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-rw-r--r--apps/rexi/src/rexi_server.erl100
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diff --git a/apps/rexi/src/rexi_server.erl b/apps/rexi/src/rexi_server.erl
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--- a/apps/rexi/src/rexi_server.erl
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-% Copyright 2010 Cloudant
-%
-% Licensed under the Apache License, Version 2.0 (the "License"); you may not
-% use this file except in compliance with the License. You may obtain a copy of
-% the License at
-%
-% http://www.apache.org/licenses/LICENSE-2.0
-%
-% Unless required by applicable law or agreed to in writing, software
-% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-% License for the specific language governing permissions and limitations under
-% the License.
-
--module(rexi_server).
--behaviour(gen_server).
--export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2,
- code_change/3]).
-
--export([start_link/0, init_p/2]).
-
--include_lib("eunit/include/eunit.hrl").
-
--record(st, {
- workers = ets:new(workers, [private, {keypos,2}])
-}).
-
-start_link() ->
- gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
-
-init([]) ->
- {ok, #st{}}.
-
-handle_call(_Request, _From, St) ->
- {reply, ignored, St}.
-
-handle_cast({doit, From, MFA}, #st{workers=Workers} = St) ->
- {LocalPid, Ref} = spawn_monitor(?MODULE, init_p, [From, MFA]),
- {noreply, St#st{workers = add_worker({LocalPid, Ref, From}, Workers)}};
-
-handle_cast({kill, FromRef}, #st{workers=Workers} = St) ->
- case find_worker_from(FromRef, Workers) of
- {Pid, KeyRef, {_, FromRef}} ->
- erlang:demonitor(KeyRef),
- exit(Pid, kill),
- {noreply, St#st{workers = remove_worker(KeyRef, Workers)}};
- false ->
- {noreply, St}
- end.
-
-handle_info({'DOWN', Ref, process, _, normal}, #st{workers=Workers} = St) ->
- {noreply, St#st{workers = remove_worker(Ref, Workers)}};
-
-handle_info({'DOWN', Ref, process, Pid, Reason}, #st{workers=Workers} = St) ->
- case find_worker(Ref, Workers) of
- {Pid, Ref, From} ->
- notify_caller(From, Reason),
- {noreply, St#st{workers = remove_worker(Ref, Workers)}};
- false ->
- {noreply, St}
- end;
-
-handle_info(_Info, St) ->
- {noreply, St}.
-
-terminate(_Reason, St) ->
- ets:foldl(fun({Pid, _, _}, _) -> exit(Pid,kill) end, nil, St#st.workers),
- ok.
-
-code_change(_OldVsn, St, _Extra) ->
- {ok, St}.
-
-%% @doc initializes a process started by rexi_server.
--spec init_p({pid(), reference()}, {atom(), atom(), list()}) -> any().
-init_p(From, {M,F,A}) ->
- put(rexi_from, From),
- put(initial_call, {M,F,length(A)}),
- try apply(M, F, A) catch _:Reason -> exit(Reason) end.
-
-%% internal
-
-add_worker(Worker, Tab) ->
- ets:insert(Tab, Worker), Tab.
-
-remove_worker(Ref, Tab) ->
- ets:delete(Tab, Ref), Tab.
-
-find_worker(Ref, Tab) ->
- case ets:lookup(Tab, Ref) of [] -> false; [Worker] -> Worker end.
-
-find_worker_from(Ref, Tab) ->
- case ets:match_object(Tab, {'_', '_', {'_', Ref}}) of
- [] ->
- false;
- [Worker] ->
- Worker
- end.
-
-notify_caller({Caller, Ref}, Reason) ->
- Caller ! {Ref, {rexi_EXIT, Reason}}.