SqlWorkflowInstanceStore可以为我做什么?

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问题描述

问候，

(1)如何从存储中获取所有持久化实例，哪一个准备好加载并运行了吗?我有三个这样的实例，但是WaitForEvents()总是只给我一个实例，尽管该方法返回的是List< InstancePersistenceEvent>. 这就是我所拥有的:

(1) How can I get all persisted instances from the store, which are ready to be loaded and run? I have three instances like that, but WaitForEvents() always gets me just one, although the method returns a List<InstancePersistenceEvent>. This is what I have:

List< Guid> readyToRun =新列表< Guid>();

List<Guid> readyToRun = new List<Guid>();

           bool timeout = false;
           试试
            {
                List< InstancePersistenceEvent> events = _wfstore.WaitForEvents(_wfh，TimeSpan.FromSeconds(5));
                foreach(事件中的InstancePersistenceEvent evt)
                {
                   如果(evt == HasRunnableWorkflowEvent.Value)
                    {
                        TryLoadRunnableWorkflowCommand cmd =新的TryLoadRunnableWorkflowCommand();
                        InstanceView iview = _wfstore.Execute(_wfh，cmd，TimeSpan.FromSeconds(5));
                        readyToRun.Add(iview.InstanceId);
                    }
                   否则，如果(evt是HasActivatableWorkflowEvent)
                    {
                    }
                }
            }
           捕获(TimeoutException)
            {
               返回Guid.Empty;
            }

            bool timeout = false;
            try
            {
                List<InstancePersistenceEvent> events = _wfstore.WaitForEvents(_wfh, TimeSpan.FromSeconds(5));
                foreach (InstancePersistenceEvent evt in events)
                {
                    if (evt == HasRunnableWorkflowEvent.Value)
                    {
                        TryLoadRunnableWorkflowCommand cmd = new TryLoadRunnableWorkflowCommand();
                        InstanceView iview = _wfstore.Execute(_wfh, cmd, TimeSpan.FromSeconds(5));
                        readyToRun.Add(iview.InstanceId);
                    }
                    else if (evt is HasActivatableWorkflowEvent)
                    {
                    }
                }
            }
            catch (TimeoutException)
            {
                return Guid.Empty;
            }

WaitForEvents()是否会返回多个?在什么情况下?然后，具有多个事件与TryLoadRunnableWorkflowCommand检索单个InstanceView有何关系?

Will WaitForEvents() ever return more than one? Under what scenario? And then, how having multiple events relates to the TryLoadRunnableWorkflowCommand retrieving a single InstanceView?

我的假设是WaitForEvents()返回单个持久化实例的事件，因此我必须将以上内容放入循环中以获取所有事件.请确认.

My assumption is that WaitForEvents() returns events for a single persisted instance, so I have to put the above in a loop to get them all. Please confirm.

另外，实例被拿起的顺序是什么?我对此有话要说吗?

Also, what's the order the instances get picked up? Do I have any say in this?

(2)现在，我有了一个InstanceView，如何从中确定要使用哪个工作流程定义(活动)，以便可以实例化它的WorkflowApplication(活动)，Load()和Run()?我是否在Activity及其所有正在运行的实例之间保留自己的映射?

(2) Now that I have an InstanceView, how do I figure from it which workflow definition (Activity) to use so I can instantiate a WorkflowApplication(Activity), Load() and Run() it? Do I keep my own mapping between an Activity and all of its running instances?

(3)如何使用InstanceHandle?它具有Free()方法.我什么时候必须/应该/可以打电话给它?在获取可运行实例的上述代码之后，我必须调用_wfh.Free()，否则我的WorkflowApplication对象上的Load()会失败，并带有InstanceHandleConflictException ("InstancePersistenceCommand的执行被中断，因为另一个有效的InstanceHandle持有实例'bbf4ad46-62be-421d-bfb3-db051c49ad84'的锁，表明该实例的非陈旧副本已被加载.加载的副本实例及其关联的InstanceHandle的实例应该被使用或卸载.")

(3) How do I use the InstanceHandle? It has a Free() method. When must/should/may I call it? After the above code for getting a runnable instance I have to call _wfh.Free(), otherwise my Load() on the WorkflowApplication object fails with InstanceHandleConflictException ("The execution of an InstancePersistenceCommand was interrupted because another valid InstanceHandle holds a lock on instance 'bbf4ad46-62be-421d-bfb3-db051c49ad84', indicating that a non-stale copy of the instance is already loaded. The loaded copy of the instance and its associated InstanceHandle should be used or unloaded.")

(4)我可以为我的所有持久性存储需求重用一个SqlWorkflowInstanceStore实例-所有WorkflowApplication实例，任何InstancePersistenceCommand-s Execute()等.

(4) Can I reuse a single SqlWorkflowInstanceStore instance for all my persistence store needs - all WorkflowApplication instances, any InstancePersistenceCommand-s I Execute(), etc.

谢谢！

tjk:)

readyToRun

SqlWorkflowInstanceStore可以为我做什么?

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