【发布时间】：2016-10-25 21:24:54
【问题描述】：
我正在开发 Android 应用程序。我正在使用改造（使用 OkClient）来处理 api 请求，并使用 Robolectric 来进行测试。我的 api 是这样的：
@GET("/v1/book/{bookId}") Observable<Book> getBook(@Path("bookId") int bookId);
仅对于 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();
}
}
我有一个如下所示的简单测试：
API.getBook(1).subscribe();
API.getBook(2).subscribe();
Restadapter 是使用构建器创建的，API 对象也使用它创建 (restadapter.create(...))。因为它是微不足道的，所以我省略了它。
第一个工作没有问题，但第二个应该相同会引发异常：
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)
我有一个只有一个日志的网络拦截器，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，那么它可以工作。一切都按预期同步。
解决方案 经过多次尝试，我可以找到解决方案。问题似乎来自Okio。显然有一个缓冲区可以写入响应（或类似的东西，我几周前解决了它，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。
为了解决这个问题，我将请求包装在 try/catch 块中。如果发生 IOException，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; }
链对象来自一个 OkHttpClient 拦截器：
OkHttpClient 客户端 = 新 OkHttpClient(); client.interceptors().add(new CustomInterceptor());
私有类 CustomInterceptor 实现 Interceptor { @Override 公共响应拦截（链链）抛出 IOException { ...
希望这有帮助。
【问题讨论】：
-
你的测试只需两分钱 - 为什么不测试没有真正的网络？
标签： android testing retrofit robolectric rx-java