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  • Representing and executing simple rules - framework or custom?

    - by qtips
    I am creating a system where users will be able to subscribe to events, and get notified when the event has occured. Example of events can be phone call durations and costs, phone data traffic notations, and even stock rate changes. Example of events: customer 13532 completed a call with duration 11:45 min and cost $0.4 stock rate for Google decreased with 0.01% Customers can subscribe to events using some simple rules e.g. When stock rate of Google decreases more than 0.5% When the cost of a call of my subscription is over $1 Now, as the set of different rules is currently predefined, I can easily create a custom implemention that applies rules to an event. But if the set of rules could be much larger, and if we also allow for custom rules (e.g. when stock rate of Google decreses more than 0.5% AND stock rate of Apple increases with 0.5%), the system should be able to adapt. I am therefore thinking of a system that can interpret rules using a simple grammer and then apply them. After som research I found that there exists rule-based engines that can be used, but I am unsure as they seem too complicated and may be a little overkill for my situation. Is there a Java framework suited for this area? Should we use framework, a rule engine, or should we create something custom? What are the pros and cons?

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  • Get notified/receive explicit intents when an activity starts

    - by qtips
    Hi, I am developing an application than gets notified when an activity chosen by a user is started. For this to work, the best approach would be to register a broadcastreceiver for ACTION_MAIN explicit intents, which as far as I know doesn't work (because these intents have specific targets). Another, probably less efficient approach, is to use the system ActivityManager and poll on the getRunningTask() which returns a list of all running tasks at the moment. The polling can be done by a background service. By monitoring the changes in this list, I can see whether an activity is running or not, so that my application can get notified. The downside is ofcourse the polling. I have not tried this yet, but I think that this last approach will probably work. Does anyone know of a better approach(es) or suggestions which are less intensive?

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  • What is the best way to wait for a GPS location fix?

    - by qtips
    Hi, Using my Android application, when a user does a certain action, a background service is started that fetches the current GPS location and saves it in a database in addition of doing some other stuff. In that service, I use the requestLocationUpdates() from the LocationManager class and wait until the onLocationChanged() of my LocationListener (which is implemented by the service) is fired. But what is the best way to wait for the onLocationChanged to fire? Should I simply poll on a variable and wait until it is set? Any tips? Note: I cannot simply write to the database in the onLocationChanged() because of some other stuff. EDIT: To clearfy my situation, I can present an example similar to my case: Let's say user pushes a button and a method myMethod is fired which will return some object. Then, in this myMethod I will register for location updates from the GPS (using requestLocationChanged) and in addition wait for the users location and use it for something. In other words, myMethod cannot return before the location is present. I don't know how I can use onLocationChanged in this case.

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  • jQuery Selectors: how to access an a tag, whose span has a specific class?

    - by Paul
    I'm messing around with FullCalendar jQuery calendar, and qTips, so that I can display more information about the event upon mouseover. I've added a summary element to the FullCalendar js, and also my server code. I then added a new qTip in the eventMouseover method, based on the span class, which works prefectly. However, if the event stretches over a couple of days, the qTip only works (because it is a span tag), on the text itself, not the entire blue strip. What I want to do is to assign the qTip to the a tag, and make the a tags display block. This works currently: eventMouseover: function(event){ $('span[class=fc-event-title]').each(function() { if( $(this).text() == event.title ) { $(this).qtip({ content: event.summary, style: { border: { width: 1, radius: 5, color: '#6699CC' }, width: 200 } }); } }); but I can't figure out how to select the a tag where it contains a span with class of fc-event-title. Many thanks for any assistance.

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