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@@ -18,9 +18,7 @@ module TokyoTyrant
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       end
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       cmd = [0xc8,mod].pack('C2') + [key.length, value.length].pack('N2') + key + value
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       @socket.write(cmd)
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-      unless (code = @socket.read(1).unpack('C').first) == 0
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-        raise "TokyoTyrant error: #{code}"
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-      end
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+      check_result_code
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       value
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     end
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@@ -29,15 +27,20 @@ module TokyoTyrant
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     def get(key)
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       cmd = [0xc8,0x30].pack('C2') + [key.length].pack('N') + key
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       @socket.write(cmd)
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-      unless (code = @socket.read(1).unpack('C').first) == 0
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-        raise "TokyoTyrant error: #{code}"
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-      end
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+      check_result_code
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       len = @socket.read(4).unpack('N').first
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       @socket.read(len)
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     end
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     alias :[] :get
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+
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+    private
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+    def check_result_code
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+      unless (code = @socket.read(1).unpack('C').first) == 0
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+        raise "TokyoTyrant error: #{code}"
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+      end
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+    end
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   end