As funções de orquestrador podem chamar outras funções de orquestrador como suborquestrações. Uma suborquestração executa-se como filha do orquestrador de chamada (pai) e comporta-se como uma atividade do ponto de vista do orquestrador de chamada: pode retornar um valor, lançar exceções capturadas pelo orquestrador pai e suportar retentativas automáticas.
Quando usar suborquestrações
Use suborquestrações quando precisar:
-
Construir blocos de construção de fluxo de trabalho reutilizáveis: Extrair um fluxo de trabalho multietapa num orquestrador separado para que múltiplas orquestrações principais o possam chamar.
-
Distribua orquestrações em paralelo: Agende várias instâncias do mesmo orquestrador simultaneamente e aguarde que todas terminem.
-
Organize fluxos de trabalho complexos: Divide uma orquestração grande em peças nomeadas e testáveis em vez de uma única função longa.
Observação
As suborquestrações devem ser definidas na mesma aplicação que a orquestração principal. Para chamar orquestrações numa aplicação diferente, use o padrão de sondagem HTTP 202 em vez disso. Para mais informações, veja funcionalidades HTTP.
Neste artigo:
Defina uma suborquestração
O exemplo seguinte ilustra um cenário de IoT em que vários dispositivos precisam de ser configurados. A função representa o fluxo de trabalho de configuração que é executado para cada dispositivo:
Modelo de trabalhador isolado
public static async Task DeviceProvisioningOrchestration(
[OrchestrationTrigger] TaskOrchestrationContext context, string deviceId)
{
// Step 1: Create an installation package in blob storage and return a SAS URL.
Uri sasUrl = await context.CallActivityAsync<Uri>("CreateInstallationPackage", deviceId);
// Step 2: Notify the device that the installation package is ready.
await context.CallActivityAsync("SendPackageUrlToDevice", (deviceId, sasUrl));
// Step 3: Wait for the device to acknowledge that it has downloaded the new package.
await context.WaitForExternalEvent<bool>("DownloadCompletedAck");
// Step 4: ...
}
Modelo em processo
public static async Task DeviceProvisioningOrchestration(
[OrchestrationTrigger] IDurableOrchestrationContext context)
{
string deviceId = context.GetInput<string>();
// Step 1: Create an installation package in blob storage and return a SAS URL.
Uri sasUrl = await context.CallActivityAsync<Uri>("CreateInstallationPackage", deviceId);
// Step 2: Notify the device that the installation package is ready.
await context.CallActivityAsync("SendPackageUrlToDevice", Tuple.Create(deviceId, sasUrl));
// Step 3: Wait for the device to acknowledge that it has downloaded the new package.
await context.WaitForExternalEvent<bool>("DownloadCompletedAck");
// Step 4: ...
}
const df = require("durable-functions");
df.app.orchestration("deviceProvisioningOrchestration", function* (context) {
const deviceId = context.df.getInput();
// Step 1: Create an installation package in blob storage and return a SAS URL.
const sasUrl = yield context.df.callActivity("createInstallationPackage", deviceId);
// Step 2: Notify the device that the installation package is ready.
yield context.df.callActivity("sendPackageUrlToDevice", { id: deviceId, url: sasUrl });
// Step 3: Wait for the device to acknowledge that it has downloaded the new package.
yield context.df.waitForExternalEvent("downloadCompletedAck");
// Step 4: ...
});
import azure.functions as func
import azure.durable_functions as df
def orchestrator_function(context: df.DurableOrchestrationContext):
device_id = context.get_input()
# Step 1: Create an installation package in blob storage and return a SAS URL.
sas_url = yield context.call_activity("CreateInstallationPackage", device_id)
# Step 2: Notify the device that the installation package is ready.
yield context.call_activity("SendPackageUrlToDevice", { "id": device_id, "url": sas_url })
# Step 3: Wait for the device to acknowledge that it has downloaded the new package.
yield context.call_activity("DownloadCompletedAck")
# Step 4: ...
param($Context)
$deviceId = $Context.Input
# Step 1: Create an installation package in blob storage and return a SAS URL.
$sasUrl = Invoke-DurableActivity -FunctionName "CreateInstallationPackage" -Input $deviceId
# Step 2: Notify the device that the installation package is ready.
$deviceInfo = @{
id = $deviceId
url = $sasUrl
}
Invoke-DurableActivity -FunctionName "SendPackageUrlToDevice" -Input $deviceInfo
# Step 3: Wait for the device to acknowledge that it has downloaded the new package.
Start-DurableExternalEventListener -EventName "DownloadCompletedAck"
# Step 4: ...
@FunctionName("DeviceProvisioningOrchestration")
public void deviceProvisioningOrchestration(
@DurableOrchestrationTrigger(name = "ctx") TaskOrchestrationContext ctx) {
// Step 1: Create an installation package in blob storage and return a SAS URL.
String deviceId = ctx.getInput(String.class);
String blobUri = ctx.callActivity("CreateInstallPackage", deviceId, String.class).await();
// Step 2: Notify the device that the installation package is ready.
String[] args = { deviceId, blobUri };
ctx.callActivity("SendPackageUrlToDevice", args).await();
// Step 3: Wait for the device to acknowledge that it has downloaded the new package.
ctx.waitForExternalEvent("DownloadCompletedAck").await();
// Step 4: ...
}
using Microsoft.DurableTask;
[DurableTask]
public class DeviceProvisioningOrchestration : TaskOrchestrator<string, object?>
{
public override async Task<object?> RunAsync(TaskOrchestrationContext context, string deviceId)
{
// Step 1: Create an installation package in blob storage and return a SAS URL.
Uri sasUrl = await context.CallActivityAsync<Uri>("CreateInstallationPackage", deviceId);
// Step 2: Notify the device that the installation package is ready.
await context.CallActivityAsync("SendPackageUrlToDevice", (deviceId, sasUrl.ToString()));
// Step 3: Wait for the device to acknowledge that it has downloaded the new package.
await context.WaitForExternalEvent<bool>("DownloadCompletedAck");
// Step 4: ...
return null;
}
}
import { OrchestrationContext, TOrchestrator } from "@microsoft/durabletask-js";
const deviceProvisioningOrchestrator: TOrchestrator = async function* (
ctx: OrchestrationContext,
deviceId: string
): any {
// Step 1: Create an installation package in blob storage and return a SAS URL.
const sasUrl: string = yield ctx.callActivity(createInstallationPackage, deviceId);
// Step 2: Notify the device that the installation package is ready.
yield ctx.callActivity(sendPackageUrlToDevice, { id: deviceId, url: sasUrl });
// Step 3: Wait for the device to acknowledge that it has downloaded the new package.
yield ctx.waitForExternalEvent("DownloadCompletedAck");
// Step 4: ...
};
from durabletask import task
def device_provisioning_orchestrator(ctx: task.OrchestrationContext, device_id: str):
# Step 1: Create an installation package in blob storage and return a SAS URL.
sas_url = yield ctx.call_activity("create_installation_package", input=device_id)
# Step 2: Notify the device that the installation package is ready.
yield ctx.call_activity("send_package_url_to_device", input={"id": device_id, "url": sas_url})
# Step 3: Wait for the device to acknowledge that it has downloaded the new package.
yield ctx.wait_for_external_event("DownloadCompletedAck")
# Step 4: ...
Este exemplo é mostrado para .NET, JavaScript, Java e Python.
import com.microsoft.durabletask.TaskOrchestration;
import com.microsoft.durabletask.TaskOrchestrationContext;
public class DeviceProvisioningOrchestration implements TaskOrchestration {
@Override
public void run(TaskOrchestrationContext ctx) {
String deviceId = ctx.getInput(String.class);
// Step 1: Create an installation package in blob storage and return a SAS URL.
String blobUri = ctx.callActivity("CreateInstallPackage", deviceId, String.class).await();
// Step 2: Notify the device that the installation package is ready.
String[] args = { deviceId, blobUri };
ctx.callActivity("SendPackageUrlToDevice", args).await();
// Step 3: Wait for the device to acknowledge that it has downloaded the new package.
ctx.waitForExternalEvent("DownloadCompletedAck").await();
// Step 4: ...
}
}
Esta função do orquestrador pode funcionar de forma autónoma para configuração pontual de dispositivos, ou um orquestrador pai pode agendá-la como uma sub-orquestração usando a API de chamada de sub-orquestrador .
Executar suborquestrações em paralelo
O exemplo seguinte mostra um orquestrador pai que distribui múltiplas suborquestrações em paralelo. Algumas linguagens usam um ID de instância filho determinístico (derivado do ID de instância do pai mais um índice) para evitar suborquestrações duplicadas durante a reprodução.
Modelo de trabalhador isolado
[Function("ProvisionNewDevices")]
public static async Task ProvisionNewDevices(
[OrchestrationTrigger] TaskOrchestrationContext context)
{
string[] deviceIds = await context.CallActivityAsync<string[]>("GetNewDeviceIds");
// Run multiple device provisioning flows in parallel
var provisioningTasks = new List<Task>();
foreach (string deviceId in deviceIds)
{
Task provisionTask = context.CallSubOrchestratorAsync("DeviceProvisioningOrchestration", deviceId);
provisioningTasks.Add(provisionTask);
}
await Task.WhenAll(provisioningTasks);
// ...
}
Modelo em processo
[FunctionName("ProvisionNewDevices")]
public static async Task ProvisionNewDevices(
[OrchestrationTrigger] IDurableOrchestrationContext context)
{
string[] deviceIds = await context.CallActivityAsync<string[]>("GetNewDeviceIds");
// Run multiple device provisioning flows in parallel
var provisioningTasks = new List<Task>();
foreach (string deviceId in deviceIds)
{
Task provisionTask = context.CallSubOrchestratorAsync("DeviceProvisioningOrchestration", deviceId);
provisioningTasks.Add(provisionTask);
}
await Task.WhenAll(provisioningTasks);
// ...
}
const df = require("durable-functions");
df.app.orchestration("provisionNewDevices", function* (context) {
const deviceIds = yield context.df.callActivity("getNewDeviceIds");
// Run multiple device provisioning flows in parallel
const provisioningTasks = [];
var id = 0;
for (const deviceId of deviceIds) {
const child_id = context.df.instanceId + `:${id}`;
const provisionTask = context.df.callSubOrchestrator(
"deviceProvisioningOrchestration",
deviceId,
child_id
);
provisioningTasks.push(provisionTask);
id++;
}
yield context.df.Task.all(provisioningTasks);
// ...
});
import azure.functions as func
import azure.durable_functions as df
def orchestrator_function(context: df.DurableOrchestrationContext):
device_IDs = yield context.call_activity("GetNewDeviceIds")
# Run multiple device provisioning flows in parallel
provisioning_tasks = []
id_ = 0
for device_id in device_IDs:
child_id = f"{context.instance_id}:{id_}"
provision_task = context.call_sub_orchestrator("DeviceProvisioningOrchestration", device_id, child_id)
provisioning_tasks.append(provision_task)
id_ += 1
yield context.task_all(provisioning_tasks)
# ...
param($Context)
$deviceIds = Invoke-DurableActivity -FunctionName "GetNewDeviceIds"
# Run multiple device setting up flows in parallel
$provisioningTasks = @()
for ($i = 0; $i -lt $deviceIds.Count; $i++) {
$deviceId = $deviceIds[$i]
$childId = "$($Context.InstanceId):$i"
$provisionTask = Invoke-DurableSubOrchestrator `
-FunctionName "DeviceProvisioningOrchestration" `
-Input $deviceId `
-InstanceId $childId `
-NoWait
$provisioningTasks += $provisionTask
}
Wait-DurableTask -Task $provisioningTasks
# ...
@FunctionName("ProvisionNewDevices")
public void provisionNewDevices(
@DurableOrchestrationTrigger(name = "ctx") TaskOrchestrationContext ctx) {
List<?> deviceIDs = ctx.getInput(List.class);
// Schedule each device provisioning sub-orchestration to run in parallel
List<Task<Void>> parallelTasks = deviceIDs.stream()
.map(device -> ctx.callSubOrchestrator("DeviceProvisioningOrchestration", device))
.collect(Collectors.toList());
// ...
}
Passos seguintes
using Microsoft.DurableTask;
[DurableTask]
public class ProvisionNewDevices : TaskOrchestrator<object?, object?>
{
public override async Task<object?> RunAsync(TaskOrchestrationContext context, object? input)
{
string[] deviceIds = await context.CallActivityAsync<string[]>("GetNewDeviceIds");
// Run multiple device provisioning flows in parallel
var provisioningTasks = new List<Task>();
foreach (string deviceId in deviceIds)
{
Task provisionTask = context.CallSubOrchestratorAsync("DeviceProvisioningOrchestration", deviceId);
provisioningTasks.Add(provisionTask);
}
await Task.WhenAll(provisioningTasks);
return null;
}
}
import { OrchestrationContext, TOrchestrator, whenAll } from "@microsoft/durabletask-js";
const provisionNewDevices: TOrchestrator = async function* (ctx: OrchestrationContext): any {
const deviceIds: string[] = yield ctx.callActivity(getNewDeviceIds);
// Run multiple device provisioning flows in parallel
const provisioningTasks = deviceIds.map((deviceId: string) =>
ctx.callSubOrchestrator(deviceProvisioningOrchestrator, deviceId)
);
yield whenAll(provisioningTasks);
};
from durabletask import task
def provision_new_devices(ctx: task.OrchestrationContext, _):
device_ids = yield ctx.call_activity("get_new_device_ids")
# Run multiple device provisioning flows in parallel
provisioning_tasks = []
for device_id in device_ids:
provision_task = ctx.call_sub_orchestrator(device_provisioning_orchestrator, input=device_id)
provisioning_tasks.append(provision_task)
yield task.when_all(provisioning_tasks)
Este exemplo é mostrado para .NET, JavaScript, Java e Python.
import com.microsoft.durabletask.TaskOrchestration;
import com.microsoft.durabletask.TaskOrchestrationContext;
public class ProvisionNewDevices implements TaskOrchestration {
@Override
public void run(TaskOrchestrationContext ctx) {
List<?> deviceIDs = ctx.getInput(List.class);
// Schedule each device provisioning sub-orchestration to run in parallel
List<Task<Void>> parallelTasks = deviceIDs.stream()
.map(device -> ctx.callSubOrchestrator("DeviceProvisioningOrchestration", device))
.collect(Collectors.toList());
ctx.allOf(parallelTasks).await();
}
}
Passos seguintes