public async Task StartAsync(CancellationToken cancellationToken)
{
var workflow = await GetWorkflowBlueprintAsync(GetWorkflowDefinition());
var workflowInstance = await _workflowRunner.StartWorkflowAsync(workflow, cancellationToken : cancellationToken);
Assert.NotNull(workflowInstance);
Assert.Null(workflowInstance.Fault);
}
public async Task <Unit> Handle(ExecuteWorkflowDefinitionRequest request, CancellationToken cancellationToken)
{
var workflowDefinitionId = request.WorkflowDefinitionId;
var tenantId = request.TenantId;
var workflowBlueprint = await _workflowRegistry.GetAsync(workflowDefinitionId, tenantId, VersionOptions.Published, cancellationToken);
if (!ValidatePreconditions(workflowDefinitionId, workflowBlueprint))
{
return(Unit.Value);
}
var lockKey = $"execute-workflow-definition:tenant:{tenantId}:workflow-definition:{workflowDefinitionId}";
var correlationId = request.CorrelationId;
var correlationLockHandle = default(IDistributedSynchronizationHandle?);
if (!string.IsNullOrWhiteSpace(correlationId))
{
_logger.LogDebug("Acquiring lock on correlation ID {CorrelationId}", correlationId);
correlationLockHandle = await _distributedLockProvider.AcquireLockAsync(correlationId, _elsaOptions.DistributedLockTimeout, cancellationToken);
if (correlationLockHandle == null)
{
throw new LockAcquisitionException($"Failed to acquire a lock on correlation ID {correlationId}");
}
}
try
{
await using var handle = await _distributedLockProvider.AcquireLockAsync(lockKey, _elsaOptions.DistributedLockTimeout, cancellationToken);
if (handle == null)
{
throw new LockAcquisitionException($"Failed to acquire a lock on {lockKey}");
}
if (!workflowBlueprint !.IsSingleton || await GetWorkflowIsAlreadyExecutingAsync(tenantId, workflowDefinitionId) == false)
{
await _startsWorkflow.StartWorkflowAsync(workflowBlueprint, request.ActivityId, request.Input, request.CorrelationId, request.ContextId, cancellationToken);
}
}
finally
{
if (correlationLockHandle != null)
{
await correlationLockHandle.DisposeAsync();
}
}
return(Unit.Value);
}