How does spring singleton beans serve concurrent requests (#11987)

* add service base structure - controllers & services & sanity check tests * finalize code * reformat continues lines with 2 spaces * reformat continues lines with 2 spaces
2022-04-09 06:29:33 +03:00
parent 4bcb36ff41
commit bb7d2a5d55
6 changed files with 165 additions and 0 deletions
@@ -0,0 +1,53 @@
+package com.baeldung.concurrentrequest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.ResultMatcher;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+public class ConcurrentRequestUnitTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Autowired
+    private ProductController controller;
+
+    @Test
+    public void givenContextLoads_thenProductControllerIsAvailable() {
+        assertThat(controller).isNotNull();
+    }
+
+    @Test
+    public void givenMultipleCallsRunInParallel_thenAllCallsReturn200() throws Exception {
+        ExecutorService executor = Executors.newFixedThreadPool(2);
+
+        executor.submit(() -> performCall("/product/1", status().isOk()));
+        executor.submit(() -> performCall("/product/2/stock", status().isOk()));
+
+        if (!executor.awaitTermination(60, TimeUnit.SECONDS)) {
+            executor.shutdownNow();
+        }
+    }
+
+    private void performCall(String url, ResultMatcher expect) {
+        try {
+            this.mockMvc.perform(get(url))
+              .andExpect(expect);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+}