| // Copyright 2020 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.worker; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import com.google.devtools.build.lib.worker.WorkRequestHandler.RequestInfo; |
| import com.google.devtools.build.lib.worker.WorkRequestHandler.WorkRequestCallback; |
| import com.google.devtools.build.lib.worker.WorkRequestHandler.WorkRequestHandlerBuilder; |
| import com.google.devtools.build.lib.worker.WorkRequestHandler.WorkerMessageProcessor; |
| import com.google.devtools.build.lib.worker.WorkerProtocol.WorkRequest; |
| import com.google.devtools.build.lib.worker.WorkerProtocol.WorkResponse; |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InterruptedIOException; |
| import java.io.PipedInputStream; |
| import java.io.PipedOutputStream; |
| import java.io.PrintStream; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.concurrent.Semaphore; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.JUnit4; |
| import org.mockito.MockitoAnnotations; |
| |
| /** Tests for the WorkRequestHandler */ |
| @RunWith(JUnit4.class) |
| public class WorkRequestHandlerTest { |
| |
| private final WorkRequestHandler.WorkerIO testWorkerIO = createTestWorkerIO(); |
| |
| @Before |
| public void init() { |
| MockitoAnnotations.initMocks(this); |
| } |
| |
| @After |
| public void after() throws Exception { |
| testWorkerIO.close(); |
| } |
| |
| @Test |
| public void testNormalWorkRequest() throws IOException { |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| WorkRequestHandler handler = |
| new WorkRequestHandler( |
| (args, err) -> 1, |
| new PrintStream(new ByteArrayOutputStream()), |
| new ProtoWorkerMessageProcessor(new ByteArrayInputStream(new byte[0]), out)); |
| |
| List<String> args = Arrays.asList("--sources", "A.java"); |
| WorkRequest request = WorkRequest.newBuilder().addAllArguments(args).build(); |
| handler.respondToRequest(testWorkerIO, request, new RequestInfo(null)); |
| |
| WorkResponse response = |
| WorkResponse.parseDelimitedFrom(new ByteArrayInputStream(out.toByteArray())); |
| assertThat(response.getRequestId()).isEqualTo(0); |
| assertThat(response.getExitCode()).isEqualTo(1); |
| assertThat(response.getOutput()).isEmpty(); |
| } |
| |
| @Test |
| public void testMultiplexWorkRequest() throws IOException { |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| WorkRequestHandler handler = |
| new WorkRequestHandler( |
| (args, err) -> 0, |
| new PrintStream(new ByteArrayOutputStream()), |
| new ProtoWorkerMessageProcessor(new ByteArrayInputStream(new byte[0]), out)); |
| |
| List<String> args = Arrays.asList("--sources", "A.java"); |
| WorkRequest request = WorkRequest.newBuilder().addAllArguments(args).setRequestId(42).build(); |
| handler.respondToRequest(testWorkerIO, request, new RequestInfo(null)); |
| |
| WorkResponse response = |
| WorkResponse.parseDelimitedFrom(new ByteArrayInputStream(out.toByteArray())); |
| assertThat(response.getRequestId()).isEqualTo(42); |
| assertThat(response.getExitCode()).isEqualTo(0); |
| assertThat(response.getOutput()).isEmpty(); |
| } |
| |
| @Test |
| public void testMultiplexWorkRequest_stopsThreadsOnShutdown() |
| throws IOException, InterruptedException { |
| PipedOutputStream src = new PipedOutputStream(); |
| PipedInputStream dest = new PipedInputStream(); |
| |
| // Work request threads release this when they have started. |
| Semaphore started = new Semaphore(0); |
| // Work request threads wait forever on this, so we can see how they react to closed stdin. |
| Semaphore eternity = new Semaphore(0); |
| // Released when the work request handler thread has noticed the closed stdin and interrupted |
| // the work request threads. |
| Semaphore stopped = new Semaphore(0); |
| List<Thread> workerThreads = new ArrayList<>(); |
| StoppableWorkerMessageProcessor messageProcessor = |
| new StoppableWorkerMessageProcessor( |
| new ProtoWorkerMessageProcessor( |
| new PipedInputStream(src), new PipedOutputStream(dest))); |
| WorkRequestHandler handler = |
| new WorkRequestHandler( |
| (args, err) -> { |
| // Each call to this runs in its own thread. |
| try { |
| synchronized (workerThreads) { |
| workerThreads.add(Thread.currentThread()); |
| } |
| started.release(); |
| eternity.acquire(); // This blocks forever. |
| } catch (InterruptedException e) { |
| throw new AssertionError("Unhandled exception", e); |
| } |
| return 0; |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| messageProcessor); |
| |
| List<String> args = Arrays.asList("--sources", "A.java"); |
| Thread t = |
| new Thread( |
| () -> { |
| try { |
| handler.processRequests(); |
| stopped.release(); |
| } catch (IOException e) { |
| throw new AssertionError("Unhandled exception", e); |
| } |
| }); |
| t.start(); |
| WorkRequest request1 = WorkRequest.newBuilder().addAllArguments(args).setRequestId(42).build(); |
| request1.writeDelimitedTo(src); |
| WorkRequest request2 = WorkRequest.newBuilder().addAllArguments(args).setRequestId(43).build(); |
| request2.writeDelimitedTo(src); |
| src.flush(); |
| |
| started.acquire(2); |
| assertThat(workerThreads).hasSize(2); |
| // Now both request threads are started, closing the input to the "worker" should shut it down. |
| src.close(); |
| stopped.acquire(); |
| while (workerThreads.get(0).isAlive() || workerThreads.get(1).isAlive()) { |
| Thread.sleep(1); |
| } |
| assertThat(workerThreads.get(0).isAlive()).isFalse(); |
| assertThat(workerThreads.get(1).isAlive()).isFalse(); |
| } |
| |
| @Test |
| public void testMultiplexWorkRequest_stopsWorkerOnException() |
| throws IOException, InterruptedException { |
| PipedOutputStream src = new PipedOutputStream(); |
| PipedInputStream dest = new PipedInputStream(); |
| |
| // Work request threads release this when they have started. |
| Semaphore started = new Semaphore(0); |
| // One work request threads waits forever on this, so the second one can throw an exception |
| Semaphore eternity = new Semaphore(0); |
| // Released when the work request handler thread has been stopped after a worker thread died. |
| Semaphore stopped = new Semaphore(0); |
| List<Thread> workerThreads = new ArrayList<>(); |
| StoppableWorkerMessageProcessor messageProcessor = |
| new StoppableWorkerMessageProcessor( |
| new ProtoWorkerMessageProcessor( |
| new PipedInputStream(src), new PipedOutputStream(dest))); |
| WorkRequestHandler handler = |
| new WorkRequestHandler( |
| (args, err) -> { |
| // Each call to this runs in its own thread. |
| try { |
| synchronized (workerThreads) { |
| workerThreads.add(Thread.currentThread()); |
| } |
| started.release(); |
| if (workerThreads.size() < 2) { |
| eternity.acquire(); // This blocks forever. |
| } else { |
| throw new Error("Intentional death!"); |
| } |
| } catch (InterruptedException e) { |
| throw new AssertionError("Unhandled exception", e); |
| } |
| return 0; |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| messageProcessor); |
| |
| List<String> args = Arrays.asList("--sources", "A.java"); |
| Thread t = |
| new Thread( |
| () -> { |
| try { |
| handler.processRequests(); |
| stopped.release(); |
| } catch (IOException e) { |
| throw new AssertionError("Unhandled exception", e); |
| } |
| }); |
| t.start(); |
| WorkRequest request1 = WorkRequest.newBuilder().addAllArguments(args).setRequestId(42).build(); |
| request1.writeDelimitedTo(src); |
| WorkRequest request2 = WorkRequest.newBuilder().addAllArguments(args).setRequestId(43).build(); |
| request2.writeDelimitedTo(src); |
| src.flush(); |
| |
| started.acquire(2); |
| assertThat(workerThreads).hasSize(2); |
| stopped.acquire(); |
| while (workerThreads.get(0).isAlive() || workerThreads.get(1).isAlive()) { |
| Thread.sleep(1); |
| } |
| assertThat(workerThreads.get(0).isAlive()).isFalse(); |
| assertThat(workerThreads.get(1).isAlive()).isFalse(); |
| } |
| |
| @Test |
| public void testOutput() throws IOException { |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| WorkRequestHandler handler = |
| new WorkRequestHandler( |
| (args, err) -> { |
| err.println("Failed!"); |
| return 1; |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| new ProtoWorkerMessageProcessor(new ByteArrayInputStream(new byte[0]), out)); |
| |
| List<String> args = Arrays.asList("--sources", "A.java"); |
| WorkRequest request = WorkRequest.newBuilder().addAllArguments(args).build(); |
| handler.respondToRequest(testWorkerIO, request, new RequestInfo(null)); |
| |
| WorkResponse response = |
| WorkResponse.parseDelimitedFrom(new ByteArrayInputStream(out.toByteArray())); |
| assertThat(response.getRequestId()).isEqualTo(0); |
| assertThat(response.getExitCode()).isEqualTo(1); |
| assertThat(response.getOutput()).contains("Failed!"); |
| } |
| |
| @Test |
| public void testException() throws IOException { |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| WorkRequestHandler handler = |
| new WorkRequestHandler( |
| (args, err) -> { |
| throw new RuntimeException("Exploded!"); |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| new ProtoWorkerMessageProcessor(new ByteArrayInputStream(new byte[0]), out)); |
| |
| List<String> args = Arrays.asList("--sources", "A.java"); |
| WorkRequest request = WorkRequest.newBuilder().addAllArguments(args).build(); |
| handler.respondToRequest(testWorkerIO, request, new RequestInfo(null)); |
| |
| WorkResponse response = |
| WorkResponse.parseDelimitedFrom(new ByteArrayInputStream(out.toByteArray())); |
| assertThat(response.getRequestId()).isEqualTo(0); |
| assertThat(response.getExitCode()).isEqualTo(1); |
| assertThat(response.getOutput()).startsWith("java.lang.RuntimeException: Exploded!"); |
| } |
| |
| @Test |
| public void testCancelRequest_exactlyOneResponseSent() throws IOException, InterruptedException { |
| boolean[] handlerCalled = new boolean[] {false}; |
| boolean[] cancelCalled = new boolean[] {false}; |
| PipedOutputStream src = new PipedOutputStream(); |
| PipedInputStream dest = new PipedInputStream(); |
| Semaphore done = new Semaphore(0); |
| Semaphore finish = new Semaphore(0); |
| List<String> failures = new ArrayList<>(); |
| |
| StoppableWorkerMessageProcessor messageProcessor = |
| new StoppableWorkerMessageProcessor( |
| new ProtoWorkerMessageProcessor( |
| new PipedInputStream(src), new PipedOutputStream(dest))); |
| WorkRequestHandler handler = |
| new WorkRequestHandlerBuilder( |
| (args, err) -> { |
| handlerCalled[0] = true; |
| err.println("Such work! Much progress! Wow!"); |
| return 1; |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| messageProcessor) |
| .setCancelCallback( |
| (i, t) -> { |
| cancelCalled[0] = true; |
| }) |
| .build(); |
| |
| runRequestHandlerThread(done, handler, finish, failures); |
| WorkRequest.newBuilder().setRequestId(42).build().writeDelimitedTo(src); |
| WorkRequest.newBuilder().setRequestId(42).setCancel(true).build().writeDelimitedTo(src); |
| WorkResponse response = WorkResponse.parseDelimitedFrom(dest); |
| messageProcessor.stop(); |
| done.acquire(); |
| |
| assertThat(handlerCalled[0] || cancelCalled[0]).isTrue(); |
| assertThat(response.getRequestId()).isEqualTo(42); |
| if (response.getWasCancelled()) { |
| assertThat(response.getOutput()).isEmpty(); |
| assertThat(response.getExitCode()).isEqualTo(0); |
| } else { |
| assertThat(response.getOutput()).isEqualTo("Such work! Much progress! Wow!\n"); |
| assertThat(response.getExitCode()).isEqualTo(1); |
| } |
| |
| // Checks that nothing more was sent. |
| assertThat(dest.available()).isEqualTo(0); |
| finish.release(); |
| |
| // Checks that there weren't other unexpected failures. |
| assertThat(failures).isEmpty(); |
| } |
| |
| @Test |
| public void testCancelRequest_sendsResponseWhenDone() throws IOException, InterruptedException { |
| Semaphore waitForCancel = new Semaphore(0); |
| Semaphore handlerCalled = new Semaphore(0); |
| Semaphore cancelCalled = new Semaphore(0); |
| PipedOutputStream src = new PipedOutputStream(); |
| PipedInputStream dest = new PipedInputStream(); |
| Semaphore done = new Semaphore(0); |
| Semaphore requestDone = new Semaphore(0); |
| Semaphore finish = new Semaphore(0); |
| List<String> failures = new ArrayList<>(); |
| |
| StoppableWorkerMessageProcessor messageProcessor = |
| new StoppableWorkerMessageProcessor( |
| new ProtoWorkerMessageProcessor( |
| new PipedInputStream(src), new PipedOutputStream(dest))); |
| // We force the regular handling to not finish until after we have read the cancel response, |
| // to avoid flakiness. |
| WorkRequestHandler handler = |
| new WorkRequestHandlerBuilder( |
| (args, err) -> { |
| // This handler waits until the main thread has sent a cancel request. |
| handlerCalled.release(2); |
| try { |
| waitForCancel.acquire(); |
| } catch (InterruptedException e) { |
| failures.add("Unexpected interrupt waiting for cancel request"); |
| e.printStackTrace(); |
| } |
| requestDone.release(); |
| return 0; |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| messageProcessor) |
| .setCancelCallback( |
| (i, t) -> { |
| cancelCalled.release(); |
| }) |
| .build(); |
| |
| runRequestHandlerThread(done, handler, finish, failures); |
| WorkRequest.newBuilder().setRequestId(42).build().writeDelimitedTo(src); |
| // Make sure the handler is called before sending the cancel request, or we might process |
| // the cancellation entirely before that. |
| handlerCalled.acquire(); |
| WorkRequest.newBuilder().setRequestId(42).setCancel(true).build().writeDelimitedTo(src); |
| cancelCalled.acquire(); |
| waitForCancel.release(); |
| // Give the other request a chance to process, so we can check that no other response is sent |
| requestDone.acquire(); |
| messageProcessor.stop(); |
| done.acquire(); |
| |
| WorkResponse response = WorkResponse.parseDelimitedFrom(dest); |
| assertThat(handlerCalled.availablePermits()).isEqualTo(1); // Released 2, one was acquired |
| assertThat(cancelCalled.availablePermits()).isEqualTo(0); |
| assertThat(response.getRequestId()).isEqualTo(42); |
| assertThat(response.getOutput()).isEmpty(); |
| assertThat(response.getWasCancelled()).isTrue(); |
| |
| // Checks that nothing more was sent. |
| assertThat(dest.available()).isEqualTo(0); |
| src.close(); |
| finish.release(); |
| |
| // Checks that there weren't other unexpected failures. |
| assertThat(failures).isEmpty(); |
| } |
| |
| @Test |
| public void testCancelRequest_noDoubleCancelResponse() throws IOException, InterruptedException { |
| Semaphore waitForCancel = new Semaphore(0); |
| Semaphore cancelCalled = new Semaphore(0); |
| PipedOutputStream src = new PipedOutputStream(); |
| PipedInputStream dest = new PipedInputStream(); |
| Semaphore done = new Semaphore(0); |
| Semaphore requestsDone = new Semaphore(0); |
| Semaphore finish = new Semaphore(0); |
| List<String> failures = new ArrayList<>(); |
| |
| // We force the regular handling to not finish until after we have read the cancel response, |
| // to avoid flakiness. |
| StoppableWorkerMessageProcessor messageProcessor = |
| new StoppableWorkerMessageProcessor( |
| new ProtoWorkerMessageProcessor( |
| new PipedInputStream(src), new PipedOutputStream(dest))); |
| WorkRequestHandler handler = |
| new WorkRequestHandlerBuilder( |
| (args, err) -> { |
| try { |
| waitForCancel.acquire(); |
| } catch (InterruptedException e) { |
| failures.add("Unexpected interrupt waiting for cancel request"); |
| e.printStackTrace(); |
| } |
| requestsDone.release(); |
| return 0; |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| messageProcessor) |
| .setCancelCallback( |
| (i, t) -> { |
| cancelCalled.release(); |
| }) |
| .build(); |
| |
| runRequestHandlerThread(done, handler, finish, failures); |
| WorkRequest.newBuilder().setRequestId(42).build().writeDelimitedTo(src); |
| WorkRequest.newBuilder().setRequestId(42).setCancel(true).build().writeDelimitedTo(src); |
| WorkRequest.newBuilder().setRequestId(42).setCancel(true).build().writeDelimitedTo(src); |
| cancelCalled.acquire(); |
| waitForCancel.release(); |
| requestsDone.acquire(); |
| messageProcessor.stop(); |
| done.acquire(); |
| |
| WorkResponse response = WorkResponse.parseDelimitedFrom(dest); |
| assertThat(cancelCalled.availablePermits()).isLessThan(2); |
| assertThat(response.getRequestId()).isEqualTo(42); |
| assertThat(response.getOutput()).isEmpty(); |
| assertThat(response.getWasCancelled()).isTrue(); |
| |
| // Checks that nothing more was sent. |
| assertThat(dest.available()).isEqualTo(0); |
| src.close(); |
| finish.release(); |
| |
| // Checks that there weren't other unexpected failures. |
| assertThat(failures).isEmpty(); |
| } |
| |
| @Test |
| public void testCancelRequest_sendsNoResponseWhenAlreadySent() |
| throws IOException, InterruptedException { |
| Semaphore handlerCalled = new Semaphore(0); |
| PipedOutputStream src = new PipedOutputStream(); |
| PipedInputStream dest = new PipedInputStream(); |
| Semaphore done = new Semaphore(0); |
| Semaphore finish = new Semaphore(0); |
| List<String> failures = new ArrayList<>(); |
| |
| // We force the cancel request to not happen until after we have read the normal response, |
| // to avoid flakiness. |
| StoppableWorkerMessageProcessor messageProcessor = |
| new StoppableWorkerMessageProcessor( |
| new ProtoWorkerMessageProcessor( |
| new PipedInputStream(src), new PipedOutputStream(dest))); |
| WorkRequestHandler handler = |
| new WorkRequestHandlerBuilder( |
| (args, err) -> { |
| handlerCalled.release(); |
| err.println("Such work! Much progress! Wow!"); |
| return 2; |
| }, |
| new PrintStream(new ByteArrayOutputStream()), |
| messageProcessor) |
| .setCancelCallback((i, t) -> {}) |
| .build(); |
| |
| runRequestHandlerThread(done, handler, finish, failures); |
| WorkRequest.newBuilder().setRequestId(42).build().writeDelimitedTo(src); |
| WorkResponse response = WorkResponse.parseDelimitedFrom(dest); |
| WorkRequest.newBuilder().setRequestId(42).setCancel(true).build().writeDelimitedTo(src); |
| messageProcessor.stop(); |
| done.acquire(); |
| |
| assertThat(response).isNotNull(); |
| |
| assertThat(handlerCalled.availablePermits()).isEqualTo(1); |
| assertThat(response.getRequestId()).isEqualTo(42); |
| assertThat(response.getWasCancelled()).isFalse(); |
| assertThat(response.getExitCode()).isEqualTo(2); |
| assertThat(response.getOutput()).isEqualTo("Such work! Much progress! Wow!\n"); |
| |
| // Checks that nothing more was sent. |
| assertThat(dest.available()).isEqualTo(0); |
| src.close(); |
| finish.release(); |
| |
| // Checks that there weren't other unexpected failures. |
| assertThat(failures).isEmpty(); |
| } |
| |
| @Test |
| public void testWorkRequestHandler_withWorkRequestCallback() throws IOException { |
| ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| WorkRequestCallback callback = |
| new WorkRequestCallback((request, err) -> request.getArgumentsCount()); |
| WorkRequestHandler handler = |
| new WorkRequestHandlerBuilder( |
| callback, |
| new PrintStream(new ByteArrayOutputStream()), |
| new ProtoWorkerMessageProcessor(new ByteArrayInputStream(new byte[0]), out)) |
| .build(); |
| |
| List<String> args = Arrays.asList("--sources", "B.java"); |
| WorkRequest request = WorkRequest.newBuilder().addAllArguments(args).build(); |
| handler.respondToRequest(testWorkerIO, request, new RequestInfo(null)); |
| |
| WorkResponse response = |
| WorkResponse.parseDelimitedFrom(new ByteArrayInputStream(out.toByteArray())); |
| assertThat(response.getRequestId()).isEqualTo(0); |
| assertThat(response.getExitCode()).isEqualTo(2); |
| assertThat(response.getOutput()).isEmpty(); |
| } |
| |
| private void runRequestHandlerThread( |
| Semaphore done, WorkRequestHandler handler, Semaphore finish, List<String> failures) { |
| // This thread just makes sure the WorkRequestHandler does work asynchronously. |
| new Thread( |
| () -> { |
| try { |
| handler.processRequests(); |
| while (!handler.activeRequests.isEmpty()) { |
| Thread.sleep(1); |
| } |
| } catch (IOException e) { |
| failures.add("Unexpected I/O error talking to worker thread"); |
| e.printStackTrace(); |
| } catch (InterruptedException e) { |
| // Getting interrupted while waiting for requests to finish is OK. |
| } |
| try { |
| done.release(); |
| finish.acquire(); |
| } catch (InterruptedException e) { |
| // Getting interrupted at the end is OK. |
| } |
| }) |
| .start(); |
| } |
| |
| @Test |
| public void testWorkerIO_doesWrapSystemStreams() throws Exception { |
| // Save the original streams |
| InputStream originalInputStream = System.in; |
| PrintStream originalOutputStream = System.out; |
| PrintStream originalErrorStream = System.err; |
| |
| // Swap in the test streams to assert against |
| ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(new byte[0]); |
| System.setIn(byteArrayInputStream); |
| PrintStream outputBuffer = new PrintStream(new ByteArrayOutputStream(), true); |
| System.setOut(outputBuffer); |
| System.setErr(outputBuffer); |
| |
| try (outputBuffer; |
| byteArrayInputStream; |
| WorkRequestHandler.WorkerIO io = WorkRequestHandler.WorkerIO.capture()) { |
| // Assert that the WorkerIO returns the correct wrapped streams and the new System instance |
| // has been swapped out with the wrapped one |
| assertThat(io.getOriginalInputStream()).isSameInstanceAs(byteArrayInputStream); |
| assertThat(System.in).isNotSameInstanceAs(byteArrayInputStream); |
| |
| assertThat(io.getOriginalOutputStream()).isSameInstanceAs(outputBuffer); |
| assertThat(System.out).isNotSameInstanceAs(outputBuffer); |
| |
| assertThat(io.getOriginalErrorStream()).isSameInstanceAs(outputBuffer); |
| assertThat(System.err).isNotSameInstanceAs(outputBuffer); |
| } finally { |
| // Swap back in the original streams |
| System.setIn(originalInputStream); |
| System.setOut(originalOutputStream); |
| System.setErr(originalErrorStream); |
| } |
| } |
| |
| @Test |
| public void testWorkerIO_doesCaptureStandardOutAndErrorStreams() throws Exception { |
| try (WorkRequestHandler.WorkerIO io = WorkRequestHandler.WorkerIO.capture()) { |
| // Assert that nothing has been captured in the new instance |
| assertThat(io.readCapturedAsUtf8String()).isEmpty(); |
| |
| // Assert that the standard out/error stream redirect to our own streams |
| System.out.print("This is a standard out message!"); |
| System.err.print("This is a standard error message!"); |
| assertThat(io.readCapturedAsUtf8String()) |
| .isEqualTo("This is a standard out message!This is a standard error message!"); |
| |
| // Assert that readCapturedAsUtf8String calls reset on the captured stream after a read |
| assertThat(io.readCapturedAsUtf8String()).isEmpty(); |
| |
| System.out.print("out 1"); |
| System.err.print("err 1"); |
| System.out.print("out 2"); |
| System.err.print("err 2"); |
| assertThat(io.readCapturedAsUtf8String()).isEqualTo("out 1err 1out 2err 2"); |
| assertThat(io.readCapturedAsUtf8String()).isEmpty(); |
| } |
| } |
| |
| private WorkRequestHandler.WorkerIO createTestWorkerIO() { |
| ByteArrayOutputStream captured = new ByteArrayOutputStream(); |
| return new WorkRequestHandler.WorkerIO(System.in, System.out, System.err, captured, captured); |
| } |
| |
| /** A wrapper around a WorkerMessageProcessor that can be stopped by calling {@code #stop()}. */ |
| private static class StoppableWorkerMessageProcessor implements WorkerMessageProcessor { |
| private final WorkerMessageProcessor delegate; |
| private final AtomicBoolean stop = new AtomicBoolean(false); |
| private Thread readerThread; |
| |
| public StoppableWorkerMessageProcessor(WorkerMessageProcessor delegate) { |
| this.delegate = delegate; |
| } |
| |
| @Override |
| public WorkRequest readWorkRequest() throws IOException { |
| readerThread = Thread.currentThread(); |
| if (stop.get()) { |
| return null; |
| } else { |
| try { |
| return delegate.readWorkRequest(); |
| } catch (InterruptedIOException e) { |
| // Being interrupted is only an error if we didn't ask for it. |
| if (!stop.get()) { |
| throw e; |
| } else { |
| return null; |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void writeWorkResponse(WorkResponse workResponse) throws IOException { |
| delegate.writeWorkResponse(workResponse); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| delegate.close(); |
| } |
| |
| public void stop() { |
| stop.set(true); |
| if (readerThread != null) { |
| readerThread.interrupt(); |
| } |
| } |
| } |
| } |
