Re: [undertow-dev] Should AttachmentKey implement equals?
This is by design. The map that holds the keys is an identity hash map.
If we just did equality based on the class then it would be impossible to have two
different attachments of the same type, which although not super common does occur.
There is no real need to pass the keys around, just make them a static final field
somewhere.
Stuart
----- Original Message -----
From: "Shannon Lloyd" <shanloid(a)gmail.com>
To: undertow-dev(a)lists.jboss.org
Sent: Monday, 23 December, 2013 5:39:47 AM
Subject: [undertow-dev] Should AttachmentKey implement equals?
Hi,
I'm noticing that I can't pull an attachment back off the exchange using
AttachmentKey.create(Class), presumably because AttachmentKey (or rather
SimpleAttachmentKey) doesn't override equals to compare based on the wrapped
Class object, so it's using object identity, which obviously doesn't work.
Is this by design? Do I need to hold onto the key I used to add the
attachment in the first place? This seems a bit counter-intuitive, as it
means pushing keys around between handlers, when simply implementing equals
on the key would avoid that. Am I supposed to provide my own key
implementation (i.e basically rewrite SimpleAttachment key - I can't believe
that this is the answer)?
Or am I just missing something obvious?
Cheers,
Shannon
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