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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.processing.execution.test;
import com.google.common.util.concurrent.MoreExecutors;
import com.yahoo.component.chain.Chain;
import com.yahoo.processing.Processor;
import com.yahoo.processing.Request;
import com.yahoo.processing.Response;
import com.yahoo.processing.execution.Execution;
import com.yahoo.processing.response.Data;
import com.yahoo.processing.response.IncomingData;
import com.yahoo.processing.test.ProcessorLibrary;
import org.junit.jupiter.api.Test;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* Tests listening on every available new piece of data in a response
*
* @author bratseth
*/
public class StreamingTestCase {
/** Tests adding a chain which is called every time new data is added to a data list */
@SuppressWarnings({"unchecked"})
@Test
void testStreamingData() throws InterruptedException, ExecutionException, TimeoutException {
// Set up
StreamProcessor streamProcessor = new StreamProcessor();
Chain<Processor> streamProcessing = new Chain<Processor>(streamProcessor);
ProcessorLibrary.FutureDataSource futureDataSource = new ProcessorLibrary.FutureDataSource();
Chain<Processor> main = new Chain<>(new ProcessorLibrary.DataCounter(),
new ProcessorLibrary.StreamProcessingInitiator(streamProcessing),
futureDataSource);
// Execute
Request request = new Request();
Response response = Execution.createRoot(main, 0, Execution.Environment.createEmpty()).process(request);
IncomingData incomingData = futureDataSource.incomingData.get(0);
// State prior to receiving any additional data
assertEquals(1, response.data().asList().size());
assertEquals("Data count: 0", response.data().get(0).toString());
assertEquals(1, streamProcessor.invocationCount, "Add data listener invoked also for DataCounter");
assertEquals(1, response.data().asList().size(), "Initial data count");
// add first data - we have no listener so the data is held in the incoming buffer
incomingData.add(new ProcessorLibrary.StringData(request, "d1"));
assertEquals(1, streamProcessor.invocationCount, "Data add listener not invoked as we are not listening on new data yet");
assertEquals(1, response.data().asList().size(), "New data is not consumed");
// start listening on incoming data - this is what a renderer will do
incomingData.addNewDataListener(new MockNewDataListener(incomingData), MoreExecutors.directExecutor());
assertEquals(2, streamProcessor.invocationCount, "We got a data add event for the data which was already added");
assertEquals(2, response.data().asList().size(), "New data is consumed");
incomingData.add(new ProcessorLibrary.StringData(request, "d2"));
assertEquals(3, streamProcessor.invocationCount, "We are now getting data add events each time");
assertEquals(3, response.data().asList().size(), "New data is consumed");
incomingData.addLast(new ProcessorLibrary.StringData(request, "d3"));
assertEquals(4, streamProcessor.invocationCount, "We are getting data add events also the last time");
assertEquals(4, response.data().asList().size(), "New data is consumed");
response.data().completeFuture().get(1000, TimeUnit.MILLISECONDS); // no-op here
assertEquals("d1", response.data().get(1).toString().toString());
assertEquals("d2", response.data().get(2).toString().toString());
assertEquals("d3", response.data().get(3).toString().toString());
}
private static class MockNewDataListener implements Runnable {
private final IncomingData<Data> incomingData;
public MockNewDataListener(IncomingData<Data> incomingData) {
this.incomingData = incomingData;
}
@Override
public void run() {
// consume new data
for (Data newData : incomingData.drain()) {
incomingData.getOwner().add(newData);
}
// actual rendering would go here (at this point data add listeners will have executed)
}
}
private static class StreamProcessor extends Processor {
int invocationCount;
@Override
public Response process(Request request, Execution execution) {
invocationCount++;
return execution.process(request);
}
}
}
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