| 1 | package felix.society; |
| 2 | |
| 3 | import java.util.ArrayList; |
| 4 | import java.util.concurrent.ExecutorService; |
| 5 | import java.util.concurrent.Executors; |
| 6 | import java.util.concurrent.Future; |
| 7 | |
| 8 | /** |
| 9 | * A concurrent task. |
| 10 | * @author czhang |
| 11 | * |
| 12 | */ |
| 13 | public abstract class Task { |
| 14 | |
| 15 | /** |
| 16 | * Number of runs of this task. |
| 17 | */ |
| 18 | private int nRuns = 1; |
| 19 | |
| 20 | /** |
| 21 | * Type of task \in {TASKSET, TASKLIST, TASK} |
| 22 | * @author czhang |
| 23 | * |
| 24 | */ |
| 25 | public static enum TaskType {TASKSET, TASKLIST, TASK} |
| 26 | |
| 27 | /** |
| 28 | * A thread poll that only contains very very cheap threads (to |
| 29 | * support TaskSet > TaskList1, TaskList2 structure) |
| 30 | */ |
| 31 | public static ExecutorService softpool = Executors.newFixedThreadPool(1000); |
| 32 | |
| 33 | /** |
| 34 | * Type of this task. |
| 35 | */ |
| 36 | private TaskType type; |
| 37 | |
| 38 | /** |
| 39 | * If this task is a task list or task set, all subtasks. |
| 40 | */ |
| 41 | ArrayList<Task> subTasks = new ArrayList<Task>(); |
| 42 | |
| 43 | /** |
| 44 | * What worker is currently running? |
| 45 | */ |
| 46 | public Worker currentWorker = null; |
| 47 | |
| 48 | /** |
| 49 | * What future is currently running (used for join). |
| 50 | */ |
| 51 | public Future currentFuture = null; |
| 52 | |
| 53 | /** |
| 54 | * The constructor. |
| 55 | * @param _type |
| 56 | */ |
| 57 | public Task(TaskType _type){ |
| 58 | type = _type; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * |
| 63 | * @return |
| 64 | */ |
| 65 | public TaskType getType(){ |
| 66 | return type; |
| 67 | } |
| 68 | |
| 69 | public Task(TaskType _type, Integer _nRuns){ |
| 70 | type = _type; |
| 71 | nRuns = _nRuns; |
| 72 | } |
| 73 | |
| 74 | public void addSubTask(Task _task){ |
| 75 | this.subTasks.add(_task); |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * Execute this task. |
| 80 | * |
| 81 | * @param pool The thread pool |
| 82 | * @throws Exception |
| 83 | */ |
| 84 | public void execute(ExecutorService pool) throws Exception{ |
| 85 | |
| 86 | for(int i=0;i<nRuns;i++){ |
| 87 | if(this.type == TaskType.TASK){ |
| 88 | currentWorker = this.generateWorker(); |
| 89 | currentFuture = pool.submit(currentWorker); |
| 90 | currentFuture.get(); |
| 91 | }else{ |
| 92 | currentWorker = this.generateWorker(pool); |
| 93 | currentFuture = softpool.submit(currentWorker); |
| 94 | currentFuture.get(); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Generate worker for TASK (threads). |
| 102 | * @return |
| 103 | */ |
| 104 | public abstract Worker generateWorker(); |
| 105 | |
| 106 | /** |
| 107 | * Generate worker for TASKLIST, TASKSET (threads). |
| 108 | * @param pool The thread pool in which subtasks will run. |
| 109 | * @return |
| 110 | */ |
| 111 | public abstract Worker generateWorker(ExecutorService pool); |
| 112 | |
| 113 | |
| 114 | |
| 115 | |
| 116 | } |