop continue processing messages. And force routes and its services to shutdown now. There is a risk when shutting down now, that some resources is not properly shutdown, which can cause side effects. The timeout value is by default 300 seconds, but can be customized.

As this strategy will politely wait until all exchanges has been completed it can potential wait for a long time, and hence why a timeout value can be set. When the timeout triggers you can also specify whether the remainder consumers should be shutdown now or ignore.

Will by default use a timeout of 300 seconds (5 minutes) by which it will shutdown now the remaining consumers. This ensures that when shutting down Camel it at some point eventually will shutdown. This behavior can of course be configured using the setTimeout(long) and setShutdownNowOnTimeout(boolean) methods.

Routes will by default be shutdown in the reverse order of which they where started. You can customize this using the setShutdownRoutesInReverseOrder(boolean) method.

After route consumers have been shutdown, then any ShutdownPrepared services on the routes is being prepared for shutdown, by invoking ShutdownPrepared.prepareShutdown(boolean,boolean) which force=false.

Then if a timeout occurred and the strategy has been configured with shutdown-now on timeout, then the strategy performs a more aggressive forced shutdown, by forcing all consumers to shutdown and then invokes ShutdownPrepared.prepareShutdown(boolean,boolean) with force=true on the services. This allows the services to know they should force shutdown now.

When timeout occurred and a forced shutdown is happening, then there may be threads/tasks which are still inflight which may be rejected continued being routed. By default this can cause WARN and ERRORs to be logged. The option setSuppressLoggingOnTimeout(boolean) can be used to suppress these logs, so they are logged at TRACE level instead.

Also when a timeout occurred then information about the inflight exchanges is logged, if isLogInflightExchangesOnTimeout() is enabled (is by default). This allows end users to known where these inflight exchanges currently are in the route(s), and how long time they have been inflight.

This information can also be obtained from the InflightRepository at all time during runtime.

Field Summary

Fields inherited from class org.apache.camel.support.service.ServiceSupport

BUILDED, FAILED, INITIALIZED, lock, log, NEW, SHUTDOWN, SHUTTINGDOWN, STARTED, STARTING, status, STOPPED, STOPPING, SUSPENDED, SUSPENDING

Constructor Summary

Constructors

Constructor and Description
DefaultShutdownStrategy()
DefaultShutdownStrategy(org.apache.camel.CamelContext camelContext)

Method Summary

Modifier and Type	Method and Description
protected void	doShutdown()
protected boolean	doShutdown(org.apache.camel.CamelContext context, List<org.apache.camel.spi.RouteStartupOrder> routes, long timeout, TimeUnit timeUnit, boolean suspendOnly, boolean abortAfterTimeout, boolean forceShutdown)
protected void	doStart()
protected void	doStop()
boolean	forceShutdown(org.apache.camel.Service service)
org.apache.camel.CamelContext	getCamelContext()
Future<?>	getCurrentShutdownTaskFuture()
protected static int	getPendingInflightExchanges(org.apache.camel.spi.RouteStartupOrder order) Calculates the total number of inflight exchanges for the given route
long	getTimeout()
TimeUnit	getTimeUnit()
boolean	hasTimeoutOccurred()
boolean	isLogInflightExchangesOnTimeout()
boolean	isShutdownNowOnTimeout()
boolean	isShutdownRoutesInReverseOrder()
boolean	isSuppressLoggingOnTimeout()
protected void	logInflightExchanges(org.apache.camel.CamelContext camelContext, List<org.apache.camel.spi.RouteStartupOrder> routes, boolean infoLevel) Logs information about the inflight exchanges
void	setCamelContext(org.apache.camel.CamelContext camelContext)
void	setLogInflightExchangesOnTimeout(boolean logInflightExchangesOnTimeout)
void	setShutdownNowOnTimeout(boolean shutdownNowOnTimeout)
void	setShutdownRoutesInReverseOrder(boolean shutdownRoutesInReverseOrder)
void	setSuppressLoggingOnTimeout(boolean suppressLoggingOnTimeout)
void	setTimeout(long timeout)
void	setTimeUnit(TimeUnit timeUnit)
void	shutdown(org.apache.camel.CamelContext context, List<org.apache.camel.spi.RouteStartupOrder> routes)
void	shutdown(org.apache.camel.CamelContext context, List<org.apache.camel.spi.RouteStartupOrder> routes, long timeout, TimeUnit timeUnit)
boolean	shutdown(org.apache.camel.CamelContext context, org.apache.camel.spi.RouteStartupOrder route, long timeout, TimeUnit timeUnit, boolean abortAfterTimeout)
void	shutdownForced(org.apache.camel.CamelContext context, List<org.apache.camel.spi.RouteStartupOrder> routes)
protected void	shutdownNow(org.apache.camel.Consumer consumer) Shutdown the consumer immediately.
protected void	shutdownNow(List<org.apache.camel.Consumer> consumers) Shutdown all the consumers immediately.
protected void	shutdownRoutesNow(List<org.apache.camel.spi.RouteStartupOrder> routes) Shutdown all the consumers immediately.
void	suspend(org.apache.camel.CamelContext context, List<org.apache.camel.spi.RouteStartupOrder> routes)
void	suspend(org.apache.camel.CamelContext context, List<org.apache.camel.spi.RouteStartupOrder> routes, long timeout, TimeUnit timeUnit)
protected void	suspendNow(org.apache.camel.Consumer consumer) Suspends/stops the consumer immediately.

Methods inherited from class org.apache.camel.support.service.ServiceSupport

build, doBuild, doInit, doResume, doSuspend, getStatus, init, isBuild, isInit, isNew, isRunAllowed, isShutdown, isStarted, isStarting, isStartingOrStarted, isStopped, isStopping, isStoppingOrStopped, isSuspended, isSuspending, isSuspendingOrSuspended, resume, shutdown, start, stop, suspend

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.camel.Service

build, close, init, start, stop

Methods inherited from interface org.apache.camel.CamelContextAware

trySetCamelContext

Constructor Detail

DefaultShutdownStrategy

public DefaultShutdownStrategy()

DefaultShutdownStrategy

public DefaultShutdownStrategy(org.apache.camel.CamelContext camelContext)

Method Detail

shutdown

public void shutdown(org.apache.camel.CamelContext context,
                     List<org.apache.camel.spi.RouteStartupOrder> routes)
              throws Exception

Specified by:

shutdown in interface org.apache.camel.spi.ShutdownStrategy

Throws:

Exception

shutdownForced

public void shutdownForced(org.apache.camel.CamelContext context,
                           List<org.apache.camel.spi.RouteStartupOrder> routes)
                    throws Exception

Specified by:

shutdownForced in interface org.apache.camel.spi.ShutdownStrategy

Throws:

Exception

suspend

public void suspend(org.apache.camel.CamelContext context,
                    List<org.apache.camel.spi.RouteStartupOrder> routes)
             throws Exception

Specified by:

suspend in interface org.apache.camel.spi.ShutdownStrategy

Throws:

Exception

shutdown

public void shutdown(org.apache.camel.CamelContext context,
                     List<org.apache.camel.spi.RouteStartupOrder> routes,
                     long timeout,
                     TimeUnit timeUnit)
              throws Exception

Specified by:

shutdown in interface org.apache.camel.spi.ShutdownStrategy

Throws:

Exception

shutdown

public boolean shutdown(org.apache.camel.CamelContext context,
                        org.apache.camel.spi.RouteStartupOrder route,
                        long timeout,
                        TimeUnit timeUnit,
                        boolean abortAfterTimeout)
                 throws Exception

Specified by:

shutdown in interface org.apache.camel.spi.ShutdownStrategy

Throws:

Exception

suspend

public void suspend(org.apache.camel.CamelContext context,
                    List<org.apache.camel.spi.RouteStartupOrder> routes,
                    long timeout,
                    TimeUnit timeUnit)
             throws Exception

Specified by:

suspend in interface org.apache.camel.spi.ShutdownStrategy

Throws:

Exception

doShutdown

protected boolean doShutdown(org.apache.camel.CamelContext context,
                             List<org.apache.camel.spi.RouteStartupOrder> routes,
                             long timeout,
                             TimeUnit timeUnit,
                             boolean suspendOnly,
                             boolean abortAfterTimeout,
                             boolean forceShutdown)
                      throws Exception

Throws:

Exception

forceShutdown

public boolean forceShutdown(org.apache.camel.Service service)

Specified by:

forceShutdown in interface org.apache.camel.spi.ShutdownStrategy

hasTimeoutOccurred

public boolean hasTimeoutOccurred()

Specified by:

hasTimeoutOccurred in interface org.apache.camel.spi.ShutdownStrategy

setTimeout

public void setTimeout(long timeout)

Specified by:

setTimeout in interface org.apache.camel.spi.ShutdownStrategy

getTimeout

public long getTimeout()

Specified by:

getTimeout in interface org.apache.camel.spi.ShutdownStrategy

setTimeUnit

public void setTimeUnit(TimeUnit timeUnit)

Specified by:

setTimeUnit in interface org.apache.camel.spi.ShutdownStrategy

getTimeUnit

public TimeUnit getTimeUnit()

Specified by:

getTimeUnit in interface org.apache.camel.spi.ShutdownStrategy

setShutdownNowOnTimeout

public void setShutdownNowOnTimeout(boolean shutdownNowOnTimeout)

Specified by:

setShutdownNowOnTimeout in interface org.apache.camel.spi.ShutdownStrategy

isShutdownNowOnTimeout

public boolean isShutdownNowOnTimeout()

Specified by:

isShutdownNowOnTimeout in interface org.apache.camel.spi.ShutdownStrategy

isShutdownRoutesInReverseOrder

public boolean isShutdownRoutesInReverseOrder()

Specified by:

isShutdownRoutesInReverseOrder in interface org.apache.camel.spi.ShutdownStrategy

setShutdownRoutesInReverseOrder

public void setShutdownRoutesInReverseOrder(boolean shutdownRoutesInReverseOrder)

Specified by:

setShutdownRoutesInReverseOrder in interface org.apache.camel.spi.ShutdownStrategy

isSuppressLoggingOnTimeout

public boolean isSuppressLoggingOnTimeout()

Specified by:

isSuppressLoggingOnTimeout in interface org.apache.camel.spi.ShutdownStrategy

setSuppressLoggingOnTimeout

public void setSuppressLoggingOnTimeout(boolean suppressLoggingOnTimeout)

Specified by:

setSuppressLoggingOnTimeout in interface org.apache.camel.spi.ShutdownStrategy

isLogInflightExchangesOnTimeout

public boolean isLogInflightExchangesOnTimeout()

Specified by:

isLogInflightExchangesOnTimeout in interface org.apache.camel.spi.ShutdownStrategy

setLogInflightExchangesOnTimeout

public void setLogInflightExchangesOnTimeout(boolean logInflightExchangesOnTimeout)

Specified by:

setLogInflightExchangesOnTimeout in interface org.apache.camel.spi.ShutdownStrategy

getCamelContext

public org.apache.camel.CamelContext getCamelContext()

Specified by:

getCamelContext in interface org.apache.camel.CamelContextAware

setCamelContext

public void setCamelContext(org.apache.camel.CamelContext camelContext)

Specified by:

setCamelContext in interface org.apache.camel.CamelContextAware

getCurrentShutdownTaskFuture

public Future<?> getCurrentShutdownTaskFuture()

shutdownRoutesNow

protected void shutdownRoutesNow(List<org.apache.camel.spi.RouteStartupOrder> routes)

Shutdown all the consumers immediately.

Parameters:

routes - the routes to shutdown

shutdownNow

protected void shutdownNow(List<org.apache.camel.Consumer> consumers)

Shutdown all the consumers immediately.

Parameters:

consumers - the consumers to shutdown

shutdownNow

protected void shutdownNow(org.apache.camel.Consumer consumer)

Shutdown the consumer immediately.

Parameters:

consumer - the consumer to shutdown

suspendNow

protected void suspendNow(org.apache.camel.Consumer consumer)

Suspends/stops the consumer immediately.

Parameters:

consumer - the consumer to suspend

doStart

protected void doStart()
                throws Exception

Specified by:

doStart in class org.apache.camel.support.service.ServiceSupport

Throws:

Exception

doStop

protected void doStop()
               throws Exception

Specified by:

doStop in class org.apache.camel.support.service.ServiceSupport

Throws:

Exception

doShutdown

protected void doShutdown()
                   throws Exception

Overrides:

doShutdown in class org.apache.camel.support.service.ServiceSupport

Throws:

Exception

getPendingInflightExchanges

protected static int getPendingInflightExchanges(org.apache.camel.spi.RouteStartupOrder order)

Calculates the total number of inflight exchanges for the given route

Parameters:

order - the route

Returns:

number of inflight exchanges

logInflightExchanges

protected void logInflightExchanges(org.apache.camel.CamelContext camelContext,
                                    List<org.apache.camel.spi.RouteStartupOrder> routes,
                                    boolean infoLevel)

Logs information about the inflight exchanges

Parameters:

infoLevel - true to log at INFO level, false to log at DEBUG level