ARI: Implement device state API

Created a data model and implemented functionality for an ARI device state
resource.  The following operations have been added that allow a user to
manipulate an ARI controlled device:

Create/Change the state of an ARI controlled device
PUT    /deviceStates/{deviceName}&{deviceState}

Retrieve all ARI controlled devices
GET    /deviceStates

Retrieve the current state of a device
GET    /deviceStates/{deviceName}

Destroy a device-state controlled by ARI
DELETE /deviceStates/{deviceName}

The ARI controlled device must begin with 'Stasis:'.  An example controlled
device name would be Stasis:Example.  A 'DeviceStateChanged' event has also
been added so that an application can subscribe and receive device change
events.  Any device state, ARI controlled or not, can be subscribed to.

While adding the event, the underlying subscription control mechanism was
refactored so that all current and future resource subscriptions would be
the same.  Each event resource must now register itself in order to be able
to properly handle [un]subscribes.

(issue ASTERISK-22838)
Reported by: Matt Jordan
Review: https://reviewboard.asterisk.org/r/3025/
........

Merged revisions 403134 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@403135 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 16 insertions, 0 deletions

diff --git a/main/devicestate.c b/main/devicestate.c
index 158d1f817..7b52f00af 100644
--- a/main/devicestate.c
+++ b/main/devicestate.c
@@ -734,6 +734,22 @@ struct stasis_topic *ast_device_state_topic(const char *device)
 	return stasis_topic_pool_get_topic(device_state_topic_pool, device);
 }
 
+int ast_device_state_clear_cache(const char *device)
+{
+	RAII_VAR(struct stasis_message *, cached_msg, NULL, ao2_cleanup);
+	RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
+
+	if (!(cached_msg = stasis_cache_get(ast_device_state_cache(),
+					    ast_device_state_message_type(), device))) {
+		/* nothing to clear */
+		return -1;
+	}
+
+	msg = stasis_cache_clear_create(cached_msg);
+	stasis_publish(ast_device_state_topic(device), msg);
+	return 0;
+}
+
 int ast_publish_device_state_full(
 			const char *device,
 			enum ast_device_state state,