Domains are useful to categorize and debug the error, even if you shutdown,
don't just throw them away.
For performance starved JS (talking working under 50MB in a production
area) idempotentcy / stateless arch generally results in memory usage or
offloading to a single authority. Single authority requires well thought
out recovery if the app dies from something bad happening. Statelessness if
in a resource constrained system that cannot offload to say a remote DB is
just going to be a TON of book keeping and memory management in JS is
difficult to predict (generally we move to C/C++ at that point).
Promises vs nested branch (sans q):
```
//make a promise to start the workflow
onuser=db.getUser(x)
//branch 1
onuser.then(db.isUserActive)
//branch 2
ongroups= onuser.then(db.getGroupsForUser)
//branch 2.1
ongroups.then(db.getPermForGroups.bind(db, 'dotask'))
//branch 2.2
ongroups.then(db.getGroupsActive)
ongroups.fail(onuser.fail.bind(onuser))
//branch 3
onuser.then(db.getPermForUser.bind(db, 'dotask'))
//join
// don't feel like writing the .then joins by hand...
onuser.fail(joined.fail.bind(joined))
joined.then(win).fail(blah)
```
With Q fixing the anger; to look a lot like async.parallel
```
onuser=db.getUser(x)
onuser.then(Q.all([
db.isUserActive,
db.getGroupsForUser.then(Q.all([
db.getPermForGroups.bind(db, 'dotask'),
db.getGroupsActive
]))
db.getPermForUser.bind(db, 'dotask')
])).then(win).fail(blah)
```
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