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| author | Ben Hood <0x6e6562@gmail.com> | 2008-09-21 18:17:55 +0100 |
|---|---|---|
| committer | Ben Hood <0x6e6562@gmail.com> | 2008-09-21 18:17:55 +0100 |
| commit | 63a3c7641f4eb6ada58b5eaf28f65299400e2bea (patch) | |
| tree | a49e0d7dccaafe8125164dc6d7f7bfd01df4fab5 | |
| parent | 941d8a3740bd0a45e70b9211c2eb6b9561c9cf67 (diff) | |
| download | rabbitmq-server-git-63a3c7641f4eb6ada58b5eaf28f65299400e2bea.tar.gz | |
Added a comment about the complexity of the mnesia:select usage
| -rw-r--r-- | src/rabbit_exchange.erl | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/rabbit_exchange.erl b/src/rabbit_exchange.erl index c6fdb6eedb..df94131ce0 100644 --- a/src/rabbit_exchange.erl +++ b/src/rabbit_exchange.erl @@ -212,6 +212,16 @@ route(#exchange{name = Name, type = topic}, RoutingKey) -> topic_matches(BindingKey, RoutingKey)]), lookup_qpids(mnesia:activity(async_dirty, fun() -> qlc:e(Query) end)); +% This mnesia:select is complicated because the exchange component of the +% match head cannot be matched against a tuple. Hence I had to decompose +% a tuple match for an exchange into individual matches for its constituent +% parts. For reference, the code that does not seem to work is this: +% ... +% MatchHead = #route{binding = #binding{exchange_name = $1, +% queue_name = '$3', +% key = '$2'}}, +% Guards = [{'==', '$1', Name}, {'==', '$2', RoutingKey}], +% ... route(#exchange{name = #resource{name = Name, virtual_host = VHostPath}}, RoutingKey) -> Exchange = #resource{kind = exchange, name ='$1',virtual_host = '$2'}, MatchHead = #route{binding = #binding{exchange_name = Exchange, |