public async Task <TransitionEvaluationResult> Evaluate(TransitionEvaluationContext transitionEvaluationContext, CancellationToken cancellationToken)
{
var remoteCode = Code.GetRemoteCode();
var remoteExecutionState = transitionEvaluationContext.StateExecutionContext.WorkflowContext
.CreateRemoteExecutionState(transitionEvaluationContext.TransitionConfiguration.Parameters, remoteCode);
var activityRequestWorkflowMessage = new TransitionEvaluationRequestWorkflowMessage(remoteCode)
{
WorkflowMessageId = Guid.NewGuid(),
WorkflowInstanceId = transitionEvaluationContext.StateExecutionContext.WorkflowContext.WorkflowInstance.Id,
WorkflowId = transitionEvaluationContext.StateExecutionContext.WorkflowContext.WorkflowConfiguration.Id,
State = new WorkflowMessageState(remoteExecutionState)
};
var workflowConfiguration = transitionEvaluationContext.StateExecutionContext.WorkflowContext.WorkflowConfiguration;
var endpointConfiguration = workflowConfiguration.FindEndpointConfiguration(Code);
Log.Verbose("Sending transition evaluation request message [{code}::{messageId}] to {endpoint} [{workflowInstanceId}]",
Code, activityRequestWorkflowMessage.WorkflowMessageId, endpointConfiguration.Address,
transitionEvaluationContext.StateExecutionContext.WorkflowContext.WorkflowInstance.Id);
var messageTransport = transitionEvaluationContext.StateExecutionContext.WorkflowContext
.WorkflowMessageTransportFactoryProvider.CreateMessageTransportFactory(endpointConfiguration.Type)
.CreateMessageTransport(endpointConfiguration.Address);
var responseWorkflowMessage = await messageTransport.Request <ITransitionEvaluationRequestWorkflowMessage, ITransitionEvaluationResponseWorkflowMessage>(
endpointConfiguration, activityRequestWorkflowMessage, cancellationToken).ConfigureAwait(false);
Log.Verbose("Received transition evaluation response message [{messageId}] from {endpoint} [{workflowInstanceId}]",
activityRequestWorkflowMessage.WorkflowMessageId, endpointConfiguration.Address,
transitionEvaluationContext.StateExecutionContext.WorkflowContext.WorkflowInstance.Id);
// merge state changes made by remote transition handler during execution
transitionEvaluationContext.StateExecutionContext.WorkflowContext.MergeRemoteExecutionState(responseWorkflowMessage.State);
return(new TransitionEvaluationResult(responseWorkflowMessage.TransitionEvaluationStatus));
}
public async Task <TransitionEvaluationResult> Evaluate(StateExecutionContext stateExecutionContext, TransitionConfiguration transitionConfiguration, CancellationToken cancellationToken)
{
ITransition transition = null;
if (!string.IsNullOrEmpty(transitionConfiguration.Code))
{
transition = _workflowEngine.WorkflowEngineBuilder
.TransitionFactory.CreateTransition(transitionConfiguration.Code);
}
if (null == transition && !string.IsNullOrEmpty(transitionConfiguration.ConditionScript) &&
transitionConfiguration.ConditionScriptType == ScriptTypeConfiguration.CSharp)
{
transition = new CSharpScriptTransition(stateExecutionContext.StateConfiguration.Code,
transitionConfiguration.ConditionScriptType, transitionConfiguration.ConditionScript);
}
if (null == transition)
{
// there is neither code nor condition for transition
// ==> assume transition always evaluates to true
return(new TransitionEvaluationResult(TransitionEvaluationStatus.EvaluatedTrue));
}
Log.Verbose("Starting evaluation of transition [{code}] [{condition}] for [{workflowInstanceId}]",
transitionConfiguration.Code, transitionConfiguration.ConditionScriptType,
stateExecutionContext.WorkflowContext.WorkflowInstance.Id);
try
{
var transitionEvaluationContext = new TransitionEvaluationContext(stateExecutionContext, transitionConfiguration);
var transitionEvaluationResult = await transition.Evaluate(transitionEvaluationContext, cancellationToken).ConfigureAwait(false);
if (transitionEvaluationResult.Status == TransitionEvaluationStatus.EvaluationFailed)
{
throw new WorkflowException(string.Format(CultureInfo.InvariantCulture,
"Evaluation of an transition [code={0}], [condition={1}] returns [EvaluationFailed] for workflow instance [{2:D}]",
transitionConfiguration.Code, transitionConfiguration.ConditionScript,
stateExecutionContext.WorkflowContext.WorkflowInstance.Id));
}
return(transitionEvaluationResult);
}
catch (Exception ex)
{
throw new WorkflowException(string.Format(CultureInfo.InvariantCulture,
"An error has occurred during evaluation of an transition [code={0}], [condition={1}] for workflow instance [{2:D}]",
transitionConfiguration.Code, transitionConfiguration.ConditionScript,
stateExecutionContext.WorkflowContext.WorkflowInstance.Id), ex);
}
}
public async Task <TransitionEvaluationResult> Evaluate(TransitionEvaluationContext transitionEvaluationContext, CancellationToken cancellationToken)
{
var workflowContext = transitionEvaluationContext.StateExecutionContext.WorkflowContext;
if (ScriptType != ScriptTypeConfiguration.CSharp)
{
throw new WorkflowException(string.Format(CultureInfo.InvariantCulture,
"CSharpScriptTransition can execute only CSharp scripts but [{0}] has been provided for workflow [ID={1:D}]",
ScriptType, workflowContext.WorkflowInstance.Id));
}
var scriptKey = string.Format(CultureInfo.InvariantCulture, "TRANSITION::{0:D}::{1}::{2}::{3:D}",
workflowContext.WorkflowConfiguration.Id, transitionEvaluationContext.StateExecutionContext.StateConfiguration.Code, Code,
Script.GetHashCode());
Assembly[] assemblies = null;
var entity = workflowContext.WorkflowInstance.Entity;
if (null != entity)
{
assemblies = new[] { entity.GetType().Assembly };
}
var cSharpScript = WorkflowEngine.ScriptingEngine.Value.GetScript <TransitionExecutionContextGlobals>(scriptKey, Script, assemblies);
var scriptState = await cSharpScript.RunAsync(new TransitionExecutionContextGlobals
{
context = transitionEvaluationContext,
entity = entity,
state = transitionEvaluationContext.StateExecutionContext.WorkflowContext.WorkflowExecutionState,
workflowRuntime = workflowContext.WorkflowEngine,
cancellationToken = cancellationToken
}, cancellationToken).ConfigureAwait(false);
if (null == scriptState.Exception)
{
return((bool)scriptState.ReturnValue
? new TransitionEvaluationResult(TransitionEvaluationStatus.EvaluatedTrue)
: new TransitionEvaluationResult(TransitionEvaluationStatus.EvaluatedFalse));
}
Log.Error(scriptState.Exception, "An error has occurred during evaluation of transition [{state}, {code}] for {workflowInstanceId}]",
transitionEvaluationContext.StateExecutionContext.StateConfiguration.Code,
transitionEvaluationContext.TransitionConfiguration.Code,
transitionEvaluationContext.StateExecutionContext.WorkflowContext.WorkflowInstance.Id);
return(new TransitionEvaluationResult(TransitionEvaluationStatus.EvaluationFailed));
}
