在C#
WebJob中,我能够手动调用这样的公共静态类方法:
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Host;
namespace foo
{
public class Program
{
[NoAutomaticTrigger]
public static void Go(TraceWriter log) { ... }
static void Main()
{
var host = new JobHost();
var methodInfo = typeof(Program).GetMethod("Go");
host.Call(methodInfo);
host.RunAndBlock();
}
methodInfo是一个System.Reflection.MethodInfo,在调试器中我可以看到它有属性Public |静态| HideBySig和CustomAttributes Microsoft.Azure.WebJobs.NoAutomaticTriggerAttribute.
我想在F#中这样做.这是我到目前为止所拥有的:
type Foo() =
[<NoAutomaticTrigger>]
static member Go (log:TraceWriter) =
log.Info "hello!"
[<EntryPoint>]
let main argv =
let theType = typedefof<Foo>
let methodInfo = theType.GetMethods() |> Seq.find(fun t -> t.Name = "Go")
host.Call(methodInfo)
host.RunAndBlock()
WebJobs运行时不喜欢它:
System.InvalidOperationException
HResult=0x80131509
Message='Void Go(Microsoft.Azure.WebJobs.Host.TraceWriter)' can't be invoked from Azure WebJobs SDK. Is it missing Azure WebJobs SDK attributes?
Source=Microsoft.Azure.WebJobs.Host
StackTrace:
at Microsoft.Azure.WebJobs.JobHost.Validate(IFunctionDefinition function, Object key)
at Microsoft.Azure.WebJobs.JobHost.<CallAsyncCore>d__37.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.WebJobs.JobHost.Call(MethodInfo method)
at Program.main(String[] argv) in C:\path\to\project\Program.fs:line 110
我的F#methodInfo确实有NoAutomaticTrigger属性.它还有Public和Static,但它缺少HideBySig.那可能很重要吗?我应该比较MethodInfos的其他部分吗?
这是webjobs sdk:https://github.com/Azure/azure-webjobs-sdk/blob/v2.2.0/src/Microsoft.Azure.WebJobs.Host/JobHost.cs#L306的相关来源
为了它的价值,我已经能够成功使用F#中的TimerTrigger和ServiceBusTrigger;这只是我正在努力的手动调用模式.
接下来我打算筛选webjobs源代码并尝试弄清楚它正在寻找什么,但我希望有一些显而易见的人对F#和/或webjobs更有经验可以告诉我.
最佳答案 通过WebJobs源进行调试,我最终结束了
DefaultTypeLocator,它选择标记为
IsPublic的类.我尝试了我的F#声明,但似乎无法实现;我只设法生产
IsNestedPublic.
所以我尝试了另一种方法:我没有尝试编写现有WebJobs运行时可发现的F#函数,而是覆盖了发现逻辑:
type myTypeLocator() =
interface ITypeLocator with
member this.GetTypes () =
new System.Collections.Generic.List<Type>([ typedefof<Foo> ]) :> IReadOnlyList<Type>
…
let config = new JobHostConfiguration (
DashboardConnectionString = dashboardConnectionString,
StorageConnectionString = storageConnectionString,
TypeLocator = new myTypeLocator()
)
let host = new JobHost(config)
这很有用:我的功能被发现,我可以JobHost.Call他们.