I'm playing with GAE hooks and trying to follow Nick's blog post. But apparently it's somewhat outdated because it doesn't have implementation of makeAsyncCall which exists in my GAE SDK 1.6.1.
Here is snippet of my code
public class MultiTenantHook implements Delegate
{
#Override
public Future<byte[]> makeAsyncCall(final Environment env, final String pkgName, final String method, final byte[] request, ApiProxy.ApiConfig config)
{
Callable<byte[]> callable = new Callable<byte[]>()
{
#Override
public byte[] call() throws Exception
{
return makeSyncCall(env, pkgName, method, request);
}
};
FutureTask<byte[]> task = new FutureTask<byte[]>(callable);
return task;
}
}
This method is being called but returned Future<> is never used by GAE. call() method of inner class is never executed.
Do you know how to make it work?
Related
I want to use a non serializable object in stream.map() like this
stream.map { i =>
val obj = new SomeUnserializableClass()
obj.doSomething(i)
}
It is very inefficient, because I create many SomeUnserializableClass instance. Actually, it can be created only once in each worker.
In Spark, I can use mapPartition to do this. But in flink stream api, I don't known.
If you are dealing with a non serializable class what I recommend you is to create a RichFunction. In your case a RichMapFunction.
A Rich operator in Flink has a open method that is executed in the taskmanager just one time as initializer.
So the trick is to make your field transient and instantiate it in your open method.
Check below example:
public class NonSerializableFieldMapFunction extends RichMapFunction {
transient SomeUnserializableClass someUnserializableClass;
#Override
public void open(Configuration parameters) throws Exception {
super.open(parameters);
this.someUnserializableClass = new SomeUnserializableClass();
}
#Override
public Object map(Object o) throws Exception {
return someUnserializableClass.doSomething(o);
}
}
Then your code will looks like:
stream.map(new NonSerializableFieldMapFunction())
P.D: I'm using java syntax, please adapt it to scala.
Hy all,
suppose I have to following production code:
from("file:/home/test/from/")
.setHeader("targetDynamicEndpoint", constant("file:/home/test/to/"))
.toD("${header.targetDynamicEndpoint}")
How would I be able to mock the producer endpoint ('toD')?
I would be able to guess the string passed to the 'toD', because its set via StringBoot properties
In a test you could use AdviceWith and call the method weaveByType
for example:
camelContext.getRouteDefinition("routeId").adviceWith(camelContext, new AdviceWithRouteBuilder() {
#Override
public void configure() {
weaveByType(ToDynamicDefinition.class).replace().to("mock:someMock")
}
});
MockEndpoint someMockEndpoint = camelContext.getEndpoint("mock:someMock", MockEndpoint.class);
or you could even give the producer endpoint an id and use the method weaveById
I have an issue finding the exception cause in FallBackFactory, mine is a old application, so i can not use spring cloud approach (with annotations etc..)
I found the below solution, but still not working for me:
Issue in getting cause in HystrixFeign client fallback
Here is the code i have:
public static class ProfileFallbackFactory implements ProfileProxy, FallbackFactory<ProfileFallbackFactory> {
final Throwable cause;
public ProfileFallbackFactory() {
this(null);
}
ProfileFallbackFactory(Throwable cause) {
this.cause = cause;
}
#Override
public ProfileFallbackFactory create(Throwable cause) {
LOG.info("Profile fallback create "+cause);
return new ProfileFallbackFactory(cause);
}
public Profile getProfile(String id) {
}
instance creation:
profileProxy = new HystrixFeign.Builder().setterFactory(new CustomSetterFactory())
.decode404()
.decoder(new GsonDecoder(gsonWithDateFormat))
.encoder(new GsonEncoder(gsonWithDateFormat))
.errorDecoder(new profileProxyErrorDecoder())
.target(ProfileProxy.class,profileServiceUrl, (FallbackFactory<ProfileFallbackFactory>)new ProfileFallbackFactory());
There is a logger added in ProfileProxyErrorDecoder class, but this logger is not found in logs. I can see com.netflix.hystrix.exception.HystrixRuntimeException in server logs
Can someone please point me where i am going wrong?
I'm trying to put together my first Akka/Camel application from "scratch" (read, "noob") using the following lib versions:
akka-camel: 2.2.0-RC1
According to all of the documentation I can find (Akka docs, user groups, etc.) all I have to do to consume from a file-based queue is set up my system this way:
Main class:
actorSystem = ActorSystem.create("my-system");
Props props = new Props(Supervisor.class);
ActorRef supervisor = actorSystem.actorOf(props, "supervisor");
Camel camel = CamelExtension.get(actorSystem);
CamelContext camelContext = camel.context();
camelContext.start();
Supervisor class:
import akka.actor.ActorRef;
import akka.actor.Props;
import akka.camel.javaapi.UntypedConsumerActor;
import org.apache.camel.Message;
/**
* Manages creation and supervision of UploadBatchWorkers.
*/
public class Supervisor extends UntypedConsumerActor {
#Override
public String getEndpointUri() {
return "file:///Users/myhome/queue";
}
#Override
public void preStart() {
String test = "test";
}
#Override
public void onReceive(Object message) {
if (message instanceof CamelMessage) {
// do something
}
}
My problem is that even though I know the supervisor object is being created and breaks during debugging on the preStart() method's "test" line (not to mention that if I explicitly "tell" it something it processes fine), it does not consume from the defined endpoint, even though I have another application producing messages to the same endpoint.
Any idea what I'm doing wrong?
Ok, the problem was my own fault and is clearly visible in the example code if you look at the Consumer trait from which the UntypedConsumerActor inherits.
This method:
#Override
public void preStart() {
String test = "test";
}
overrides its parent's preStart() method, right? Well, that parent method is actually the one that registers the consumer with the on-the-fly created endpoint, so while you can override it, you must call super() or it will not work.
Hope this is useful to someone down the road!
Try changing your instanceof inside of onReceive to this:
if (message instanceof CamelMessage){
//do processing here
}
Where CamelMessage is from package akka.camel. That's what the examples in the akka camel docs are doing.
I have a need to pass an HTTP header for each an every RIA Service request being made from a Silverlight app. The value of the header needs to come from the app instance, and not from a cookie. I know this can be accomplished by putting it in the DTOs, but it's not an option because a lot of our service calls use Entities and change sets, so there's no base class to tie into for all requests. So I'm looking for a centralized and safe means to pass something back with each request so the developers do not have to worry with it. A custom HTTP header would work fine, but I don't know how to intercept the outbound request to set it.
Anyone have any ideas I can try?
On the lower level you can add HTTP headers with the help of an IClientMessageInspector. Try starting from this post on SL forum.
The next step depends on your use cases.
If the value of the header must be the same for any method called by the DomainContext, then you may just extend the context using partial class, add a property for the header value and use that property in the inspector.
If you need to pass a different value for each method call, you'd probably need to wrap your DomainContext into another class and add an argument to each method of the context that will accept the header value and pass it to the inspector somehow. Needless to say, without a code-generator this would be hard.
Here's an adapted sample from the SL forum for the first case:
public sealed partial class MyDomainContext
{
public string HeaderValue { get; set; }
partial void OnCreated()
{
WebDomainClient<IMyDomainServiceContract> webDomainClient = (WebDomainClient<IMyDomainServiceContract>)DomainClient;
CustomHeaderEndpointBehavior customHeaderEndpointBehavior = new CustomHeaderEndpointBehavior(this);
webDomainClient.ChannelFactory.Endpoint.Behaviors.Add(customHeaderEndpointBehavior);
}
}
public class CustomHeaderEndpointBehavior : IEndpointBehavior
{
MyDomainContext _Ctx;
public CustomHeaderEndpointBehavior(MyDomainContext ctx)
{
this._Ctx = ctx;
}
public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { }
public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
{
clientRuntime.MessageInspectors.Add(new CustomHeaderMessageInspector(this._Ctx));
}
public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher) { }
public void Validate(ServiceEndpoint endpoint) { }
}
public class CustomHeaderMessageInspector : IClientMessageInspector
{
MyDomainContext _Ctx;
public CustomHeaderMessageInspector(MyDomainContext ctx)
{
this._Ctx = ctx;
}
public void AfterReceiveReply(ref System.ServiceModel.Channels.Message reply, object correlationState) {}
public object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, IClientChannel channel)
{
string myHeaderName = "X-Foo-Bar";
string myheaderValue = this._Ctx.HeaderValue;
HttpRequestMessageProperty property = (HttpRequestMessageProperty)request.Properties[HttpRequestMessageProperty.Name];
property.Headers[myHeaderName] = myheaderValue;
return null;
}
}