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@@ -51,9 +51,12 @@ module Delayed
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       unless object.respond_to?(:perform)
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         raise ArgumentError, 'Cannot enqueue items which do not respond to perform' 
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       end
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+      Job.create(:payload_object => object, :priority => priority)
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+    end
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-      Job.create(:payload_object => object, :priority => priority)    
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-    end                    
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+    def self.enqueue_unique(object, priority = 0)
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+      self.enqueue(object, priority) if Job.count( :conditions => ["handler = :h", { :h => object.to_yaml }] ).zero?
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+    end
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     def self.find_available(limit = 5)
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       time_now = db_time_now

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@@ -1,7 +1,11 @@
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 module Delayed
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   module MessageSending
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-    def send_later(method, *args)                                
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+    def send_later(method, *args)
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       Delayed::Job.enqueue Delayed::PerformableMethod.new(self, method.to_sym, args)
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     end
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+    
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+    def send_later_unique(method, *args)
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+      Delayed::Job.enqueue_unique Delayed::PerformableMethod.new(self, method.to_sym, args)
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+    end
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   end  
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 end
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\ No newline at end of file

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@@ -53,7 +53,11 @@ describe 'random ruby objects' do
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     RandomRubyObject.new.respond_to?(:send_later)   
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-  end     
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+  end
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+  
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+  it "should respond_to :send_later_unique method" do
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+    RandomRubyObject.new.respond_to?(:send_later_unique)
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+  end
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   it "should raise a ArgumentError if send_later is called but the target method doesn't exist" do
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     lambda { RandomRubyObject.new.send_later(:method_that_deos_not_exist) }.should raise_error(NoMethodError)
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@@ -67,6 +71,23 @@ describe 'random ruby objects' do
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     Delayed::Job.count.should == 1
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   end
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+  it "should add a new entry to the job table when send_later_unique is called on it" do
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+    Delayed::Job.count.should == 0
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+    
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+    RandomRubyObject.new.send_later_unique(:to_s)
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+
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+    Delayed::Job.count.should == 1
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+  end
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+  
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+  it "should not add a new entry to the job table when send_later_unique is called for an already scheduled job" do
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+    Delayed::Job.count.should == 0
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+    
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+    RandomRubyObject.new.send_later_unique(:to_s)
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+    RandomRubyObject.new.send_later_unique(:to_s)
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+
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+    Delayed::Job.count.should == 1
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+  end
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+  
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   it "should run get the original method executed when the job is performed" do
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     RandomRubyObject.new.send_later(:say_hello)

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@@ -29,6 +29,12 @@ describe Delayed::Job do
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     Delayed::Job.count.should == 1
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   end
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+  it "should not increase count after enqueing items that already exist in the queue" do
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+    Delayed::Job.enqueue_unique SimpleJob.new
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+    Delayed::Job.enqueue_unique SimpleJob.new
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+    Delayed::Job.count.should == 1
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+  end
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+  
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   it "should call perform on jobs when running work_off" do        
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     SimpleJob.runs.should == 0
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