288 lines
9.9 KiB
C
288 lines
9.9 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* David M. Lee, II <dlee@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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#ifndef _ASTERISK_STASIS_MESSAGE_ROUTER_H
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#define _ASTERISK_STASIS_MESSAGE_ROUTER_H
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/*!
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* \brief A simplistic router for \ref stasis_message's.
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*
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* Often times, when subscribing to a topic, one wants to handle different
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* message types differently. While one could cascade if/else statements through
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* the subscription handler, it is much cleaner to specify a different callback
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* for each message type. The \ref stasis_message_router is here to help!
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*
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* A \ref stasis_message_router is constructed for a particular \ref
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* stasis_topic, which is subscribes to. Call
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* stasis_message_router_unsubscribe() to cancel that subscription.
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*
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* Once constructed, routes can be added using stasis_message_router_add() (or
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* stasis_message_router_set_default() for any messages not handled by other
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* routes). There may be only one route per \ref stasis_message_type. The
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* route's \a callback is invoked just as if it were a callback for a
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* subscription; but it only gets called for messages of the specified type.
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*
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* \since 12
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*/
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#include "asterisk/stasis.h"
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/*! \brief Stasis message routing object */
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struct stasis_message_router;
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/*!
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* \brief Create a new message router object.
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*
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* \param topic Topic to subscribe route to.
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*
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* \return New \ref stasis_message_router.
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* \retval NULL on error.
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*
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* \since 12
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*/
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#define stasis_message_router_create(topic) __stasis_message_router_create(topic, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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struct stasis_message_router *__stasis_message_router_create(
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struct stasis_topic *topic, const char *file, int lineno, const char *func);
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/*!
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* \brief Create a new message router object.
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*
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* The subscription created for this message router will dispatch
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* callbacks on a thread pool.
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*
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* \param topic Topic to subscribe route to.
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*
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* \return New \ref stasis_message_router.
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* \retval NULL on error.
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*
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* \since 12.8.0
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*/
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#define stasis_message_router_create_pool(topic) __stasis_message_router_create_pool(topic, __FILE__, __LINE__, __PRETTY_FUNCTION__)
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struct stasis_message_router *__stasis_message_router_create_pool(
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struct stasis_topic *topic, const char *file, int lineno, const char *func);
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/*!
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* \brief Unsubscribe the router from the upstream topic.
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*
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* \param router Router to unsubscribe.
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*
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* \since 12
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*/
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void stasis_message_router_unsubscribe(struct stasis_message_router *router);
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/*!
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* \brief Unsubscribe the router from the upstream topic, blocking until the
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* final message has been processed.
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*
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* See stasis_unsubscribe_and_join() for info on when to use this
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* vs. stasis_message_router_unsubscribe().
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*
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* \param router Router to unsubscribe.
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*
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* \since 12
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*/
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void stasis_message_router_unsubscribe_and_join(
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struct stasis_message_router *router);
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/*!
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* \brief Returns whether \a router has received its final message.
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*
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* \param router Router.
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*
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* \retval True (non-zero) if stasis_subscription_final_message() has been
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* received.
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* \retval False (zero) if waiting for the end.
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*/
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int stasis_message_router_is_done(struct stasis_message_router *router);
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/*!
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* \brief Publish a message to a message router's subscription synchronously
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*
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* \param router Router
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* \param message The \ref stasis message
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*
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* This should be used when a message needs to be published synchronously to
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* the underlying subscription created by a message router. This is analagous
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* to \ref stasis_publish_sync.
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*
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* Note that the caller will be blocked until the thread servicing the message
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* on the message router's subscription completes handling of the message.
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*
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* \since 12.1.0
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*/
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void stasis_message_router_publish_sync(struct stasis_message_router *router,
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struct stasis_message *message);
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/*!
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* \brief Set the high and low alert water marks of the stasis message router.
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* \since 13.10.0
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*
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* \param router Pointer to a stasis message router
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* \param low_water New queue low water mark. (-1 to set as 90% of high_water)
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* \param high_water New queue high water mark.
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*
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* \retval 0 on success.
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* \retval -1 on error (water marks not changed).
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*/
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int stasis_message_router_set_congestion_limits(struct stasis_message_router *router,
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long low_water, long high_water);
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/*!
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* \brief Add a route to a message router.
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*
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* A particular \a message_type may have at most one route per \a router. If
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* you route \ref stasis_cache_update messages, the callback will only receive
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* updates for types not handled by routes added with
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* stasis_message_router_add_cache_update().
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*
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* Adding multiple routes for the same message type results in undefined
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* behavior.
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*
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* \param router Router to add the route to.
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* \param message_type Type of message to route.
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* \param callback Callback to forward messages of \a message_type to.
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* \param data Data pointer to pass to \a callback.
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*
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* \retval 0 on success
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* \retval -1 on failure
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*
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* \since 12
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*/
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int stasis_message_router_add(struct stasis_message_router *router,
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struct stasis_message_type *message_type,
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stasis_subscription_cb callback, void *data);
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/*!
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* \brief Add a route for \ref stasis_cache_update messages to a message router.
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*
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* A particular \a message_type may have at most one cache route per \a router.
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* These are distinct from regular routes, so one could have both a regular
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* route and a cache route for the same \a message_type.
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*
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* Adding multiple routes for the same message type results in undefined
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* behavior.
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*
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* \param router Router to add the route to.
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* \param message_type Subtype of cache update to route.
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* \param callback Callback to forward messages of \a message_type to.
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* \param data Data pointer to pass to \a callback.
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*
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* \retval 0 on success
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* \retval -1 on failure
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*
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* \since 12
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*/
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int stasis_message_router_add_cache_update(struct stasis_message_router *router,
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struct stasis_message_type *message_type,
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stasis_subscription_cb callback, void *data);
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/*!
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* \brief Remove a route from a message router.
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*
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* If a route is removed from another thread, there is no notification that
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* all messages using this route have been processed. This typically means that
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* the associated \c data pointer for this route must be kept until the
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* route itself is disposed of.
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*
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* \param router Router to remove the route from.
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* \param message_type Type of message to route.
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*
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* \since 12
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*/
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void stasis_message_router_remove(struct stasis_message_router *router,
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struct stasis_message_type *message_type);
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/*!
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* \brief Remove a cache route from a message router.
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*
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* If a route is removed from another thread, there is no notification that
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* all messages using this route have been processed. This typically means that
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* the associated \c data pointer for this route must be kept until the
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* route itself is disposed of.
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*
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* \param router Router to remove the route from.
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* \param message_type Type of message to route.
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*
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* \since 12
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*/
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void stasis_message_router_remove_cache_update(
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struct stasis_message_router *router,
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struct stasis_message_type *message_type);
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/*!
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* \brief Sets the default route of a router.
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*
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* \param router Router to set the default route of.
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* \param callback Callback to forward messages which otherwise have no home.
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* \param data Data pointer to pass to \a callback.
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*
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* \retval 0 on success
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* \retval -1 on failure
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*
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* \since 12
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*
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* \note Setting a default callback will automatically cause the underlying
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* subscription to receive all messages and not be filtered. If filtering is
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* desired then a specific route for each message type should be provided.
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*/
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int stasis_message_router_set_default(struct stasis_message_router *router,
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stasis_subscription_cb callback,
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void *data);
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/*!
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* \brief Sets the default route of a router with formatters.
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*
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* \param router Router to set the default route of.
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* \param callback Callback to forward messages which otherwise have no home.
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* \param data Data pointer to pass to \a callback.
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* \param formatters A bitmap of \ref stasis_subscription_message_formatters we wish to receive.
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*
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* \since 13.26.0
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* \since 16.3.0
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*
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* \note If formatters are specified then the message router will remain in a selective
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* filtering state. Any explicit routes will receive messages of their message type and
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* the default callback will only receive messages that have one of the given formatters.
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* Explicit routes will not be filtered according to the given formatters.
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*/
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void stasis_message_router_set_formatters_default(struct stasis_message_router *router,
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stasis_subscription_cb callback,
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void *data,
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enum stasis_subscription_message_formatters formatters);
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/*!
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* \brief Indicate to a message router that we are interested in messages with one or more formatters.
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*
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* The formatters are passed on to the underlying subscription.
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*
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* \warning With direct subscriptions, adding a formatter filter is an OR operation
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* with any message type filters. In the current implementation of message router however,
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* it's an AND operation. Even when setting a default route, the callback will only get
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* messages that have the formatters provides in this call.
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*
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* \param router Router to set the formatters of.
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* \param formatters A bitmap of \ref stasis_subscription_message_formatters we wish to receive.
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*
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* \since 13.25.0
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* \since 16.2.0
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*/
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void stasis_message_router_accept_formatters(struct stasis_message_router *router,
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enum stasis_subscription_message_formatters formatters);
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#endif /* _ASTERISK_STASIS_MESSAGE_ROUTER_H */
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