Runtime does not call some of the listeners during dispatchEvent

krystian6 · March 3, 2014, 11:45am

Hello,

I’ve got a weird scenario, where I register 5 event listeners for particular event, and only 3 of them are fired.

I’ve tried to reproduce this issue in a sample project, but as usual, this is not trivial.

Anyway, I was hoping someone could help me understand how Runtime event dispatch works. I’ve tried to simulate it and created my own dispatcher, and using it - it works just fine.

Anyway…

The function listening for the event, will remove itself as a listener (inside there’s the Runtime:removeEventListener call), so it’s easy to spot how many of them are not called.

Here’s how the Runtime._functionListeners.myEvent look like before the dispatch:

2014-03-03 11:54:10.868 Corona Simulator[5178:507] SHALLOW PRINTING TABLE table: 0x7fe27b5d93e0 [@level:167] 2014-03-03 11:54:10.868 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;1 &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe27b5d9300 2014-03-03 11:54:10.868 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;2 &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe283572f80 2014-03-03 11:54:10.868 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;3 &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe281eb80c0 2014-03-03 11:54:10.868 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;4 &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe28538a790 2014-03-03 11:54:10.868 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;5 &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe2851819b0 2014-03-03 11:54:10.868 Corona Simulator[5178:507] SHALLOW FINISHED PRINTING TABLE &nbsp;

Here’s the object with the function to be called “in it”: [not the address of the removeMe function]

2014-03-03 11:54:10.866 Corona Simulator[5178:507] --------------&nbsp;&nbsp;&nbsp;&nbsp;53806.838&nbsp;&nbsp;&nbsp;&nbsp;-------------- 2014-03-03 11:54:10.866 Corona Simulator[5178:507] SHALLOW PRINTING TABLE table: 0x7fe283571f90 [@level:166] 2014-03-03 11:54:10.866 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;show &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe2835283d0 2014-03-03 11:54:10.866 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;\_proxy &nbsp;&nbsp;&nbsp;&nbsp; : userdata: 0x7fe283571f88 2014-03-03 11:54:10.866 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;removeSelf &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe283572580 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;removeMe &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe283572f80 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;\_class &nbsp;&nbsp;&nbsp;&nbsp; { 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;removeEventListener &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe285394630 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;addEventListener &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe2853945d0 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\_\_index &nbsp;&nbsp;&nbsp;&nbsp; { 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;} 2014-03-03 11:54:10.867 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;hide &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe283528440 2014-03-03 11:54:10.867 Corona Simulator[5178:507] SHALLOW FINISHED PRINTING TABLE 2014-03-03 11:54:10.867 Corona Simulator[5178:507] -------------- &nbsp;

and here’s the Runtime._functionListeners.myEvent after the dispatch:

2014-03-03 11:54:10.949 Corona Simulator[5178:507] --------------&nbsp;&nbsp;&nbsp;&nbsp;53890.056&nbsp;&nbsp;&nbsp;&nbsp;-------------- 2014-03-03 11:54:10.949 Corona Simulator[5178:507] SHALLOW PRINTING TABLE table: 0x7fe27b5d93e0 [@level:169] 2014-03-03 11:54:10.949 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;1 &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe283572f80 2014-03-03 11:54:10.950 Corona Simulator[5178:507] &nbsp;&nbsp;&nbsp;&nbsp;2 &nbsp;&nbsp;&nbsp;&nbsp; : function: 0x7fe28538a790 2014-03-03 11:54:10.950 Corona Simulator[5178:507] SHALLOW FINISHED PRINTING TABLE 2014-03-03 11:54:10.950 Corona Simulator[5178:507] -------------- &nbsp;

Inside every function listening for “myEvent” event, I’ve got a print as the first line, so I can determine which one was called and which was not. They were not

I’m just wondering, how is this possible?

Krystian