fed-sx-m1: Step 7b — gen_server-per-projection (start_link/3 + async_fold + query) + 11 tests
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@@ -1,6 +1,9 @@
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-module(projection).
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-behaviour(gen_server).
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-export([new/2, new/3, fold_activity/2, replay/2,
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name/1, state/1, fold_fn/1]).
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-export([start_link/3, async_fold/2, query/1, stop/1]).
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2]).
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%% Pure-functional projection driver per design §10.
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%%
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@@ -52,3 +55,43 @@ field(_, []) -> erlang:error(badkey).
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set_field(K, V, [{K, _} | Rest]) -> [{K, V} | Rest];
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set_field(K, V, [P | Rest]) -> [P | set_field(K, V, Rest)];
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set_field(K, V, []) -> [{K, V}].
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%% ── Step 7b: gen_server wrapper ─────────────────────────────────
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%%
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%% Each projection runs in its own gen_server, registered under the
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%% projection's Name atom. `async_fold/2` casts an activity into the
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%% process; `query/1` synchronously fetches the current state.
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%%
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%% Port notes (mirroring Step 5b on the registry): `gen_server:start_link`
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%% returns the raw Pid; `?MODULE` macro is unsupported; spawned
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%% processes don't survive across separate `erlang-eval-ast` calls
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%% so tests must inline start_link with their operations.
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start_link(Name, InitialState, FoldFn) ->
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Pid = gen_server:start_link(projection, [Name, InitialState, FoldFn]),
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erlang:register(Name, Pid),
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Pid.
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async_fold(Name, Activity) ->
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gen_server:cast(Name, {fold, Activity}).
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query(Name) ->
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gen_server:call(Name, get_state).
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stop(Name) ->
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R = gen_server:call(Name, '$gen_stop'),
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erlang:unregister(Name),
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R.
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%% gen_server callbacks
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init([Name, InitialState, FoldFn]) ->
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{ok, new(Name, InitialState, FoldFn)}.
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handle_call(get_state, _From, Proj) ->
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{reply, state(Proj), Proj}.
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handle_cast({fold, Activity}, Proj) ->
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{noreply, fold_activity(Proj, Activity)}.
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handle_info(_, Proj) -> {noreply, Proj}.
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117
next/tests/projection_server.sh
Executable file
117
next/tests/projection_server.sh
Executable file
@@ -0,0 +1,117 @@
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#!/usr/bin/env bash
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# next/tests/projection_server.sh — Step 7b acceptance test.
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#
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# Exercises gen_server-per-projection: start_link/3, async_fold/2,
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# query/1. Each test inlines start_link with operations because
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# the Erlang-on-SX scheduler doesn't preserve processes across
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# separate erlang-eval-ast invocations. 10 cases.
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set -uo pipefail
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cd "$(git rev-parse --show-toplevel)"
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SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
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if [ ! -x "$SX_SERVER" ]; then
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SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
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fi
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if [ ! -x "$SX_SERVER" ]; then
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echo "ERROR: sx_server.exe not found." >&2
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exit 1
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fi
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VERBOSE="${1:-}"
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PASS=0; FAIL=0; ERRORS=""
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TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT
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cat > "$TMPFILE" <<'EPOCHS'
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(epoch 1)
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(load "lib/erlang/tokenizer.sx")
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(load "lib/erlang/parser.sx")
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(load "lib/erlang/parser-core.sx")
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(load "lib/erlang/parser-expr.sx")
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(load "lib/erlang/parser-module.sx")
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(load "lib/erlang/transpile.sx")
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(load "lib/erlang/runtime.sx")
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(load "lib/erlang/vm/dispatcher.sx")
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(epoch 2)
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(eval "(er-load-gen-server!)")
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(epoch 3)
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(eval "(get (erlang-load-module (file-read \"next/kernel/projection.erl\")) :name)")
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;; start_link returns a Pid registered under the given name
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(epoch 10)
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(eval "(get (erlang-eval-ast \"is_pid(projection:start_link(p1, 0, fun (_A, S) -> S + 1 end))\") :name)")
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;; query before any async_fold returns initial state
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(epoch 11)
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(eval "(erlang-eval-ast \"projection:start_link(p1, 0, fun (_A, S) -> S + 1 end), projection:query(p1)\")")
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;; Single async_fold + query returns new state
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(epoch 12)
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(eval "(erlang-eval-ast \"projection:start_link(p1, 0, fun (_A, S) -> S + 1 end), projection:async_fold(p1, a), projection:query(p1)\")")
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;; Five async_folds accumulate
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(epoch 13)
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(eval "(erlang-eval-ast \"projection:start_link(p1, 0, fun (_A, S) -> S + 1 end), projection:async_fold(p1, 1), projection:async_fold(p1, 2), projection:async_fold(p1, 3), projection:async_fold(p1, 4), projection:async_fold(p1, 5), projection:query(p1)\")")
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;; Custom initial state preserved
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(epoch 14)
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(eval "(erlang-eval-ast \"projection:start_link(p1, 42, fun (A, S) -> S + A end), projection:query(p1)\")")
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;; Fold can read the activity (sum activities)
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(epoch 15)
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(eval "(erlang-eval-ast \"projection:start_link(p1, 0, fun (A, S) -> S + A end), projection:async_fold(p1, 10), projection:async_fold(p1, 20), projection:async_fold(p1, 30), projection:query(p1)\")")
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;; List-append fold preserves insertion order (newest-first)
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(epoch 16)
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(eval "(get (erlang-eval-ast \"projection:start_link(p1, [], fun (A, S) -> [A | S] end), projection:async_fold(p1, a), projection:async_fold(p1, b), projection:async_fold(p1, c), projection:query(p1) =:= [c, b, a]\") :name)")
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;; Two named projections are independent
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(epoch 17)
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(eval "(get (erlang-eval-ast \"projection:start_link(p1, 0, fun (_A, S) -> S + 1 end), projection:start_link(p2, [], fun (A, S) -> [A | S] end), projection:async_fold(p1, x), projection:async_fold(p1, y), projection:async_fold(p2, x), {projection:query(p1), projection:query(p2)} =:= {2, [x]}\") :name)")
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;; Conditional fold (filter on activity tag)
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(epoch 18)
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(eval "(erlang-eval-ast \"projection:start_link(p1, 0, fun (A, S) -> case A of {keep, _} -> S + 1; _ -> S end end), projection:async_fold(p1, {keep, a}), projection:async_fold(p1, plain), projection:async_fold(p1, {keep, b}), projection:async_fold(p1, plain), projection:query(p1)\")")
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EPOCHS
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OUTPUT=$(timeout 180 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)
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check() {
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local epoch="$1" desc="$2" expected="$3"
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local actual
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actual=$(echo "$OUTPUT" | awk -v e="$epoch" '
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$0 ~ "^\\(ok-len " e " " { getline; print; exit }
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$0 ~ "^\\(ok " e " " { print; exit }
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$0 ~ "^\\(error " e " " { print; exit }
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')
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[ -z "$actual" ] && actual="<no output for epoch $epoch>"
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if echo "$actual" | grep -qF -- "$expected"; then
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PASS=$((PASS+1))
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[ "$VERBOSE" = "-v" ] && echo " ok $desc"
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else
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FAIL=$((FAIL+1))
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ERRORS+=" FAIL [$desc] (epoch $epoch) expected: $expected | actual: $actual
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"
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fi
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}
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check 2 "gen_server loaded" "gen_server"
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check 3 "projection module loaded" "projection"
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check 10 "start_link returns Pid" "true"
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check 11 "initial state via query" "0"
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check 12 "async_fold + query" "1"
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check 13 "five async_folds accumulate" "5"
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check 14 "custom initial state" "42"
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check 15 "fold reads activity (sum)" "60"
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check 16 "list-append fold order" "true"
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check 17 "two named projections indep." "true"
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check 18 "conditional fold (filter)" "2"
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TOTAL=$((PASS+FAIL))
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if [ $FAIL -eq 0 ]; then
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echo "ok $PASS/$TOTAL next/tests/projection_server.sh passed"
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else
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echo "FAIL $PASS/$TOTAL passed, $FAIL failed:"
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echo "$ERRORS"
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fi
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[ $FAIL -eq 0 ]
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