mirror of https://github.com/dapr/docs.git
scaffold out docs for workflow java sdk
Signed-off-by: Hannah Hunter <hannahhunter@microsoft.com>
This commit is contained in:
Hannah Hunter
parent
4d444bd12a
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@ -30,7 +30,25 @@ The Dapr sidecar doesn’t load any workflow definitions. Rather, the sidecar si
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[Workflow activities]({{< ref "workflow-features-concepts.md#workflow-activites" >}}) are the basic unit of work in a workflow and are the tasks that get orchestrated in the business process.
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{{< tabs ".NET" Python >}}
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{{< tabs Python ".NET" Java >}}
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{{% codetab %}}
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<!--python-->
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Define the workflow activities you'd like your workflow to perform. Activities are a function definition and can take inputs and outputs. The following example creates a counter (activity) called `hello_act` that notifies users of the current counter value. `hello_act` is a function derived from a class called `WorkflowActivityContext`.
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```python
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def hello_act(ctx: WorkflowActivityContext, input):
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global counter
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counter += input
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print(f'New counter value is: {counter}!', flush=True)
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```
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[See the `hello_act` workflow activity in context.](https://github.com/dapr/python-sdk/blob/master/examples/demo_workflow/app.py#LL40C1-L43C59)
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{{% /codetab %}}
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{{% codetab %}}
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@ -102,29 +120,67 @@ public class ProcessPaymentActivity : WorkflowActivity<PaymentRequest, object>
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{{% codetab %}}
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<!--python-->
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<!--java-->
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Define the workflow activities you'd like your workflow to perform. Activities are a function definition and can take inputs and outputs. The following example creates a counter (activity) called `hello_act` that notifies users of the current counter value. `hello_act` is a function derived from a class called `WorkflowActivityContext`.
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Define the workflow activities you'd like your workflow to perform.
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```python
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def hello_act(ctx: WorkflowActivityContext, input):
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global counter
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counter += input
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print(f'New counter value is: {counter}!', flush=True)
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The activities called in the example below are:
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- `need`: Receive notification of a new order.
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### [activity]
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```java
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todo
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```
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[See the `hello_act` workflow activity in context.](https://github.com/dapr/python-sdk/blob/master/examples/demo_workflow/app.py#LL40C1-L43C59)
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[See the full `todo` workflow activity example.](todo)
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### [activity]
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```java
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todo
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```
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[See the full `todo` workflow activity example.](todo)
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### [todo]
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```java
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todo
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```
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[See the full `todo` workflow activity example.](todo)
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{{% /codetab %}}
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{{< /tabs >}}
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## Write the workflow
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Next, register and call the activites in a workflow.
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{{< tabs ".NET" Python >}}
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{{< tabs Python ".NET" Java >}}
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{{% codetab %}}
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<!--python-->
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The `hello_world_wf` function is derived from a class called `DaprWorkflowContext` with input and output parameter types. It also includes a `yield` statement that does the heavy lifting of the workflow and calls the workflow activities.
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```python
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def hello_world_wf(ctx: DaprWorkflowContext, input):
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print(f'{input}')
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yield ctx.call_activity(hello_act, input=1)
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yield ctx.call_activity(hello_act, input=10)
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yield ctx.wait_for_external_event("event1")
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yield ctx.call_activity(hello_act, input=100)
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yield ctx.call_activity(hello_act, input=1000)
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```
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[See the `hello_world_wf` workflow in context.](https://github.com/dapr/python-sdk/blob/master/examples/demo_workflow/app.py#LL32C1-L38C51)
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{{% /codetab %}}
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{{% codetab %}}
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@ -171,21 +227,15 @@ The `OrderProcessingWorkflow` class is derived from a base class called `Workflo
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{{% codetab %}}
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<!--python-->
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<!--java-->
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The `hello_world_wf` function is derived from a class called `DaprWorkflowContext` with input and output parameter types. It also includes a `yield` statement that does the heavy lifting of the workflow and calls the workflow activities.
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Intro
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```python
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def hello_world_wf(ctx: DaprWorkflowContext, input):
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print(f'{input}')
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yield ctx.call_activity(hello_act, input=1)
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yield ctx.call_activity(hello_act, input=10)
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yield ctx.wait_for_external_event("event1")
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yield ctx.call_activity(hello_act, input=100)
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yield ctx.call_activity(hello_act, input=1000)
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```java
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todo
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```
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[See the `hello_world_wf` workflow in context.](https://github.com/dapr/python-sdk/blob/master/examples/demo_workflow/app.py#LL32C1-L38C51)
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[See the `todo` workflow in context.](todo)
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{{% /codetab %}}
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@ -196,78 +246,7 @@ def hello_world_wf(ctx: DaprWorkflowContext, input):
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Finally, compose the application using the workflow.
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{{< tabs ".NET" Python >}}
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{{% codetab %}}
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<!--csharp-->
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[In the following `Program.cs` example](https://github.com/dapr/dotnet-sdk/blob/master/examples/Workflow/WorkflowConsoleApp/Program.cs), for a basic ASP.NET order processing application using the .NET SDK, your project code would include:
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- A NuGet package called `Dapr.Workflow` to receive the .NET SDK capabilities
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- A builder with an extension method called `AddDaprWorkflow`
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- This will allow you to register workflows and workflow activities (tasks that workflows can schedule)
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- HTTP API calls
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- One for submitting a new order
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- One for checking the status of an existing order
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```csharp
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using Dapr.Workflow;
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//...
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// Dapr Workflows are registered as part of the service configuration
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builder.Services.AddDaprWorkflow(options =>
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{
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// Note that it's also possible to register a lambda function as the workflow
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// or activity implementation instead of a class.
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options.RegisterWorkflow<OrderProcessingWorkflow>();
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// These are the activities that get invoked by the workflow(s).
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options.RegisterActivity<NotifyActivity>();
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options.RegisterActivity<ReserveInventoryActivity>();
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options.RegisterActivity<ProcessPaymentActivity>();
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});
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WebApplication app = builder.Build();
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// POST starts new order workflow instance
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app.MapPost("/orders", async (WorkflowEngineClient client, [FromBody] OrderPayload orderInfo) =>
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{
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if (orderInfo?.Name == null)
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{
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return Results.BadRequest(new
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{
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message = "Order data was missing from the request",
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example = new OrderPayload("Paperclips", 99.95),
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});
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}
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//...
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});
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// GET fetches state for order workflow to report status
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app.MapGet("/orders/{orderId}", async (string orderId, WorkflowEngineClient client) =>
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{
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WorkflowState state = await client.GetWorkflowStateAsync(orderId, true);
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if (!state.Exists)
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{
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return Results.NotFound($"No order with ID = '{orderId}' was found.");
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}
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var httpResponsePayload = new
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{
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details = state.ReadInputAs<OrderPayload>(),
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status = state.RuntimeStatus.ToString(),
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result = state.ReadOutputAs<OrderResult>(),
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};
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//...
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}).WithName("GetOrderInfoEndpoint");
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app.Run();
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```
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{{% /codetab %}}
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{{< tabs Python ".NET" Java >}}
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{{% codetab %}}
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@ -356,6 +335,91 @@ if __name__ == '__main__':
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```
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{{% /codetab %}}
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{{% codetab %}}
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<!--csharp-->
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[In the following `Program.cs` example](https://github.com/dapr/dotnet-sdk/blob/master/examples/Workflow/WorkflowConsoleApp/Program.cs), for a basic ASP.NET order processing application using the .NET SDK, your project code would include:
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- A NuGet package called `Dapr.Workflow` to receive the .NET SDK capabilities
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- A builder with an extension method called `AddDaprWorkflow`
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- This will allow you to register workflows and workflow activities (tasks that workflows can schedule)
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- HTTP API calls
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- One for submitting a new order
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- One for checking the status of an existing order
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```csharp
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using Dapr.Workflow;
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//...
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// Dapr Workflows are registered as part of the service configuration
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builder.Services.AddDaprWorkflow(options =>
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{
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// Note that it's also possible to register a lambda function as the workflow
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// or activity implementation instead of a class.
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options.RegisterWorkflow<OrderProcessingWorkflow>();
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// These are the activities that get invoked by the workflow(s).
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options.RegisterActivity<NotifyActivity>();
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options.RegisterActivity<ReserveInventoryActivity>();
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options.RegisterActivity<ProcessPaymentActivity>();
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});
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WebApplication app = builder.Build();
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// POST starts new order workflow instance
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app.MapPost("/orders", async (WorkflowEngineClient client, [FromBody] OrderPayload orderInfo) =>
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{
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if (orderInfo?.Name == null)
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{
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return Results.BadRequest(new
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{
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message = "Order data was missing from the request",
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example = new OrderPayload("Paperclips", 99.95),
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});
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}
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//...
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});
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// GET fetches state for order workflow to report status
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app.MapGet("/orders/{orderId}", async (string orderId, WorkflowEngineClient client) =>
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{
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WorkflowState state = await client.GetWorkflowStateAsync(orderId, true);
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if (!state.Exists)
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{
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return Results.NotFound($"No order with ID = '{orderId}' was found.");
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}
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var httpResponsePayload = new
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{
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details = state.ReadInputAs<OrderPayload>(),
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status = state.RuntimeStatus.ToString(),
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result = state.ReadOutputAs<OrderResult>(),
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};
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//...
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}).WithName("GetOrderInfoEndpoint");
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app.Run();
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```
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{{% /codetab %}}
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{{% codetab %}}
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<!--java-->
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[In the following example](todo), for a basic Java hello world application using the Java SDK, your project code would include:
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- A Java package called `todo` to receive the Java SDK capabilities.
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```java
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todo
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```
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{{% /codetab %}}
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@ -377,5 +441,6 @@ Now that you've authored a workflow, learn how to manage it.
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- [Workflow overview]({{< ref workflow-overview.md >}})
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- [Workflow API reference]({{< ref workflow_api.md >}})
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- Try out the full SDK examples:
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- [.NET example](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow)
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- [Python example](https://github.com/dapr/python-sdk/tree/master/examples/demo_workflow)
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- [.NET example](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow)
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- [Java example](todo)
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@ -8,43 +8,7 @@ description: Manage and run workflows
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Now that you've [authored the workflow and its activities in your application]({{< ref howto-author-workflow.md >}}), you can start, terminate, and get information about the workflow using HTTP API calls. For more information, read the [workflow API reference]({{< ref workflow_api.md >}}).
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{{< tabs ".NET" Python HTTP >}}
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<!--NET-->
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{{% codetab %}}
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Manage your workflow within your code. In the `OrderProcessingWorkflow` example from the [Author a workflow]({{< ref "howto-author-workflow.md#write-the-application" >}}) guide, the workflow is registered in the code. You can now start, terminate, and get information about a running workflow:
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```csharp
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string orderId = "exampleOrderId";
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string workflowComponent = "dapr";
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string workflowName = "OrderProcessingWorkflow";
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OrderPayload input = new OrderPayload("Paperclips", 99.95);
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Dictionary<string, string> workflowOptions; // This is an optional parameter
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// Start the workflow. This returns back a "StartWorkflowResponse" which contains the instance ID for the particular workflow instance.
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StartWorkflowResponse startResponse = await daprClient.StartWorkflowAsync(orderId, workflowComponent, workflowName, input, workflowOptions);
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// Get information on the workflow. This response contains information such as the status of the workflow, when it started, and more!
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GetWorkflowResponse getResponse = await daprClient.GetWorkflowAsync(orderId, workflowComponent, workflowName);
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// Terminate the workflow
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await daprClient.TerminateWorkflowAsync(orderId, workflowComponent);
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// Raise an event (an incoming purchase order) that your workflow will wait for. This returns the item waiting to be purchased.
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await daprClient.RaiseWorkflowEventAsync(orderId, workflowComponent, workflowName, input);
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// Pause
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await daprClient.PauseWorkflowAsync(orderId, workflowComponent);
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// Resume
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await daprClient.ResumeWorkflowAsync(orderId, workflowComponent);
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// Purge
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await daprClient.PurgeWorkflowAsync(orderId, workflowComponent);
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```
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{{% /codetab %}}
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{{< tabs Python ".NET" Java HTTP >}}
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<!--Python-->
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{{% codetab %}}
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@ -95,6 +59,53 @@ d.terminate_workflow(instance_id=instanceId, workflow_component=workflowComponen
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{{% /codetab %}}
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<!--NET-->
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{{% codetab %}}
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Manage your workflow within your code. In the `OrderProcessingWorkflow` example from the [Author a workflow]({{< ref "howto-author-workflow.md#write-the-application" >}}) guide, the workflow is registered in the code. You can now start, terminate, and get information about a running workflow:
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```csharp
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string orderId = "exampleOrderId";
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string workflowComponent = "dapr";
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string workflowName = "OrderProcessingWorkflow";
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OrderPayload input = new OrderPayload("Paperclips", 99.95);
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Dictionary<string, string> workflowOptions; // This is an optional parameter
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// Start the workflow. This returns back a "StartWorkflowResponse" which contains the instance ID for the particular workflow instance.
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StartWorkflowResponse startResponse = await daprClient.StartWorkflowAsync(orderId, workflowComponent, workflowName, input, workflowOptions);
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// Get information on the workflow. This response contains information such as the status of the workflow, when it started, and more!
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GetWorkflowResponse getResponse = await daprClient.GetWorkflowAsync(orderId, workflowComponent, workflowName);
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// Terminate the workflow
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await daprClient.TerminateWorkflowAsync(orderId, workflowComponent);
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// Raise an event (an incoming purchase order) that your workflow will wait for. This returns the item waiting to be purchased.
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await daprClient.RaiseWorkflowEventAsync(orderId, workflowComponent, workflowName, input);
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// Pause
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await daprClient.PauseWorkflowAsync(orderId, workflowComponent);
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// Resume
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await daprClient.ResumeWorkflowAsync(orderId, workflowComponent);
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// Purge
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await daprClient.PurgeWorkflowAsync(orderId, workflowComponent);
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```
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{{% /codetab %}}
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<!--Python-->
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{{% codetab %}}
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Manage your workflow within your code. In the workflow example from the [Author a workflow]({{< ref "howto-author-workflow.md#write-the-application" >}}) guide, the workflow is registered in the code using the following APIs:
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```java
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todo
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```
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{{% /codetab %}}
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<!--HTTP-->
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{{% codetab %}}
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@ -172,6 +183,8 @@ Learn more about these HTTP calls in the [workflow API reference guide]({{< ref
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## Next steps
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- [Try out the Workflow quickstart]({{< ref workflow-quickstart.md >}})
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- Try out the full SDK examples:
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- [.NET example](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow)
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- [Python example](https://github.com/dapr/python-sdk/blob/master/examples/demo_workflow/app.py)
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- [.NET example](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow)
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- [Java example](todo)
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- [Workflow API reference]({{< ref workflow_api.md >}})
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|
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@ -83,9 +83,9 @@ You can use the following SDKs to author a workflow.
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| Language stack | Package |
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| - | - |
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| .NET | [Dapr.Workflow](https://www.nuget.org/profiles/dapr.io) |
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| Python | [dapr-ext-workflow](https://github.com/dapr/python-sdk/tree/master/ext/dapr-ext-workflow) |
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| .NET | [Dapr.Workflow](https://www.nuget.org/profiles/dapr.io) |
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| Java | need |
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## Try out workflows
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@ -96,8 +96,9 @@ Want to put workflows to the test? Walk through the following quickstart and tut
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| Quickstart/tutorial | Description |
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| ------------------- | ----------- |
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| [Workflow quickstart]({{< ref workflow-quickstart.md >}}) | Run a .NET workflow application with four workflow activities to see Dapr Workflow in action |
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| [Workflow .NET SDK example](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow) | Learn how to create a Dapr Workflow and invoke it using ASP.NET Core web APIs. |
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| [Workflow Python SDK example](https://github.com/dapr/python-sdk/tree/master/examples/demo_workflow) | Learn how to create a Dapr Workflow and invoke it using the Python `DaprClient` package. |
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| [Workflow .NET SDK example](https://github.com/dapr/dotnet-sdk/tree/master/examples/Workflow) | Learn how to create a Dapr Workflow and invoke it using ASP.NET Core web APIs. |
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| [Workflow Java SDK example](todo) | Learn how to create a Dapr Workflow and invoke it using the Java `need` package. |
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### Start using workflows directly in your app
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|
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|
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@ -21,240 +21,7 @@ In this guide, you'll:
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<img src="/images/workflow-quickstart-overview.png" width=800 style="padding-bottom:15px;">
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{{< tabs ".NET" "Python" >}}
|
||||
|
||||
<!-- .NET -->
|
||||
{{% codetab %}}
|
||||
|
||||
The `order-processor` console app starts and manages the lifecycle of an order processing workflow that stores and retrieves data in a state store. The workflow consists of four workflow activities, or tasks:
|
||||
- `NotifyActivity`: Utilizes a logger to print out messages throughout the workflow
|
||||
- `ReserveInventoryActivity`: Checks the state store to ensure that there is enough inventory for the purchase
|
||||
- `ProcessPaymentActivity`: Processes and authorizes the payment
|
||||
- `UpdateInventoryActivity`: Removes the requested items from the state store and updates the store with the new remaining inventory value
|
||||
|
||||
|
||||
### Step 1: Pre-requisites
|
||||
|
||||
For this example, you will need:
|
||||
|
||||
- [Dapr CLI and initialized environment](https://docs.dapr.io/getting-started).
|
||||
- [.NET SDK or .NET 6 SDK installed](https://dotnet.microsoft.com/download).
|
||||
<!-- IGNORE_LINKS -->
|
||||
- [Docker Desktop](https://www.docker.com/products/docker-desktop)
|
||||
<!-- END_IGNORE -->
|
||||
|
||||
### Step 2: Set up the environment
|
||||
|
||||
Clone the [sample provided in the Quickstarts repo](https://github.com/dapr/quickstarts/tree/master/workflows).
|
||||
|
||||
```bash
|
||||
git clone https://github.com/dapr/quickstarts.git
|
||||
```
|
||||
|
||||
In a new terminal window, navigate to the `order-processor` directory:
|
||||
|
||||
```bash
|
||||
cd workflows/csharp/sdk/order-processor
|
||||
```
|
||||
|
||||
### Step 3: Run the order processor app
|
||||
|
||||
In the terminal, start the order processor app alongside a Dapr sidecar:
|
||||
|
||||
```bash
|
||||
dapr run --app-id order-processor dotnet run
|
||||
```
|
||||
|
||||
This starts the `order-processor` app with unique workflow ID and runs the workflow activities.
|
||||
|
||||
Expected output:
|
||||
|
||||
```
|
||||
== APP == Starting workflow 6d2abcc9 purchasing 10 Cars
|
||||
|
||||
== APP == info: Microsoft.DurableTask.Client.Grpc.GrpcDurableTaskClient[40]
|
||||
== APP == Scheduling new OrderProcessingWorkflow orchestration with instance ID '6d2abcc9' and 47 bytes of input data.
|
||||
== APP == info: WorkflowConsoleApp.Activities.NotifyActivity[0]
|
||||
== APP == Received order 6d2abcc9 for 10 Cars at $15000
|
||||
== APP == info: WorkflowConsoleApp.Activities.ReserveInventoryActivity[0]
|
||||
== APP == Reserving inventory for order 6d2abcc9 of 10 Cars
|
||||
== APP == info: WorkflowConsoleApp.Activities.ReserveInventoryActivity[0]
|
||||
== APP == There are: 100, Cars available for purchase
|
||||
|
||||
== APP == Your workflow has started. Here is the status of the workflow: Dapr.Workflow.WorkflowState
|
||||
|
||||
== APP == info: WorkflowConsoleApp.Activities.ProcessPaymentActivity[0]
|
||||
== APP == Processing payment: 6d2abcc9 for 10 Cars at $15000
|
||||
== APP == info: WorkflowConsoleApp.Activities.ProcessPaymentActivity[0]
|
||||
== APP == Payment for request ID '6d2abcc9' processed successfully
|
||||
== APP == info: WorkflowConsoleApp.Activities.UpdateInventoryActivity[0]
|
||||
== APP == Checking Inventory for: Order# 6d2abcc9 for 10 Cars
|
||||
== APP == info: WorkflowConsoleApp.Activities.UpdateInventoryActivity[0]
|
||||
== APP == There are now: 90 Cars left in stock
|
||||
== APP == info: WorkflowConsoleApp.Activities.NotifyActivity[0]
|
||||
== APP == Order 6d2abcc9 has completed!
|
||||
|
||||
== APP == Workflow Status: Completed
|
||||
```
|
||||
|
||||
### (Optional) Step 4: View in Zipkin
|
||||
|
||||
If you have Zipkin configured for Dapr locally on your machine, you can view the workflow trace spans in the Zipkin web UI (typically at `http://localhost:9411/zipkin/`).
|
||||
|
||||
<img src="/images/workflow-trace-spans-zipkin.png" width=800 style="padding-bottom:15px;">
|
||||
|
||||
### What happened?
|
||||
|
||||
When you ran `dapr run --app-id order-processor dotnet run`:
|
||||
|
||||
1. A unique order ID for the workflow is generated (in the above example, `6d2abcc9`) and the workflow is scheduled.
|
||||
1. The `NotifyActivity` workflow activity sends a notification saying an order for 10 cars has been received.
|
||||
1. The `ReserveInventoryActivity` workflow activity checks the inventory data, determines if you can supply the ordered item, and responds with the number of cars in stock.
|
||||
1. Your workflow starts and notifies you of its status.
|
||||
1. The `ProcessPaymentActivity` workflow activity begins processing payment for order `6d2abcc9` and confirms if successful.
|
||||
1. The `UpdateInventoryActivity` workflow activity updates the inventory with the current available cars after the order has been processed.
|
||||
1. The `NotifyActivity` workflow activity sends a notification saying that order `6d2abcc9` has completed.
|
||||
1. The workflow terminates as completed.
|
||||
|
||||
#### `order-processor/Program.cs`
|
||||
|
||||
In the application's program file:
|
||||
- The unique workflow order ID is generated
|
||||
- The workflow is scheduled
|
||||
- The workflow status is retrieved
|
||||
- The workflow and the workflow activities it invokes are registered
|
||||
|
||||
```csharp
|
||||
using Dapr.Client;
|
||||
using Dapr.Workflow;
|
||||
//...
|
||||
|
||||
{
|
||||
services.AddDaprWorkflow(options =>
|
||||
{
|
||||
// Note that it's also possible to register a lambda function as the workflow
|
||||
// or activity implementation instead of a class.
|
||||
options.RegisterWorkflow<OrderProcessingWorkflow>();
|
||||
|
||||
// These are the activities that get invoked by the workflow(s).
|
||||
options.RegisterActivity<NotifyActivity>();
|
||||
options.RegisterActivity<ReserveInventoryActivity>();
|
||||
options.RegisterActivity<ProcessPaymentActivity>();
|
||||
options.RegisterActivity<UpdateInventoryActivity>();
|
||||
});
|
||||
};
|
||||
|
||||
//...
|
||||
|
||||
// Generate a unique ID for the workflow
|
||||
string orderId = Guid.NewGuid().ToString()[..8];
|
||||
string itemToPurchase = "Cars";
|
||||
int ammountToPurchase = 10;
|
||||
|
||||
// Construct the order
|
||||
OrderPayload orderInfo = new OrderPayload(itemToPurchase, 15000, ammountToPurchase);
|
||||
|
||||
// Start the workflow
|
||||
Console.WriteLine("Starting workflow {0} purchasing {1} {2}", orderId, ammountToPurchase, itemToPurchase);
|
||||
|
||||
await daprClient.StartWorkflowAsync(
|
||||
workflowComponent: DaprWorkflowComponent,
|
||||
workflowName: nameof(OrderProcessingWorkflow),
|
||||
input: orderInfo,
|
||||
instanceId: orderId);
|
||||
|
||||
// Wait for the workflow to start and confirm the input
|
||||
GetWorkflowResponse state = await daprClient.WaitForWorkflowStartAsync(
|
||||
instanceId: orderId,
|
||||
workflowComponent: DaprWorkflowComponent);
|
||||
|
||||
Console.WriteLine("Your workflow has started. Here is the status of the workflow: {0}", state.RuntimeStatus);
|
||||
|
||||
// Wait for the workflow to complete
|
||||
state = await daprClient.WaitForWorkflowCompletionAsync(
|
||||
instanceId: orderId,
|
||||
workflowComponent: DaprWorkflowComponent);
|
||||
|
||||
Console.WriteLine("Workflow Status: {0}", state.RuntimeStatus);
|
||||
```
|
||||
|
||||
#### `order-processor/Workflows/OrderProcessingWorkflow.cs`
|
||||
|
||||
In `OrderProcessingWorkflow.cs`, the workflow is defined as a class with all of its associated tasks (determined by workflow activities).
|
||||
|
||||
```csharp
|
||||
using Dapr.Workflow;
|
||||
//...
|
||||
|
||||
class OrderProcessingWorkflow : Workflow<OrderPayload, OrderResult>
|
||||
{
|
||||
public override async Task<OrderResult> RunAsync(WorkflowContext context, OrderPayload order)
|
||||
{
|
||||
string orderId = context.InstanceId;
|
||||
|
||||
// Notify the user that an order has come through
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Received order {orderId} for {order.Quantity} {order.Name} at ${order.TotalCost}"));
|
||||
|
||||
string requestId = context.InstanceId;
|
||||
|
||||
// Determine if there is enough of the item available for purchase by checking the inventory
|
||||
InventoryResult result = await context.CallActivityAsync<InventoryResult>(
|
||||
nameof(ReserveInventoryActivity),
|
||||
new InventoryRequest(RequestId: orderId, order.Name, order.Quantity));
|
||||
|
||||
// If there is insufficient inventory, fail and let the user know
|
||||
if (!result.Success)
|
||||
{
|
||||
// End the workflow here since we don't have sufficient inventory
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Insufficient inventory for {order.Name}"));
|
||||
return new OrderResult(Processed: false);
|
||||
}
|
||||
|
||||
// There is enough inventory available so the user can purchase the item(s). Process their payment
|
||||
await context.CallActivityAsync(
|
||||
nameof(ProcessPaymentActivity),
|
||||
new PaymentRequest(RequestId: orderId, order.Name, order.Quantity, order.TotalCost));
|
||||
|
||||
try
|
||||
{
|
||||
// There is enough inventory available so the user can purchase the item(s). Process their payment
|
||||
await context.CallActivityAsync(
|
||||
nameof(UpdateInventoryActivity),
|
||||
new PaymentRequest(RequestId: orderId, order.Name, order.Quantity, order.TotalCost));
|
||||
}
|
||||
catch (TaskFailedException)
|
||||
{
|
||||
// Let them know their payment was processed
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Order {orderId} Failed! You are now getting a refund"));
|
||||
return new OrderResult(Processed: false);
|
||||
}
|
||||
|
||||
// Let them know their payment was processed
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Order {orderId} has completed!"));
|
||||
|
||||
// End the workflow with a success result
|
||||
return new OrderResult(Processed: true);
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
#### `order-processor/Activities` directory
|
||||
|
||||
The `Activities` directory holds the four workflow activities used by the workflow, defined in the following files:
|
||||
- `NotifyActivity.cs`
|
||||
- `ReserveInventoryActivity.cs`
|
||||
- `ProcessPaymentActivity.cs`
|
||||
- `UpdateInventoryActivity.cs`
|
||||
|
||||
{{% /codetab %}}
|
||||
{{< tabs "Python" ".NET" "Java" >}}
|
||||
|
||||
<!-- Python -->
|
||||
{{% codetab %}}
|
||||
|
|
@ -494,6 +261,334 @@ In `workflow.py`, the workflow is defined as a class with all of its associated
|
|||
```
|
||||
{{% /codetab %}}
|
||||
|
||||
<!-- .NET -->
|
||||
{{% codetab %}}
|
||||
|
||||
The `order-processor` console app starts and manages the lifecycle of an order processing workflow that stores and retrieves data in a state store. The workflow consists of four workflow activities, or tasks:
|
||||
- `NotifyActivity`: Utilizes a logger to print out messages throughout the workflow
|
||||
- `ReserveInventoryActivity`: Checks the state store to ensure that there is enough inventory for the purchase
|
||||
- `ProcessPaymentActivity`: Processes and authorizes the payment
|
||||
- `UpdateInventoryActivity`: Removes the requested items from the state store and updates the store with the new remaining inventory value
|
||||
|
||||
|
||||
### Step 1: Pre-requisites
|
||||
|
||||
For this example, you will need:
|
||||
|
||||
- [Dapr CLI and initialized environment](https://docs.dapr.io/getting-started).
|
||||
- [.NET SDK or .NET 6 SDK installed](https://dotnet.microsoft.com/download).
|
||||
<!-- IGNORE_LINKS -->
|
||||
- [Docker Desktop](https://www.docker.com/products/docker-desktop)
|
||||
<!-- END_IGNORE -->
|
||||
|
||||
### Step 2: Set up the environment
|
||||
|
||||
Clone the [sample provided in the Quickstarts repo](https://github.com/dapr/quickstarts/tree/master/workflows).
|
||||
|
||||
```bash
|
||||
git clone https://github.com/dapr/quickstarts.git
|
||||
```
|
||||
|
||||
In a new terminal window, navigate to the `order-processor` directory:
|
||||
|
||||
```bash
|
||||
cd workflows/csharp/sdk/order-processor
|
||||
```
|
||||
|
||||
### Step 3: Run the order processor app
|
||||
|
||||
In the terminal, start the order processor app alongside a Dapr sidecar:
|
||||
|
||||
```bash
|
||||
dapr run --app-id order-processor dotnet run
|
||||
```
|
||||
|
||||
This starts the `order-processor` app with unique workflow ID and runs the workflow activities.
|
||||
|
||||
Expected output:
|
||||
|
||||
```
|
||||
== APP == Starting workflow 6d2abcc9 purchasing 10 Cars
|
||||
|
||||
== APP == info: Microsoft.DurableTask.Client.Grpc.GrpcDurableTaskClient[40]
|
||||
== APP == Scheduling new OrderProcessingWorkflow orchestration with instance ID '6d2abcc9' and 47 bytes of input data.
|
||||
== APP == info: WorkflowConsoleApp.Activities.NotifyActivity[0]
|
||||
== APP == Received order 6d2abcc9 for 10 Cars at $15000
|
||||
== APP == info: WorkflowConsoleApp.Activities.ReserveInventoryActivity[0]
|
||||
== APP == Reserving inventory for order 6d2abcc9 of 10 Cars
|
||||
== APP == info: WorkflowConsoleApp.Activities.ReserveInventoryActivity[0]
|
||||
== APP == There are: 100, Cars available for purchase
|
||||
|
||||
== APP == Your workflow has started. Here is the status of the workflow: Dapr.Workflow.WorkflowState
|
||||
|
||||
== APP == info: WorkflowConsoleApp.Activities.ProcessPaymentActivity[0]
|
||||
== APP == Processing payment: 6d2abcc9 for 10 Cars at $15000
|
||||
== APP == info: WorkflowConsoleApp.Activities.ProcessPaymentActivity[0]
|
||||
== APP == Payment for request ID '6d2abcc9' processed successfully
|
||||
== APP == info: WorkflowConsoleApp.Activities.UpdateInventoryActivity[0]
|
||||
== APP == Checking Inventory for: Order# 6d2abcc9 for 10 Cars
|
||||
== APP == info: WorkflowConsoleApp.Activities.UpdateInventoryActivity[0]
|
||||
== APP == There are now: 90 Cars left in stock
|
||||
== APP == info: WorkflowConsoleApp.Activities.NotifyActivity[0]
|
||||
== APP == Order 6d2abcc9 has completed!
|
||||
|
||||
== APP == Workflow Status: Completed
|
||||
```
|
||||
|
||||
### (Optional) Step 4: View in Zipkin
|
||||
|
||||
If you have Zipkin configured for Dapr locally on your machine, you can view the workflow trace spans in the Zipkin web UI (typically at `http://localhost:9411/zipkin/`).
|
||||
|
||||
<img src="/images/workflow-trace-spans-zipkin.png" width=800 style="padding-bottom:15px;">
|
||||
|
||||
### What happened?
|
||||
|
||||
When you ran `dapr run --app-id order-processor dotnet run`:
|
||||
|
||||
1. A unique order ID for the workflow is generated (in the above example, `6d2abcc9`) and the workflow is scheduled.
|
||||
1. The `NotifyActivity` workflow activity sends a notification saying an order for 10 cars has been received.
|
||||
1. The `ReserveInventoryActivity` workflow activity checks the inventory data, determines if you can supply the ordered item, and responds with the number of cars in stock.
|
||||
1. Your workflow starts and notifies you of its status.
|
||||
1. The `ProcessPaymentActivity` workflow activity begins processing payment for order `6d2abcc9` and confirms if successful.
|
||||
1. The `UpdateInventoryActivity` workflow activity updates the inventory with the current available cars after the order has been processed.
|
||||
1. The `NotifyActivity` workflow activity sends a notification saying that order `6d2abcc9` has completed.
|
||||
1. The workflow terminates as completed.
|
||||
|
||||
#### `order-processor/Program.cs`
|
||||
|
||||
In the application's program file:
|
||||
- The unique workflow order ID is generated
|
||||
- The workflow is scheduled
|
||||
- The workflow status is retrieved
|
||||
- The workflow and the workflow activities it invokes are registered
|
||||
|
||||
```csharp
|
||||
using Dapr.Client;
|
||||
using Dapr.Workflow;
|
||||
//...
|
||||
|
||||
{
|
||||
services.AddDaprWorkflow(options =>
|
||||
{
|
||||
// Note that it's also possible to register a lambda function as the workflow
|
||||
// or activity implementation instead of a class.
|
||||
options.RegisterWorkflow<OrderProcessingWorkflow>();
|
||||
|
||||
// These are the activities that get invoked by the workflow(s).
|
||||
options.RegisterActivity<NotifyActivity>();
|
||||
options.RegisterActivity<ReserveInventoryActivity>();
|
||||
options.RegisterActivity<ProcessPaymentActivity>();
|
||||
options.RegisterActivity<UpdateInventoryActivity>();
|
||||
});
|
||||
};
|
||||
|
||||
//...
|
||||
|
||||
// Generate a unique ID for the workflow
|
||||
string orderId = Guid.NewGuid().ToString()[..8];
|
||||
string itemToPurchase = "Cars";
|
||||
int ammountToPurchase = 10;
|
||||
|
||||
// Construct the order
|
||||
OrderPayload orderInfo = new OrderPayload(itemToPurchase, 15000, ammountToPurchase);
|
||||
|
||||
// Start the workflow
|
||||
Console.WriteLine("Starting workflow {0} purchasing {1} {2}", orderId, ammountToPurchase, itemToPurchase);
|
||||
|
||||
await daprClient.StartWorkflowAsync(
|
||||
workflowComponent: DaprWorkflowComponent,
|
||||
workflowName: nameof(OrderProcessingWorkflow),
|
||||
input: orderInfo,
|
||||
instanceId: orderId);
|
||||
|
||||
// Wait for the workflow to start and confirm the input
|
||||
GetWorkflowResponse state = await daprClient.WaitForWorkflowStartAsync(
|
||||
instanceId: orderId,
|
||||
workflowComponent: DaprWorkflowComponent);
|
||||
|
||||
Console.WriteLine("Your workflow has started. Here is the status of the workflow: {0}", state.RuntimeStatus);
|
||||
|
||||
// Wait for the workflow to complete
|
||||
state = await daprClient.WaitForWorkflowCompletionAsync(
|
||||
instanceId: orderId,
|
||||
workflowComponent: DaprWorkflowComponent);
|
||||
|
||||
Console.WriteLine("Workflow Status: {0}", state.RuntimeStatus);
|
||||
```
|
||||
|
||||
#### `order-processor/Workflows/OrderProcessingWorkflow.cs`
|
||||
|
||||
In `OrderProcessingWorkflow.cs`, the workflow is defined as a class with all of its associated tasks (determined by workflow activities).
|
||||
|
||||
```csharp
|
||||
using Dapr.Workflow;
|
||||
//...
|
||||
|
||||
class OrderProcessingWorkflow : Workflow<OrderPayload, OrderResult>
|
||||
{
|
||||
public override async Task<OrderResult> RunAsync(WorkflowContext context, OrderPayload order)
|
||||
{
|
||||
string orderId = context.InstanceId;
|
||||
|
||||
// Notify the user that an order has come through
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Received order {orderId} for {order.Quantity} {order.Name} at ${order.TotalCost}"));
|
||||
|
||||
string requestId = context.InstanceId;
|
||||
|
||||
// Determine if there is enough of the item available for purchase by checking the inventory
|
||||
InventoryResult result = await context.CallActivityAsync<InventoryResult>(
|
||||
nameof(ReserveInventoryActivity),
|
||||
new InventoryRequest(RequestId: orderId, order.Name, order.Quantity));
|
||||
|
||||
// If there is insufficient inventory, fail and let the user know
|
||||
if (!result.Success)
|
||||
{
|
||||
// End the workflow here since we don't have sufficient inventory
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Insufficient inventory for {order.Name}"));
|
||||
return new OrderResult(Processed: false);
|
||||
}
|
||||
|
||||
// There is enough inventory available so the user can purchase the item(s). Process their payment
|
||||
await context.CallActivityAsync(
|
||||
nameof(ProcessPaymentActivity),
|
||||
new PaymentRequest(RequestId: orderId, order.Name, order.Quantity, order.TotalCost));
|
||||
|
||||
try
|
||||
{
|
||||
// There is enough inventory available so the user can purchase the item(s). Process their payment
|
||||
await context.CallActivityAsync(
|
||||
nameof(UpdateInventoryActivity),
|
||||
new PaymentRequest(RequestId: orderId, order.Name, order.Quantity, order.TotalCost));
|
||||
}
|
||||
catch (TaskFailedException)
|
||||
{
|
||||
// Let them know their payment was processed
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Order {orderId} Failed! You are now getting a refund"));
|
||||
return new OrderResult(Processed: false);
|
||||
}
|
||||
|
||||
// Let them know their payment was processed
|
||||
await context.CallActivityAsync(
|
||||
nameof(NotifyActivity),
|
||||
new Notification($"Order {orderId} has completed!"));
|
||||
|
||||
// End the workflow with a success result
|
||||
return new OrderResult(Processed: true);
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
#### `order-processor/Activities` directory
|
||||
|
||||
The `Activities` directory holds the four workflow activities used by the workflow, defined in the following files:
|
||||
- `NotifyActivity.cs`
|
||||
- `ReserveInventoryActivity.cs`
|
||||
- `ProcessPaymentActivity.cs`
|
||||
- `UpdateInventoryActivity.cs`
|
||||
|
||||
{{% /codetab %}}
|
||||
|
||||
<!-- Java -->
|
||||
{{% codetab %}}
|
||||
|
||||
The `order-processor` console app starts and manages the lifecycle of an order processing workflow that stores and retrieves data in a state store. The workflow consists of four workflow activities, or tasks:
|
||||
-
|
||||
|
||||
|
||||
### Step 1: Pre-requisites
|
||||
|
||||
For this example, you will need:
|
||||
|
||||
- [Dapr CLI and initialized environment](https://docs.dapr.io/getting-started).
|
||||
- Java JDK 11 (or greater):
|
||||
- [Oracle JDK](https://www.oracle.com/java/technologies/downloads), or
|
||||
- OpenJDK
|
||||
- [Apache Maven](https://maven.apache.org/install.html), version 3.x.
|
||||
<!-- IGNORE_LINKS -->
|
||||
- [Docker Desktop](https://www.docker.com/products/docker-desktop)
|
||||
<!-- END_IGNORE -->
|
||||
|
||||
### Step 2: Set up the environment
|
||||
|
||||
Clone the [sample provided in the Quickstarts repo](https://github.com/dapr/quickstarts/tree/master/workflows).
|
||||
|
||||
```bash
|
||||
git clone https://github.com/dapr/quickstarts.git
|
||||
```
|
||||
|
||||
In a new terminal window, navigate to the `order-processor` directory:
|
||||
|
||||
```bash
|
||||
need
|
||||
```
|
||||
|
||||
### Step 3: Run the order processor app
|
||||
|
||||
In the terminal, start the order processor app alongside a Dapr sidecar:
|
||||
|
||||
```bash
|
||||
need
|
||||
```
|
||||
|
||||
This starts the `order-processor` app with unique workflow ID and runs the workflow activities.
|
||||
|
||||
Expected output:
|
||||
|
||||
```
|
||||
need
|
||||
```
|
||||
|
||||
### (Optional) Step 4: View in Zipkin
|
||||
|
||||
If you have Zipkin configured for Dapr locally on your machine, you can view the workflow trace spans in the Zipkin web UI (typically at `http://localhost:9411/zipkin/`).
|
||||
|
||||
<img src="/images/workflow-trace-spans-zipkin.png" width=800 style="padding-bottom:15px;">
|
||||
|
||||
### What happened?
|
||||
|
||||
When you ran `need`:
|
||||
|
||||
1. A unique order ID for the workflow is generated (in the above example, `need`) and the workflow is scheduled.
|
||||
1. The `need` workflow activity sends a notification saying an order for 10 cars has been received.
|
||||
1. The `need` workflow activity checks the inventory data, determines if you can supply the ordered item, and responds with the number of cars in stock.
|
||||
1. Your workflow starts and notifies you of its status.
|
||||
1. The `need` workflow activity begins processing payment for order `need` and confirms if successful.
|
||||
1. The `need` workflow activity updates the inventory with the current available cars after the order has been processed.
|
||||
1. The `need` workflow activity sends a notification saying that order `need` has completed.
|
||||
1. The workflow terminates as completed.
|
||||
|
||||
#### `order-processor/... need`
|
||||
|
||||
In the application's program file:
|
||||
- The unique workflow order ID is generated
|
||||
- The workflow is scheduled
|
||||
- The workflow status is retrieved
|
||||
- The workflow and the workflow activities it invokes are registered
|
||||
|
||||
```java
|
||||
need
|
||||
```
|
||||
|
||||
#### `order-processor/... need`
|
||||
|
||||
In `need`, the workflow is defined as a class with all of its associated tasks (determined by workflow activities).
|
||||
|
||||
```java
|
||||
need
|
||||
```
|
||||
|
||||
#### `order-processor/... need` directory
|
||||
|
||||
The `Activities` directory holds the four workflow activities used by the workflow, defined in the following files:
|
||||
- `need`
|
||||
|
||||
{{% /codetab %}}
|
||||
|
||||
{{< /tabs >}}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue