Created
August 20, 2011 13:19
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nodejs callbackDriven vs node-async vs node-sync
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function getUserSummary(userId, callback) | |
{ | |
async.parallel({ | |
user : function(callback) { | |
db.users.findUserById(userId, callback) | |
}, | |
tweets : function(callback) { | |
db.users.getTweets(userId, callback) | |
}, | |
getFollowers : function(callback) { | |
db.users.getFollowers(userId, callback) | |
}, | |
getFollowing : function(callback) { | |
db.users.getFollowing(userId, callback) | |
} | |
}, callback) | |
} |
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function getUserSummary(userId, callback) | |
{ | |
db.users.findUserById(userId, function(err, user){ | |
if (err) return callback(err); | |
db.users.getTweets(userId, function(err, tweets){ | |
if (err) return callback(err); | |
db.users.getFollowers(userId, function(err, followers){ | |
if (err) return callback(err); | |
db.users.getFollowing(userId, function(err, following){ | |
if (err) return callback(err); | |
callback(null, { | |
user : user, | |
tweets : tweets, | |
followers : followers, | |
following : following | |
}) | |
}) | |
}) | |
}) | |
}) | |
} |
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var getUserSummary = function(userId) | |
{ | |
return { | |
user : db.users.findUserById(userId), | |
tweets : db.users.getTweets(userId), | |
followers : db.users.getFollowers(userId), | |
following : db.users.getFollowing(userId) | |
} | |
}.async() |
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var getUserSummary = function(userId) | |
{ | |
var dbUsers = db.users; | |
var user = dbUsers.findUserById.future(dbUsers, userId), | |
tweets = dbUsers.getTweets.future(dbUsers, userId), | |
followers = dbUsers.getFollowers.future(dbUsers, userId), | |
following = dbUsers.getFollowing.future(dbUsers, userId); | |
return { | |
user : user.result, | |
tweets : tweets.result, | |
followers : followers.result, | |
following : following.result | |
} | |
}.async() |
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