asyncache

Transparently cache your asynchronous get functions.

Usage

asyncGetFunction = cache.remember(asyncGetFunction)

asyncDeleteFunction = cache.forget(asyncDeleteFunction)

Example:

var cache = require('asyncache')();
// implement cache methods
cache.set = function(key, value, ttl, cb) { /* ... */ };
cache.get = function(key, cb) { /* ... */ };
cache.del = function(key, cb) { /* ... */ };
 
// sample async function
var getUserDetails = function(userId, cb) {
  database.get(userId, function(err, user) {
    cb(err, user);
  });
};
 
getUserDetails = cache.remember(getUserDetails);
 
// this function will fetch the result from the db
getUserDetails(19384, function(err, user) {
  // now the result will be fetched from cache
  getUserDetails(19384, function(err, user) {
    // faster
  });
});

For more complete implementations checkout the /examples folder. For more details read the source code, Luke.

Note

Be aware that cache.remember() and cache.forget() are not atomic unless you implement that by yourself inside cache.set() and cache.del() (which are used internally be the previous two). That means that unless you use some kind of lock you might end up with old data in your cache.

Tests

npm test

License

MIT