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|
$self_task=nil
module OpenTox
class Task
# due_to_time is only set in local tasks
TASK_ATTRIBS = [ :uri, :date, :title, :creator, :description, :hasStatus, :percentageCompleted, :resultURI, :due_to_time ]
TASK_ATTRIBS.each{ |a| attr_accessor(a) }
attr_accessor :http_code
private
def initialize(uri)
@uri = uri.to_s.strip
end
# create is private now, use OpenTox::Task.as_task
def self.create( params )
task_uri = RestClientWrapper.post(@@config[:services]["opentox-task"], params, nil, false).to_s
Task.find(task_uri.chomp)
end
public
def self.find( uri, accept_header=nil )
task = Task.new(uri)
task.reload( accept_header )
return task
end
def self.from_data(data, content_type, code, base_uri)
task = Task.new(nil)
task.http_code = code
task.reload_from_data(data, content_type, base_uri)
return task
end
def reload( accept_header=nil )
unless accept_header
if (@@config[:yaml_hosts].include?(URI.parse(uri).host))
accept_header = "application/x-yaml"
else
accept_header = 'application/rdf+xml'
end
end
result = RestClientWrapper.get(uri, {:accept => accept_header}, false)#'application/x-yaml'})
@http_code = result.code
reload_from_data(result, result.content_type, uri)
end
def reload_from_data( data, content_type, base_uri )
case content_type
when /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")
self.uri = owl.uri
(TASK_ATTRIBS-[:uri]).each{|a| self.send("#{a.to_s}=".to_sym, owl.get(a.to_s))}
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
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.to_s[0..2000]})
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 = (@due_to_time.is_a?(Time) ? @due_to_time : Time.parse(@due_to_time))
running_time = due_to_time - (@date.is_a?(Time) ? @date : Time.parse(@date))
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
running_time = 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
check_state
if (Time.new > due_to_time)
raise "max wait time exceeded ("+running_time.to_s+"sec), task: '"+@uri.to_s+"'"
end
end
LOGGER.debug "Task '"+@hasStatus+"': "+@uri.to_s+", Result: "+@resultURI.to_s
end
def check_state
begin
raise "illegal task state, task is completed, resultURI is no URI: '"+@resultURI.to_s+
"'" unless @resultURI and Utils.is_uri?(@resultURI) if completed?
if @http_code == 202
raise "illegal task state, code is 202, but hasStatus is not Running: '"+@hasStatus+"'" unless running?
elsif @http_code == 201
raise "illegal task state, code is 201, but hasStatus is not Completed: '"+@hasStatus+"'" unless completed?
raise "illegal task state, code is 201, resultURI is no task-URI: '"+@resultURI.to_s+
"'" unless @resultURI and Utils.task_uri?(@resultURI)
end
rescue => ex
RestClientWrapper.raise_uri_error(ex.message, @uri)
end
end
# returns the task uri
# catches halts and exceptions, task state is set to error then
def self.as_task( title, creator, max_duration=DEFAULT_TASK_MAX_DURATION, description=nil )
#return yield nil
params = {:title=>title, :creator=>creator, :max_duration=>max_duration, :description=>description }
task = OpenTox::Task.create(params)
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
LOGGER.error ": "+ex.backtrace.join("\n")
task.error(ex.message)
end
end
task.pid = task_pid
LOGGER.debug "Started task: "+task.uri.to_s
task.uri
end
end
end
|
