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authorJordan Wilberding <[email protected]>2014-10-11 11:52:43 -0500
committerJordan Wilberding <[email protected]>2014-10-11 11:52:43 -0500
commita9c3c235ac81d1a17cf2feb8fbfbd70d6a57edff (patch)
treea17913740b0ad66ceb0139ded8df30514380ece6 /src/rlx_provider.erl
parentd4d197ca142913b81fc192357dff18d1ed266921 (diff)
parentfca419632793346d0f3732ed927f6862ed6bf85a (diff)
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Merge pull request #227 from tsloughter/master
Rebar3 support and code sharing
Diffstat (limited to 'src/rlx_provider.erl')
-rw-r--r--src/rlx_provider.erl117
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diff --git a/src/rlx_provider.erl b/src/rlx_provider.erl
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-%% -*- erlang-indent-level: 4; indent-tabs-mode: nil; fill-column: 80 -*-
-%%% Copyright 2012 Erlware, LLC. All Rights Reserved.
-%%%
-%%% This file is provided to you 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.
-%%%-------------------------------------------------------------------
-%%% @author Eric Merritt <[email protected]>
-%%% @copyright 2011 Erlware, LLC.
-%%% @doc
-%%% A module that supports providing state manipulation services to the system.
-%%% @end
-%%%-------------------------------------------------------------------
--module(rlx_provider).
-
-%% API
--export([new/2,
- do/2,
- impl/1,
- format_error/1,
- format_error/2,
- format/1]).
-
--export_type([t/0]).
-
--include("relx.hrl").
-
-%%%===================================================================
-%%% Types
-%%%===================================================================
-
--opaque t() :: {?MODULE, module()}.
-
-
--ifdef(have_callback_support).
-
--callback init(rlx_state:t()) -> {ok, rlx_state:t()} | relx:error().
--callback do(rlx_state:t()) -> {ok, rlx_state:t()} | relx:error().
--callback format_error(Reason::term()) -> iolist().
-
--else.
-
-%% In the case where R14 or lower is being used to compile the system
-%% we need to export a behaviour info
--export([behaviour_info/1]).
--spec behaviour_info(atom()) -> [{atom(), arity()}] | undefined.
-behaviour_info(callbacks) ->
- [{init, 1},
- {do, 1},
- {format_error, 1}];
-behaviour_info(_) ->
- undefined.
-
--endif.
-
-%%%===================================================================
-%%% API
-%%%===================================================================
-
-%% @doc create a new provider object from the specified module. The
-%% module should implement the provider behaviour.
-%%
-%% @param ModuleName The module name.
-%% @param State0 The current state of the system
--spec new(module(), rlx_state:t()) ->
- {t(), {ok, rlx_state:t()}} | relx:error().
-new(ModuleName, State0) when is_atom(ModuleName) ->
- State1 = ModuleName:init(State0),
- case code:which(ModuleName) of
- non_existing ->
- ?RLX_ERROR({non_existing, ModuleName});
- _ ->
- {{?MODULE, ModuleName}, State1}
- end.
-
-%% @doc Manipulate the state of the system, that new state
-%%
-%% @param Provider the provider object
-%% @param State the current state of the system
--spec do(Provider::t(), rlx_state:t()) ->
- {ok, rlx_state:t()} | relx:error().
-do({?MODULE, Mod}, State) ->
- Mod:do(State).
-
-%%% @doc get the name of the module that implements the provider
-%%% @param Provider the provider object
--spec impl(Provider::t()) -> module().
-impl({?MODULE, Mod}) ->
- Mod.
-
-%% @doc format an error produced from a provider.
--spec format_error(Reason::term()) -> iolist().
-format_error({non_existing, ModuleName}) ->
- io_lib:format("~p does not exist in the system", [ModuleName]).
-
-%% @doc format an error produced from a provider.
--spec format_error(t(), Reason::term()) -> iolist().
-format_error({?MODULE, Mod}, Error) ->
- Mod:format_error(Error).
-
-%% @doc print the provider module name
-%%
-%% @param T - The provider
-%% @return An iolist describing the provider
--spec format(t()) -> iolist().
-format({?MODULE, Mod}) ->
- erlang:atom_to_list(Mod).