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authorserge <[email protected]>2013-01-10 09:07:38 -0500
committerSerge Aleynikov <[email protected]>2013-01-14 13:24:41 -0500
commitd1d834820ddaba4fa31e6ab6d07a96ac7cc6d999 (patch)
tree9dd256e5390bc9845cfd1ccb094845a904bbb911 /lib
parent9f461fbaf0be7aba7c0b8b89be1f0b6f1141b7a5 (diff)
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Add application:get_key/3
The new function provides a default value for a configuration parameter.
Diffstat (limited to 'lib')
-rw-r--r--lib/kernel/doc/src/application.xml4
-rw-r--r--lib/kernel/src/application.erl16
-rw-r--r--lib/kernel/test/application_SUITE.erl13
3 files changed, 29 insertions, 4 deletions
diff --git a/lib/kernel/doc/src/application.xml b/lib/kernel/doc/src/application.xml
index 51a3311ec2..3513e2b592 100644
--- a/lib/kernel/doc/src/application.xml
+++ b/lib/kernel/doc/src/application.xml
@@ -108,12 +108,14 @@
<func>
<name name="get_env" arity="1"/>
<name name="get_env" arity="2"/>
+ <name name="get_env" arity="3"/>
<fsummary>Get the value of a configuration parameter</fsummary>
<desc>
<p>Returns the value of the configuration parameter <c><anno>Par</anno></c>
for <c><anno>Application</anno></c>. If the application argument is
omitted, it defaults to the application of the calling
- process.</p>
+ process. If <c><anno>Def</anno></c> value is provided, it is returned
+ when no configuration parameter <c><anno>Par</anno></c> is defined.</p>
<p>If the specified application is not loaded, or
the configuration parameter does not exist, or if the process
executing the call does not belong to any application,
diff --git a/lib/kernel/src/application.erl b/lib/kernel/src/application.erl
index 9b7c4aa7b8..4e65883be7 100644
--- a/lib/kernel/src/application.erl
+++ b/lib/kernel/src/application.erl
@@ -23,7 +23,7 @@
which_applications/0, which_applications/1,
loaded_applications/0, permit/2]).
-export([set_env/3, set_env/4, unset_env/2, unset_env/3]).
--export([get_env/1, get_env/2, get_all_env/0, get_all_env/1]).
+-export([get_env/1, get_env/2, get_env/3, get_all_env/0, get_all_env/1]).
-export([get_key/1, get_key/2, get_all_key/0, get_all_key/1]).
-export([get_application/0, get_application/1, info/0]).
-export([start_type/0]).
@@ -264,6 +264,20 @@ get_env(Key) ->
get_env(Application, Key) ->
application_controller:get_env(Application, Key).
+-spec get_env(Application, Par, Def) -> Val when
+ Application :: atom(),
+ Par :: atom(),
+ Def :: term(),
+ Val :: term().
+
+get_env(Application, Key, Def) ->
+ case get_env(Application, Key) of
+ {ok, Val} ->
+ Val;
+ undefined ->
+ Def
+ end.
+
-spec get_all_env() -> Env when
Env :: [{Par :: atom(), Val :: term()}].
diff --git a/lib/kernel/test/application_SUITE.erl b/lib/kernel/test/application_SUITE.erl
index f469a0af98..412a969b13 100644
--- a/lib/kernel/test/application_SUITE.erl
+++ b/lib/kernel/test/application_SUITE.erl
@@ -27,7 +27,7 @@
otp_1586/1, otp_2078/1, otp_2012/1, otp_2718/1, otp_2973/1,
otp_3002/1, otp_3184/1, otp_4066/1, otp_4227/1, otp_5363/1,
otp_5606/1,
- start_phases/1, get_key/1,
+ start_phases/1, get_key/1, get_env/1,
permit_false_start_local/1, permit_false_start_dist/1, script_start/1,
nodedown_start/1, init2973/0, loop2973/0, loop5606/1]).
@@ -49,7 +49,7 @@ all() ->
[failover, failover_comp, permissions, load,
load_use_cache, {group, reported_bugs}, start_phases,
script_start, nodedown_start, permit_false_start_local,
- permit_false_start_dist, get_key,
+ permit_false_start_dist, get_key, get_env,
{group, distr_changed}, config_change, shutdown_func, shutdown_timeout].
groups() ->
@@ -1503,6 +1503,15 @@ loop5606(Pid) ->
Pid ! {self(), Res}
end.
+get_env(suite) -> [];
+get_env(doc) ->
+ ["Tests get_env/* functions"];
+get_env(Conf) when is_list(Conf) ->
+ ?line {ok, _} = application:get_env(kernel, error_logger),
+ ?line undefined = application:get_env(undefined_app, a),
+ ?line undefined = application:get_env(kernel, error_logger_xyz),
+ ?line default = application:get_env(kernel, error_logger_xyz, default),
+ ok.
%%-----------------------------------------------------------------
%% Should be started in a CC view with: