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https://issues.apache.org/jira/browse/STORM-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14227128#comment-14227128
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zhangjinlong commented on STORM-554:
------------------------------------
the type of real argument is "StormTopology", however the "get-task-object"
function use a error type declaration "TopologyContext", clojure REPL will not
raise error.
you can see this example:
; SLIME 20100404
user> (defn get_date_time [^String date] (.getTime date))
#'user/get_date_time
user> (def today (java.util.Date.))
#'user/today
user> (get_date_time today)
1416187016658
user> (def ss (String. "today"))
#'user/ss
user> (get_date_time ss)
No matching field found: getTime for class java.lang.String
[Thrown class java.lang.IllegalArgumentException]
the "get_date_time" function use a error type declaration "String" to param
date, however, there is no “getTime” method in class “String”. in fact, the
"getTime" method is defined by "java.util.Date". (get_date_time today), clojure
REPL will not raise error; but (get_date_time ss), clojure REPL must raise
error "No matching field found: getTime for class java.lang.String". the
question of "get-task-object" function is same as "get_date_time".
because the type of real argument is "StormTopology", "get-task-object" calls
"get_spouts" and "get_bolts" not raise error, but, if the type of real argument
is "TopologyContext", "get-task-object" calls "get_spouts" and "get_bolts" must
raise error. class TopologyContext do not have "get_spouts" and "get_bolts"
method.
in such a situation, clojure REPL type check will not raise error.
> the "get-task-object" function in task.clj,the type of first param "topology"
> should be ^StormTopology not ^TopologyContext
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: STORM-554
> URL: https://issues.apache.org/jira/browse/STORM-554
> Project: Apache Storm
> Issue Type: Bug
> Affects Versions: 0.9.3-rc2
> Reporter: zhangjinlong
> Assignee: zhangjinlong
> Fix For: 0.9.3-rc2
>
>
> the "get-task-object" function in task.clj,the type of first param "topology"
> should be ^StormTopology not ^TopologyContext
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