Java Reference
In-Depth Information
nificantly the lock duration. The first step is to construct the
Map
key associated with the
user's location, a string of the form
users.
name
.location
. This entails instantiating a
StringBuilder
object, appending several strings to it, and instantiating the result as a
String
. After the location has been retrieved, the regular expression is matched against the
resulting location string. Because constructing the key string and processing the regular ex-
pression do not access shared state, they need not be executed with the lock held.
Better-
AttributeStore
factors these steps out of the
synchronized
block, thus reducing the
time the lock is held.
