priority-queue

I have a server application which accepts incomming queries and executes them. If there are too many queries they should be queued and if some of the other queries got executed the queued queries should be executed as well. Since I want to pass queries with different priorities I think using a priority_queue would be the best choice. e.g. The amout of the axcepting queries (a) hit the limt and new queries will be stored in the queue. All queries have a priority of 1 (lowest) if some of the queries from (a) get executed the programm will pick the query with the highest priority out of the queue

I'm initialising a Priority Queue like: strategy = new FuelPriority(); incoming = new PriorityQueue<Vehicle>(1, strategy); The code for my Comparator class is: public class FuelPriority implements Comparator<Object> { public int compare(Object o1, Object o2) { Vehicle a1 = (Vehicle) o1; Vehicle a2 = (Vheicle) o2; return Integer.compare(a1.getFuelLevel(), a2.getFuelLevel()); } } After running a simulation, the elements aren't ordered at all - they are random; I set a breakpoint in the compare method of my FuelPriority class, but it wasn't called at all. Am I missing something here? Aside from

I have been working on dijkstra's algorithm for the past one week one I have the correct running code for it in java. It is using array for the computation of standard findMin function which gives you the vertex with smallest distance.Obviously it is O(n) and Now I am looking to implement it using Priority Queue(Min Heaps) What My thought process is: while (there are unseen Vertex) { vertex= get TheVertex WithSmallest Distance Yet;//(In can be done in O(log n) using heap) for this vertex { find all of the adjacent edges and traverse them. for a particular vertex which is not there in heap yet{

I want to schedule or queue to execute Multiple AsyncTask in background. I have a AsyncTask for HTTP post request that is running in Service, At the same time i make a one more HTTP request in UI thread of AsyncTask. UI thread taking too long time to execute, because already one thread is running in service. How to resolve this problem.? I need to Pause a service thread and I want to execute UI thread first and then restart a service thread again for AsyncTask. Thanks in advance atok As AsyncTasks can share a single thread I would try decoupling them by calling: my_task.executeOnExecutor

Priority receive in Erlang can easily be implemented as follows: prio() -> receive {priority, X} -> X after 0 -> receive X -> X end end. I am reading a paper called Priority Messaging made Easy in which they describe the following problem: The main problem with the [code] example [above], is that we do not take into consideration that when evaluation is resumed from the inner blocking receive we may have more than one message in the mailbox. In a worst case scenario, all but the first, of potentially a huge number, of elements could be priority messages. In this scenario we would actually have

Vectors and Linked Lists Vectors are stored in memory serially, and therefore any element may be accessed using the operator[] , just as in an array. A linked list contains elements which may not be stored continuously in memory, and therefore a random element must be accessed by following pointers, using an iterator. (You probably already knew this.) Advantage of Priority Que Recently I discovered the 'priority queue', which works kind of like a stack, but elements are push() -ed into the container, and this function places them in an order according to comparisons made with the operator< , I