| %% Copyright (c) 2013, Pedram Nimreezi <deadzen@deadzen.com> |
| %% |
| %% Permission to use, copy, modify, and/or distribute this software for any |
| %% purpose with or without fee is hereby granted, provided that the above |
| %% copyright notice and this permission notice appear in all copies. |
| %% |
| %% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| %% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| %% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| %% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| %% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| %% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| %% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| -module(gr_manager). |
| |
| -behaviour(gen_server). |
| |
| %% API |
| -export([start_link/3, wait_for_pid/1]). |
| |
| %% gen_server callbacks |
| -export([init/1, |
| handle_call/3, |
| handle_cast/2, |
| handle_info/2, |
| terminate/2, |
| code_change/3]). |
| |
| -define(SERVER, ?MODULE). |
| |
| -record(state, {table_id :: ets:tid(), managee :: atom()}). |
| |
| %%%=================================================================== |
| %%% API |
| %%%=================================================================== |
| |
| setup(Name, Data) -> |
| gen_server:cast(Name, {setup, Data}). |
| |
| %%-------------------------------------------------------------------- |
| %% @doc |
| %% Starts the server |
| %% |
| %% @spec start_link() -> {ok, Pid} | ignore | {error, Error} |
| %% @end |
| %%-------------------------------------------------------------------- |
| start_link(Name, Managee, Data) -> |
| gen_server:start_link({local, Name}, ?MODULE, [Managee, Data], []). |
| |
| %%%=================================================================== |
| %%% gen_server callbacks |
| %%%=================================================================== |
| |
| %%-------------------------------------------------------------------- |
| %% @private |
| %% @doc |
| %% Initializes the server |
| %% |
| %% @spec init(Args) -> {ok, State} | |
| %% {ok, State, Timeout} | |
| %% ignore | |
| %% {stop, Reason} |
| %% @end |
| %%-------------------------------------------------------------------- |
| init([Managee, Data]) -> |
| process_flag(trap_exit, true), |
| setup(self(), Data), |
| {ok, #state{managee=Managee}}. |
| |
| %%-------------------------------------------------------------------- |
| %% @private |
| %% @doc |
| %% Handling call messages |
| %% |
| %% @spec handle_call(Request, From, State) -> |
| %% {reply, Reply, State} | |
| %% {reply, Reply, State, Timeout} | |
| %% {noreply, State} | |
| %% {noreply, State, Timeout} | |
| %% {stop, Reason, Reply, State} | |
| %% {stop, Reason, State} |
| %% @end |
| %%-------------------------------------------------------------------- |
| handle_call(_Request, _From, State) -> |
| Reply = {error, unhandled_message}, |
| {reply, Reply, State}. |
| |
| %%-------------------------------------------------------------------- |
| %% @private |
| %% @doc |
| %% Handling cast messages |
| %% |
| %% @spec handle_cast(Msg, State) -> {noreply, State} | |
| %% {noreply, State, Timeout} | |
| %% {stop, Reason, State} |
| %% @end |
| %%-------------------------------------------------------------------- |
| handle_cast({setup, Data}, State = #state{managee=Managee}) -> |
| ManageePid = whereis(Managee), |
| link(ManageePid), |
| TableId = ets:new(?MODULE, [set, private]), |
| ets:insert(TableId, Data), |
| ets:setopts(TableId, {heir, self(), Data}), |
| ets:give_away(TableId, ManageePid, Data), |
| {noreply, State#state{table_id=TableId}}; |
| handle_cast(_Msg, State) -> |
| {noreply, State}. |
| |
| %%-------------------------------------------------------------------- |
| %% @private |
| %% @doc |
| %% Handling all non call/cast messages |
| %% |
| %% @spec handle_info(Info, State) -> {noreply, State} | |
| %% {noreply, State, Timeout} | |
| %% {stop, Reason, State} |
| %% @end |
| %%-------------------------------------------------------------------- |
| handle_info({'EXIT', _Pid, _Reason}, State) -> |
| {noreply, State}; |
| handle_info({'ETS-TRANSFER', TableId, _Pid, Data}, State = #state{managee=Managee}) -> |
| ManageePid = wait_for_pid(Managee), |
| link(ManageePid), |
| ets:give_away(TableId, ManageePid, Data), |
| {noreply, State#state{table_id=TableId}}. |
| |
| wait_for_pid(Managee) when is_atom(Managee), Managee =/= undefined -> |
| case whereis(Managee) of |
| undefined -> |
| timer:sleep(1), |
| wait_for_pid(Managee); |
| ManageePid -> ManageePid |
| end. |
| |
| |
| |
| %%-------------------------------------------------------------------- |
| %% @private |
| %% @doc |
| %% This function is called by a gen_server when it is about to |
| %% terminate. It should be the opposite of Module:init/1 and do any |
| %% necessary cleaning up. When it returns, the gen_server terminates |
| %% with Reason. The return value is ignored. |
| %% |
| %% @spec terminate(Reason, State) -> void() |
| %% @end |
| %%-------------------------------------------------------------------- |
| terminate(_Reason, _State) -> |
| ok. |
| |
| %%-------------------------------------------------------------------- |
| %% @private |
| %% @doc |
| %% Convert process state when code is changed |
| %% |
| %% @spec code_change(OldVsn, State, Extra) -> {ok, NewState} |
| %% @end |
| %%-------------------------------------------------------------------- |
| code_change(_OldVsn, State, _Extra) -> |
| {ok, State}. |
| |
| %%%=================================================================== |
| %%% Internal functions |
| %%%=================================================================== |
| |
| |
| |