Apex Reference Guide
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CacheBuilder Interface
An interface for safely retrieving and removing values from a
session or org cache. Use the interface to generate a value that you want to store in
the cache. The interface checks for cache misses, which means you no longer need to
check for null cache values yourself.
Namespace
CacheBuilder Methods
The following are methods for CacheBuilder.
doLoad(var)
Contains the logic that builds a cached value. You don’t call this
method directly. Instead, it’s called indirectly when you reference the class that implements
the CacheBuilder interface.
Signature
public Object doLoad(String var)
Parameters
- var
- Type: String
- A case-sensitive string value used to build a cached value. This parameter is also used as part of the unique key that identifies the cached value.
Return Value
Type: Object
The value that was cached. Cast the return value to the appropriate type.
CacheBuilder Example Implementation
This example creates a class called UserInfoCache that implements the CacheBuilder interface. The class caches the results of a SOQL query run against the User object.
class UserInfoCache implements Cache.CacheBuilder {
public Object doLoad(String userid) {
User u = (User)[SELECT Id, IsActive, username FROM User WHERE id =: userid];
return u;
}
}This example gets a cached User record based on a user ID. If the value exists in the org cache, it is returned. If the value doesn’t exist, the doLoad(String var) method is re-executed, and the new value is cached and returned.
User batman = (User) Cache.Org.get(UserInfoCache.class, ‘00541000000ek4c');