109 lines
2.8 KiB
Text
109 lines
2.8 KiB
Text
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# events.nas - Generic objects for managing events
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#
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# Copyright (C) 2014 Anton Gomez Alvedro
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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# The EventDispatcher is a simple helper object that keeps a list of listeners
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# and allows a calling entity to send an "event" object to all subscribers.
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#
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# It is intended to be used internally by modules that want to offer a
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# subscription interface so other modules can receive notifications.
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# For an example of how to use it this way, check Nasal/FailureMgr
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var EventDispatcher = (func {
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var global_id = 0;
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var getid = func { global_id += 1 };
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return {
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new: func {
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var m = { parents: [EventDispatcher] };
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m._subscribers = {};
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return m;
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},
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notify: func(event) {
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foreach(var id; keys(me._subscribers))
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me._subscribers[id](event);
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},
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subscribe: func(callback) {
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assert(typeof(callback) == "func");
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var id = getid();
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me._subscribers[id] = callback;
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return id;
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},
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unsubscribe: func(id) {
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delete(me._subscribers, id);
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}
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};
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})();
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##
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# Stores messages in a circular buffer that then can be retrieved at any point.
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# Messages are time stamped when pushed into the buffer, and the time stamp is
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# kept by the message.
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var LogBuffer = {
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new: func (max_messages = 128, echo = 0) {
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assert(max_messages > 1, "come on, lets be serious..");
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var m = { parents: [LogBuffer] };
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m.echo = echo;
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m.max_messages = max_messages;
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m.buffer = setsize([], max_messages);
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m.full = m.wp = 0;
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return m;
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},
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push: func(message) {
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var stamp = getprop("/sim/time/gmt-string");
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if (me.echo) print(stamp, " ", message);
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me.buffer[me.wp] = { time: stamp, message: message };
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me.wp += 1;
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if (me.wp == me.max_messages) {
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me.wp = 0;
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me.full = 1;
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}
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},
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clear: func {
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me.full = me.wp = 0;
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},
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##
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# Returns a vector with all messages, starting with the oldest one.
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# Each vector entry is a hash with the format:
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# { time: <timestamp_str>, message: <the message> }
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get_buffer: func {
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if (me.full)
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!me.wp ? me.buffer : me.buffer[me.wp:-1] ~ me.buffer[0:me.wp-1];
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elsif (me.wp == 0)
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[];
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else
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me.buffer[0:me.wp-1];
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}
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};
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