implemented timeout for job execution

lib/delayed/job.rb

@@ -1,3 +1,5 @@
+require 'timeout'
+
 module Delayed
 
   class DeserializationError < StandardError
@@ -89,7 +91,7 @@ def run_with_lock(max_run_time, worker_name)
 
       begin
         runtime =  Benchmark.realtime do
-          invoke_job # TODO: raise error if takes longer than max_run_time
+          Timeout.timeout(max_run_time.to_i) { invoke_job }
           destroy
         end
         # TODO: warn if runtime > max_run_time ?

spec/job_spec.rb

@@ -10,6 +10,10 @@ class ErrorJob
   def perform; raise 'did not work'; end
 end             
 
+class LongRunningJob
+  def perform; sleep 250; end
+end
+
 module M
   class ModuleJob
     cattr_accessor :runs; self.runs = 0
@@ -171,6 +175,13 @@ def perform; @@runs += 1; end
     Delayed::Job.destroy_failed_jobs = default
   end
 
+  it "should fail after MAX_RUN_TIME" do
+    @job = Delayed::Job.create :payload_object => LongRunningJob.new
+    Delayed::Job.reserve_and_run_one_job(1.second)
+    @job.reload.last_error.should =~ /expired/
+    @job.attempts.should == 1
+  end
+
   it "should never find failed jobs" do
     @job = Delayed::Job.create :payload_object => SimpleJob.new, :attempts => 50, :failed_at => Time.now
     Delayed::Job.find_available(1).length.should == 0