darkstar处理超时，分解Task的方案！（2）

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#2010 #exception #properties #class #null #application

本文介绍了一个并发任务调度的实现方式，通过创建多个任务实例并将其组织为层级结构来实现任务的并发执行。每个任务包含子任务，任务实例间通过引用管理相互依赖的任务，确保任务按顺序执行。此外，利用日志记录了任务执行的详细过程，包括开始、结束时间及任务名称，以直观展示任务执行情况。

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package cn.vicky.sgs.app; import java.io.Serializable; import java.util.Properties; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import cn.vicky.sgs.mo.Counter; import cn.vicky.sgs.task.BaseTask; import cn.vicky.sgs.task.impl.TestTask; import com.sun.sgs.app.AppContext; import com.sun.sgs.app.AppListener; import com.sun.sgs.app.ClientSession; import com.sun.sgs.app.ClientSessionListener; import com.sun.sgs.app.NameNotBoundException; import com.sun.sgs.app.util.ScalableList; public class MainApp implements AppListener, Serializable { private static final long serialVersionUID = 1L; private static final Logger logger = LoggerFactory.getLogger(MainApp.class); public void initialize(Properties properties) { logger.info("initialize begin ... "); long time1 = System.currentTimeMillis(); ScalableList<BaseTask> testTasks = new ScalableList<BaseTask>(); // 一个任务需要执行的子任务 ... testTasks.add(new TestTask()); testTasks.add(new TestTask()); testTasks.add(new TestTask()); testTasks.add(new TestTask()); testTasks.add(new TestTask()); class NewTask extends BaseTask{ private static final long serialVersionUID = 1L; public NewTask() { } public NewTask(ScalableList<BaseTask> subTasks) { super(subTasks); } public void run() throws Exception { long time1 = System.currentTimeMillis(); doSubTask(); long id = 0; Counter counter = null; try { counter = (Counter) AppContext.getDataManager().getBinding("id"); } catch (NameNotBoundException e) { AppContext.getDataManager().setBinding("id", new Counter()); counter = (Counter) AppContext.getDataManager().getBinding("id"); } id = counter.next(); logger.info("Done ~ " + id); logger.info(" NewTask 1 "); long time2 = System.currentTimeMillis(); logger.info("last for " + (time2 - time1) + " ms!"); } } class NewTask2 extends BaseTask{ private static final long serialVersionUID = 1L; public NewTask2() { } public NewTask2(ScalableList<BaseTask> subTasks) { super(subTasks); } public void run() throws Exception { long time1 = System.currentTimeMillis(); doSubTask(); long id = 0; Counter counter = null; try { counter = (Counter) AppContext.getDataManager().getBinding("id"); } catch (NameNotBoundException e) { AppContext.getDataManager().setBinding("id", new Counter()); counter = (Counter) AppContext.getDataManager().getBinding("id"); } id = counter.next(); logger.info("Done ~ " + id); logger.info(" NewTask 2 "); long time2 = System.currentTimeMillis(); logger.info("last for " + (time2 - time1) + " ms!"); } } class NewTask3 extends BaseTask{ private static final long serialVersionUID = 1L; public NewTask3() { } public NewTask3(ScalableList<BaseTask> subTasks) { super(subTasks); } public void run() throws Exception { long time1 = System.currentTimeMillis(); doSubTask(); long id = 0; Counter counter = null; try { counter = (Counter) AppContext.getDataManager().getBinding("id"); } catch (NameNotBoundException e) { AppContext.getDataManager().setBinding("id", new Counter()); counter = (Counter) AppContext.getDataManager().getBinding("id"); } id = counter.next(); logger.info("Done ~ " + id); logger.info(" NewTask 3 "); long time2 = System.currentTimeMillis(); logger.info("last for " + (time2 - time1) + " ms!"); } } class NewTask4 extends BaseTask{ private static final long serialVersionUID = 1L; public NewTask4() { } public NewTask4(ScalableList<BaseTask> subTasks) { super(subTasks); } public void run() throws Exception { long time1 = System.currentTimeMillis(); doSubTask(); long id = 0; Counter counter = null; try { counter = (Counter) AppContext.getDataManager().getBinding("id"); } catch (NameNotBoundException e) { AppContext.getDataManager().setBinding("id", new Counter()); counter = (Counter) AppContext.getDataManager().getBinding("id"); } id = counter.next(); logger.info("Done ~ " + id); logger.info(" NewTask 4 "); long time2 = System.currentTimeMillis(); logger.info("last for " + (time2 - time1) + " ms!"); } } ScalableList<BaseTask> testTasks2 = new ScalableList<BaseTask>(); testTasks2.add(new NewTask2()); ScalableList<BaseTask> testTasks3 = new ScalableList<BaseTask>(); testTasks3.add(new TestTask()); testTasks3.add(new TestTask()); testTasks3.add(new TestTask()); testTasks2.add(new NewTask3(testTasks3)); testTasks2.add(new NewTask4()); testTasks.add(new NewTask(testTasks2)); testTasks.add(new TestTask()); testTasks.add(new TestTask()); testTasks.add(new TestTask()); AppContext.getTaskManager().scheduleTask(new TestTask(testTasks)); long time2 = System.currentTimeMillis(); logger.info("************** last for " + (time2 - time1) + " ms ***************"); logger.info("initialize over ... "); } public ClientSessionListener loggedIn(ClientSession clientsession) { return null; } }

package cn.vicky.sgs.task; import java.io.Serializable; import com.sun.sgs.app.AppContext; import com.sun.sgs.app.ManagedReference; import com.sun.sgs.app.Task; import com.sun.sgs.app.util.ScalableList; public abstract class BaseTask implements Task, Serializable { private static final long serialVersionUID = 1L; private ManagedReference<ScalableList<BaseTask>> subTasksRef; public BaseTask() { } public BaseTask(ScalableList<BaseTask> subTasks) { subTasksRef = AppContext.getDataManager().createReference(subTasks); } public void doSubTask() { if (subTasksRef != null && subTasksRef.get() != null) { BaseTask task = null; try { task = subTasksRef.getForUpdate().remove(0); } catch (IndexOutOfBoundsException e) { } if (task != null) { if (task.getSubTasksRef() != null && task.getSubTasksRef().get() != null && task.getSubTasksRef().get().size() > 0) { subTasksRef.get().addAll(0,task.getSubTasksRef().get()); } task.setSubTasksRef(subTasksRef); AppContext.getTaskManager().scheduleTask(task); } } } public void setSubTasksRef(ManagedReference<ScalableList<BaseTask>> subTasksRef) { this.subTasksRef = subTasksRef; } public ManagedReference<ScalableList<BaseTask>> getSubTasksRef() { return subTasksRef; } }

其他参见：darkstar处理超时，分解Task的方案！

输出

2010-4-13 16:52:37 com.sun.sgs.impl.kernel.Kernel <init> 信息: The Kernel is ready, version: 0.9.11 2010-4-13 16:52:37 com.sun.sgs.impl.service.data.store.DataStoreImpl <init> 信息: Creating database directory : G:/学习/SubTask/data/MainApp/dsdb 2010-4-13 16:52:42 com.sun.sgs.impl.service.watchdog.WatchdogServerImpl registerNode 信息: node:com.sun.sgs.impl.service.watchdog.NodeImpl[1,health:GREEN,backup:(none)]@12D5D97FF9764F4 registered [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - initialize] - initialize begin ... [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - initialize] - ************** last for 0 ms *************** [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - initialize] - initialize over ... 2010-4-13 16:52:43 com.sun.sgs.impl.kernel.Kernel startApplication 信息: MainApp: application is ready [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 1 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 16 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 2 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 3 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 4 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 16 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 5 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 6 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 16 ms! [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - Done ~ 7 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - NewTask 1 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - Done ~ 8 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - NewTask 2 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - Done ~ 9 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - NewTask 3 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - last for 15 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 10 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 11 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 16 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 12 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - Done ~ 13 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - NewTask 4 [2010-04-13 16:52:43][cn.vicky.sgs.app.MainApp - run] - last for 16 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 14 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 0 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 15 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 15 ms! [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - Done ~ 16 [2010-04-13 16:52:43][cn.vicky.sgs.task.impl.TestTask - run] - last for 0 ms!