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8151264: Add a notification mechanism for UL configuration changes

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Reviewed-by: dholmes, mlarsson
This commit is contained in:
Robbin Ehn 2016-03-08 08:54:05 +01:00
parent 46da2cd7f3
commit c75117cf29
4 changed files with 68 additions and 2 deletions
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23
hotspot/src/share/vm/logging/logConfiguration.cpp
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@ -40,6 +40,9 @@
LogOutput** LogConfiguration::_outputs = NULL;
size_t LogConfiguration::_n_outputs = 0;
LogConfiguration::UpdateListenerFunction* LogConfiguration::_listener_callbacks = NULL;
size_t LogConfiguration::_n_listener_callbacks = 0;
// Stack object to take the lock for configuring the logging.
// Should only be held during the critical parts of the configuration
// (when calling configure_output or reading/modifying the outputs array).
@ -254,6 +257,7 @@ void LogConfiguration::disable_logging() {
for (size_t i = 0; i < _n_outputs; i++) {
disable_output(i);
}
notify_update_listeners();
}
void LogConfiguration::configure_stdout(LogLevelType level, bool exact_match, ...) {
@ -282,6 +286,7 @@ void LogConfiguration::configure_stdout(LogLevelType level, bool exact_match, ..
// Apply configuration to stdout (output #0), with the same decorators as before.
ConfigurationLock cl;
configure_output(0, expr, LogOutput::Stdout->decorators());
notify_update_listeners();
}
bool LogConfiguration::parse_command_line_arguments(const char* opts) {
@ -373,6 +378,7 @@ bool LogConfiguration::parse_log_arguments(const char* outputstr,
}
}
configure_output(idx, expr, decorators);
notify_update_listeners();
return true;
}
@ -471,3 +477,20 @@ void LogConfiguration::rotate_all_outputs() {
}
}
void LogConfiguration::register_update_listener(UpdateListenerFunction cb) {
assert(cb != NULL, "Should not register NULL as listener");
ConfigurationLock cl;
size_t idx = _n_listener_callbacks++;
_listener_callbacks = REALLOC_C_HEAP_ARRAY(UpdateListenerFunction,
_listener_callbacks,
_n_listener_callbacks,
mtLogging);
_listener_callbacks[idx] = cb;
}
void LogConfiguration::notify_update_listeners() {
assert(ConfigurationLock::current_thread_has_lock(), "notify_update_listeners must be called in ConfigurationLock scope (lock held)");
for (size_t i = 0; i < _n_listener_callbacks; i++) {
_listener_callbacks[i]();
}
}