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# encoding: UTF-8
require 'mauve/datamapper'
require 'log4r'
module Mauve
#
# Class to record changes to alerts. Also responsible for keeping records for reminders.
#
class AlertChanged
include DataMapper::Resource
# so .first always returns the most recent update
default_scope(:default).update(:order => [:at.desc, :id.desc])
property :id, Serial
property :alert_id, Integer, :required => true
property :person, String, :required => true
property :at, EpochTime, :required => true
property :was_relevant, Boolean, :required => true, :default => true
property :level, String, :required => true
property :update_type, String, :required => true
property :remind_at, EpochTime, :required => false
belongs_to :alert
before :valid?, :do_set_timestamps
protected
def do_set_timestamps(context = :default)
self.at = Time.now unless self.original_attributes.has_key?("at")
end
public
# @return [String]
def to_s
"#<AlertChanged #{id}: alert_id #{alert_id}, for #{person}, update_type #{update_type}>"
end
# @deprecated I don't think was_relevant is used any more.
#
def was_relevant=(value)
attribute_set(:was_relevant, value)
end
# The time this object was last updated
#
# @return [Time]
def updated_at
self.at
end
# Set the time this object was last updated
#
# @param [Time] t
# @return [Time]
def updated_at=(t)
self.at = t
end
# @return [Log4r::Logger]
def logger
Log4r::Logger.new self.class.to_s
end
# Sends a reminder about this alert state change, or forget about it if
# the alert has been acknowledged
#
# @return [Boolean] indicating successful update of the AlertChanged object
def remind
unless alert.is_a?(Alert)
logger.info "#{self.inspect} lost alert #{alert_id}. Killing self."
destroy!
return false
end
if !alert_group
logger.info("No alert group matches any more. Clearing reminder for #{self.alert}.")
self.remind_at = nil
return save
end
if alert.acknowledged? or alert.cleared?
logger.info("Alert already acknowledged/cleared. Clearing reminder due for #{self.alert}.")
self.remind_at = nil
return save
end
#
# Postpone reminders from previous runs, if needed.
#
if Server.instance.in_initial_sleep? and
self.at < Server.instance.started_at
self.remind_at = Server.instance.started_at + Server.instance.initial_sleep
logger.info("Postponing reminder for #{self.alert} until #{self.remind_at} since this reminder was updated in a prior run of Mauve.")
return save
end
alert_group.notify(alert, Time.now)
#
# Need to make sure this reminder is cleared.
#
self.remind_at = nil
save
end
# The time this AlertChanged should next be polled at, or nil. Mimics
# interaface from Alert.
#
# @return [Time, NilClass]
def due_at
remind_at ? remind_at : nil
end
# Sends a reminder, if needed. Mimics interaface from Alert.
#
# @return [Boolean] showing polling was successful
def poll # mimic interface from Alert
logger.debug("Polling #{self.to_s}")
if remind_at.is_a?(Time) and remind_at <= Time.now
remind
else
true
end
end
# The AlertGroup for this object
#
# @return [Mauve::AlertGroup]
def alert_group
alert.alert_group
end
class << self
# Finds the next reminder due, or nil if nothing due.
#
# @return [Mauve::AlertChanged, NilClass]
def next_reminder
first(:remind_at.not => nil, :order => [:remind_at])
end
# Finds the next event due. Mimics interface from Alert.
#
# @return [Mauve::AlertChanged, NilClass]
def find_next_with_event
next_reminder
end
# @deprecated I don't think this is used any more.
#
# @return [Array]
def all_overdue(at = Time.now)
all(:remind_at.not => nil, :remind_at.lt => at, :order => [:remind_at]).to_a
end
end
end
end
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