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LOGGER.progname = File.expand_path(__FILE__)
DEFAULT_TASK_MAX_DURATION = 120
EXTERNAL_TASK_MAX_DURATION = 60
$self_task=nil
module OpenTox
class Task
# due_to_time is only set in local tasks
TASK_ATTRIBS = [ :uri, :date, :title, :creator, :title, :description, :hasStatus, :percentageCompleted, :resultURI, :due_to_time ]
TASK_ATTRIBS.each{ |a| attr_accessor(a) }
private
def initialize(uri)
@uri = uri.to_s.strip
end
# create is private now, use OpenTox::Task.as_task
def self.create(max_duration)
task_uri = RestClientWrapper.post(@@config[:services]["opentox-task"], {:max_duration => max_duration}, nil, false).to_s
Task.find(task_uri.chomp)
end
public
def self.find(uri)
task = Task.new(uri)
task.reload
return task
end
# test_if_task = true -> error suppressed if data is no task, nil is returned
def self.from_data(data, content_type, base_uri, test_if_task)
task = Task.new(nil)
task.reload_from_data(data, content_type, base_uri, test_if_task)
if test_if_task and (!task.uri or task.uri.strip.size==0)
return nil
else
return task
end
end
def reload
result = RestClientWrapper.get(uri, {:accept => 'application/rdf+xml'})#'text/x-yaml'})
reload_from_data(result, result.content_type, uri, false)
end
# test_if_task = true -> error suppressed if data is no task, empty task is returned
def reload_from_data( data, content_type, base_uri, test_if_task )
case content_type
when /text\/x-yaml/
task = YAML.load data
TASK_ATTRIBS.each do |a|
raise "task yaml data invalid, key missing: "+a.to_s unless task.has_key?(a)
send("#{a.to_s}=".to_sym,task[a])
end
when /application\/rdf\+xml/
owl = OpenTox::Owl.from_data(data,base_uri,"Task",test_if_task)
if owl
self.uri = owl.uri
(TASK_ATTRIBS-[:uri]).each{|a| self.send("#{a.to_s}=".to_sym, owl.get(a.to_s))}
end
else
raise "content type for tasks not supported: "+content_type.to_s
end
raise "uri is null after loading" unless @uri and @uri.to_s.strip.size>0 unless test_if_task
end
def cancel
RestClientWrapper.put(File.join(@uri,'Cancelled'))
reload
end
def completed(uri)
RestClientWrapper.put(File.join(@uri,'Completed'),{:resultURI => uri})
reload
end
def error(description)
RestClientWrapper.put(File.join(@uri,'Error'),{:description => description})
reload
end
def pid=(pid)
RestClientWrapper.put(File.join(@uri,'pid'), {:pid => pid})
end
def running?
@hasStatus.to_s == 'Running'
end
def completed?
@hasStatus.to_s == 'Completed'
end
def error?
@hasStatus.to_s == 'Error'
end
# waits for a task, unless time exceeds or state is no longer running
def wait_for_completion(dur=0.3)
if (@uri.match(@@config[:services]["opentox-task"]))
due_to_time = Time.parse(@due_to_time)
else
# the date of the external task cannot be trusted, offest to local time might be to big
due_to_time = Time.new + EXTERNAL_TASK_MAX_DURATION
end
LOGGER.debug "start waiting for task "+@uri.to_s+" at: "+Time.new.to_s+", waiting at least until "+due_to_time.to_s
while self.running?
sleep dur
reload
if (Time.new > due_to_time)
raise "max waiting time exceeded, task seems to be stalled, task: '"+@uri.to_s+"'"
end
end
end
# returns the task uri
# catches halts and exceptions, task state is set to error then
def self.as_task(max_duration=DEFAULT_TASK_MAX_DURATION)
#return yield nil
task = OpenTox::Task.create(max_duration)
task_pid = Spork.spork(:logger => LOGGER) do
LOGGER.debug "Task #{task.uri} started #{Time.now}"
$self_task = task
begin
result = catch(:halt) do
yield task
end
# catching halt, set task state to error
if result && result.is_a?(Array) && result.size==2 && result[0]>202
LOGGER.error "task was halted: "+result.inspect
task.error(result[1])
return
end
LOGGER.debug "Task #{task.uri} done #{Time.now} -> "+result.to_s
task.completed(result)
rescue => ex
LOGGER.error "task failed: "+ex.message
task.error(ex.message)
end
end
task.pid = task_pid
LOGGER.debug "Started task: "+task.uri.to_s
task.uri
end
end
end
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