I am writing a groovy code to get image/attachments from the MIME message and I want to use writeTo and writeBody methods in the MessageWriter class.
How do I turn off or override the decoding in writeTo and writeBody methods outputs in the MessageWriter class?
def instream = new ByteArrayInputStream(imageData.getBytes())
Message mimemsg =new Message(instream);
def ov2=new FileOutputStream(v)
MessageWriter wr=new MessageWriter()
wr2.writeBody(mimemsg.getBody(),ov2)
ov2.flush()
ov2.close()
Related
I'm trying to mock Http calls for unit test.
To do that I have done the following, I have created a RequestMock case class:
case class RequestMock() {
def sendRequest(httpRequest: HttpRequest)(implicit actorSystem: ActorSystem): Future[HttpResponse] = {
Http().singleRequest(httpRequest)
}
}
and in my service, I have written the following piece of code :
case class Service(requestHandler: RequestMock) {
....
for {
response <- {
requestHandler.sendRequest(
HttpRequest(
method = HttpMethods.GET,
uri = "http://database:9000"
)
)
} yield {
response
}
}
For the unit test, I'm trying to mock HttpCalls, to do that, I have done the following :
def test_2 = mock[RequestMock]
And for defining the mock behaviour I have done the following
when(test_2.sendRequest(
HttpRequest(
method = HttpMethods.GET,
uri = "http://database:9000")
)).thenReturn{
Future(
HttpResponse(
StatusCodes.OK,
entity = HttpEntity(ContentTypes.`text/plain(UTF-8)`,"connection established"))
But, when I execute unit tests, I always get the following error:
java.lang.NullPointerException
Does anyone know how I can solve this issue ?
A couple of problems.
First of all, test_2 should be a val, not a def.
With def like you have it, you get a different instance every time you access it. So, you define the stub on one instance, but then create your Service with a different one, that does not have sendRequest defined, so returns null by default, and that causes your NPE.
The next problem, that you will probably encounter after you fix this one is that you are not defining all of the behavior.
when(test_2.sendRequest(
HttpRequest(
method = HttpMethods.GET,
uri = "http://database:9000")
))
Only creates a stub for a method call with this specific parameter value. So, if your tests try to make a POST for example or hit a different endpoint, you'll get an NPE again.
Even if you only ever use one request, it is better to define the stub for any argument, to avoid weird NPE failures if the code happens to send a different one (you are writing a test, so should not just assume automatically, that the code will always do what you expect - you would not need the test in the first place if that was the case):
when(test2.sendRequest(any)),thenReturn(Future.successful(...))
(Note Future.successful above – that's the correct way to create Future that is immediately satisfied, what you are doing makes it run on a thread ... not a big deal in your case, but still icky).
Then, after the test code is run, you can check that the parameter value passed to the sendRequest was actually what you expect:
verify(test2)
.sendRequest(HttpRequest(method = HttpMethods.GET, uri = "http://database:9000"))
I have a requirement, I have a method, which takes another function. I want to get the result of this parameter function in my caller.
I have created a code snippet for this scenario:
class ProcessHandler {
def executeInstructions(x:String=>Array[String])
{
//print the resultant list here
}
}
object ProcessHandlerMain {
def main(args: Array[String]) {
val handler = new ProcessHandler
handler.executeInstructions( instruction)
}
def instruction(x:String):Array[String] =
{
List("words", "from", "book").toArray
}
}
This call handler.executeInstructions( instruction) will be made by another process. Here I am using main method to test it out.
Here is what I do not know:
How can I print the result of parameter function
If I have to expose this method executeInstructions() to client side, what is the best approach? Here we will not be passing text instructions, rather a function similar to instruction().
Thanks
Updated: From the response received, my code is updated to
class ProcessHandler {
def executeInstructions(x:String=>Array[String])
{
//print the resultant list here
val result = x("some string here")
//this array will be sent to another service
// dispatcher.dispatch(result)
}
}
My requirements are updated:
How can I print the result of parameter function : Done
If I have to expose this method executeInstructions() to client side, what is the best approach? Here we will not be passing text instructions, rather a function similar to instruction(). Pending
The client interface has will work as below:
1. client will be calling executeInstructions() remotely and pass function as parameter.
2. InstructionId will be passed to the injected function, the resultant array will be dispatched to another service.
I am making a multiplayer game client with ScalaFX GUI and Akka remoting for networking. When my client receives game data it stores it inside Model.gameData. I need my GUI to respond to this variable change.
I used gameData to create data:ObjectProperty in my Model object:
object Model {
var gameData:Option[GameData] = None
val data = new ObjectProperty(this,"data",Model.gameData)
...
}
drawGrid and drawPlayer are methods I use to update the GUI, located in CleintGUI object. I tired using addListener and onChange, they compile but the methods I placed inside of them are never invoked.
object ClientGUI extends JFXApp{
...
Model.data.addListener{ (o: javafx.beans.value.ObservableValue[_ <:Option[GameData]], oldVal: Option[GameData], newVal: Option[GameData]) =>
drawGrid
drawPlayer
}
Model.data onChange {
drawGrid
drawPlayer
}
}
What am I missing? Am I declaring data:ObectProperty or methods inside my ClientGUI incorrectly?
drawGrid and drawPlayer both work when I call them manually by creating an event through submitting a string in a TextField. When I receive GameData I also tried to directly call drawGrid and drawPlayer form inside of my actor class, but I got an error "Not an FX thread".
Edit: I got the GUI to update by mutating control attributes. However, ideally I would want to define the control attributes by using conditional expressions:
val data = new BooleanProperty(this,"data",Model.gameData.isDefined)
val msgLabel = new Label{
text <== when(data) choose " " otherwise "No GameData"
}
But this doesn't work as I can't figure out a way to define BooleanProperty such that when(data) changes value depending on boolean Model.gameData.isDefined
I was adding new elements to the GUI when I received gameData, by using GridPane.add method.
Instead of doing that I added all the controls(gui nodes/elements) during object creation and then changed their relevant attributes when I receive gameData.
e.g. I set Label.text from "No Game Data" to an empty string when I receive gameData:
def update {
ClientGUI.msgLabel = " "
}
I don't think this is the best approach as now I have publicly available vars in a multi threaded application, but since I only change them from one place when I receive new data it should be fine.
Ideally I would want to define the control attributes by using conditional expressions:
val data = new BooleanProperty(this,"data",Model.gameData.isDefined)
val msgLabel = new Label{
text <== when(data) choose " " otherwise "No GameData"
}
But this doesn't work as I can't figure out a way to define BooleanProperty such that when(data) changes value depending on boolean Model.gameData.isDefined
I can't find a way to create custom events with scala-js. For instance, with js you can create a custom event like the following (taken from here):
var event = new CustomEvent('build', { 'detail': elem.dataset.time });
However, there is no constructor for CustomerEvent or Event in scala-js that accept arguments. Also, subclassing either such as:
class DrawEvent extends Event {
override def `type` = "draw"
}
leads to
Uncaught TypeError: undefined is not a function
when trying to construct via new DrawEvent()
Any ideas?
To instantiate javascript classes in ScalaJs you have to use js.Dynamic.newInstance:
This should work for your use case:
val event = js.Dynamic.newInstance(js.Dynamic.global.CustomEvent)("build", js.Dynamic.literal(detail = elem.dataset.time)).asInstanceOf[js.dom.CustomEvent]
There is more info available at the remarks portion (all the way at the bottom) of:
http://www.scala-js.org/doc/calling-javascript.html
Here is the same solution using some imports to make it shorter
import js.Dynamic.{ global => g, newInstance => jsnew, literal => lit }
val event = jsnew(g.CustomEvent)("build", lit(detail = elem.dataset.time)).asInstanceOf[js.dom.CustomEvent]
If you want to stay in the typed DOM (assuming you are talking about the scala-js-dom library), you can do:
new CustomEvent().initCustomEvent('build', false, false, elem.dataset.time)
The constructor you are using is actually only specified in DOM 4 (see MDN).
Running a Play! app with Scala. I'm doing a request where the response is expected to be a JSON string. When checking the debugger, the JsonElement returns OK with all information as expected. However, the problem is when I try to actually run methods on that JsonElement.
val json = WS.url("http://maps.googleapis.com/maps/api/geocode/json?callback=?&sensor=true&address=%s", startAddress+","+startCity+","+startProvince).get.getJson
val geocoder = json.getAsString
The only error I get back is Unsupported Operation Exception: null and I've tried this on getAsString and getAsJsonObject and getAsJsonPrimitive
Any idea why it's failing on all methods? Thanks.
I had a similar problem and I had to change jsonObject.getAsString() to jsonObject.toString();
Maybe your JsonElement is a JsonNull
What you could do is to first check that it isn't by using json.isJsonNull
Otherwise, try to get its String representation with json.toString
In my case I just needed to get the element as an empty string if it is null, so I wrote a function like this:
private String getNullAsEmptyString(JsonElement jsonElement) {
return jsonElement.isJsonNull() ? "" : jsonElement.getAsString();
}
So instead of
val geocoder = json.getAsString
You can just use this
val geocoder = getNullAsEmptyString(json);
It returns "" if the element is null and the actual string if it is not
To add to #Henry's answer. In the spirit of Kotlins "OrNull" Adding an extension function:
fun JsonElement.asStringOrNull(): String? {
return if (isJsonNull) null else asString
}
The class JsonElement will throw Unsupported Operation Exception for any getAs<Type> method, because it's an abstract class and makes sense that it is implemented in this way.
For some reason the class JsonObject, does not implement the getAs<Type> methods, so any call to one of these methods will throw an exception.
Calling the toString method on a JsonElement object, may solve your issue in certain circumstances, but isn't probably what you want because it returns the json representation as String (e.g. \"value\") in some cases.
I found out that also a JsonPrimitive class exists and it does implement the getAs<Type> methods. So probably the correct way to proceed is something like this:
String input = "{\"key1\":\"value1\",\"key2\":\"value2\"}";
JsonParser parser = new JsonParser();
JsonElement jsonTree = parser.parse(input);
if(jsonTree != null && jsonTree.isJsonObject()) {
JsonObject jsonObject = jsonTree.getAsJsonObject();
value = jsonObject.get("key1").getAsJsonPrimitive().getAsString()
}
PS. I removed all the nullability mgmt part. If you are coding in Java you probably want to manage this in a better way.
see GitHub source code for JsonElement:
https://github.com/google/gson/blob/master/gson/src/main/java/com/google/gson/JsonElement.java#L178