gistfile1.txt

[CODE LANGUAGE=CSHARP]
PUBLIC STATIC CLASS CACHEMANAGER {
PRIVATE STATIC CONCURRENTDICTIONARY < STRING, OBJECT > CACHELOCKS =
NEW CONCURRENTDICTIONARY < STRING, OBJECT > ();
PUBLIC STATIC EXPENSIVEOBJECT GETEXPENSIVEOBJECT() {
VAR CACHE = HTTPCONTEXT.CURRENT.CACHE;
VAR OBJ = CACHE[THE_KEY] AS EXPENSIVEOBJECT;
IF (OBJ == NULL) {
//GET A LOCK
VAR LOCKOBJECT = GETCACHELOCK(THE_KEY);
//CHECK AGAIN
IF (OBJ == NULL) {
LOCK(LOCKOBJECT) {
OBJ = GETITFROMSOURCE();
}
}
}
RETURN OBJ;
}
PRIVATE STATIC OBJECT GETCACHELOCK(STRING CACHEKEY) {
VAR LOCKOBJECT = CACHELOCKS.GETORADD(CACHEKEY,
O => NEW OBJECT());
RETURN LOCKOBJECT;
}
}
[/CODE]