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structure LruCache : sig
val cache : Cache.cache
end = struct
(* Mono *)
open Mono
val dummyLoc = ErrorMsg.dummySpan
val stringTyp = (TFfi ("Basis", "string"), dummyLoc)
val optionStringTyp = (TOption stringTyp, dummyLoc)
fun withTyp typ = map (fn exp => (exp, typ))
fun ffiAppCache' (func, index, argTyps) =
EFfiApp ("Sqlcache", func ^ Int.toString index, argTyps)
fun check (index, keys) =
ffiAppCache' ("check", index, withTyp stringTyp keys)
fun store (index, keys, value) =
ffiAppCache' ("store", index, (value, stringTyp) :: withTyp stringTyp keys)
fun flush (index, keys) =
ffiAppCache' ("flush", index, withTyp optionStringTyp keys)
fun lock (index, write) =
ffiAppCache' ((if write then "w" else "r") ^ "lock", index, [])
(* Cjr *)
open Print
open Print.PD
fun setupQuery {index, params} =
let
val i = Int.toString index
fun paramRepeat itemi sep =
let
fun f n =
if n < 0 then ""
else if n = 0 then itemi (Int.toString 0)
else f (n-1) ^ sep ^ itemi (Int.toString n)
in
f (params - 1)
end
fun paramRepeatRev itemi sep =
let
fun f n =
if n < 0 then ""
else if n = 0 then itemi (Int.toString 0)
else itemi (Int.toString n) ^ sep ^ f (n-1)
in
f (params - 1)
end
fun paramRepeatInit itemi sep =
if params = 0 then "" else sep ^ paramRepeat itemi sep
val typedArgs = paramRepeatInit (fn p => "uw_Basis_string p" ^ p) ", "
val revArgs = paramRepeatRev (fn p => "p" ^ p) ", "
in
Print.box
[string ("static uw_Sqlcache_Cache cacheStruct" ^ i ^ " = {"),
newline,
string " .lock = PTHREAD_RWLOCK_INITIALIZER,",
newline,
string " .table = NULL,",
newline,
string (" .numKeys = " ^ Int.toString params ^ ","),
newline,
string " .timeInvalid = 0,",
newline,
string " .timeNow = 0};",
newline,
string ("static uw_Sqlcache_Cache *cache" ^ i ^ " = &cacheStruct" ^ i ^ ";"),
newline,
newline,
string ("static uw_Basis_string uw_Sqlcache_check" ^ i),
string ("(uw_context ctx" ^ typedArgs ^ ") {"),
newline,
string (" char *ks[] = {" ^ revArgs ^ "};"),
newline,
string (" uw_Sqlcache_Value *v = uw_Sqlcache_check(ctx, cache" ^ i ^ ", ks);"),
newline,
(* If the output is null, it means we had too much recursion, so it's a miss. *)
string " if (v && v->output != NULL) {",
newline,
string (" puts(\"SQLCACHE: hit " ^ i ^ ".\");"),
newline,
string " uw_write(ctx, v->output);",
newline,
string " return v->result;",
newline,
string " } else {",
newline,
string (" puts(\"SQLCACHE: miss " ^ i ^ ".\");"),
newline,
string " uw_recordingStart(ctx);",
newline,
string " return NULL;",
newline,
string " }",
newline,
string "}",
newline,
newline,
string ("static uw_unit uw_Sqlcache_store" ^ i),
string ("(uw_context ctx, uw_Basis_string s" ^ typedArgs ^ ") {"),
newline,
string (" char *ks[] = {" ^ revArgs ^ "};"),
newline,
string (" uw_Sqlcache_Value *v = malloc(sizeof(uw_Sqlcache_Value));"),
newline,
string " v->result = strdup(s);",
newline,
string " v->output = uw_recordingRead(ctx);",
newline,
string (" puts(\"SQLCACHE: stored " ^ i ^ ".\");"),
newline,
string (" uw_Sqlcache_store(ctx, cache" ^ i ^ ", ks, v);"),
newline,
string " return uw_unit_v;",
newline,
string "}",
newline,
newline,
string ("static uw_unit uw_Sqlcache_flush" ^ i),
string ("(uw_context ctx" ^ typedArgs ^ ") {"),
newline,
string (" char *ks[] = {" ^ revArgs ^ "};"),
newline,
string (" uw_Sqlcache_flush(ctx, cache" ^ i ^ ", ks);"),
newline,
string " return uw_unit_v;",
newline,
string "}",
newline,
newline]
end
val setupGlobal = string "/* No global setup for LRU cache. */"
(* Bundled up. *)
(* For now, use the toy implementation if there are no arguments. *)
fun toyIfNoKeys numKeys implLru implToy args =
if numKeys args = 0
then implToy args
else implLru args
val cache =
(* let *)
(* val {check = toyCheck, *)
(* store = toyStore, *)
(* flush = toyFlush, *)
(* setupQuery = toySetupQuery, *)
(* ...} = ToyCache.cache *)
(* in *)
(* {check = toyIfNoKeys (length o #2) check toyCheck, *)
(* store = toyIfNoKeys (length o #2) store toyStore, *)
(* flush = toyIfNoKeys (length o #2) flush toyFlush, *)
{check = check, store = store, flush = flush, lock = lock,
setupQuery = setupQuery, setupGlobal = setupGlobal}
(* end *)
end
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