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Iterator support

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Add iterator support, used initially only for retrieving bucket
statistics.

The iterator is supported by exporting a function, and when the function
is claled it will take a snapshot of the ledger, run the iterator and
hten close the snapshot.

This required a numbe rof underlying changes, in particular to get key
comparison to work as "expected".  The code had previously misunderstood
how comparison worked between Erlang terms, and in particular did not
account for tuple length being compared first by size of the tuple (and
not just by each element in order).
This commit is contained in:
martinsumner 2016-10-12 17:12:49 +01:00
parent d2cc07a9eb
commit 0a08867280
6 changed files with 762 additions and 202 deletions
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4
src/leveled_pclerk.erl
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@ -100,6 +100,7 @@ init([]) ->
handle_call({register, Owner}, _From, State) ->
{reply, ok, State#state{owner=Owner}, ?INACTIVITY_TIMEOUT};
handle_call({manifest_change, return, true}, _From, State) ->
io:format("Request for manifest change from clerk on closing~n"),
case State#state.change_pending of
true ->
WI = State#state.work_item,
@ -110,11 +111,13 @@ handle_call({manifest_change, return, true}, _From, State) ->
handle_call({manifest_change, confirm, Closing}, From, State) ->
case Closing of
true ->
io:format("Confirmation of manifest change on closing~n"),
WI = State#state.work_item,
ok = mark_for_delete(WI#penciller_work.unreferenced_files,
State#state.owner),
{stop, normal, ok, State};
false ->
io:format("Prompted confirmation of manifest change~n"),
gen_server:reply(From, ok),
WI = State#state.work_item,
mark_for_delete(WI#penciller_work.unreferenced_files,
@ -168,6 +171,7 @@ requestandhandle_work(State) ->
{NewManifest, FilesToDelete} = merge(WI),
UpdWI = WI#penciller_work{new_manifest=NewManifest,
unreferenced_files=FilesToDelete},
io:format("Clerk prompting Penciller regarding manifest change~n"),
ok = leveled_penciller:pcl_promptmanifestchange(State#state.owner,
UpdWI),
{true, UpdWI}