Add start delay sample

start-delay/README.md

@@ -0,0 +1,12 @@
+This sample demonstrates how to setup a workflow to start after a delay.
+
+### Steps to run this sample:
+1) Run a [Temporal service](https://github.com/temporalio/samples-go/tree/main/#how-to-use).
+2) Run the following command to start the worker
+```
+go run start-delay/worker/main.go
+```
+3) Run the following command to start the example
+```
+go run start-delay/starter/main.go
+```

start-delay/starter/main.go

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+package main
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"github.com/pborman/uuid"
+	"github.com/temporalio/samples-go/helloworld"
+	"go.temporal.io/sdk/client"
+)
+
+func main() {
+	// The client is a heavyweight object that should be created once per process.
+	c, err := client.Dial(client.Options{
+		HostPort: client.DefaultHostPort,
+	})
+	if err != nil {
+		log.Fatalln("Unable to create client", err)
+	}
+	defer c.Close()
+
+	workflowOptions := client.StartWorkflowOptions{
+		ID:        "startdelay_" + uuid.New(),
+		TaskQueue: "startdelay",
+		// The first workflow task will be dispatched in 5 minutes
+		StartDelay: 5 * time.Minute,
+	}
+
+	we, err := c.ExecuteWorkflow(context.Background(), workflowOptions, helloworld.Workflow, "from a delayed workflow")
+	if err != nil {
+		log.Fatalln("Unable to execute workflow", err)
+	}
+	// ExecuteWorkflow will return immediately, but the workflow won't start executing till the StartDelay expires.
+	log.Println("Scheduled workflow", "WorkflowID", we.GetID(), "RunID", we.GetRunID())
+}

start-delay/worker/main.go

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+package main
+
+import (
+	"log"
+
+	"go.temporal.io/sdk/client"
+	"go.temporal.io/sdk/worker"
+
+	"github.com/temporalio/samples-go/helloworld"
+)
+
+func main() {
+	// The client and worker are heavyweight objects that should be created once per process.
+	c, err := client.Dial(client.Options{
+		HostPort: client.DefaultHostPort,
+	})
+	if err != nil {
+		log.Fatalln("Unable to create client", err)
+	}
+	defer c.Close()
+
+	w := worker.New(c, "startdelay", worker.Options{})
+
+	w.RegisterWorkflow(helloworld.Workflow)
+	w.RegisterActivity(helloworld.Activity)
+
+	err = w.Run(worker.InterruptCh())
+	if err != nil {
+		log.Fatalln("Unable to start worker", err)
+	}
+}