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module Unleash
class ScheduledExecutor
attr_accessor :name, :interval, :max_exceptions, :retry_count, :thread
def initialize(name, interval, max_exceptions = 5)
self.name = name || ''
self.interval = interval
self.max_exceptions = max_exceptions
self.retry_count = 0
self.thread = nil
end
def run(&blk)
self.thread = Thread.new do
Thread.current[:name] = self.name
Unleash.logger.debug "thread #{name} loop starting"
loop do
Unleash.logger.debug "thread #{name} sleeping for #{interval} seconds"
sleep interval
run_blk{ blk.call }
if exceeded_max_exceptions?
Unleash.logger.error "thread #{name} retry_count (#{self.retry_count}) exceeded " \
"max_exceptions (#{self.max_exceptions}). Stopping with retries."
break
end
end
Unleash.logger.debug "thread #{name} loop ended"
end
end
def running?
self.thread.is_a?(Thread) && self.thread.alive?
end
def exit
if self.running?
Unleash.logger.warn "thread #{name} will exit!"
self.thread.exit
self.thread.join if self.running?
else
Unleash.logger.info "thread #{name} was already stopped!"
end
end
private
def run_blk(&blk)
Unleash.logger.debug "thread #{name} starting execution"
yield(blk)
self.retry_count = 0
rescue StandardError => e
self.retry_count += 1
Unleash.logger.error "thread #{name} threw exception #{e.class} " \
" (#{self.retry_count}/#{self.max_exceptions}): '#{e}'"
Unleash.logger.debug "stacktrace: #{e.backtrace}"
end
def exceeded_max_exceptions?
self.retry_count > self.max_exceptions
end
end
end
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