My scenario is,
Server and client initiated
server sends message to client ,(server initiating the message exchange)
client receives the message and reply back with the response
If so, Please help me with grpc-java sample code.
All I could find is client sending the message to the server, for that server sends back the response.
Server sending message first can be achieved by Bidirectional-streaming
https://grpc.io/docs/reference/java/generated-code.html
// Client Side:
volatile StreamObserver<Message> requestOb;
StreamObserver<Message> responseOb = new StreamObserver<>() {
#Override public void onNext(Message msg) { requestOb.onNext(msg); }
#Override public void onError(Throwable t) { requestOb.onError(t); }
#Override public void onCompleted() { requestOb.onCompleted(); }
}
requestOb = stub.echoTheServer(responseOb);
// Server side:
#Override
public StreamObserver<Message> echoTheServer(StreamObserver<Message> responseOb) {
for (int i = 0; i < 100; i++) {
responseOb.onNext(new Message());
}
responseOb.onComplete();
return new StreamObserver<Message>() {
#Override public void onNext(Message msg) {}
#Override public void onError(Throwable t) { responseOb.onError(t); }
#Override public void onCompleted() {}
}
}
Related
If I send multiple commands to the same aggregate, only the first is handled.
Is this a configuration problem, or am I missing something?
The message I am getting after the 2nd command is send:
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.axonframework.commandhandling.CommandExecutionException: Cannot invoke "Object.hashCode()" because "key" is null
The service method where I do my sending of the command is:
public void maakAanvraag() {
UUID aanvraagId = UUID.randomUUID();
commandGateway.sendAndWait(
VerwerkAanvraag.builder()
.aanvraagId(aanvraagId)
.build()
);
commandGateway.sendAndWait(
VerwerkPersoonsgegevensVastgesteld.builder()
.aanvraagId(aanvraagId)
.build()
);
commandGateway.sendAndWait(
VerwerkOrganisatiegegevensVastgesteld.builder()
.aanvraagId(aanvraagId)
.organisatieId(organisatieView.getOrganisatieId())
.rolOrganisatie(rolOrganisatie)
.build()
);
commandGateway.sendAndWait(
VerwerkBeperkingErkenningsdoelGematcht.builder()
.aanvraagId(aanvraagId)
.build());
}
The aggregate I am using is:
#Aggregate
#Getter
#NoArgsConstructor
public class Aanvraag {
public static final String META_DATA_ZAAKNUMMER = "aanvraag_zaaknummer";
#AggregateIdentifier
private UUID aanvraagId;
#CommandHandler
public Aanvraag(VerwerkAanvraag command) {
AanvraagGeregistreerd aanvraagGeregistreerd =
AanvraagGeregistreerd.builder()
.aanvraagId(command.getAanvraagId())
.build();
apply(aanvraagGeregistreerd, MetaData.with(META_DATA_ZAAKNUMMER, "123456789"));
}
#EventSourcingHandler
public void on(AanvraagGeregistreerd event) {
aanvraagId = event.getAanvraagId();
}
#CommandHandler
public void verwerkOrganisatiegegevensVastgesteld(VerwerkOrganisatiegegevensVastgesteld command) {
OrganisatiegegevensVastgesteld persoonsgegevensVastgesteld =
OrganisatiegegevensVastgesteld.builder()
.aanvraagId(command.getAanvraagId())
.build();
apply(persoonsgegevensVastgesteld);
}
#EventSourcingHandler
public void on(OrganisatiegegevensVastgesteld event) {
aanvraagId = event.getAanvraagId();
}
#CommandHandler
public void verwerkPersoonsgegevensVastgesteld(VerwerkPersoonsgegevensVastgesteld command) {
PersoonsgegevensVastgesteld persoonsgegevensVastgesteld =
PersoonsgegevensVastgesteld.builder()
.aanvraagId(command.getAanvraagId())
.build();
apply(persoonsgegevensVastgesteld);
}
#EventSourcingHandler
public void on(PersoonsgegevensVastgesteld event) {
aanvraagId = event.getAanvraagId();
}
#CommandHandler
public void verwerkBeperkingErkenningsdoelGematcht(VerwerkBeperkingErkenningsdoelGematcht command) {
BeperkingErkenningsdoelGematcht beperkingErkenningsdoelGematcht =
BeperkingErkenningsdoelGematcht.builder()
.aanvraagId(command.getAanvraagId())
.build();
apply(beperkingErkenningsdoelGematcht);
}
#EventSourcingHandler
public void on(BeperkingErkenningsdoelGematcht event) {
aanvraagId = event.getAanvraagId();
}
}
The project uses Spring Boot 2.6.6 with axon-spring-boot-starter 4.5.9
It al runs with Java Temurin 17.0.3
We solved the problem.
Issue had nothing to do with Axon.
The problem was an Logging interceptor.
After removing this log interceptor the Axon worked as expected.
I'm wreting a SpringBoot web service use websocket to send message to client and using JPA to save data.
in project I use a thread to create a data ,and then use JPA to save it ,use Websocket to show data. But it doesn't work with a NullPointExecption.
this is my code:
#RestController
#ServerEndpoint("/websocket")
public class CrawlingController {
private final Logger logger = LoggerFactory.getLogger(CrawlingController.class);
#Autowired
private SimulateDataRepository simulateDataRepository;
private static GlobalStatus globalStatus = GlobalStatus.getInstance();
private Session session;
private static CopyOnWriteArraySet<CrawlingController> crawlingControllers =
new CopyOnWriteArraySet<>();
#OnOpen
public void onOpen(Session session) throws Exception {
this.session = session;
crawlingControllers.add(this);
String message = dataCrawling();
}
#OnMessage
public void onMessage(String message, Session session) throws IOException {
for (CrawlingController controller : crawlingControllers)
sendMessage(message);
}
#OnClose
public void onClose() {
crawlingControllers.remove(this);
if (crawlingControllers.size() == 0)
end();
session=null;
end();
}
private void sendMessage(String message) throws IOException {
this.session.getBasicRemote().sendText(message);
}
public void onError(Session session, Throwable error) {
logger.error(error.getMessage());
System.out.println("websocket found something error!");
}
#RequestMapping("/start")
public String dataCrawling() throws Exception {
if (!globalStatus.isDataCrawling) {
Process process = null;
synchronized (globalStatus) {
process = Utils.crawling();
globalStatus.crawlingProcss = process;
globalStatus.isDataCrawling = true;
}
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
new Thread(() -> {
try {
stuffSimulate(bufferedReader);
} catch (IOException | ParseException e) {
logger.error(e.getMessage());
}
}).start();
return "start Finish!";
} else return "faild";
}
public void stuffSimulate(BufferedReader reader) throws IOException, ParseException {
line = reader.readLine();
while (globalStatus.isDataCrawling) {
SimulateData simulateData = new SimulateData();
.... ...
simulateData.setData(data.toString());
this.saveAndShow(simulateData);
}
}
}
}
private void saveAndShow(SimulateData simulateData) throws IOException {
simulateData = simulateDataRepository.saveAndFlush(simulateData);
SummaryData summaryData = SimulateService.obtainSummary(simulateData);
onMessage(summaryData.printSummary(),this.session);
summaryData.sout();
}
}
simulateDataRepository can be work when i use http://localhost:8080/start.
the mysql can get data.
But it cna't be work when i use websocket!!!
The error meaasge said that:
Exception in thread "Thread-5" java.lang.NullPointerException
at cn.linhos.controller.CrawlingController.saveAndShow(CrawlingController.java:293)
at cn.linhos.controller.CrawlingController.stuffSimulate(CrawlingController.java:172)
at cn.linhos.controller.CrawlingController.lambda$dataCrawling$0(CrawlingController.java:104)
at java.lang.Thread.run(Thread.java:748)
why simulateDataRepository can't saveAndFlush when websocket but can do it when i use "/start"?
how should i do to make websocket work ?
I'm using meteor ddp (Distributed Data Protocol) to my application. Server code is written using meteor and Android client using java.
Server code
if (Meteor.isServer) {
Users = new Mongo.Collection('testUsers');
Meteor.publish('methodToListen', function(){
return Users.find();
});
}
Client code (https://github.com/delight-im/Android-DDP)
public class MainActivity extends AppCompatActivity implements MeteorCallback {
private Meteor mMeteor;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Meteor.setLoggingEnabled(true);
mMeteor = new Meteor(this, "ws://192.168.137.1:3000/websocket");
mMeteor.addCallback(this);
mMeteor.connect();
}
#Override
public void onConnect(boolean signedInAutomatically) {
String subscriptionId = mMeteor.subscribe("methodToListen");
}
#Override
public void onDisconnect() {
}
#Override
public void onException(Exception e) {
}
#Override
public void onDataAdded(String collectionName, String documentID, String newValuesJson) {
Log.d("DATACHANGED", "Add " + collectionName + ", " + documentID + ", " + newValuesJson);
}
#Override
public void onDataChanged(String collectionName, String documentID, String updatedValuesJson, String removedValuesJson) {
}
#Override
public void onDataRemoved(String collectionName, String documentID) {
}
}
So now every client that connects to server see live database updates. Is it possible to send updates only for specific client? So for example when user sign in to system it gets unique id and based on that id is it possible to send updated data?
Updated I can get information about connected clients
Meteor.onConnection(function(connection) {
console.log(connection.id + ", " + connection.clientAddress);
});
So for example ip addresses could be id
UPDATE:
I have learned what I am looking to do is to use the Async within Retrofit with multiple queries too. I have updated my code, but I cannot get the async with the queries.
I am using Retrofit to make my data calls to a movie database and need to change the sort order depending on user settings. I am not clear how I could add this functionality to my interface.
sort_by=highest_rating.desc
or
sort_by=popularity.desc
Interface:
public interface MovieDatabaseApiCient {
#GET("/3/discover/movie")
void getData(#Query("api_key") String apiKey, #Query("sort_by") String sortByValue, Callback<MovieDbModel> response);
}
UPDATED API INTERFACE:
public interface MovieDatabaseApiCient {
#GET("/3/discover/movie?sort_by=popularity.desc&api_key=xxxxxxx")
void getMoviesByPopularityDesc(Callback<MovieDbModel> response);
#GET("/3/discover/movie?sort_by=vote_average_desc&api_key=xxxxxxxx")
void getMoviesByVotingDesc(Callback<MovieDbModel> response);
}
UPDATED DATA CALL THAT WORKS:
private void makeDataCall(String sortPreference) {
final RestAdapter restadapter = new RestAdapter.Builder().setEndpoint(ENDPOINT_URL).build();
MovieDatabaseApiCient apiLocation = restadapter.create(MovieDatabaseApiCient.class);
if (sortPreference.equals(this.getString(R.string.sort_order_popularity)) ){
apiLocation.getMoviesByPopularityDesc (new Callback<MovieDbModel>() {
#Override
public void success(MovieDbModel movieModels, Response response) {
movieDbResultsList = movieModels.getResults();
MoviesGridViewAdapter adapter = new MoviesGridViewAdapter(getApplicationContext(), R.layout.movie_gridview_item, movieDbResultsList);
gridView.setAdapter(adapter);
}
#Override
public void failure(RetrofitError error) {
Log.d("ERROR", error.toString());
Toast.makeText(getApplicationContext(), "Error: " + error.toString(), Toast.LENGTH_SHORT).show();
}
});
} else {
apiLocation.getMoviesByVotingDesc( new Callback<MovieDbModel>() {
#Override
public void success(MovieDbModel movieModels, Response response) {
movieDbResultsList = movieModels.getResults();
MoviesGridViewAdapter adapter = new MoviesGridViewAdapter(getApplicationContext(), R.layout.movie_gridview_item, movieDbResultsList);
gridView.setAdapter(adapter);
}
#Override
public void failure(RetrofitError error) {
Log.d("ERROR", error.toString());
Toast.makeText(getApplicationContext(), "Error: " + error.toString(), Toast.LENGTH_SHORT).show();
}
});
}
}
My call for the data:
private void makeDataCall (String apiKey, String sortPreference) {
final RestAdapter restadapter = new RestAdapter.Builder().setEndpoint(ENDPOINT_URL).build();
MovieDatabaseApiCient apiLocation = restadapter.create(MovieDatabaseApiCient.class);
apiLocation.getData(apiKey, sortPreference, new Callback<MovieDbModel>){
#Override
public void success(MovieDbModel movieModels, Response response) {
movieDbResultsList = movieModels.getResults();
MoviesGridViewAdapter adapter = new MoviesGridViewAdapter(getApplicationContext(), R.layout.movie_gridview_item, movieDbResultsList);
gridView.setAdapter(adapter);
}
#Override
public void failure(RetrofitError error) {
Log.d("ERROR", error.toString());
Toast.makeText(getApplicationContext(), "Error: " + error.toString(), Toast.LENGTH_SHORT).show();
}
});
}
I found a way to do Synchronously, but not asynchronously.
From your question and comment, IHMO, you should import retrofit.Callback; instead of import com.squareup.okhttp.Callback;
My code as the following has no compile error:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// creating a RestAdapter using the custom client
RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(API_URL_BASE)
.setLogLevel(RestAdapter.LogLevel.FULL)
.setClient(new OkClient(mOkHttpClient))
.build();
WebService webService = restAdapter.create(WebService.class);
retrofit.Callback<GetRoleData> callback = new Callback<GetRoleData>() {
#Override
public void success(GetRoleData getRoleData, retrofit.client.Response response) {
}
#Override
public void failure(RetrofitError error) {
}
};
webService.getData("api_key", "sort_by", callback);
}
Interface:
public interface WebService {
#GET("/3/discover/movie")
void getData(#Query("api_key") String apiKey, #Query("sort_by") String sortByValue, Callback<GetRoleData> response);
}
So, please check your code again
I'm using Retrofit and RxJava but can't seem to do what I want.
Here's my declaration of my web service:
Observable<Response> rawRemoteDownload(#Header("Cookie") String token, #Path("programId") int programId);
The problem I have is the webservice is returning a 403 and a json payload with details.
Retrofit calls onError, only passing the Throwable so I can't check the response body.
Here's part of my test code
apiManager.rawRemoteDownloadRequest("token", 1).subscribe(new Observer<Response>() {
#Override
public void onCompleted() {
}
#Override
public void onError(Throwable e) {
// this is called and I've lost the response!
}
#Override
public void onNext(Response response) {
}
});
SOLUTION:
Thanks to Gomino, I went with this as a solution:
new Action1<Throwable>() {
#Override
public void call(Throwable throwable) {
if (throwable instanceof RetrofitError) {
Response response = ((RetrofitError) throwable).getResponse();
System.out.println(convertToString(response.getBody()));
}
}
where convertToString looks like:
private String convertToString(TypedInput body) {
byte[] bodyBytes = ((TypedByteArray) body).getBytes();
return new String(bodyBytes);
}
Check if the throwable is a RetrofitError:
#Override
public void onError(Throwable e) {
if (e instanceof RetrofitError) {
Response response = ((RetrofitError) e).getResponse();
}
}