i'm working Android App use Alljoyn framework and i have some prolem
i have a custom object
public class Package implements BusObject {
public static enum DataSendType {
TEXT,IMAGE
}
public static enum PackageStatus {
NONE, SENDING, DONE
}
#Signature("s")
private String m_id;
#Signature("a")
private ArrayList<DataPackage> m_listPackage;
#Signature("r")
private PackageStatus m_status;
#Signature("r")
private DataSendType m_type;
#Signature("s")
private String m_packageName;
}
and interface
#BusInterface (name="xxxx.simpleinterface")
public interface SimpleInterface {
#BusSignal (name="Chat", signature="o")
public void Chat(Package message) throws BusException;
}
but i get this error cannot marshal class Package into 'o' when use Chat(Package)..
pls help me, because i can't get this error out for 2 weeks.
sorry because my English is too bad :)
looking at your code it looks like what you are trying to send is a struct the signature for a struct should be "r" or the actual signature surrounded by parenthesizes ( and ). i.e. for Package the signature would be "(sayiis)"
With AllJoyn you can send an array but not an ArrayList and you must specify the type of data that is in the array.
Since your DataSendType specified TEXT or IMAGE I made the assumption that you want to send an array of bytes.
Most of the items I did not add a signature to because AllJoyn can figure out the signature using reflection. AllJoyn however does not know that enums will be transmitted as integers so I did have to specify the signature for the enums.
Package did not have to implement BusObject. In your code when you implement your SimpleInterface that should extend the SimpleInterface and `BusObject'
Anything sent using AllJoyn should be public so the interface can read the member variables.
public class Package {
public static enum DataSendType{
TEXT,
IMAGE
}
public static enum PackageStatus {
NONE,
SENDING,
DONE
}
#Position(0)
public String m_id;
#Position(1)
public byte[] m_listPackage;
#Position(2)
#Signature("i")
public PackageStatus m_status;
#Position(3)
#Signature("i")
public DataSendType m_type;
#Position(4)
public String m_packageName;
}
for the interface the signature should be "r" for struct the signature "o" means object path. This is an AllJoyn object path which means it just a string with path data.
#BusInterface (name="xxxx.simpleinterface")
public interface SimpleInterface {
#BusSignal (name="Chat", signature="r")
public void Chat(Package message) throws BusException;
}
If you really need to use an ArrayList convert the ArrayList to an actual array before sending the Chat signal.
Related
I want to return list of interfaces with different implementations by calling query/mutation in grpahql spqr.
For this purpose I suppose I need to use #GraphQLInterface.
Maybe I doing something wrong, but it not works.
I have spring-boot app 2.3.3.RELEASE with graphql-spqr-spring-boot-starter 0.0.4
There is my model:
public class ResponseDto {
...
List<IValidation> validations;
}
#GraphQLInterface(name = "ValidationError", implementationAutoDiscovery = true)
public interface ValidationError {
#GraphQLQuery(name = "message")
String getMessage();
}
#GraphQLType(name = "SimpleError")
#AllArgsConstructor
#Getter
public enum SimpleError implements ValidationError {
ERROR("some msg");
private String message;
}
But when I get graphql schema there is no any info about SimpleError and field message in ValidationError.
I also tried without GraphQLType and GraphQLQuery, it not works.
And I tried with no enum implementation also, same result.
Could anyone explain what I'm doing wrong?
Thank you.
I've a java binding for android which somewhat works bar the new feature I'm trying to integrate with. Only now I have realised that the intended callback is not happening. Here are the classes (decompiled to java) in question:
At the top level we have
public interface MyPackage {
MyPackage.Companion Companion = MyPackage.Companion.$$INSTANCE;
public static final class Companion {
#Nullable
private static MyEventHandler myEventHandler;
// $FF: synthetic field
static final MyPackage.Companion $$INSTANCE;
#Nullable
public final MyEventHandler getMyEventHandler() {
return myEventHandler;
}
public final void setMyEventHandler(#Nullable MyEventHandler var1) {
myEventHandler = var1;
}
private Companion() {
}
static {
MyPackage.Companion var0 = new MyPackage.Companion();
$$INSTANCE = var0;
}
}
}
MyEventHandler class:
public abstract class MyEventHandler {
public abstract void handleEvent(#NotNull String var1, #NotNull Properties var2);
}
Properties class:
import java.util.Map;
public class Properties extends r {
public Properties() {
}
Properties(Map<String, Object> var1) {
super(var1);
}
public Properties a(String var1, Object var2) {
super.b(var1, var2);
return this;
}
}
and the problematic r class:
public class r implements Map<String, Object> {
private final Map<String, Object> a;
various implementations...
}
So I noticed the issue when I couldnt override the HandleEvent method at the integration level and started looking at the Binding logs and found:
Warning=>
BINDINGSGENERATOR: Warning BG8801: Invalid parameter type MyPackage...Properties in method HandleEvent in managed type MyPackage.MyEventHandler. (BG8801)
And in build logs:
message BG0000: warning BG8102: Class MyPackage....Properties has unknown base type MyPackage....r.
warning BG8801: Invalid parameter type MyPackage...Properties in method HandleEvent in managed type MyPackage.MyEventHandler.
As it was obvious r is an obfuscated class I need to make chagnes to my Metadata so I went ahead and popped in:
<attr path="/api/package[#name='MyPackage']/class[#name='r']" name="obfuscated">false</attr>
Which resulted in the R being generated but now I get the 5 following compile error:
Error CS0535: 'R' does not implement interface member 'IMap.EntrySet()' (CS0535)
Error CS0738: 'R' does not implement interface member 'IMap.KeySet()'. 'R.KeySet()' cannot implement 'IMap.KeySet()' because it does not have the matching return type of 'ICollection'. (CS0738)
Error CS0535: 'R' does not implement interface member 'IMap.Put(Object?, Object?)' (CS0535)
Error CS0535: 'R' does not implement interface member 'IMap.PutAll(IDictionary?)' (CS0535)
Error CS0738: 'R' does not implement interface member 'IMap.Values()'. 'R.Values()' cannot implement 'IMap.Values()' because it does not have the matching return type of 'ICollection'. (CS0738)
I tried to make a managed return using
<attr path="/api/package[#name='MyPackage']/class[#name='r']/method[#name='entrySet' and count(parameter)=0]" name="managedReturn">Java.Util.IMap</attr>
With same number of compile error as above. Then I tried removing the node using:
<remove-node path="/api/package[#name='MyPackage']/class[#name='r']/method[#name='entrySet']"/>
Still no luck. :(
What am I missing here? Any pointers/suggestions will be appreciated!
It seems like you are trying to expose a Map to C# and as you stated, Java Generics are not handled very well.
In a very popular social network you received an answer from #mattleibow. I do not take credit for his answer but I went to check nonetheless and it seems fine.
If you look at the description of the Java.Lang.HashMap type
https://learn.microsoft.com/en-us/dotnet/api/java.util.hashmap?view=xamarin-android-sdk-9 it's a good candidate for you to expose.
You can also try with the corresponding interface for better safety https://learn.microsoft.com/en-us/dotnet/api/java.util.imap?view=xamarin-android-sdk-9
If it works you will still have to cast the types yourself.
Please answer to the comment to say that problem is solved for the sake of future generations arriving on this post :D
Credit is not mine so don't give it to me :-)
John,
I got arround fixing it by providing implementation of the the said methods in a partial class. Basically added a new file called R.cs under Additions folder as follows:
namespace YourNameSpace
{
public partial class R
{
public void PutAll(System.Collections.IDictionary p0)
{
PutAll(p0);
}
public Java.Lang.Object Put(Java.Lang.Object key, Java.Lang.Object value)
{
return Put(key, value);
}
public System.Collections.ICollection EntrySet()
{
return EntrySet();
}
public System.Collections.ICollection KeySet()
{
return KeySet();
}
public System.Collections.ICollection Values()
{
return Values();
}
}
}
I couldn't get it to work by adding XML transformation, but I think there was some tooling issue.
Hello i want to be able to set the a of a field of an object only in an extension method. I would want that this field to either be completelely private , or be just get-able from outside:
public class Myclass
{
private int Value{get;set;}
}
public static class Ext
{
public Myclass SetValue(this Myclass obj,int val)
{
this.obj.Value=val;
return obj;
}
}
As you can see in the above example , i have to declare Value public to be able to access it inside the extension , i would be ok with that if i could make the variable only get-ablefrom outside.
I need this functionality because i want to develop something like a fluent api , where you can only set some variables using the extension.
ex:
a=new Myclass();
a.SetValue1(1).SetValue2(2);//--some code //--a.SetValue3(3);
It sounds like you're using the wrong tool for the job, extension methods don't have access non-public members.
The behavior you want is restricted to instance methods or properties. My recommendation is to add an instance method to the class.
If that doesn't persuade you, then you can instead use reflection to update the private instance variable:
public static class Ext
{
public Myclass SetValue(this Myclass obj,int val)
{
var myType = typeof(Myclass);
var myField = myType.GetField("Value", BindingFlags.NonPublic | BindingFlags.Instance);
myField.SetValue(obj, val);
return obj;
}
}
Please note that this has the following gotchas:
There are no compile time checks to save you if you decide to rename the field Value. (though unit tests can protect you)
Reflection is typically much slower than regular instance methods. (though performance may not matter if this method isn't called frequently)
you want it to do it with extension method but you cannot in this case.
Your best option is
public class Myclass
{
public int Value{get; private set;}
public Myclass SetValue(int val)
{
this.Value=val;
return obj;
}
}
I've RESTful service Spring MVC based.
The service has a RESTful resource method that returns the following response:
public class OperationalDataResponse<T> {
private String status;
private String statusMessage;
private T result;
//getters and setters
}
This response object encapsulates the result object of type T.
On the client side I use RestTemplate with GsonHttpMessageConverter added.
I get the response from service as a ResponseEntity
I handle the generic response with runtime Type as below:
public class OperationalDataRestClient<REQ,RESULT_TYPE> {
public OperationalDataResponse<RESULT_TYPE> getOperationalData(String resourcePath, Map<String, Object> urlVariables, Class<RESULT_TYPE> resultType) {
//code to invoke service and get data goes here
String responseString = responseEntity.getBody();
response = GsonHelper.getInstance().fromJson(responseString, getType(OperationalDataResponse.class, resultType));
}
Type getType(final Class<?> rawClass, final Class<?> parameter) {
return new ParameterizedType() {
#Override
public Type[] getActualTypeArguments() {
return new Type[] { parameter };
}
#Override
public Type getRawType() {
return rawClass;
}
#Override
public Type getOwnerType() {
return null;
}
};
}
}
This works like a charm as long as my resultType is a non-collection class.
So, this works great from caller code:
getOperationalData(someResourcePath, someUrlVariables, MyNonGenericClass.class)
However if my resultType is a collection (say, List<String> or List<MyNonGenericClass>)
then I don't know how to pass the resultType Class from the caller code.
For example, from caller code,
getOperationalData(someResourcePath, someUrlVariables, List.class)
or
getOperationalData(someResourcePath, someUrlVariables, List<MyNonGenericClass>.class)
throws compilation error.
I tried passing on ArrayList.class as well but that too doesn't work.
Any suggestion how can I pass a generic collection as a resultType from caller code (in other words, as an example, how can I pass the class object of a List<String> or List<MyNonGenericClass> from caller code ?)
If you know that ResultType is coming as a List, Then it will obvious fail like you said compilation issue.Why? because you are trying to send a List when you method only accepts a single value.In order to over come that issue you will have to change the method arguments to the following
public OperationalDataResponse<RESULT_TYPE> getOperationalData(String resourcePath, Map<String, Object> urlVariables, List<Class<RESULT_TYPE>> resultType){
....
}
and you will have to make some slight modification to getType() Method,loop it and then pass each class value to getType method like so
for(MyNonGenericClass myClass:mylist){
getType(OperationalDataResponse.class, myClass.getClass());
}
I'm pretty new to MVVM light world, and after searches I can't find what I want to do.
My WP7 application contains a pivot, each pivot item content is View1 and viewmodel is VM1.
When loading my application, I'd like to create every pivot item with the same view and view model but with different parameter.
example :
PivotItem 1 -> send param "car" to the view model
PivotItem 2 -> send param "truck" to the view model, etc.
Google told me to use messaging but if I send 2 messages from my MainViewModel, both PivotItem1 and PivotItem2 ViewModel will receive these messages.
Am I wrong with this approach ?
Is there another solution to succeed ?
Thank you in advance for your answer.
PS : be indulgent, english is not my native language, don't hesitate to ask for further information.
Regards,
Aymeric Lagier
To seperate the messages use the second constructor signature whereby you can pass a token. This token can be anything but I generally use an enum to store all my message types within the system.
Create a static class in a common library and reference this in all projects where you need to send or receive messages.
The following code hopefully shows this approach, notice I am sending a string as a value within the message but this can be anything, even a complex object such as one of your business objects.
namespace MyProject.Common
{
public static class AppMessages
{
enum MessageTypes
{
ViewmodelA,
ViewmodelB
}
public static class ViewModelAUpdate
{
public static void Send(string value)
{
Messenger.Default.Send(value, MessageTypes.ViewmodelA);
}
public static void Register(object recipient, Action<string> action)
{
Messenger.Default.Register(recipient, MessageTypes.ViewmodelA, action);
}
}
public static class ViewModelBUpdate
{
public static void Send(string value)
{
Messenger.Default.Send(value, MessageTypes.ViewmodelB);
}
public static void Register(object recipient, Action<string> action)
{
Messenger.Default.Register(recipient, MessageTypes.ViewmodelB, action);
}
}
}
}
How about using a method to set the message you want to receive. (this could be done as a parameter in the constructor or a property as well)
public void RegisterForAppMessage(AppMessages.MessageTypes messageType)
{
switch (messageType)
{
case AppMessages.MessageTypes.PivotViewItem1Message:
AppMessages.PivotViewItem1Message.Register(this,DoSomethingWhenIRecievePivotViewItem1Messages)
break;
case AppMessages.MessageTypes.PivotViewItem2Message:
AppMessages.PivotViewItem2Message.Register(this,DoSomethingWhenIRecievePivotViewItem2Messages)
break;
}
}
private void DoSomethingWhenIRecievePivotViewItem2Messages(string obj)
{
// TODO: Implement this method
throw new NotImplementedException();
}
private void DoSomethingWhenIRecievePivotViewItem1Messages(string obj)
{
// TODO: Implement this method
throw new NotImplementedException();
}
Messaging sounds a bit heavy for this purpose. Could you simply inject a parameter into your ViewModel. If you already have MVVMLight you also have support for SimpleIOC. Maybe let the view locate its ViewModel when the view is resolved and there decide which parameter to use on the view model?
You can see an example of it here