author | boehmes |
Wed, 24 Mar 2010 09:43:34 +0100 | |
changeset 35942 | 667fd8553cd5 |
parent 35941 | 63f0d628edff |
child 36086 | 8e5454761f26 |
permissions | -rw-r--r-- |
35942
667fd8553cd5
use internal SHA1 digest implementation for generating hash keys
boehmes
parents:
35941
diff
changeset
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(* Title: Tools/cache_io.ML |
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Author: Sascha Boehme, TU Muenchen |
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Cache for output of external processes. |
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*) |
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signature CACHE_IO = |
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sig |
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val with_tmp_file: string -> (Path.T -> 'a) -> 'a |
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val run: (Path.T -> string) -> Path.T -> string list |
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val run': (Path.T -> Path.T -> string) -> Path.T -> string list * string list |
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type cache |
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val make: Path.T -> cache |
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val cache_path_of: cache -> Path.T |
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val cached: cache -> (Path.T -> string) -> Path.T -> string list |
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val cached': cache -> (Path.T -> Path.T -> string) -> Path.T -> |
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string list * string list |
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end |
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structure Cache_IO : CACHE_IO = |
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struct |
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fun with_tmp_file name f = |
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let |
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val path = File.tmp_path (Path.explode (name ^ serial_string ())) |
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val x = Exn.capture f path |
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val _ = try File.rm path |
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in Exn.release x end |
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fun run' make_cmd in_path = |
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with_tmp_file "cache-io-" (fn out_path => |
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let |
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val (out2, _) = bash_output (make_cmd in_path out_path) |
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val out1 = the_default [] (try (rev o File.fold_lines cons out_path) []) |
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in (out1, split_lines out2) end) |
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fun run make_cmd = snd o run' (fn in_path => fn _ => make_cmd in_path) |
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abstype cache = Cache of { |
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path: Path.T, |
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table: (int * (int * int * int) Symtab.table) Synchronized.var } |
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with |
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fun cache_path_of (Cache {path, ...}) = path |
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fun load cache_path = |
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let |
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fun err () = error ("Cache IO: corrupted cache file: " ^ |
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File.shell_path cache_path) |
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fun int_of_string s = |
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(case read_int (explode s) of |
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(i, []) => i |
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| _ => err ()) |
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fun split line = |
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(case space_explode " " line of |
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[key, len1, len2] => (key, int_of_string len1, int_of_string len2) |
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| _ => err ()) |
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fun parse line ((i, l), tab) = |
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if i = l |
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then |
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let val (key, l1, l2) = split line |
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in ((i+1, l+l1+l2+1), Symtab.update (key, (i+1, l1, l2)) tab) end |
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else ((i+1, l), tab) |
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in apfst fst (File.fold_lines parse cache_path ((1, 1), Symtab.empty)) end |
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fun make path = |
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let val table = if File.exists path then load path else (1, Symtab.empty) |
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in Cache {path=path, table=Synchronized.var (Path.implode path) table} end |
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fun load_cached_result cache_path (p, len1, len2) = |
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let |
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fun load line (i, xsp) = |
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if i < p then (i+1, xsp) |
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else if i < p + len1 then (i+1, apfst (cons line) xsp) |
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else if i < p + len2 then (i+1, apsnd (cons line) xsp) |
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else (i, xsp) |
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in pairself rev (snd (File.fold_lines load cache_path (1, ([], [])))) end |
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fun cached' (Cache {path=cache_path, table}) make_cmd in_path = |
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35942
667fd8553cd5
use internal SHA1 digest implementation for generating hash keys
boehmes
parents:
35941
diff
changeset
|
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let val key = SHA1.digest (File.read in_path) |
35151 | 90 |
in |
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(case Symtab.lookup (snd (Synchronized.value table)) key of |
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SOME pos => load_cached_result cache_path pos |
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| NONE => |
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let |
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val res as (out, err) = run' make_cmd in_path |
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val (l1, l2) = pairself length res |
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val header = key ^ " " ^ string_of_int l1 ^ " " ^ string_of_int l2 |
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val lines = map (suffix "\n") (header :: out @ err) |
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val _ = Synchronized.change table (fn (p, tab) => |
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if Symtab.defined tab key then (p, tab) |
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else |
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let val _ = File.append_list cache_path lines |
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in (p+l1+l2+1, Symtab.update (key, (p+1, l1, l2)) tab) end) |
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in res end) |
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end |
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fun cached cache make_cmd = |
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snd o cached' cache (fn in_path => fn _ => make_cmd in_path) |
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end |
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end |