"Vue.js UserCP Mockup Version 0.20 - Badge Notifications"

Post #303031188 by Neo on Saturday 23rd of February 2019 04:06:48 AM

Vue.js UserCP Mockup Version 0.22 - Badge Notifications


In this cosmetic mockup release:
  • Badge Notifications: Changed Icon to "trophy"
  • Dashboard: Changed "stats badges" to the same "blue color" (earlier suggestion by nezabudka, Forum Advisor, to reduce colors)
  • Media: Reduce notification dropdown size on phones to 300px.


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notify(3)						   BSD Library Functions Manual 						 notify(3)

notify_post, notify_register_check, notify_register_dispatch, notify_register_signal, notify_register_mach_port, notify_register_file_descriptor, notify_check, notify_get_state, notify_set_state, notify_suspend, notify_resume, notify_cancel, notify_is_valid_token -- event distribution functions SYNOPSIS
#include <notify.h> uint32_t notify_post(const char *name); uint32_t notify_register_check(const char *name, int *out_token); void (^notify_handler_t)(int token); uint32_t notify_register_dispatch(const char *name, int *out_token, dispatch_queue_t queue, notify_handler_t handler); uint32_t notify_register_signal(const char *name, int sig, int *out_token); uint32_t notify_register_mach_port(const char *name, mach_port_t *notify_port, int flags, int *out_token); uint32_t notify_register_file_descriptor(const char *name, int *notify_fd, int flags, int *out_token); uint32_t notify_check(int token, int *check); uint32_t notify_set_state(int token, uint64_t state); uint32_t notify_get_state(int token, uint64_t *state); uint32_t notify_suspend(int token); uint32_t notify_resume(int token); uint32_t notify_cancel(int token); bool notify_is_valid_token(int val); DESCRIPTION
These routines allow processes to exchange stateless notification events. Processes post notifications to a single system-wide notification server, which then distributes notifications to client processes that have registered to receive those notifications, including processes run by other users. Notifications are associated with names in a namespace shared by all clients of the system. Clients may post notifications for names, and may monitor names for posted notifications. Clients may request notification delivery by a number of different methods. Clients desiring to monitor names in the notification system must register with the system, providing a name and other information required for the desired notification delivery method. Clients are given an integer token representing the registration. Token values are zero or positive integers. The kernel provides limited queues for mach message and file descriptor messages. It is important to make sure that clients read mach ports and file descriptors frequently to prevent messages from being lost due to resource limitations. Clients that use signal-based notification should be aware that signals are not delivered to a process while it is running in a signal handler. This may affect the delivery of signals in close succession. Notifications may be coalesced in some cases. Multiple events posted for a name in rapid succession may result in a single notification sent to clients registered for notification for that name. Clients checking for changes using the notify_check() routine cannot determine if more than one event has been posted since a previous call to notify_check() for that name. "False positives" may occur in notify_check() when used with a token generated by notify_register_check() due to implementation constraints. This behavior may vary in future releases. notify_post This routine causes the system to send a notification for the given name to all clients that have registered for notifications of this name. This is the only API required for an application that only produces notifications. notify_register_check Registers for passive notification for the given name. The routine generates a token that may be used with the notify_check() routine to check if any notifications have been posted for the name. The check is implemented using a shared memory scheme, making the check very fast and efficient. The implementation has a limited amount of shared memory, so developers are encouraged to use this mechanism sparingly. It is also important to release the resources consumed by a registration with notify_cancel() when they are no longer required by the applica- tion. notify_register_dispatch registers a callback handler in the form of a block which will be dispatched to the queue when a notification for the given name is received. This is a convenient way to register callbacks without any management of file descriptors, mach ports, or signals on the part of the applica- tion. The given queue is retained by the system for the lifetime of the notification. Use notify_cancel() to release the notification and its reference to the queue. notify_register_signal registers a client for notification delivery via a signal. This fits well with the design of many UNIX daemons that use a signal such as SIGHUP to reinitialize of reset internal state information. notify_register_mach_port registers a client for notification delivery via mach messaging. Notifications are delivered by an empty message sent to a mach port. By default, a new port is created by a call to this routine. A mach port previously created by a call to this routine may be used for notifica- tions if a pointer to that port is passed in to the routine and NOTIFY_REUSE is set in the flags parameter. The notification service must be able to extract send rights to the port. Values for the flags parameter may only be 0 (zero) or NOTIFY_REUSE. Note that the kernel limits the size of the message queue for any port. If it is important that notifications should not be lost due to queue overflow, clients should service messages quickly, and be cautious in using the same port for notifications for more than one name. A notification message has an empty message body. The msgh_id field in the mach message header will have the value of the notification token. If a port is reused for multiple notification registrations, the msgh_id value may be used to determine which name generated the notification. notify_register_file_descriptor Register for notification by a write to a file descriptor. By default, a new file descriptor is created and a pointer to it is returned as the value of the "notify_fd" parameter. A file descriptor created by a previous call to this routine may be used for notifications if a pointer to that file descriptor is passed in to the routine and NOTIFY_REUSE is set in the flags parameter. Values for the flags parameter may only be 0 (zero) or NOTIFY_REUSE. Note that the kernel limits the buffer space for queued writes on a file descriptor. If it is important that notifications should not be lost due to queue overflow, clients should service messages quickly, and be cautious in using the same file descriptor for notifications for more than one name. Notifications are delivered by an integer value written to the file descriptor. The value is sent in network byte order. When converted to host byte order, for example by using ntohl(), it will match the notification token for which the notification was generated. notify_check Checks if any notifications have been posted for a name. The output parameter "check" is set to 0 for false, 1 for true. A true indication is returned the first time notify_check is called for a token. Subsequent calls give a true indication when notifications have been posted for the name associated with the notification token. notify_check() may be used with any notification token produced by any of the notification registration routines. A fast check based on a shared memory implementation is used when the token was generated by notify_register_check(). Other tokens are checked by a call to the notification server. notify_set_state Set a 64-bit unsigned integer variable associated with a token. Each registered notification key has an associated 64-bit integer variable, which may be set using this routine and examined using the notify_get_state() routine. The state variable is free to be used by clients of the notification API. It may be used to synchronize state information between cooperating processes or threads. (Available in Mac OS X 10.5 or later.) notify_get_state Get the 64-bit unsigned integer value associated with a token. The default value of a state variable is zero. (Available in Mac OS X 10.5 or later.) notify_suspend Suspends delivery of notifications for a notification token. Any notifications corresponding to a token that are posted while it is sus- pended will be coalesced, and pended until notifications are resumed using notify_resume(). Calls to notify_suspend() may be nested. Notifications will resume only when a matching number of calls are made to notify_resume(). notify_resume Removes one level of suspension for a token previously suspended by a call to notify_suspend(). When resumed, notifications will be deliv- ered normally. A single notification will be generated if any notifications were pended while the token was suspended. notify_cancel Cancel notification and free resources associated with a notification token. Mach ports and file descriptor associated with a token are released (deallocated or closed) when all registration tokens associated with the port or file descriptor have been cancelled. notify_is_valid_token Determines if an integer value is valid for a current registration. Negative integers are never valid. A positive or zero value is valid if the current process has a registration associated with the given value. NAMESPACE CONVENTIONS
Names in the namespace must be NULL-terminated. Names should be encoded as UTF-8 strings. The namespace supported by the system is unstructured, but users of this API are highly encouraged to follow the reverse-ICANN domain name convention used for Java package names and for System Preferences on Mac OS X. For example, "com.mydomain.example.event". Apple reserves the portion of the namespace prefixed by "com.apple.". This policy is not enforced in the current implementation, but may be in the future. Names in the space "user.uid.UID", where UID is a numeric user ID number are reserved for processes with that UID. Names in this protected space may only be accessed or modified by processes with the effective UID specified as the UID in the name. The name "user.uid.UID" is pro- tected for the given UID, as are any names of the form "user.uid.UID.<sub-path>". In the latter case, the name must have a dot character following the UID. Third party developers are encouraged to choose a prefix for names that will avoid conflicts in the shared namespace. The portion of the namespace prefixed by the string "self." is set aside for private use by applications. That is, each client may use that part of the namespace for intra-process notifications. These notifications are private to each individual process and are not propagated between processes. USAGE EXAMPLES
A notification producer. #include <notify.h> ... notify_post("com.eg.random.event"); A client using notify_check() to determine when to invalidate a cache. #include <stdio.h> #include <stdlib.h> #include <notify.h> int main(int argc, char *argv[]) { uint32_t status; int token, check; status = notify_register_check("com.eg.update", &token); if (status != NOTIFY_STATUS_OK) { fprintf(stderr, "registration failed (%u) ", status); exit(status); } build_my_cache(); ... status = notify_check(token, &check); if ((status == NOTIFY_STATUS_OK) && (check != 0)) { /* An update has occurred - invalidate the cache */ reset_my_cache(); } ... A client using file descriptor notifications. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <sys/types.h> #include <sys/time.h> #include <unistd.h> #include <notify.h> int main(int argc, char *argv[]) { uint32_t status; int nf, rtoken, qtoken, t, ret; fd_set readfds; status = notify_register_file_descriptor("com.eg.random.event", &nf, 0, &rtoken); if (status != NOTIFY_STATUS_OK) { fprintf(stderr, "registration failed (%u) ", status); exit(status); } status = notify_register_file_descriptor("com.eg.random.quit", &nf, NOTIFY_REUSE, &qtoken); if (status != NOTIFY_STATUS_OK) { fprintf(stderr, "registration failed (%u) ", status); exit(status); } FD_ZERO(&readfds); FD_SET(nf, &readfds); for (;;) { ret = select(nf+1, &readfds, NULL, NULL, NULL); if (ret <= 0) continue; if (!FD_ISSET(nf, &readfds)) continue; status = read(nf, &t, sizeof(int)); if (status < 0) { perror("read"); break; } t = ntohl(t); if (t == rtoken) printf("random event "); else if (t == qtoken) break; } printf("shutting down "); notify_cancel(rtoken); notify_cancel(qtoken); exit(0); } A client using dispatch notifications. #include <stdio.h> #include <stdlib.h> #include <notify.h> #include <dispatch/dispatch.h> int main(void) { uint32_t status; int token; status = notify_register_dispatch("com.eg.random.event", &token, dispatch_get_main_queue(), ^(int t) { printf("com.eg.random.event received! "); }); dispatch_main(); exit(0); } HISTORY
These functions first appeared in Mac OS X 10.3. SEE ALSO
ntohl(3), read(2), select(2), signal(3) Mac OS X September 3, 2008 Mac OS X

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