Android RxJava-等待retryWhen完成,以查看其他活动/片段中的其他可观察对象
用例:我正在开发一个Android应用程序,它有一个带有4个选项卡的viewpager,所有这些选项卡都是片段。对于每个选项卡/片段,我必须每5分钟连接一个带有Oauth和令牌过期的RESTAPI 当前解决方案:使用RxJava和retryWhen操作符,当收到401 HTTP错误时,我可以重新进行身份验证。对于订阅和消费的每个可观察流,使用:Android RxJava-等待retryWhen完成,以查看其他活动/片段中的其他可观察对象,android,android-fragments,rx-java,reactive-programming,Android,Android Fragments,Rx Java,Reactive Programming,用例:我正在开发一个Android应用程序,它有一个带有4个选项卡的viewpager,所有这些选项卡都是片段。对于每个选项卡/片段,我必须每5分钟连接一个带有Oauth和令牌过期的RESTAPI 当前解决方案:使用RxJava和retryWhen操作符,当收到401 HTTP错误时,我可以重新进行身份验证。对于订阅和消费的每个可观察流,使用: retryWhen(refreshTokenAuthenticator) 因此,当令牌过期时,流将使用它,然后执行真正的api调用 问题:这只适用于一
retryWhen(refreshTokenAuthenticator)
因此,当令牌过期时,流将使用它,然后执行真正的api调用
问题:这只适用于一个订阅中消耗的一个可观察项,但我需要允许用户在选项卡之间切换,而不会阻止他/她,因为401错误可能随时出现在任何Api调用的任何片段中
问题:有没有办法让观察对象等待onNext()完成的其他观察对象,它们不在同一个流/订阅服务器中?事实上,在不同的片段?因此,api调用场景如下所示:
Api Call Fragment A --> request
Api Call Fragment A <-- response 200 Code
Api Call Fragment B --> request
Api Call Fragment B <-- response 401 Code (retryWhen in action)
Api Call Fragment B --> request (refreshToken)
Api Call Fragment B <-- response 200 (with new access token saved in the app)
Api调用片段C-->请求
Api调用片段C调用(可观察>(){
int retryCount=0;
@凌驾
公共可观察呼叫(最终可丢弃){
retryCount++;
if(retryCount sessionManager.saveAuthToken(tokenDto))
.doon错误(可丢弃1->{
Log.e(“RefreshTokenAuth”,“DoOnError”,throwable1);
application.logout();
});
}
}
//不再重试。请传递原始改装错误。
返回可观测误差(可丢弃);
}
});
}
}1)使身份验证令牌源缓存上次成功的结果+提供使此缓存结果无效的方法:
class Auth {
private Observable<AuthToken> validToken;
synchronized void invalidateAuthToken() {
validToken = null;
}
synchronized Observable<AuthToken> getAuthToken() {
if (validToken == null) {
validToken = repository
.refreshToken(...) // start async request
.doOnError(e -> invalidateAuthToken())
.replay(1); // cache result
}
return validToken; // share among all subscribers
}
}
类身份验证{
私人可观察有效性;
同步的void invalidateAuthToken()无效{
validToken=null;
}
同步可观测getAuthToken(){
if(validToken==null){
validToken=存储库
.refreshToken(…)//启动异步请求
.doError(e->invalidateAuthToken())
.replay(1);//缓存结果
}
return validToken;//在所有订阅者之间共享
}
}
2) 要访问web服务,请使用以下模式:
Observable<Data1> dataSource1 =
Observable.defer(auth.getAuthToken()) // always start from token
.flatMap(token ->
repository.fetchData1(token, ...)) // use token to call web service
.doOnError(e -> auth.invalidateAuthToken())
.retry(N); // retry N times
可观测数据源1=
Observable.defer(auth.getAuthToken())//始终从标记开始
.flatMap(令牌->
repository.fetchData1(token,…)//使用token调用web服务
.doError(e->auth.invalidateAuthToken())
.重试(N);//重试N次
如果应用程序当前是否正在重新验证,只需添加一个全局(在我的应用程序类中)布尔值,就可以让它工作。它实际上允许两个401HTTP错误,但第二个错误在onNext()中继续,并重新执行初始可观察的。我想做一些反应性更强的事情,但至少这解决了我的主要问题
public class RefreshTokenAuthenticator implements Func1<Observable<? extends Throwable>, Observable<?>> {
private static final int RETRY_COUNT = 1;
private static final int HTTP_ERROR_CODE = 401;
@Inject
private UserRepository repository;
@Inject
private SessionManager sessionManager;
@Inject
private MyApplication application;
@Inject
private RefreshTokenAuthenticator() {
}
@Override
public Observable<?> call(Observable<? extends Throwable> observable) {
return observable
.flatMap(new Func1<Throwable, Observable<?>>() {
int retryCount = 0;
@Override
public Observable<?> call(final Throwable throwable) {
retryCount++;
if (retryCount <= RETRY_COUNT && throwable instanceof HttpException) {
int errorCode = ((HttpException) throwable).code();
if (errorCode == HTTP_ERROR_CODE) {
Log.i("RefreshTokenAuth", "APPLICATION IS AUTHENTICATING = " + application.isAuthenticating);
if (!application.isAuthenticating) {
application.isAuthenticating = true;
String refreshToken = sessionManager.getAuthToken().getRefreshToken();
return repository
.refreshToken(refreshToken)
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.doOnCompleted(() -> application.isAuthenticating = false)
.doOnNext(tokenDto -> sessionManager.saveAuthToken(tokenDto))
.doOnError(throwable1 -> {
Log.e("RefreshTokenAuth", "DoOnError", throwable1);
application.logout();
});
} else {
return Observable.just(1).doOnNext(o -> Log.i("RefreshTokenAuth", "Let's try another shot!"));
}
}
}
// No more retries. Pass the original Retrofit error through.
return Observable.error(throwable);
}
});
}
公共类RefreshTokenAuthenticator实现Func1>{
私有静态最终整数重试计数=1;
私有静态final int HTTP_ERROR_CODE=401;
@注入
私有用户存储库;
@注入
私有会话管理器会话管理器;
@注入
私人MyApplication;
@注入
私有刷新令牌身份验证器(){
}
@凌驾
公共可观察呼叫(可观察>(){
int retryCount=0;
@凌驾
公共可观察呼叫(最终可丢弃){
retryCount++;
if(retryCount application.IsAuthentication=false)
.doOnNext(tokenDto->sessionManager.saveAuthToken(tokenDto))
.doon错误(可丢弃1->{
Log.e(“RefreshTokenAuth”,“DoOnError”,throwable1);
application.logout();
});
}否则{
返回Observable.just(1).doOnNext(o->Log.i(“RefreshTokenAuth”,“让我们再试一次吧!”);
}
}
}
//不再重试。请传递原始改装错误。
返回可观测误差(可丢弃);
}
});
}
}我正在使用and拦截器和改型2截取请求,并在头上附加令牌。你认为你的答案(以Rx方式使用authtoken)更好还是至少更容易处理?@NicolasJafelle我的例子是通用的。您可以实现
fetchData1
函数,以便它以改进的方式注入令牌。
public void getDashboardDetail() {
Subscription subscription = repository.getDashboard()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.retryWhen(tokenAuthenticator)
.subscribe(new RestHttpObserver<UserDataDto>() {
@Override
public void onUnknownError(Throwable e) {
getMvpView().onError(e);
}
@Override
public void onHostUnreachable() {
getMvpView().onHostUnreachable();
}
@Override
public void onHttpErrorCode(int errorCode, ErrorDto errorDto) {
getMvpView().onHttpErrorCode(errorCode, errorDto);
}
@Override
public void onCompleted() {
//Do nothing...
}
@Override
public void onNext(UserDataDto response) {
getMvpView().onReceiveUserData(response);
}
});
this.compositeSubscription.add(subscription);
}
public class RefreshTokenAuthenticator implements Func1<Observable<? extends Throwable>, Observable<?>> {
private static final int RETRY_COUNT = 1;
private static final int HTTP_ERROR_CODE = 401;
@Inject
private UserRepository repository;
@Inject
private SessionManager sessionManager;
@Inject
private MyApplication application;
@Inject
private RefreshTokenAuthenticator() {
}
@Override
public synchronized Observable<?> call(Observable<? extends Throwable> observable) {
return observable
.flatMap(new Func1<Throwable, Observable<?>>() {
int retryCount = 0;
@Override
public Observable<?> call(final Throwable throwable) {
retryCount++;
if (retryCount <= RETRY_COUNT && throwable instanceof HttpException) {
int errorCode = ((HttpException) throwable).code();
if (errorCode == HTTP_ERROR_CODE) {
return repository
.refreshToken(sessionManager.getAuthToken().getRefreshToken())
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.doOnNext(tokenDto -> sessionManager.saveAuthToken(tokenDto))
.doOnError(throwable1 -> {
Log.e("RefreshTokenAuth", "DoOnError", throwable1);
application.logout();
});
}
}
// No more retries. Pass the original Retrofit error through.
return Observable.error(throwable);
}
});
}
class Auth {
private Observable<AuthToken> validToken;
synchronized void invalidateAuthToken() {
validToken = null;
}
synchronized Observable<AuthToken> getAuthToken() {
if (validToken == null) {
validToken = repository
.refreshToken(...) // start async request
.doOnError(e -> invalidateAuthToken())
.replay(1); // cache result
}
return validToken; // share among all subscribers
}
}
Observable<Data1> dataSource1 =
Observable.defer(auth.getAuthToken()) // always start from token
.flatMap(token ->
repository.fetchData1(token, ...)) // use token to call web service
.doOnError(e -> auth.invalidateAuthToken())
.retry(N); // retry N times
public class RefreshTokenAuthenticator implements Func1<Observable<? extends Throwable>, Observable<?>> {
private static final int RETRY_COUNT = 1;
private static final int HTTP_ERROR_CODE = 401;
@Inject
private UserRepository repository;
@Inject
private SessionManager sessionManager;
@Inject
private MyApplication application;
@Inject
private RefreshTokenAuthenticator() {
}
@Override
public Observable<?> call(Observable<? extends Throwable> observable) {
return observable
.flatMap(new Func1<Throwable, Observable<?>>() {
int retryCount = 0;
@Override
public Observable<?> call(final Throwable throwable) {
retryCount++;
if (retryCount <= RETRY_COUNT && throwable instanceof HttpException) {
int errorCode = ((HttpException) throwable).code();
if (errorCode == HTTP_ERROR_CODE) {
Log.i("RefreshTokenAuth", "APPLICATION IS AUTHENTICATING = " + application.isAuthenticating);
if (!application.isAuthenticating) {
application.isAuthenticating = true;
String refreshToken = sessionManager.getAuthToken().getRefreshToken();
return repository
.refreshToken(refreshToken)
.observeOn(AndroidSchedulers.mainThread())
.subscribeOn(Schedulers.io())
.doOnCompleted(() -> application.isAuthenticating = false)
.doOnNext(tokenDto -> sessionManager.saveAuthToken(tokenDto))
.doOnError(throwable1 -> {
Log.e("RefreshTokenAuth", "DoOnError", throwable1);
application.logout();
});
} else {
return Observable.just(1).doOnNext(o -> Log.i("RefreshTokenAuth", "Let's try another shot!"));
}
}
}
// No more retries. Pass the original Retrofit error through.
return Observable.error(throwable);
}
});
}