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Add failing test for #1144
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cowtowncoder committed Jan 15, 2024
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package com.fasterxml.jackson.failing.async;

import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import org.assertj.core.api.Assertions;
import org.junit.Test;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.async.ByteArrayFeeder;
import com.fasterxml.jackson.core.filter.FilteringParserDelegate;
import com.fasterxml.jackson.core.filter.JsonPointerBasedFilter;
import com.fasterxml.jackson.core.filter.TokenFilter;

public class FilteringOnAsyncInfiniteLoop1144Test
{
@SuppressWarnings("resource")
@Test
public void testFilteringNonBlockingParser() throws Exception
{
JsonFactory factory = new JsonFactoryBuilder().build();
JsonParser nonBlockingParser = factory.createNonBlockingByteArrayParser();
ByteArrayFeeder inputFeeder = (ByteArrayFeeder) nonBlockingParser.getNonBlockingInputFeeder();
String json = "{\"first\":1,\"second\":2}";
byte[] jsonBytes = json.getBytes(StandardCharsets.UTF_8);

JsonParser filteringParser = new FilteringParserDelegate(nonBlockingParser,
new JsonPointerBasedFilter("/second"),
TokenFilter.Inclusion.ONLY_INCLUDE_ALL, false);

ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
executor.schedule(() -> {
try {
inputFeeder.feedInput(jsonBytes, 0, jsonBytes.length);
} catch (Exception e) {
throw new RuntimeException(e);
}
}, 500, TimeUnit.MILLISECONDS);

Future<JsonToken> future = Executors.newSingleThreadExecutor().submit(() -> filteringParser.nextToken());
Assertions.assertThat(future)
.succeedsWithin(Duration.ofSeconds(5))
.isNotNull()
.isNotEqualTo(JsonToken.NOT_AVAILABLE);
}
}

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