Class: Trinidad::Lifecycle::Host::RollingReload

Inherits:
Object
  • Object
show all
Defined in:
lib/trinidad/lifecycle/host/rolling_reload.rb

Overview

Rolls a new context that replaces the current one on reloads.

Defined Under Namespace

Classes: Takeover

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(server) ⇒ RollingReload

Returns a new instance of RollingReload.



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# File 'lib/trinidad/lifecycle/host/rolling_reload.rb', line 8

def initialize(server)
  @server = server
end

Class Method Details

.logger ⇒ Object

log into the same location as context.reload does :



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# File 'lib/trinidad/lifecycle/host/rolling_reload.rb', line 52

def self.logger # log into the same location as context.reload does :
  Trinidad::Logging::LogFactory.getLog('org.apache.catalina.core.StandardContext')
end

Instance Method Details

#reload!(app_holder) ⇒ Object 



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# File 'lib/trinidad/lifecycle/host/rolling_reload.rb', line 12

def reload!(app_holder)
  web_app, old_context = app_holder.web_app, app_holder.context
  logger = self.class.logger
  logger.info "Context with name [#{old_context.name}] has started rolling"

  web_app.reset! # force a new class loader + re-read state (from config)
  no_host = org.apache.catalina.Host.impl {} # do not add to parent yet
  new_context = @server.add_web_app(web_app, no_host, false)
  # Tomcat requires us to have unique names for its containers :
  new_context.name = "#{old_context.name}-#{java.lang.System.currentTimeMillis}"
  new_context.add_lifecycle_listener(takeover = Takeover.new(old_context))
  app_holder.context = new_context

  Thread.new do
    begin
      logger.debug "Starting a new Context for [#{new_context.path}]"
      old_context.parent.add_child new_context # NOTE: likely starts!
      
      new_context.start unless new_context.state_name =~ /START|STOP|FAILED/i
      
      if new_context.state_name =~ /STOP|FAILED/i
        logger.error("Context with name [#{old_context.name}] failed rolling")
        takeover.failed!(new_context)
      else
        logger.info "Context with name [#{old_context.name}] has completed rolling"
      end
    rescue => error
      e = org.jruby.exceptions.RaiseException.new(error)
      logger.error("Context with name [#{old_context.name}] failed rolling", e)
      takeover.failed!(new_context)
    rescue java.lang.Exception => e
      logger.error("Context with name [#{old_context.name}] failed rolling", e)
      takeover.failed!(new_context)
    ensure
      app_holder.unlock
    end
  end
  false # not yet reloaded do not release lock
end