public static Invoker Create(Guid instanceId)
{
// workflow runtime core
WorkflowRuntime workflowRuntime = WorkflowHosting.WorkflowRuntime;
// Get a reference to the ExternalDataExchangeService from the WorkflowRuntime
ExternalDataExchangeService dataExchangeService = workflowRuntime.GetService <ExternalDataExchangeService>();
// Get a reference to the LocalService
InvokerLocalService invokerLocalService = (InvokerLocalService)dataExchangeService.GetService(typeof(InvokerLocalService));
// get instance of the workflow
WorkflowInstance instance = workflowRuntime.GetWorkflow(instanceId);
try
{
// workaround to detect WorkflowStatus, if the status == Created, the executor will start this instance
instance.Start();
}
catch (Exception ex)
{
// WorkflowStatus != Created (therefore we can go ahead and use it)
Trace.WriteLine(ex.Message);
}
// plug-in the local service
Invoker invoker = new Invoker(invokerLocalService, instance, true);
// now we can communicate with workflow instance
return(invoker);
}
public Invoker(InvokerLocalService localservice, WorkflowInstance instance, bool bStateMachine)
{
_instance = instance;
_localservice = localservice;
_bStateMachine = bStateMachine;
// response handler
_localservice.Response += new EventHandler <ResponseEventArgs>(localservice_FireResponse);
// exception handlers
_localservice.WorkflowRuntime.WorkflowTerminated += new EventHandler <WorkflowTerminatedEventArgs>(OnWorkflowTerminated);
_localservice.WorkflowRuntime.WorkflowSuspended += new EventHandler <WorkflowSuspendedEventArgs>(OnWorkflowSuspended);
// completed handler
_localservice.WorkflowRuntime.WorkflowCompleted += new EventHandler <WorkflowCompletedEventArgs>(OnWorkflowCompleted);
}
public static Invoker Create(Type workflowType, Dictionary <string, object> namedArgumentValues, Guid instanceId, bool bStart)
{
if (workflowType == null)
{
throw new ArgumentNullException("Invoker requires a workflowType");
}
// state machine?
bool isStateMachine = (workflowType.BaseType == typeof(StateMachineWorkflowActivity));
// workflow runtime core
WorkflowRuntime workflowRuntime = WorkflowHosting.WorkflowRuntime;
// Get a reference to the ExternalDataExchangeService from the WorkflowRuntime
ExternalDataExchangeService dataExchangeService = workflowRuntime.GetService <ExternalDataExchangeService>();
// Get a reference to the LocalService
InvokerLocalService invokerLocalService = (InvokerLocalService)dataExchangeService.GetService(typeof(InvokerLocalService));
// check XOML attribute
object[] attributes = workflowType.GetCustomAttributes(typeof(CreateWorkflowByXOMLAttribute), true);
// create workflow instance based on the configuration options
WorkflowInstance instance = null;
if (attributes == null || attributes.Length == 0)
{
// default: create instance of the workflow
instance = workflowRuntime.CreateWorkflow(workflowType, namedArgumentValues, instanceId);
}
else
{
// options: direct from the file system or via a custom XomlLoader (database, filesystem, remoting, ...)
CreateWorkflowByXOMLAttribute attribute = attributes[0] as CreateWorkflowByXOMLAttribute;
try
{
// sources link
string workflowDefinitionSource = attribute.WorkflowDefinitionKey.StartsWith("@") ? ConfigurationManager.AppSettings[attribute.WorkflowDefinitionKey.Substring(1)] : attribute.WorkflowDefinitionKey;
string rulesSource = attribute.RulesKey.StartsWith("@") ? ConfigurationManager.AppSettings[attribute.RulesKey.Substring(1)] : attribute.RulesKey;
// text readers
bool bIsXomlLoader = workflowType.GetInterface(typeof(IXomlLoader).FullName) != null;
if (bIsXomlLoader)
{
IXomlLoader loader = Activator.CreateInstance(workflowType) as IXomlLoader;
using (Stream xomlStream = loader.GetWorkflowDefinition(workflowDefinitionSource, namedArgumentValues))
using (Stream rulesStream = loader.GetWorkflowRules(rulesSource, namedArgumentValues))
using (XmlTextReader xomlReader = xomlStream == null ? null : new XmlTextReader(xomlStream))
using (XmlTextReader rulesReader = rulesStream == null ? null : new XmlTextReader(rulesStream))
{
instance = workflowRuntime.CreateWorkflow(xomlReader, rulesReader, null, instanceId);
}
}
else
{
using (XmlTextReader xomlReader = string.IsNullOrEmpty(workflowDefinitionSource) ? null : new XmlTextReader(workflowDefinitionSource))
using (XmlTextReader rulesReader = string.IsNullOrEmpty(rulesSource) ? null : new XmlTextReader(rulesSource))
{
instance = workflowRuntime.CreateWorkflow(xomlReader, rulesReader, null, instanceId);
}
}
}
catch (WorkflowValidationFailedException ex)
{
string errMsg = string.Format("{0} {1} TotalErrors={2}", ex.Message, ex.Errors[0].ErrorText, ex.Errors.Count);
ex.GetType().BaseType.InvokeMember("_message", BindingFlags.SetField | BindingFlags.NonPublic | BindingFlags.ExactBinding | BindingFlags.FlattenHierarchy | BindingFlags.Instance, null, ex, new object[1] {
errMsg
}, CultureInfo.InvariantCulture);
throw ex;
}
catch (Exception ex)
{
throw ex;
}
}
// start workflow
if (bStart)
{
instance.Start();
}
// plug-in the local service
Invoker invoker = new Invoker(invokerLocalService, instance, isStateMachine);
// now we can communicate with workflow instance
return(invoker);
}
/// <summary>
/// Attach WorkfowRuntime with services based on the config file
/// </summary>
/// <param name="configSectionName"></param>
public static WorkflowRuntime Attach(string workflowRuntimeConfig, string localServicesConfig)
{
ExternalDataExchangeService dataExchangeService = null;
WorkflowRuntime workflowRuntime = AppDomain.CurrentDomain.GetData(WorkflowRuntimeName) as WorkflowRuntime;
if (workflowRuntime == null)
{
lock (AppDomain.CurrentDomain.FriendlyName)
{
if (workflowRuntime == null)
{
if (workflowRuntimeConfig == null)
{
// default services
workflowRuntime = new WorkflowRuntime();
}
else
{
// add services from config file
workflowRuntime = new WorkflowRuntime(workflowRuntimeConfig);
}
if (workflowRuntime == null)
{
throw new NullReferenceException("The WorkflowRuntime initializing failed");
}
// exchange data between the host and workflow
dataExchangeService = workflowRuntime.GetService <ExternalDataExchangeService>();
if (dataExchangeService == null)
{
if (localServicesConfig == null)
{
dataExchangeService = new ExternalDataExchangeService();
}
else
{
dataExchangeService = new ExternalDataExchangeService(localServicesConfig);
}
// add service for exchange data
workflowRuntime.AddService(dataExchangeService);
}
// generic local service based on the Request/Response exchange pattern
InvokerLocalService invokerLocalService = (InvokerLocalService)dataExchangeService.GetService(typeof(InvokerLocalService));
if (invokerLocalService == null)
{
invokerLocalService = new InvokerLocalService(workflowRuntime);
dataExchangeService.AddService(invokerLocalService);
}
// Start all services registered in this container
workflowRuntime.StartRuntime();
AppDomain.CurrentDomain.SetData(WorkflowRuntimeName, workflowRuntime);
}
}
}
return(workflowRuntime);
}
