add NAME_CACHE concurrent test

core/src/test/java/com/alibaba/fastjson2/JSONFactoryNameCacheTest.java

@@ -0,0 +1,76 @@
+package com.alibaba.fastjson2;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Random;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static com.alibaba.fastjson2.JSONFactory.NAME_CACHE;
+import static com.alibaba.fastjson2.JSONFactory.NAME_CACHE2;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class JSONFactoryNameCacheTest {
+    @Test
+    public void test() throws Exception {
+        Arrays.fill(NAME_CACHE, 0, NAME_CACHE.length, null);
+        Arrays.fill(NAME_CACHE2, 0, NAME_CACHE2.length, null);
+
+        final AtomicLong errorCount = new AtomicLong();
+        Random r = new Random();
+        ExecutorService executor = Executors.newFixedThreadPool(16);
+
+        final int COUNT = 100000;
+        CountDownLatch latch = new CountDownLatch(COUNT);
+        for (int j = 0; j < COUNT; j++) {
+            int len = r.nextInt(16);
+            byte[] bytes = new byte[len];
+            for (int i = 0; i < len; i++) {
+                bytes[i] = (byte) r.nextInt(127);
+            }
+
+            String str = new String(bytes, 0, len);
+            executor.submit(new Task(str, latch, errorCount));
+        }
+
+        latch.await();
+    }
+
+    public static class Task
+            implements Runnable {
+        final CountDownLatch latch;
+        final AtomicLong errorCount;
+        final String str;
+
+        public Task(String str, CountDownLatch latch, AtomicLong errorCount) {
+            this.str = str;
+            this.latch = latch;
+            this.errorCount = errorCount;
+        }
+
+        @Override
+        public void run() {
+            try {
+                JSONWriter jsonWriter = JSONWriter.ofJSONB();
+                jsonWriter.startObject();
+                jsonWriter.writeName(str);
+                jsonWriter.writeInt32(1);
+                jsonWriter.endObject();
+
+                byte[] jsonbBytes = jsonWriter.getBytes();
+                JSONReader reader = JSONReader.ofJSONB(jsonbBytes);
+                assertTrue(reader.nextIfObjectStart());
+                String str1 = reader.readFieldName();
+                if (!str.equals(str1)) {
+                    errorCount.incrementAndGet();
+                    System.err.println(str);
+                }
+            } finally {
+                latch.countDown();
+            }
+        }
+    }
+}