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https://issues.apache.org/jira/browse/DISPATCH-2267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17445173#comment-17445173
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ASF GitHub Bot commented on DISPATCH-2267:
------------------------------------------
ted-ross commented on a change in pull request #1435:
URL: https://github.com/apache/qpid-dispatch/pull/1435#discussion_r751254686
##########
File path: include/qpid/dispatch/router_core.h
##########
@@ -160,6 +169,64 @@ void qdr_send_to2(qdr_core_t *core, qd_message_t *msg,
const char *addr,
bool exclude_inprocess, bool control);
+/**
+ ******************************************************************************
+ * Address watch functions
+ ******************************************************************************
+ */
+
+typedef uint32_t qdr_watch_handle_t;
+
+/**
+ * Handler for updates on watched addresses. This function shall be invoked
on an IO thread.
+ *
+ * Note: This function will be invoked when a watched address has a change in
reachability.
+ * It is possible that the function may be called when no change occurs,
particularly when an
+ * address is removed from the core address table.
+ *
+ * @param context The opaque context supplied in the call to
qdr_core_watch_address
+ * @param local_consumers Number of consuming (outgoing) links for this
address on this router
+ * @param in_proc_consumers Number of in-process consumers for this address on
this router
+ * @param remote_consumers Number of remote routers with consumers for this
address
+ * @param local_producers Number of producing (incoming) links for this
address on this router
+ */
+typedef void (*qdr_address_watch_update_t)(void *context,
+ uint32_t local_consumers,
+ uint32_t in_proc_consumers,
+ uint32_t remote_consumers,
+ uint32_t local_producers);
+
+/**
+ * qdr_core_watch_address
+ *
+ * Subscribe to watch for changes in the reachability for an address. It is
safe to invoke this
+ * function from an IO thread.
+ *
+ * @param core Pointer to the core module
+ * @param address The address to be watched
+ * @param aclass Address class character
+ * @param phase Address phase character ('0' .. '9')
+ * @param on_watch The handler function
+ * @param context The opaque context sent to the handler on all invocations
+ * @return Watch handle to be used when canceling the watch
+ */
+qdr_watch_handle_t qdr_core_watch_address(qdr_core_t *core,
+ const char *address,
+ char aclass,
+ char phase,
+ qdr_address_watch_update_t on_watch,
+ void *context);
+
+/**
+ * qdr_core_unwatch_address
+ *
+ * Cancel an address watch subscription. It is safe to invoke this function
from an IO thread.
Review comment:
Yes, this is a good catch. It will require a bit of re-work, but I'll
make it so that this cannot happen.
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> Add a core-thread facility to allow IO modules to subscribe to
> address-reachability data
> ----------------------------------------------------------------------------------------
>
> Key: DISPATCH-2267
> URL: https://issues.apache.org/jira/browse/DISPATCH-2267
> Project: Qpid Dispatch
> Issue Type: Improvement
> Components: Router Node
> Reporter: Ted Ross
> Assignee: Ted Ross
> Priority: Major
> Fix For: 1.19.0
>
>
> Add a facility to the Core Thread that allows an IO-thread module to register
> for updates about a particular address. Callbacks into the IO-thread (on an
> IO thread) shall inform the module about changes to the reachability of an
> address.
> This can be used by a protocol listener to open or close the listening socket
> for a protocol listener based on the availability of remote connectors.
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