Package org.apache.camel.impl.engine

Class DefaultShutdownStrategy

java.lang.Object
org.apache.camel.support.service.BaseService
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 45 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 45 seconds 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.BaseService

    BUILT, FAILED, INITIALIZED, INITIALIZING, lock, NEW, SHUTDOWN, SHUTTING_DOWN, STARTED, STARTING, status, STOPPED, STOPPING, SUSPENDED, SUSPENDING

  • Constructor Summary

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

  • Method Summary

    Modifier and Type
    Method
    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()
     
    org.apache.camel.CamelContext
    getCamelContext()
     
    Future<?>
    getCurrentShutdownTaskFuture()
    Future for the current shutdown task, when a task is in progress.
    org.apache.camel.LoggingLevel
    getLoggingLevel()
     
    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
    isForceShutdown()
     
    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
    setLoggingLevel(org.apache.camel.LoggingLevel loggingLevel)
     
    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(String routeId, List<org.apache.camel.Consumer> consumers)
    Shutdown all the consumers immediately.
    protected void
    shutdownNow(String routeId, org.apache.camel.Consumer consumer)
    Shutdown the consumer 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(String routeId, org.apache.camel.Consumer consumer)
    Suspends/stops the consumer immediately.

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

    build, doBuild, doFail, doInit, doLifecycleChange, doResume, doSuspend, fail, 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.ShutdownableService

    shutdown

    Methods inherited from interface org.apache.camel.StatefulService

    getStatus, isRunAllowed, isStarted, isStarting, isStopped, isStopping, isSuspending

    Methods inherited from interface org.apache.camel.SuspendableService

    isSuspended, resume, suspend

  • Constructor Details

    • DefaultShutdownStrategy

      public DefaultShutdownStrategy()

    • DefaultShutdownStrategy

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

  • Method Details

    • 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

    • isForceShutdown

      public boolean isForceShutdown()
      Specified by:
      isForceShutdown 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

    • getLoggingLevel

      public org.apache.camel.LoggingLevel getLoggingLevel()
      Specified by:
      getLoggingLevel in interface org.apache.camel.spi.ShutdownStrategy

    • setLoggingLevel

      public void setLoggingLevel(org.apache.camel.LoggingLevel loggingLevel)
      Specified by:
      setLoggingLevel 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()
      Future for the current shutdown task, when a task is in progress.

      Important: This API is only for advanced use-cases.

    • 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(String routeId, List<org.apache.camel.Consumer> consumers)
      Shutdown all the consumers immediately.
      Parameters:
      routeId - the route id to suspend
      consumers - the consumers to shutdown

    • shutdownNow

      protected void shutdownNow(String routeId, org.apache.camel.Consumer consumer)
      Shutdown the consumer immediately.
      Parameters:
      routeId - the route id to suspend
      consumer - the consumer to shutdown

    • suspendNow

      protected void suspendNow(String routeId, org.apache.camel.Consumer consumer)
      Suspends/stops the consumer immediately.
      Parameters:
      routeId - the route id to suspend
      consumer - the consumer to suspend

    • doStart

      protected void doStart() throws Exception
      Overrides:
      doStart in class org.apache.camel.support.service.BaseService
      Throws:
      Exception

    • doStop

      protected void doStop() throws Exception
      Overrides:
      doStop in class org.apache.camel.support.service.BaseService
      Throws:
      Exception

    • doShutdown

      protected void doShutdown() throws Exception
      Overrides:
      doShutdown in class org.apache.camel.support.service.BaseService
      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