android - Robolectric + rxJava + 改造 第二次调用抛出 java.io.InterruptedIOException

Question

我正在开发 Android 应用程序。我正在使用改造(使用 OkClient)进行 api 请求和 Robolectric 进行测试。我的 api 看起来像这样:

@GET("/v1/book/{bookId}") Observable<Book> getBook(@Path("bookId") int bookId);

只是为了 Robolectric，我强制 api 调用是同步的。 restAdapter 构建器如下所示:

RestAdapter.Builder builder = new RestAdapter.Builder().setEndpoint(environment.getServerEndpoint())
                        .setClient(new OkClient(client))
                        .setExecutors(new ImmediateExecutor(), null)
                        .setErrorHandler(new ErrorHandler())
                        .setRequestInterceptor(new RequestInterceptor() {
                            @Override
                            public void intercept(RequestFacade request) {
                                // Always ask for JSON data
                                request.addHeader("Accept", "application/json");
                                request.addHeader("Content-Type", "application/json");               
                            }
                        });

public class ImmediateExecutor implements Executor {

        @Override public void execute(Runnable command) {
            command.run();
        }
    }

我有一个看起来像这样的简单测试:

API.getBook(1).subscribe();
API.getBook(2).subscribe();

Restadapter 是用构建器创建的，API 对象也是用它创建的 (restadapter.create(...))。我省略了它，因为它微不足道。

第一个没有问题，但是第二个应该是一样的会抛出异常:

java.io.InterruptedIOException
    at okio.Timeout.throwIfReached(Timeout.java:146)
    at okio.Okio$1.write(Okio.java:75)
    at okio.AsyncTimeout$1.write(AsyncTimeout.java:155)
    at okio.RealBufferedSink.flush(RealBufferedSink.java:201)
    at com.squareup.okhttp.internal.http.HttpConnection.flush(HttpConnection.java:140)
    at com.squareup.okhttp.internal.http.HttpTransport.finishRequest(HttpTransport.java:52)
    at com.squareup.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:828)
    at com.squareup.okhttp.internal.http.HttpEngine.access$200(HttpEngine.java:95)
    at com.squareup.okhttp.internal.http.HttpEngine$NetworkInterceptorChain.proceed(HttpEngine.java:823)
    at com.carmacarpool.carmaridepool.rest.CarmaHttpClientFactory$NetworkLoggingInterceptor.intercept(CarmaHttpClientFactory.java:77)
    at com.squareup.okhttp.internal.http.HttpEngine$NetworkInterceptorChain.proceed(HttpEngine.java:803)
    at com.squareup.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:684)
    at com.squareup.okhttp.Call.getResponse(Call.java:272)
    at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:228)
    at com.carmacarpool.carmaridepool.rest.CarmaHttpClientFactory$LoggingInterceptor.intercept(CarmaHttpClientFactory.java:53)
    at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:225)
    at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:199)
    at com.squareup.okhttp.Call.execute(Call.java:79)
    at retrofit.client.OkClient.execute(OkClient.java:53)
    at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:326)
    at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
    at retrofit.RestAdapter$RestHandler$1.invoke(RestAdapter.java:265)
    at retrofit.RxSupport$2.run(RxSupport.java:55)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at com.carmacarpool.carmaridepool.testutils.ShadowUICarmaRESTClassFactory$ImmediateExecutor.execute(ShadowUICarmaRESTClassFactory.java:91)
    at retrofit.RxSupport$1.call(RxSupport.java:42)
    at retrofit.RxSupport$1.call(RxSupport.java:32)
    at rx.Observable.subscribe(Observable.java:7393)
    at rx.Observable.subscribe(Observable.java:7083)
    at com.carmacarpool.carmaridepool.CorridorTest.test(CorridorTest.java:99)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
    at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:265)
    at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:205)
    at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:54)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:173)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:86)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:49)
    at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:64)
    at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:50)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
    at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
    at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
    at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:106)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
    at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
    at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:360)
    at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:64)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

我有一个网络拦截器，只有一个日志，它工作正常。我可以访问服务器日志，但请求甚至没有到达服务器。

有人知道可能是什么问题吗？似乎由于某种未知原因线程被杀死了？

谢谢。

编辑:如果在 onNext 函数(订阅的第一个参数)中，我执行第二个请求，那么它会起作用。正如预期的那样，一切都是同步的。

解决方案经过多次尝试，我找到了解决方案。问题似乎来自 Okio。显然有一个写入响应的缓冲区(或类似的东西，我几周前解决了它，但我不记得 100%)。此缓冲区在第二个请求的中间关闭，这就是导致错误的原因。

要解决此问题，我所做的是将请求包装在 try/catch block 中。如果发生 IOException，那么我会重试。我最多重试 5 次(以避免无限循环)。

代码如下:

    try {
        // Perform the request
        return chain.proceed(request);
    } catch (IOException e) {

        // Retry again if we haven't tried at least REQUEST_RETRIES times
        if (iteration < REQUEST_RETRIES) {
            return performRequest(chain, ++iteration);
        }

        // Otherwise, save the exception and throw it later
        exception = e;
    }

链对象来自 OkHttpClient 拦截器:

OkHttpClient client = new OkHttpClient(); client.interceptors().add(new CustomInterceptor());

private class CustomInterceptor implements Interceptor { @Override public Response intercept(Chain chain) throws IOException { ...

希望对您有所帮助。

Answer 1

我认为您在让可观察对象在测试期间同步运行方面做得有点过头了。相反，您需要做的就是在测试期间

 Book book = retrofitAPI.getBook(someId).toBlocking.first()

这将同步执行可观察对象。 Rx 库中我最喜欢的部分之一。