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Implement local notification.

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The default behavior is to only notify remote changes, but for some
applications (e.g. GUI's) it's advantageous to know about local
changes as well.

This is (slightly) optimized in that local changes only result in
additional resources being consumed if (any) local listeners have been
created.
This commit is contained in:
Peter Johnson
2015-09-23 00:56:08 -07:00
parent 75358e6c45
commit 424bf51a7b
14 changed files with 173 additions and 42 deletions
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27
src/Notifier.h
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@@ -37,11 +37,12 @@ class Notifier {
static bool destroyed() { return s_destroyed; }
unsigned int AddEntryListener(StringRef prefix,
EntryListenerCallback callback);
EntryListenerCallback callback,
bool local_notify);
void RemoveEntryListener(unsigned int entry_listener_uid);
void NotifyEntry(StringRef name, std::shared_ptr<Value> value, bool is_new,
EntryListenerCallback only = nullptr);
bool is_local, EntryListenerCallback only = nullptr);
unsigned int AddConnectionListener(ConnectionListenerCallback callback);
void RemoveConnectionListener(unsigned int conn_listener_uid);
@@ -55,20 +56,36 @@ class Notifier {
void ThreadMain();
std::atomic_bool m_active;
std::atomic_bool m_local_notifiers;
std::mutex m_mutex;
std::condition_variable m_cond;
std::vector<std::pair<std::string, EntryListenerCallback>> m_entry_listeners;
struct EntryListener {
EntryListener(StringRef prefix_, EntryListenerCallback callback_,
bool local_notify_)
: prefix(prefix_), callback(callback_), local_notify(local_notify_) {}
std::string prefix;
EntryListenerCallback callback;
bool local_notify;
};
std::vector<EntryListener> m_entry_listeners;
std::vector<ConnectionListenerCallback> m_conn_listeners;
struct EntryNotification {
EntryNotification(StringRef name_, std::shared_ptr<Value> value_,
bool is_new_, EntryListenerCallback only_)
: name(name_), value(value_), is_new(is_new_), only(only_) {}
bool is_new_, bool is_local_, EntryListenerCallback only_)
: name(name_),
value(value_),
is_new(is_new_),
is_local(is_local_),
only(only_) {}
std::string name;
std::shared_ptr<Value> value;
bool is_new;
bool is_local;
EntryListenerCallback only;
};
std::queue<EntryNotification> m_entry_notifications;