除了呼叫活動函式之外，協調器函式還可以呼叫其他協調器函式。 例如，您可以從更小的協調器函式程式庫中編譯更大的協調流程。 或者，您可以平行執行協調器函式的多個實例。
協調器函式可以使用 「call-sub-orchestrator」 API 呼叫另一個協調器函式。
錯誤處理與補償一文提供自動重試的詳細資訊。
子協調器函式的行為就像從呼叫端的觀點來看的活動函式一樣。 它們可以傳回值，並擲回例外狀況，因為父協調器函式預期會出現這些情況。
備註
Azure Functions Node.js 程式設計模型的第 4 版已正式推出。 v4 模型旨在為 JavaScript 與 TypeScript 開發者提供更靈活且直覺的使用體驗。 關於 v3 與 v4 差異的更多資訊，請參閱 遷移指南。
在以下程式碼片段中，JavaScript（PM4）代表程式設計模型 v4，即新體驗。
範例
下列範例說明需要布建多個裝置的IoT （「物聯網」） 案例。 下列函式代表必須針對每個裝置執行的布建工作流程：
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: ...
}
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: ...
}
const df = require("durable-functions");
module.exports = df.orchestrator(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: ...
});
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: ...
@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: ...
}
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 $deviceInfo
# Step 3: Wait for the device to acknowledge that it has downloaded the new package.
Start-DurableExternalEventListener -EventName "DownloadCompletedAck"
# Step 4: ...
此協調器函式可用於一次性裝置布建 as-is，也可以是較大協調流程的一部分。 在後者的情況下，父協調器可以使用 DeviceProvisioningOrchestration API 來排程實例。
下列範例示範如何同時執行多個協調器函式：
[FunctionName("ProvisionNewDevices")]
public static async Task ProvisionNewDevices(
[OrchestrationTrigger] IDurableOrchestrationContext context)
{
string[] deviceIds = await context.CallActivityAsync<string[]>("GetNewDeviceIds");
// Run multiple device provisioning flows in parallel
var provisioningTasks = new List<Task>();
foreach (string deviceId in deviceIds)
{
Task provisionTask = context.CallSubOrchestratorAsync("DeviceProvisioningOrchestration", deviceId);
provisioningTasks.Add(provisionTask);
}
await Task.WhenAll(provisioningTasks);
// ...
}
備註
先前的 C# 範例適用於 Durable Functions 2.x。 針對 Durable Functions 1.x，您必須使用 DurableOrchestrationContext 而非 IDurableOrchestrationContext。 如需版本間差異的詳細資訊，請參閱 Durable Functions 版本 一文。
[FunctionName("ProvisionNewDevices")]
public static async Task ProvisionNewDevices(
[OrchestrationTrigger] TaskOrchestrationContext context)
{
string[] deviceIds = await context.CallActivityAsync<string[]>("GetNewDeviceIds");
// Run multiple device provisioning flows in parallel
var provisioningTasks = new List<Task>();
foreach (string deviceId in deviceIds)
{
Task provisionTask = context.CallSubOrchestratorAsync("DeviceProvisioningOrchestration", deviceId);
provisioningTasks.Add(provisionTask);
}
await Task.WhenAll(provisioningTasks);
// ...
}
const df = require("durable-functions");
module.exports = df.orchestrator(function*(context) {
const deviceIds = yield context.df.callActivity("GetNewDeviceIds");
// Run multiple device provisioning flows in parallel
const provisioningTasks = [];
var id = 0;
for (const deviceId of deviceIds) {
const child_id = context.df.instanceId+`:${id}`;
const provisionTask = context.df.callSubOrchestrator("DeviceProvisioningOrchestration", deviceId, child_id);
provisioningTasks.push(provisionTask);
id++;
}
yield context.df.Task.all(provisioningTasks);
// ...
});
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 + `:${id}`;
const provisionTask = context.df.callSubOrchestrator(
"deviceProvisioningOrchestration",
deviceId,
child_id
);
provisioningTasks.push(provisionTask);
id++;
}
yield context.df.Task.all(provisioningTasks);
// ...
});
import azure.functions as func
import azure.durable_functions as df
def orchestrator_function(context: df.DurableOrchestrationContext):
device_IDs = yield context.call_activity("GetNewDeviceIds")
# Run multiple device provisioning flows in parallel
provisioning_tasks = []
id_ = 0
for device_id in device_IDs:
child_id = f"{context.instance_id}:{id_}"
provision_task = context.call_sub_orchestrator("DeviceProvisioningOrchestration", device_id, child_id)
provisioning_tasks.append(provision_task)
id_ += 1
yield context.task_all(provisioning_tasks)
# ...
@FunctionName("ProvisionNewDevices")
public void provisionNewDevices(
@DurableOrchestrationTrigger(name = "ctx") TaskOrchestrationContext ctx) {
List<?> deviceIDs = ctx.getInput(List.class);
// Schedule each device provisioning sub-orchestration to run in parallel
List<Task<Void>> parallelTasks = deviceIDs.stream()
.map(device -> ctx.callSubOrchestrator("DeviceProvisioningOrchestration", device))
.collect(Collectors.toList());
// ...
}
param($Context)
$deviceIds = Invoke-DurableActivity -FunctionName "GetNewDeviceIds"
# Run multiple device provisioning 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
# ...
備註
子協調流程必須在與父協調流程相同的函式應用程式中定義。 如果您需要呼叫並等候另一個函數應用程式中的協調流程，請考慮使用 HTTP API 和 HTTP 202 輪詢取用者模式的內建支援。 如需詳細資訊，請參閱 HTTP 功能 主題。
後續步驟