Merge "stasis: No need to keep a stasis type ref in a stasis msg or cache object."
[asterisk/asterisk.git] / main / stasis.c
index 0a5db2f..1616deb 100644 (file)
 
 #include "asterisk.h"
 
-ASTERISK_FILE_VERSION(__FILE__, "$Revision$");
-
 #include "asterisk/astobj2.h"
 #include "asterisk/stasis_internal.h"
 #include "asterisk/stasis.h"
 #include "asterisk/taskprocessor.h"
+#include "asterisk/threadpool.h"
 #include "asterisk/utils.h"
 #include "asterisk/uuid.h"
 #include "asterisk/vector.h"
+#include "asterisk/stasis_channels.h"
+#include "asterisk/stasis_bridges.h"
+#include "asterisk/stasis_endpoints.h"
+#include "asterisk/config_options.h"
+
+/*** DOCUMENTATION
+       <managerEvent language="en_US" name="UserEvent">
+               <managerEventInstance class="EVENT_FLAG_USER">
+                       <synopsis>A user defined event raised from the dialplan.</synopsis>
+                       <syntax>
+                               <channel_snapshot/>
+                               <parameter name="UserEvent">
+                                       <para>The event name, as specified in the dialplan.</para>
+                               </parameter>
+                       </syntax>
+                       <description>
+                               <para>Event may contain additional arbitrary parameters in addition to optional bridge and endpoint snapshots.  Multiple snapshots of the same type are prefixed with a numeric value.</para>
+                       </description>
+                       <see-also>
+                               <ref type="application">UserEvent</ref>
+                               <ref type="managerEvent">UserEvent</ref>
+                       </see-also>
+               </managerEventInstance>
+       </managerEvent>
+       <configInfo name="stasis" language="en_US">
+               <configFile name="stasis.conf">
+                       <configObject name="threadpool">
+                               <synopsis>Settings that configure the threadpool Stasis uses to deliver some messages.</synopsis>
+                               <configOption name="initial_size" default="5">
+                                       <synopsis>Initial number of threads in the message bus threadpool.</synopsis>
+                               </configOption>
+                               <configOption name="idle_timeout_sec" default="20">
+                                       <synopsis>Number of seconds before an idle thread is disposed of.</synopsis>
+                               </configOption>
+                               <configOption name="max_size" default="50">
+                                       <synopsis>Maximum number of threads in the threadpool.</synopsis>
+                               </configOption>
+                       </configObject>
+                       <configObject name="declined_message_types">
+                               <synopsis>Stasis message types for which to decline creation.</synopsis>
+                               <configOption name="decline">
+                                       <synopsis>The message type to decline.</synopsis>
+                                       <description>
+                                               <para>This configuration option defines the name of the Stasis
+                                               message type that Asterisk is forbidden from creating and can be
+                                               specified as many times as necessary to achieve the desired result.</para>
+                                               <enumlist>
+                                                       <enum name="stasis_app_recording_snapshot_type" />
+                                                       <enum name="stasis_app_playback_snapshot_type" />
+                                                       <enum name="stasis_test_message_type" />
+                                                       <enum name="confbridge_start_type" />
+                                                       <enum name="confbridge_end_type" />
+                                                       <enum name="confbridge_join_type" />
+                                                       <enum name="confbridge_leave_type" />
+                                                       <enum name="confbridge_start_record_type" />
+                                                       <enum name="confbridge_stop_record_type" />
+                                                       <enum name="confbridge_mute_type" />
+                                                       <enum name="confbridge_unmute_type" />
+                                                       <enum name="confbridge_talking_type" />
+                                                       <enum name="cel_generic_type" />
+                                                       <enum name="ast_bridge_snapshot_type" />
+                                                       <enum name="ast_bridge_merge_message_type" />
+                                                       <enum name="ast_channel_entered_bridge_type" />
+                                                       <enum name="ast_channel_left_bridge_type" />
+                                                       <enum name="ast_blind_transfer_type" />
+                                                       <enum name="ast_attended_transfer_type" />
+                                                       <enum name="ast_endpoint_snapshot_type" />
+                                                       <enum name="ast_endpoint_state_type" />
+                                                       <enum name="ast_device_state_message_type" />
+                                                       <enum name="ast_test_suite_message_type" />
+                                                       <enum name="ast_mwi_state_type" />
+                                                       <enum name="ast_mwi_vm_app_type" />
+                                                       <enum name="ast_format_register_type" />
+                                                       <enum name="ast_format_unregister_type" />
+                                                       <enum name="ast_manager_get_generic_type" />
+                                                       <enum name="ast_parked_call_type" />
+                                                       <enum name="ast_channel_snapshot_type" />
+                                                       <enum name="ast_channel_dial_type" />
+                                                       <enum name="ast_channel_varset_type" />
+                                                       <enum name="ast_channel_hangup_request_type" />
+                                                       <enum name="ast_channel_dtmf_begin_type" />
+                                                       <enum name="ast_channel_dtmf_end_type" />
+                                                       <enum name="ast_channel_hold_type" />
+                                                       <enum name="ast_channel_unhold_type" />
+                                                       <enum name="ast_channel_chanspy_start_type" />
+                                                       <enum name="ast_channel_chanspy_stop_type" />
+                                                       <enum name="ast_channel_fax_type" />
+                                                       <enum name="ast_channel_hangup_handler_type" />
+                                                       <enum name="ast_channel_moh_start_type" />
+                                                       <enum name="ast_channel_moh_stop_type" />
+                                                       <enum name="ast_channel_monitor_start_type" />
+                                                       <enum name="ast_channel_monitor_stop_type" />
+                                                       <enum name="ast_channel_agent_login_type" />
+                                                       <enum name="ast_channel_agent_logoff_type" />
+                                                       <enum name="ast_channel_talking_start" />
+                                                       <enum name="ast_channel_talking_stop" />
+                                                       <enum name="ast_security_event_type" />
+                                                       <enum name="ast_named_acl_change_type" />
+                                                       <enum name="ast_local_bridge_type" />
+                                                       <enum name="ast_local_optimization_begin_type" />
+                                                       <enum name="ast_local_optimization_end_type" />
+                                                       <enum name="stasis_subscription_change_type" />
+                                                       <enum name="ast_multi_user_event_type" />
+                                                       <enum name="stasis_cache_clear_type" />
+                                                       <enum name="stasis_cache_update_type" />
+                                                       <enum name="ast_network_change_type" />
+                                                       <enum name="ast_system_registry_type" />
+                                                       <enum name="ast_cc_available_type" />
+                                                       <enum name="ast_cc_offertimerstart_type" />
+                                                       <enum name="ast_cc_requested_type" />
+                                                       <enum name="ast_cc_requestacknowledged_type" />
+                                                       <enum name="ast_cc_callerstopmonitoring_type" />
+                                                       <enum name="ast_cc_callerstartmonitoring_type" />
+                                                       <enum name="ast_cc_callerrecalling_type" />
+                                                       <enum name="ast_cc_recallcomplete_type" />
+                                                       <enum name="ast_cc_failure_type" />
+                                                       <enum name="ast_cc_monitorfailed_type" />
+                                                       <enum name="ast_presence_state_message_type" />
+                                                       <enum name="ast_rtp_rtcp_sent_type" />
+                                                       <enum name="ast_rtp_rtcp_received_type" />
+                                                       <enum name="ast_call_pickup_type" />
+                                                       <enum name="aoc_s_type" />
+                                                       <enum name="aoc_d_type" />
+                                                       <enum name="aoc_e_type" />
+                                                       <enum name="dahdichannel_type" />
+                                                       <enum name="mcid_type" />
+                                                       <enum name="session_timeout_type" />
+                                                       <enum name="cdr_read_message_type" />
+                                                       <enum name="cdr_write_message_type" />
+                                                       <enum name="cdr_prop_write_message_type" />
+                                                       <enum name="corosync_ping_message_type" />
+                                                       <enum name="agi_exec_start_type" />
+                                                       <enum name="agi_exec_end_type" />
+                                                       <enum name="agi_async_start_type" />
+                                                       <enum name="agi_async_exec_type" />
+                                                       <enum name="agi_async_end_type" />
+                                                       <enum name="queue_caller_join_type" />
+                                                       <enum name="queue_caller_leave_type" />
+                                                       <enum name="queue_caller_abandon_type" />
+                                                       <enum name="queue_member_status_type" />
+                                                       <enum name="queue_member_added_type" />
+                                                       <enum name="queue_member_removed_type" />
+                                                       <enum name="queue_member_pause_type" />
+                                                       <enum name="queue_member_penalty_type" />
+                                                       <enum name="queue_member_ringinuse_type" />
+                                                       <enum name="queue_agent_called_type" />
+                                                       <enum name="queue_agent_connect_type" />
+                                                       <enum name="queue_agent_complete_type" />
+                                                       <enum name="queue_agent_dump_type" />
+                                                       <enum name="queue_agent_ringnoanswer_type" />
+                                                       <enum name="meetme_join_type" />
+                                                       <enum name="meetme_leave_type" />
+                                                       <enum name="meetme_end_type" />
+                                                       <enum name="meetme_mute_type" />
+                                                       <enum name="meetme_talking_type" />
+                                                       <enum name="meetme_talk_request_type" />
+                                                       <enum name="appcdr_message_type" />
+                                                       <enum name="forkcdr_message_type" />
+                                                       <enum name="cdr_sync_message_type" />
+                                               </enumlist>
+                                       </description>
+                               </configOption>
+                       </configObject>
+               </configFile>
+       </configInfo>
+***/
 
 /*!
  * \page stasis-impl Stasis Implementation Notes
@@ -134,6 +299,9 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$");
 /*! The number of buckets to use for topic pools */
 #define TOPIC_POOL_BUCKETS 57
 
+/*! Thread pool for topics that don't want a dedicated taskprocessor */
+static struct ast_threadpool *pool;
+
 STASIS_MESSAGE_TYPE_DEFN(stasis_subscription_change_type);
 
 /*! \internal */
@@ -178,28 +346,22 @@ static void topic_dtor(void *obj)
 
 struct stasis_topic *stasis_topic_create(const char *name)
 {
-       RAII_VAR(struct stasis_topic *, topic, NULL, ao2_cleanup);
+       struct stasis_topic *topic;
        int res = 0;
 
-       topic = ao2_alloc(sizeof(*topic), topic_dtor);
-
+       topic = ao2_t_alloc(sizeof(*topic), topic_dtor, name);
        if (!topic) {
                return NULL;
        }
 
        topic->name = ast_strdup(name);
-       if (!topic->name) {
-               return NULL;
-       }
-
        res |= AST_VECTOR_INIT(&topic->subscribers, INITIAL_SUBSCRIBERS_MAX);
        res |= AST_VECTOR_INIT(&topic->upstream_topics, 0);
-
-       if (res != 0) {
+       if (!topic->name || res) {
+               ao2_cleanup(topic);
                return NULL;
        }
 
-       ao2_ref(topic, +1);
        return topic;
 }
 
@@ -221,8 +383,6 @@ struct stasis_subscription {
        /*! Data pointer to be handed to the callback. */
        void *data;
 
-       /*! Lock for completion flags \c final_message_{rxed,processed}. */
-       ast_mutex_t join_lock;
        /*! Condition for joining with subscription. */
        ast_cond_t join_cond;
        /*! Flag set when final message for sub has been received.
@@ -248,7 +408,6 @@ static void subscription_dtor(void *obj)
        sub->topic = NULL;
        ast_taskprocessor_unreference(sub->mailbox);
        sub->mailbox = NULL;
-       ast_mutex_destroy(&sub->join_lock);
        ast_cond_destroy(&sub->join_cond);
 }
 
@@ -263,9 +422,10 @@ static void subscription_invoke(struct stasis_subscription *sub,
 {
        /* Notify that the final message has been received */
        if (stasis_subscription_final_message(sub, message)) {
-               SCOPED_MUTEX(lock, &sub->join_lock);
+               ao2_lock(sub);
                sub->final_message_rxed = 1;
                ast_cond_signal(&sub->join_cond);
+               ao2_unlock(sub);
        }
 
        /* Since sub is mostly immutable, no need to lock sub */
@@ -273,45 +433,61 @@ static void subscription_invoke(struct stasis_subscription *sub,
 
        /* Notify that the final message has been processed */
        if (stasis_subscription_final_message(sub, message)) {
-               SCOPED_MUTEX(lock, &sub->join_lock);
+               ao2_lock(sub);
                sub->final_message_processed = 1;
                ast_cond_signal(&sub->join_cond);
+               ao2_unlock(sub);
        }
 }
 
 static void send_subscription_subscribe(struct stasis_topic *topic, struct stasis_subscription *sub);
 static void send_subscription_unsubscribe(struct stasis_topic *topic, struct stasis_subscription *sub);
 
+void stasis_subscription_cb_noop(void *data, struct stasis_subscription *sub, struct stasis_message *message)
+{
+}
+
 struct stasis_subscription *internal_stasis_subscribe(
        struct stasis_topic *topic,
        stasis_subscription_cb callback,
        void *data,
-       int needs_mailbox)
+       int needs_mailbox,
+       int use_thread_pool)
 {
-       RAII_VAR(struct stasis_subscription *, sub, NULL, ao2_cleanup);
+       struct stasis_subscription *sub;
 
        if (!topic) {
                return NULL;
        }
 
-       sub = ao2_alloc(sizeof(*sub), subscription_dtor);
+       /* The ao2 lock is used for join_cond. */
+       sub = ao2_t_alloc(sizeof(*sub), subscription_dtor, stasis_topic_name(topic));
        if (!sub) {
                return NULL;
        }
-
        ast_uuid_generate_str(sub->uniqueid, sizeof(sub->uniqueid));
 
        if (needs_mailbox) {
-               /* With a small number of subscribers, a thread-per-sub is
-                * acceptable. If our usage changes so that we have larger
-                * numbers of subscribers, we'll probably want to consider
-                * a threadpool. We had that originally, but with so few
-                * subscribers it was actually a performance loss instead of
-                * a gain.
+               char tps_name[AST_TASKPROCESSOR_MAX_NAME + 1];
+
+               /* Create name with seq number appended. */
+               ast_taskprocessor_build_name(tps_name, sizeof(tps_name), "sub%c:%s",
+                       use_thread_pool ? 'p' : 'm',
+                       stasis_topic_name(topic));
+
+               /*
+                * With a small number of subscribers, a thread-per-sub is
+                * acceptable. For a large number of subscribers, a thread
+                * pool should be used.
                 */
-               sub->mailbox = ast_taskprocessor_get(sub->uniqueid,
-                       TPS_REF_DEFAULT);
+               if (use_thread_pool) {
+                       sub->mailbox = ast_threadpool_serializer(tps_name, pool);
+               } else {
+                       sub->mailbox = ast_taskprocessor_get(tps_name, TPS_REF_DEFAULT);
+               }
                if (!sub->mailbox) {
+                       ao2_ref(sub, -1);
+
                        return NULL;
                }
                ast_taskprocessor_set_local(sub->mailbox, sub);
@@ -323,15 +499,15 @@ struct stasis_subscription *internal_stasis_subscribe(
        sub->topic = topic;
        sub->callback = callback;
        sub->data = data;
-       ast_mutex_init(&sub->join_lock);
        ast_cond_init(&sub->join_cond, NULL);
 
        if (topic_add_subscription(topic, sub) != 0) {
+               ao2_ref(sub, -1);
+
                return NULL;
        }
        send_subscription_subscribe(topic, sub);
 
-       ao2_ref(sub, +1);
        return sub;
 }
 
@@ -340,7 +516,15 @@ struct stasis_subscription *stasis_subscribe(
        stasis_subscription_cb callback,
        void *data)
 {
-       return internal_stasis_subscribe(topic, callback, data, 1);
+       return internal_stasis_subscribe(topic, callback, data, 1, 0);
+}
+
+struct stasis_subscription *stasis_subscribe_pool(
+       struct stasis_topic *topic,
+       stasis_subscription_cb callback,
+       void *data)
+{
+       return internal_stasis_subscribe(topic, callback, data, 1, 1);
 }
 
 static int sub_cleanup(void *data)
@@ -354,18 +538,21 @@ struct stasis_subscription *stasis_unsubscribe(struct stasis_subscription *sub)
 {
        /* The subscription may be the last ref to this topic. Hold
         * the topic ref open until after the unlock. */
-       RAII_VAR(struct stasis_topic *, topic,
-               ao2_bump(sub ? sub->topic : NULL), ao2_cleanup);
+       struct stasis_topic *topic;
 
        if (!sub) {
                return NULL;
        }
 
+       topic = ao2_bump(sub->topic);
+
        /* We have to remove the subscription first, to ensure the unsubscribe
         * is the final message */
        if (topic_remove_subscription(sub->topic, sub) != 0) {
                ast_log(LOG_ERROR,
                        "Internal error: subscription has invalid topic\n");
+               ao2_cleanup(topic);
+
                return NULL;
        }
 
@@ -379,26 +566,46 @@ struct stasis_subscription *stasis_unsubscribe(struct stasis_subscription *sub)
 
        /* Unsubscribing unrefs the subscription */
        ao2_cleanup(sub);
+       ao2_cleanup(topic);
+
        return NULL;
 }
 
+int stasis_subscription_set_congestion_limits(struct stasis_subscription *subscription,
+       long low_water, long high_water)
+{
+       int res = -1;
+
+       if (subscription) {
+               res = ast_taskprocessor_alert_set_levels(subscription->mailbox,
+                       low_water, high_water);
+       }
+       return res;
+}
+
 void stasis_subscription_join(struct stasis_subscription *subscription)
 {
        if (subscription) {
-               SCOPED_MUTEX(lock, &subscription->join_lock);
+               ao2_lock(subscription);
                /* Wait until the processed flag has been set */
                while (!subscription->final_message_processed) {
                        ast_cond_wait(&subscription->join_cond,
-                               &subscription->join_lock);
+                               ao2_object_get_lockaddr(subscription));
                }
+               ao2_unlock(subscription);
        }
 }
 
 int stasis_subscription_is_done(struct stasis_subscription *subscription)
 {
        if (subscription) {
-               SCOPED_MUTEX(lock, &subscription->join_lock);
-               return subscription->final_message_rxed;
+               int ret;
+
+               ao2_lock(subscription);
+               ret = subscription->final_message_rxed;
+               ao2_unlock(subscription);
+
+               return ret;
        }
 
        /* Null subscription is about as done as you can get */
@@ -426,13 +633,15 @@ int stasis_subscription_is_subscribed(const struct stasis_subscription *sub)
        if (sub) {
                size_t i;
                struct stasis_topic *topic = sub->topic;
-               SCOPED_AO2LOCK(lock_topic, topic);
 
+               ao2_lock(topic);
                for (i = 0; i < AST_VECTOR_SIZE(&topic->subscribers); ++i) {
                        if (AST_VECTOR_GET(&topic->subscribers, i) == sub) {
+                               ao2_unlock(topic);
                                return 1;
                        }
                }
+               ao2_unlock(topic);
        }
 
        return 0;
@@ -446,6 +655,7 @@ const char *stasis_subscription_uniqueid(const struct stasis_subscription *sub)
 int stasis_subscription_final_message(struct stasis_subscription *sub, struct stasis_message *msg)
 {
        struct stasis_subscription_change *change;
+
        if (stasis_message_type(msg) != stasis_subscription_change_type()) {
                return 0;
        }
@@ -472,8 +682,8 @@ int stasis_subscription_final_message(struct stasis_subscription *sub, struct st
 static int topic_add_subscription(struct stasis_topic *topic, struct stasis_subscription *sub)
 {
        size_t idx;
-       SCOPED_AO2LOCK(lock, topic);
 
+       ao2_lock(topic);
        /* The reference from the topic to the subscription is shared with
         * the owner of the subscription, which will explicitly unsubscribe
         * to release it.
@@ -486,6 +696,7 @@ static int topic_add_subscription(struct stasis_topic *topic, struct stasis_subs
                topic_add_subscription(
                        AST_VECTOR_GET(&topic->upstream_topics, idx), sub);
        }
+       ao2_unlock(topic);
 
        return 0;
 }
@@ -493,15 +704,18 @@ static int topic_add_subscription(struct stasis_topic *topic, struct stasis_subs
 static int topic_remove_subscription(struct stasis_topic *topic, struct stasis_subscription *sub)
 {
        size_t idx;
-       SCOPED_AO2LOCK(lock_topic, topic);
+       int res;
 
+       ao2_lock(topic);
        for (idx = 0; idx < AST_VECTOR_SIZE(&topic->upstream_topics); ++idx) {
                topic_remove_subscription(
                        AST_VECTOR_GET(&topic->upstream_topics, idx), sub);
        }
-
-       return AST_VECTOR_REMOVE_ELEM_UNORDERED(&topic->subscribers, sub,
+       res = AST_VECTOR_REMOVE_ELEM_UNORDERED(&topic->subscribers, sub,
                AST_VECTOR_ELEM_CLEANUP_NOOP);
+       ao2_unlock(topic);
+
+       return res;
 }
 
 /*!
@@ -575,9 +789,7 @@ static void dispatch_message(struct stasis_subscription *sub,
         */
        ao2_bump(message);
        if (!synchronous) {
-               if (ast_taskprocessor_push_local(sub->mailbox,
-                                                    dispatch_exec_async,
-                                                    message) != 0) {
+               if (ast_taskprocessor_push_local(sub->mailbox, dispatch_exec_async, message)) {
                        /* Push failed; ugh. */
                        ast_log(LOG_ERROR, "Dropping async dispatch\n");
                        ao2_cleanup(message);
@@ -590,12 +802,12 @@ static void dispatch_message(struct stasis_subscription *sub,
                std.complete = 0;
                std.task_data = message;
 
-               if (ast_taskprocessor_push_local(sub->mailbox,
-                                                    dispatch_exec_sync,
-                                                    &std)) {
+               if (ast_taskprocessor_push_local(sub->mailbox, dispatch_exec_sync, &std)) {
                        /* Push failed; ugh. */
                        ast_log(LOG_ERROR, "Dropping sync dispatch\n");
                        ao2_cleanup(message);
+                       ast_mutex_destroy(&std.lock);
+                       ast_cond_destroy(&std.cond);
                        return;
                }
 
@@ -692,15 +904,17 @@ struct stasis_forward *stasis_forward_cancel(struct stasis_forward *forward)
        from = forward->from_topic;
        to = forward->to_topic;
 
-       topic_lock_both(to, from);
-       AST_VECTOR_REMOVE_ELEM_UNORDERED(&to->upstream_topics, from,
-               AST_VECTOR_ELEM_CLEANUP_NOOP);
+       if (from && to) {
+               topic_lock_both(to, from);
+               AST_VECTOR_REMOVE_ELEM_UNORDERED(&to->upstream_topics, from,
+                       AST_VECTOR_ELEM_CLEANUP_NOOP);
 
-       for (idx = 0; idx < AST_VECTOR_SIZE(&to->subscribers); ++idx) {
-               topic_remove_subscription(from, AST_VECTOR_GET(&to->subscribers, idx));
+               for (idx = 0; idx < AST_VECTOR_SIZE(&to->subscribers); ++idx) {
+                       topic_remove_subscription(from, AST_VECTOR_GET(&to->subscribers, idx));
+               }
+               ao2_unlock(from);
+               ao2_unlock(to);
        }
-       ao2_unlock(from);
-       ao2_unlock(to);
 
        ao2_cleanup(forward);
 
@@ -712,17 +926,22 @@ struct stasis_forward *stasis_forward_all(struct stasis_topic *from_topic,
 {
        int res;
        size_t idx;
-       RAII_VAR(struct stasis_forward *, forward, NULL, ao2_cleanup);
+       struct stasis_forward *forward;
 
        if (!from_topic || !to_topic) {
                return NULL;
        }
 
-       forward = ao2_alloc(sizeof(*forward), forward_dtor);
+       forward = ao2_alloc_options(sizeof(*forward), forward_dtor, AO2_ALLOC_OPT_LOCK_NOLOCK);
        if (!forward) {
                return NULL;
        }
 
+       /* Forwards to ourselves are implicit. */
+       if (to_topic == from_topic) {
+               return forward;
+       }
+
        forward->from_topic = ao2_bump(from_topic);
        forward->to_topic = ao2_bump(to_topic);
 
@@ -731,6 +950,7 @@ struct stasis_forward *stasis_forward_all(struct stasis_topic *from_topic,
        if (res != 0) {
                ao2_unlock(from_topic);
                ao2_unlock(to_topic);
+               ao2_ref(forward, -1);
                return NULL;
        }
 
@@ -740,22 +960,24 @@ struct stasis_forward *stasis_forward_all(struct stasis_topic *from_topic,
        ao2_unlock(from_topic);
        ao2_unlock(to_topic);
 
-       return ao2_bump(forward);
+       return forward;
 }
 
 static void subscription_change_dtor(void *obj)
 {
        struct stasis_subscription_change *change = obj;
+
        ast_string_field_free_memory(change);
        ao2_cleanup(change->topic);
 }
 
 static struct stasis_subscription_change *subscription_change_alloc(struct stasis_topic *topic, const char *uniqueid, const char *description)
 {
-       RAII_VAR(struct stasis_subscription_change *, change, NULL, ao2_cleanup);
+       struct stasis_subscription_change *change;
 
        change = ao2_alloc(sizeof(struct stasis_subscription_change), subscription_change_dtor);
-       if (ast_string_field_init(change, 128)) {
+       if (!change || ast_string_field_init(change, 128)) {
+               ao2_cleanup(change);
                return NULL;
        }
 
@@ -764,51 +986,58 @@ static struct stasis_subscription_change *subscription_change_alloc(struct stasi
        ao2_ref(topic, +1);
        change->topic = topic;
 
-       ao2_ref(change, +1);
        return change;
 }
 
 static void send_subscription_subscribe(struct stasis_topic *topic, struct stasis_subscription *sub)
 {
-       RAII_VAR(struct stasis_subscription_change *, change, NULL, ao2_cleanup);
-       RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
+       struct stasis_subscription_change *change;
+       struct stasis_message *msg;
 
        /* This assumes that we have already unsubscribed */
        ast_assert(stasis_subscription_is_subscribed(sub));
 
-       change = subscription_change_alloc(topic, sub->uniqueid, "Subscribe");
+       if (!stasis_subscription_change_type()) {
+               return;
+       }
 
+       change = subscription_change_alloc(topic, sub->uniqueid, "Subscribe");
        if (!change) {
                return;
        }
 
        msg = stasis_message_create(stasis_subscription_change_type(), change);
-
        if (!msg) {
+               ao2_cleanup(change);
                return;
        }
 
        stasis_publish(topic, msg);
+       ao2_cleanup(msg);
+       ao2_cleanup(change);
 }
 
 static void send_subscription_unsubscribe(struct stasis_topic *topic,
        struct stasis_subscription *sub)
 {
-       RAII_VAR(struct stasis_subscription_change *, change, NULL, ao2_cleanup);
-       RAII_VAR(struct stasis_message *, msg, NULL, ao2_cleanup);
+       struct stasis_subscription_change *change;
+       struct stasis_message *msg;
 
        /* This assumes that we have already unsubscribed */
        ast_assert(!stasis_subscription_is_subscribed(sub));
 
-       change = subscription_change_alloc(topic, sub->uniqueid, "Unsubscribe");
+       if (!stasis_subscription_change_type()) {
+               return;
+       }
 
+       change = subscription_change_alloc(topic, sub->uniqueid, "Unsubscribe");
        if (!change) {
                return;
        }
 
        msg = stasis_message_create(stasis_subscription_change_type(), change);
-
        if (!msg) {
+               ao2_cleanup(change);
                return;
        }
 
@@ -816,6 +1045,9 @@ static void send_subscription_unsubscribe(struct stasis_topic *topic,
 
        /* Now we have to dispatch to the subscription itself */
        dispatch_message(sub, msg, 0);
+
+       ao2_cleanup(msg);
+       ao2_cleanup(change);
 }
 
 struct topic_pool_entry {
@@ -826,6 +1058,7 @@ struct topic_pool_entry {
 static void topic_pool_entry_dtor(void *obj)
 {
        struct topic_pool_entry *entry = obj;
+
        entry->forward = stasis_forward_cancel(entry->forward);
        ao2_cleanup(entry->topic);
        entry->topic = NULL;
@@ -833,7 +1066,8 @@ static void topic_pool_entry_dtor(void *obj)
 
 static struct topic_pool_entry *topic_pool_entry_alloc(void)
 {
-       return ao2_alloc(sizeof(struct topic_pool_entry), topic_pool_entry_dtor);
+       return ao2_alloc_options(sizeof(struct topic_pool_entry), topic_pool_entry_dtor,
+               AO2_ALLOC_OPT_LOCK_NOLOCK);
 }
 
 struct stasis_topic_pool {
@@ -844,6 +1078,7 @@ struct stasis_topic_pool {
 static void topic_pool_dtor(void *obj)
 {
        struct stasis_topic_pool *pool = obj;
+
        ao2_cleanup(pool->pool_container);
        pool->pool_container = NULL;
        ao2_cleanup(pool->pool_topic);
@@ -852,28 +1087,80 @@ static void topic_pool_dtor(void *obj)
 
 static int topic_pool_entry_hash(const void *obj, const int flags)
 {
-       const char *topic_name = (flags & OBJ_KEY) ? obj : stasis_topic_name(((struct topic_pool_entry*) obj)->topic);
-       return ast_str_case_hash(topic_name);
+       const struct topic_pool_entry *object;
+       const char *key;
+
+       switch (flags & OBJ_SEARCH_MASK) {
+       case OBJ_SEARCH_KEY:
+               key = obj;
+               break;
+       case OBJ_SEARCH_OBJECT:
+               object = obj;
+               key = stasis_topic_name(object->topic);
+               break;
+       default:
+               /* Hash can only work on something with a full key. */
+               ast_assert(0);
+               return 0;
+       }
+       return ast_str_case_hash(key);
 }
 
 static int topic_pool_entry_cmp(void *obj, void *arg, int flags)
 {
-       struct topic_pool_entry *opt1 = obj, *opt2 = arg;
-       const char *topic_name = (flags & OBJ_KEY) ? arg : stasis_topic_name(opt2->topic);
-       return strcasecmp(stasis_topic_name(opt1->topic), topic_name) ? 0 : CMP_MATCH | CMP_STOP;
+       const struct topic_pool_entry *object_left = obj;
+       const struct topic_pool_entry *object_right = arg;
+       const char *right_key = arg;
+       int cmp;
+
+       switch (flags & OBJ_SEARCH_MASK) {
+       case OBJ_SEARCH_OBJECT:
+               right_key = stasis_topic_name(object_right->topic);
+               /* Fall through */
+       case OBJ_SEARCH_KEY:
+               cmp = strcasecmp(stasis_topic_name(object_left->topic), right_key);
+               break;
+       case OBJ_SEARCH_PARTIAL_KEY:
+               /* Not supported by container */
+               ast_assert(0);
+               cmp = -1;
+               break;
+       default:
+               /*
+                * What arg points to is specific to this traversal callback
+                * and has no special meaning to astobj2.
+                */
+               cmp = 0;
+               break;
+       }
+       if (cmp) {
+               return 0;
+       }
+       /*
+        * At this point the traversal callback is identical to a sorted
+        * container.
+        */
+       return CMP_MATCH;
 }
 
 struct stasis_topic_pool *stasis_topic_pool_create(struct stasis_topic *pooled_topic)
 {
-       RAII_VAR(struct stasis_topic_pool *, pool, ao2_alloc(sizeof(*pool), topic_pool_dtor), ao2_cleanup);
+       struct stasis_topic_pool *pool;
+
+       pool = ao2_alloc_options(sizeof(*pool), topic_pool_dtor, AO2_ALLOC_OPT_LOCK_NOLOCK);
        if (!pool) {
                return NULL;
        }
-       pool->pool_container = ao2_container_alloc(TOPIC_POOL_BUCKETS, topic_pool_entry_hash, topic_pool_entry_cmp);
+
+       pool->pool_container = ao2_container_alloc(TOPIC_POOL_BUCKETS,
+               topic_pool_entry_hash, topic_pool_entry_cmp);
+       if (!pool->pool_container) {
+               ao2_cleanup(pool);
+               return NULL;
+       }
        ao2_ref(pooled_topic, +1);
        pool->pool_topic = pooled_topic;
 
-       ao2_ref(pool, +1);
        return pool;
 }
 
@@ -881,14 +1168,13 @@ struct stasis_topic *stasis_topic_pool_get_topic(struct stasis_topic_pool *pool,
 {
        RAII_VAR(struct topic_pool_entry *, topic_pool_entry, NULL, ao2_cleanup);
        SCOPED_AO2LOCK(topic_container_lock, pool->pool_container);
-       topic_pool_entry = ao2_find(pool->pool_container, topic_name, OBJ_KEY | OBJ_NOLOCK);
 
+       topic_pool_entry = ao2_find(pool->pool_container, topic_name, OBJ_SEARCH_KEY | OBJ_NOLOCK);
        if (topic_pool_entry) {
                return topic_pool_entry->topic;
        }
 
        topic_pool_entry = topic_pool_entry_alloc();
-
        if (!topic_pool_entry) {
                return NULL;
        }
@@ -903,29 +1189,501 @@ struct stasis_topic *stasis_topic_pool_get_topic(struct stasis_topic_pool *pool,
                return NULL;
        }
 
-       ao2_link_flags(pool->pool_container, topic_pool_entry, OBJ_NOLOCK);
+       if (!ao2_link_flags(pool->pool_container, topic_pool_entry, OBJ_NOLOCK)) {
+               return NULL;
+       }
 
        return topic_pool_entry->topic;
 }
 
+int stasis_topic_pool_topic_exists(const struct stasis_topic_pool *pool, const char *topic_name)
+{
+       struct topic_pool_entry *topic_pool_entry;
+
+       topic_pool_entry = ao2_find(pool->pool_container, topic_name, OBJ_SEARCH_KEY);
+       if (!topic_pool_entry) {
+               return 0;
+       }
+
+       ao2_ref(topic_pool_entry, -1);
+       return 1;
+}
+
 void stasis_log_bad_type_access(const char *name)
 {
-       ast_log(LOG_ERROR, "Use of %s() before init/after destruction\n", name);
+#ifdef AST_DEVMODE
+       if (!stasis_message_type_declined(name)) {
+               ast_log(LOG_ERROR, "Use of %s() before init/after destruction\n", name);
+       }
+#endif
+}
+
+/*! \brief A multi object blob data structure to carry user event stasis messages */
+struct ast_multi_object_blob {
+       struct ast_json *blob;                             /*< A blob of JSON data */
+       AST_VECTOR(, void *) snapshots[STASIS_UMOS_MAX];   /*< Vector of snapshots for each type */
+};
+
+/*!
+ * \internal
+ * \brief Destructor for \ref ast_multi_object_blob objects
+ */
+static void multi_object_blob_dtor(void *obj)
+{
+       struct ast_multi_object_blob *multi = obj;
+       int type;
+       int i;
+
+       for (type = 0; type < STASIS_UMOS_MAX; ++type) {
+               for (i = 0; i < AST_VECTOR_SIZE(&multi->snapshots[type]); ++i) {
+                       ao2_cleanup(AST_VECTOR_GET(&multi->snapshots[type], i));
+               }
+               AST_VECTOR_FREE(&multi->snapshots[type]);
+       }
+       ast_json_unref(multi->blob);
+}
+
+/*! \brief Create a stasis user event multi object blob */
+struct ast_multi_object_blob *ast_multi_object_blob_create(struct ast_json *blob)
+{
+       int type;
+       struct ast_multi_object_blob *multi;
+
+       ast_assert(blob != NULL);
+
+       multi = ao2_alloc(sizeof(*multi), multi_object_blob_dtor);
+       if (!multi) {
+               return NULL;
+       }
+
+       for (type = 0; type < STASIS_UMOS_MAX; ++type) {
+               if (AST_VECTOR_INIT(&multi->snapshots[type], 0)) {
+                       ao2_ref(multi, -1);
+
+                       return NULL;
+               }
+       }
+
+       multi->blob = ast_json_ref(blob);
+
+       return multi;
+}
+
+/*! \brief Add an object (snapshot) to the blob */
+void ast_multi_object_blob_add(struct ast_multi_object_blob *multi,
+       enum stasis_user_multi_object_snapshot_type type, void *object)
+{
+       if (!multi || !object || AST_VECTOR_APPEND(&multi->snapshots[type], object)) {
+               ao2_cleanup(object);
+       }
+}
+
+/*! \brief Publish single channel user event (for app_userevent compatibility) */
+void ast_multi_object_blob_single_channel_publish(struct ast_channel *chan,
+       struct stasis_message_type *type, struct ast_json *blob)
+{
+       struct stasis_message *message;
+       struct ast_channel_snapshot *channel_snapshot;
+       struct ast_multi_object_blob *multi;
+
+       if (!type) {
+               return;
+       }
+
+       multi = ast_multi_object_blob_create(blob);
+       if (!multi) {
+               return;
+       }
+
+       channel_snapshot = ast_channel_snapshot_create(chan);
+       if (!channel_snapshot) {
+               ao2_ref(multi, -1);
+               return;
+       }
+
+       /* this call steals the channel_snapshot reference */
+       ast_multi_object_blob_add(multi, STASIS_UMOS_CHANNEL, channel_snapshot);
+
+       message = stasis_message_create(type, multi);
+       ao2_ref(multi, -1);
+       if (message) {
+               /* app_userevent still publishes to channel */
+               stasis_publish(ast_channel_topic(chan), message);
+               ao2_ref(message, -1);
+       }
+}
+
+/*! \internal \brief convert multi object blob to ari json */
+static struct ast_json *multi_user_event_to_json(
+       struct stasis_message *message,
+       const struct stasis_message_sanitizer *sanitize)
+{
+       struct ast_json *out;
+       struct ast_multi_object_blob *multi = stasis_message_data(message);
+       struct ast_json *blob = multi->blob;
+       const struct timeval *tv = stasis_message_timestamp(message);
+       enum stasis_user_multi_object_snapshot_type type;
+       int i;
+
+       out = ast_json_object_create();
+       if (!out) {
+               return NULL;
+       }
+
+       ast_json_object_set(out, "type", ast_json_string_create("ChannelUserevent"));
+       ast_json_object_set(out, "timestamp", ast_json_timeval(*tv, NULL));
+       ast_json_object_set(out, "eventname", ast_json_string_create(ast_json_string_get((ast_json_object_get(blob, "eventname")))));
+       ast_json_object_set(out, "userevent", ast_json_deep_copy(blob));
+
+       for (type = 0; type < STASIS_UMOS_MAX; ++type) {
+               for (i = 0; i < AST_VECTOR_SIZE(&multi->snapshots[type]); ++i) {
+                       struct ast_json *json_object = NULL;
+                       char *name = NULL;
+                       void *snapshot = AST_VECTOR_GET(&multi->snapshots[type], i);
+
+                       switch (type) {
+                       case STASIS_UMOS_CHANNEL:
+                               json_object = ast_channel_snapshot_to_json(snapshot, sanitize);
+                               name = "channel";
+                               break;
+                       case STASIS_UMOS_BRIDGE:
+                               json_object = ast_bridge_snapshot_to_json(snapshot, sanitize);
+                               name = "bridge";
+                               break;
+                       case STASIS_UMOS_ENDPOINT:
+                               json_object = ast_endpoint_snapshot_to_json(snapshot, sanitize);
+                               name = "endpoint";
+                               break;
+                       }
+                       if (json_object) {
+                               ast_json_object_set(out, name, json_object);
+                       }
+               }
+       }
+
+       return out;
+}
+
+/*! \internal \brief convert multi object blob to ami string */
+static struct ast_str *multi_object_blob_to_ami(void *obj)
+{
+       struct ast_str *ami_str=ast_str_create(1024);
+       struct ast_str *ami_snapshot;
+       const struct ast_multi_object_blob *multi = obj;
+       enum stasis_user_multi_object_snapshot_type type;
+       int i;
+
+       if (!ami_str) {
+               return NULL;
+       }
+       if (!multi) {
+               ast_free(ami_str);
+               return NULL;
+       }
+
+       for (type = 0; type < STASIS_UMOS_MAX; ++type) {
+               for (i = 0; i < AST_VECTOR_SIZE(&multi->snapshots[type]); ++i) {
+                       char *name = NULL;
+                       void *snapshot = AST_VECTOR_GET(&multi->snapshots[type], i);
+                       ami_snapshot = NULL;
+
+                       if (i > 0) {
+                               ast_asprintf(&name, "%d", i + 1);
+                       }
+
+                       switch (type) {
+                       case STASIS_UMOS_CHANNEL:
+                               ami_snapshot = ast_manager_build_channel_state_string_prefix(snapshot, name ?: "");
+                               break;
+
+                       case STASIS_UMOS_BRIDGE:
+                               ami_snapshot = ast_manager_build_bridge_state_string_prefix(snapshot, name ?: "");
+                               break;
+
+                       case STASIS_UMOS_ENDPOINT:
+                               /* currently not sending endpoint snapshots to AMI */
+                               break;
+                       }
+                       if (ami_snapshot) {
+                               ast_str_append(&ami_str, 0, "%s", ast_str_buffer(ami_snapshot));
+                               ast_free(ami_snapshot);
+                       }
+                       ast_free(name);
+               }
+       }
+
+       return ami_str;
 }
 
+/*! \internal \brief Callback to pass only user defined parameters from blob */
+static int userevent_exclusion_cb(const char *key)
+{
+       if (!strcmp("eventname", key)) {
+               return 1;
+       }
+       return 0;
+}
+
+static struct ast_manager_event_blob *multi_user_event_to_ami(
+       struct stasis_message *message)
+{
+       RAII_VAR(struct ast_str *, object_string, NULL, ast_free);
+       RAII_VAR(struct ast_str *, body, NULL, ast_free);
+       struct ast_multi_object_blob *multi = stasis_message_data(message);
+       const char *eventname;
+
+       eventname = ast_json_string_get(ast_json_object_get(multi->blob, "eventname"));
+       body = ast_manager_str_from_json_object(multi->blob, userevent_exclusion_cb);
+       object_string = multi_object_blob_to_ami(multi);
+       if (!object_string || !body) {
+               return NULL;
+       }
+
+       return ast_manager_event_blob_create(EVENT_FLAG_USER, "UserEvent",
+               "%s"
+               "UserEvent: %s\r\n"
+               "%s",
+               ast_str_buffer(object_string),
+               eventname,
+               ast_str_buffer(body));
+}
+
+/*! \brief A structure to hold global configuration-related options */
+struct stasis_declined_config {
+       /*! The list of message types to decline */
+       struct ao2_container *declined;
+};
+
+/*! \brief Threadpool configuration options */
+struct stasis_threadpool_conf {
+       /*! Initial size of the thread pool */
+       int initial_size;
+       /*! Time, in seconds, before we expire a thread */
+       int idle_timeout_sec;
+       /*! Maximum number of thread to allow */
+       int max_size;
+};
+
+struct stasis_config {
+       /*! Thread pool configuration options */
+       struct stasis_threadpool_conf *threadpool_options;
+       /*! Declined message types */
+       struct stasis_declined_config *declined_message_types;
+};
+
+static struct aco_type threadpool_option = {
+       .type = ACO_GLOBAL,
+       .name = "threadpool",
+       .item_offset = offsetof(struct stasis_config, threadpool_options),
+       .category = "threadpool",
+       .category_match = ACO_WHITELIST_EXACT,
+};
+
+static struct aco_type *threadpool_options[] = ACO_TYPES(&threadpool_option);
+
+/*! \brief An aco_type structure to link the "declined_message_types" category to the stasis_declined_config type */
+static struct aco_type declined_option = {
+       .type = ACO_GLOBAL,
+       .name = "declined_message_types",
+       .item_offset = offsetof(struct stasis_config, declined_message_types),
+       .category_match = ACO_WHITELIST_EXACT,
+       .category = "declined_message_types",
+};
+
+struct aco_type *declined_options[] = ACO_TYPES(&declined_option);
+
+struct aco_file stasis_conf = {
+        .filename = "stasis.conf",
+       .types = ACO_TYPES(&declined_option, &threadpool_option),
+};
+
+/*! \brief A global object container that will contain the stasis_config that gets swapped out on reloads */
+static AO2_GLOBAL_OBJ_STATIC(globals);
+
+static void *stasis_config_alloc(void);
+
+/*! \brief Register information about the configs being processed by this module */
+CONFIG_INFO_CORE("stasis", cfg_info, globals, stasis_config_alloc,
+        .files = ACO_FILES(&stasis_conf),
+);
+
+static void stasis_declined_config_destructor(void *obj)
+{
+       struct stasis_declined_config *declined = obj;
+
+       ao2_cleanup(declined->declined);
+}
+
+static void stasis_config_destructor(void *obj)
+{
+       struct stasis_config *cfg = obj;
+
+       ao2_cleanup(cfg->declined_message_types);
+       ast_free(cfg->threadpool_options);
+}
+
+static void *stasis_config_alloc(void)
+{
+       struct stasis_config *cfg;
+
+       if (!(cfg = ao2_alloc(sizeof(*cfg), stasis_config_destructor))) {
+               return NULL;
+       }
+
+       cfg->threadpool_options = ast_calloc(1, sizeof(*cfg->threadpool_options));
+       if (!cfg->threadpool_options) {
+               ao2_ref(cfg, -1);
+               return NULL;
+       }
+
+       cfg->declined_message_types = ao2_alloc(sizeof(*cfg->declined_message_types),
+               stasis_declined_config_destructor);
+       if (!cfg->declined_message_types) {
+               ao2_ref(cfg, -1);
+               return NULL;
+       }
+
+       cfg->declined_message_types->declined = ast_str_container_alloc(13);
+       if (!cfg->declined_message_types->declined) {
+               ao2_ref(cfg, -1);
+               return NULL;
+       }
+
+       return cfg;
+}
+
+int stasis_message_type_declined(const char *name)
+{
+       struct stasis_config *cfg = ao2_global_obj_ref(globals);
+       char *name_in_declined;
+       int res;
+
+       if (!cfg || !cfg->declined_message_types) {
+               ao2_cleanup(cfg);
+               return 0;
+       }
+
+       name_in_declined = ao2_find(cfg->declined_message_types->declined, name, OBJ_SEARCH_KEY);
+       res = name_in_declined ? 1 : 0;
+       ao2_cleanup(name_in_declined);
+       ao2_ref(cfg, -1);
+       if (res) {
+               ast_log(LOG_NOTICE, "Declining to allocate Stasis message type '%s' due to configuration\n", name);
+       }
+       return res;
+}
+
+static int declined_handler(const struct aco_option *opt, struct ast_variable *var, void *obj)
+{
+       struct stasis_declined_config *declined = obj;
+
+       if (ast_strlen_zero(var->value)) {
+               return 0;
+       }
+
+       if (ast_str_container_add(declined->declined, var->value)) {
+               return -1;
+       }
+
+       return 0;
+}
+
+/*!
+ * @{ \brief Define multi user event message type(s).
+ */
+
+STASIS_MESSAGE_TYPE_DEFN(ast_multi_user_event_type,
+       .to_json = multi_user_event_to_json,
+       .to_ami = multi_user_event_to_ami,
+       );
+
+/*! @} */
+
 /*! \brief Cleanup function for graceful shutdowns */
 static void stasis_cleanup(void)
 {
+       ast_threadpool_shutdown(pool);
+       pool = NULL;
        STASIS_MESSAGE_TYPE_CLEANUP(stasis_subscription_change_type);
+       STASIS_MESSAGE_TYPE_CLEANUP(ast_multi_user_event_type);
+       aco_info_destroy(&cfg_info);
+       ao2_global_obj_release(globals);
 }
 
 int stasis_init(void)
 {
+       struct stasis_config *cfg;
        int cache_init;
+       struct ast_threadpool_options threadpool_opts = { 0, };
 
        /* Be sure the types are cleaned up after the message bus */
        ast_register_cleanup(stasis_cleanup);
 
+       if (aco_info_init(&cfg_info)) {
+               return -1;
+       }
+
+       aco_option_register_custom(&cfg_info, "decline", ACO_EXACT,
+               declined_options, "", declined_handler, 0);
+       aco_option_register(&cfg_info, "initial_size", ACO_EXACT,
+               threadpool_options, "5", OPT_INT_T, PARSE_IN_RANGE,
+               FLDSET(struct stasis_threadpool_conf, initial_size), 0,
+               INT_MAX);
+       aco_option_register(&cfg_info, "idle_timeout_sec", ACO_EXACT,
+               threadpool_options, "20", OPT_INT_T, PARSE_IN_RANGE,
+               FLDSET(struct stasis_threadpool_conf, idle_timeout_sec), 0,
+               INT_MAX);
+       aco_option_register(&cfg_info, "max_size", ACO_EXACT,
+               threadpool_options, "50", OPT_INT_T, PARSE_IN_RANGE,
+               FLDSET(struct stasis_threadpool_conf, max_size), 0,
+               INT_MAX);
+
+       if (aco_process_config(&cfg_info, 0) == ACO_PROCESS_ERROR) {
+               struct stasis_config *default_cfg = stasis_config_alloc();
+
+               if (!default_cfg) {
+                       return -1;
+               }
+
+               if (aco_set_defaults(&threadpool_option, "threadpool", default_cfg->threadpool_options)) {
+                       ast_log(LOG_ERROR, "Failed to initialize defaults on Stasis configuration object\n");
+                       ao2_ref(default_cfg, -1);
+
+                       return -1;
+               }
+
+               if (aco_set_defaults(&declined_option, "declined_message_types", default_cfg->declined_message_types)) {
+                       ast_log(LOG_ERROR, "Failed to load stasis.conf and failed to initialize defaults.\n");
+                       ao2_ref(default_cfg, -1);
+
+                       return -1;
+               }
+
+               ast_log(LOG_NOTICE, "Could not load Stasis configuration; using defaults\n");
+               ao2_global_obj_replace_unref(globals, default_cfg);
+               cfg = default_cfg;
+       } else {
+               cfg = ao2_global_obj_ref(globals);
+               if (!cfg) {
+                       ast_log(LOG_ERROR, "Failed to obtain Stasis configuration object\n");
+
+                       return -1;
+               }
+       }
+
+       threadpool_opts.version = AST_THREADPOOL_OPTIONS_VERSION;
+       threadpool_opts.initial_size = cfg->threadpool_options->initial_size;
+       threadpool_opts.auto_increment = 1;
+       threadpool_opts.max_size = cfg->threadpool_options->max_size;
+       threadpool_opts.idle_timeout = cfg->threadpool_options->idle_timeout_sec;
+       pool = ast_threadpool_create("stasis-core", NULL, &threadpool_opts);
+       ao2_ref(cfg, -1);
+       if (!pool) {
+               ast_log(LOG_ERROR, "Failed to create 'stasis-core' threadpool\n");
+
+               return -1;
+       }
+
        cache_init = stasis_cache_init();
        if (cache_init != 0) {
                return -1;
@@ -934,6 +1692,9 @@ int stasis_init(void)
        if (STASIS_MESSAGE_TYPE_INIT(stasis_subscription_change_type) != 0) {
                return -1;
        }
+       if (STASIS_MESSAGE_TYPE_INIT(ast_multi_user_event_type) != 0) {
+               return -1;
+       }
 
        return 0;
 }