[WFLY-17740] Add missing @fallback test in Microprofile Fault Tolerance quickstart

Author: ChristinaDsl

microprofile-fault-tolerance/src/main/java/org/wildfly/quickstarts/microprofile/faulttolerance/Coffee.java

@@ -37,4 +37,9 @@ public Coffee(Integer id, String name, String countryOfOrigin, Integer price) {
         this.countryOfOrigin = countryOfOrigin;
         this.price = price;
     }
+
+    public int getId() {
+        return id;
+    }
+
 }

microprofile-fault-tolerance/src/main/java/org/wildfly/quickstarts/microprofile/faulttolerance/CoffeeRepositoryService.java

@@ -65,6 +65,7 @@ public List<Coffee> getRecommendations(Integer id) {
         if (id == null) {
             return Collections.emptyList();
         }
+
         return coffeeList.values().stream()
                 .filter(coffee -> !id.equals(coffee.id))
                 .limit(2)

microprofile-fault-tolerance/src/main/java/org/wildfly/quickstarts/microprofile/faulttolerance/CoffeeResource.java

@@ -55,6 +55,10 @@ public class CoffeeResource {
 
     private Float failRatio = 0.5f;
 
+    private int minDelay = 0;
+
+    private int maxDelay = 500;
+
     /**
      * Provides list of all our coffees.
      * <p>
@@ -139,6 +143,7 @@ public List<Coffee> recommendations(@PathParam("id") int id) {
 
         try {
             randomDelay();
+
             LOGGER.infof("CoffeeResource#recommendations() invocation #%d returning successfully", invocationNumber);
             return coffeeRepository.getRecommendations(id);
         } catch (InterruptedException e) {
@@ -157,7 +162,6 @@ public List<Coffee> fallbackRecommendations(int id) {
         return Collections.singletonList(coffeeRepository.getCoffeeById(1));
     }
 
-
     private void maybeFail(String failureLogMessage) {
         // introduce some artificial failures
         if (new Random().nextFloat() < failRatio) {
@@ -168,7 +172,7 @@ private void maybeFail(String failureLogMessage) {
 
     private void randomDelay() throws InterruptedException {
         // introduce some artificial delay
-        Thread.sleep(new Random().nextInt(500));
+        Thread.sleep(new Random().nextInt(maxDelay - minDelay) + minDelay);
     }
 
     // The following methods are only used for automated integration testing
@@ -179,6 +183,18 @@ public void setFailRatio(@PathParam("failRatio") Float failRatio) {
         this.failRatio = failRatio;
     }
 
+    @GET
+    @Path("/setMaxDelay/{maxDelay}")
+    public void setMaxDelay(@PathParam("maxDelay") int maxDelay) {
+        this.maxDelay = maxDelay;
+    }
+
+    @GET
+    @Path("/setMinDelay/{minDelay}")
+    public void setMinDelay(@PathParam("minDelay") int minDelay) {
+        this.minDelay = minDelay;
+    }
+
     @GET
     @Path("/getCounter")
     public Long getCounter() {

microprofile-fault-tolerance/src/test/java/org/wildfly/quickstarts/microprofile/faulttolerance/CoffeeResourceIT.java

@@ -17,6 +17,8 @@
 package org.wildfly.quickstarts.microprofile.faulttolerance;
 
 import java.util.List;
+import java.util.ArrayList;
+
 import jakarta.ws.rs.client.Client;
 import jakarta.ws.rs.client.ClientBuilder;
 import jakarta.ws.rs.core.GenericType;
@@ -37,6 +39,7 @@
  * @author Radoslav Husar
  * @author Eduardo Martins
  */
+
 public class CoffeeResourceIT {
 
     private Client client;
@@ -124,6 +127,58 @@ private void resetCounter() {
         }
     }
 
+    /**
+     * Testing whether customer has at his disposal all the suggestions for coffee.
+     * <p>
+     * In cases of small-time delay, the total number of recommendations will appear and fallbackMethod won't be called.
+    */
+    @Test
+    public void testCoffeeRecommendations() {
+        setMinDelay(0);
+        setMaxDelay(250);
+
+        try (Response response = this.getResponse("/coffee/1/recommendations")) {
+            Assert.assertEquals(200, response.getStatus());
+            ArrayList<Coffee> ordersList = response.readEntity(new GenericType<ArrayList<Coffee>>() {});
+            Assert.assertNotNull(ordersList);
+            Assert.assertEquals(2, ordersList.size());
+            Assert.assertNotEquals(1, ordersList.get(0).getId());
+            Assert.assertNotEquals(1, ordersList.get(1).getId());
+        }
+    }
+
+   /**
+     * Testing if fallbackMethod will offer to the customer one recommendation.
+     * <p>
+     * In cases of big-time delay fallbackMethod will propose a safe recommendation choice.
+    */
+    @Test
+    public void testCoffeeRecommendationsSafeChoice() {
+        setMinDelay(251);
+        setMaxDelay(500);
+
+        try (Response response = this.getResponse("/coffee/1/recommendations")) {
+            Assert.assertEquals(200, response.getStatus());
+
+            ArrayList<Coffee> ordersList = response.readEntity(new GenericType<ArrayList<Coffee>>() {});
+            Assert.assertNotNull(ordersList);
+            Assert.assertEquals(1, ordersList.size());
+            Assert.assertEquals(1, ordersList.get(0).getId());
+        }
+    }
+
+    private void setMaxDelay(int maxDelay) {
+        try (Response response = this.getResponse("/coffee/setMaxDelay/" + maxDelay)) {
+            Assert.assertEquals(204, response.getStatus());
+        }
+    }
+
+    private void setMinDelay(int minDelay) {
+        try (Response response = this.getResponse("/coffee/setMinDelay/" + minDelay)) {
+            Assert.assertEquals(204, response.getStatus());
+        }
+    }
+
     private Response getResponse(String path) {
         return client.target(TestUtils.getServerHost())
                 .path(path)