Add failing test for #1144

src/test/java/com/fasterxml/jackson/failing/async/FilteringOnAsyncInfiniteLoop1144Test.java

@@ -0,0 +1,78 @@
+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;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+public class FilteringOnAsyncInfiniteLoop1144Test
+{
+    private final JsonFactory JSON_F = new JsonFactory();
+
+    private final byte[] DOC = "{\"first\":1,\"second\":2}"
+            .getBytes(StandardCharsets.UTF_8);
+
+    // Just to show expected filtering behavior with blocking alternative
+    @Test
+    public void testFilteringBlockingParser() throws Exception
+    {
+        try (JsonParser p = JSON_F.createParser(DOC)) {
+            try (JsonParser fp = new FilteringParserDelegate(p,
+                new JsonPointerBasedFilter("/second"),
+                    TokenFilter.Inclusion.ONLY_INCLUDE_ALL, false)) {
+                assertEquals(JsonToken.VALUE_NUMBER_INT, fp.nextToken());
+                assertEquals(2, fp.getIntValue());
+                assertNull(fp.nextToken());
+            }
+        }
+    }
+
+    // And here's reproduction of infinite loop
+    @SuppressWarnings("resource")
+    @Test
+    public void testFilteringNonBlockingParser() throws Exception
+    {
+        JsonParser nonBlockingParser = JSON_F.createNonBlockingByteArrayParser();
+        ByteArrayFeeder inputFeeder = (ByteArrayFeeder) nonBlockingParser.getNonBlockingInputFeeder();
+
+        // If we did this, things would work:
+        /*
+        inputFeeder.feedInput(DOC, 0, DOC.length);
+        inputFeeder.endOfInput();
+         */
+
+        JsonParser filteringParser = new FilteringParserDelegate(nonBlockingParser,
+                new JsonPointerBasedFilter("/second"),
+                    TokenFilter.Inclusion.ONLY_INCLUDE_ALL, false);
+
+        ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
+        executor.schedule(() -> {
+            try {
+                // This doesn't seem to make a difference:
+                inputFeeder.feedInput(DOC, 0, DOC.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);
+    }
+}