content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.kafka.connect.util;
  
  import org.apache.kafka.common.errors.TimeoutException;
  import org.apache.kafka.common.errors.WakeupException;
  import org.apache.kafka.common.utils.MockTime;
  import org.apache.kafka.common.utils.Time;
  import org.apache.kafka.connect.errors.ConnectException;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mockito;
  import org.mockito.junit.jupiter.MockitoExtension;
  import org.mockito.junit.jupiter.MockitoSettings;
  import org.mockito.quality.Strictness;
  
  import java.time.Duration;
  import java.util.concurrent.Callable;
  import java.util.function.Supplier;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  @ExtendWith(MockitoExtension.class)
  @MockitoSettings(strictness = Strictness.STRICT_STUBS)
  public class RetryUtilTest {
  
      private final Time mockTime = new MockTime(10);
  
      private Callable<String> mockCallable;
      private final Supplier<String> testMsg = () -> "Test";
  
      @SuppressWarnings("unchecked")
      @BeforeEach
      public void setUp() throws Exception {
          mockCallable = Mockito.mock(Callable.class);
      }
  
      @Test
      public void testSuccess() throws Exception {
          Mockito.when(mockCallable.call()).thenReturn("success");
          assertEquals("success", RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(100), 1, mockTime));
          Mockito.verify(mockCallable, Mockito.times(1)).call();
      }
  
      @Test
      public void testExhaustingRetries() throws Exception {
          Mockito.when(mockCallable.call()).thenThrow(new TimeoutException("timeout exception"));
          ConnectException e = assertThrows(ConnectException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(50), 10, mockTime));
          Mockito.verify(mockCallable, Mockito.atLeastOnce()).call();
          assertTrue(e.getMessage().contains("Reason: timeout exception"));
      }
  
      @Test
      public void retriesEventuallySucceed() throws Exception {
          Mockito.when(mockCallable.call())
                  .thenThrow(new TimeoutException())
                  .thenThrow(new TimeoutException())
                  .thenThrow(new TimeoutException())
                  .thenReturn("success");
  
          assertEquals("success", RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(100), 1, mockTime));
          Mockito.verify(mockCallable, Mockito.times(4)).call();
      }
  
      @Test
      public void failWithNonRetriableException() throws Exception {
          Mockito.when(mockCallable.call())
                  .thenThrow(new TimeoutException("timeout"))
                  .thenThrow(new TimeoutException("timeout"))
                  .thenThrow(new TimeoutException("timeout"))
                  .thenThrow(new TimeoutException("timeout"))
                  .thenThrow(new TimeoutException("timeout"))
                  .thenThrow(new NullPointerException("Non retriable"));
          NullPointerException e = assertThrows(NullPointerException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(100), 0, mockTime));
          assertEquals("Non retriable", e.getMessage());
          Mockito.verify(mockCallable, Mockito.times(6)).call();
      }
  
      @Test
      public void noRetryAndSucceed() throws Exception {
          Mockito.when(mockCallable.call()).thenReturn("success");
  
          assertEquals("success", RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(0), 100, mockTime));
          Mockito.verify(mockCallable, Mockito.times(1)).call();
      }
  
      @Test
      public void noRetryAndFailed() throws Exception {
          Mockito.when(mockCallable.call()).thenThrow(new TimeoutException("timeout exception"));
  
          TimeoutException e = assertThrows(TimeoutException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(0), 100, mockTime));
          Mockito.verify(mockCallable, Mockito.times(1)).call();
          assertEquals("timeout exception", e.getMessage());
      }
  
      @Test
      public void testNoBackoffTimeAndSucceed() throws Exception {
          Mockito.when(mockCallable.call())
                  .thenThrow(new TimeoutException())
                  .thenThrow(new TimeoutException())
                  .thenThrow(new TimeoutException())
                  .thenReturn("success");
  
          assertEquals("success", RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(100), 0, mockTime));
          Mockito.verify(mockCallable, Mockito.times(4)).call();
      }
  
      @Test
      public void testNoBackoffTimeAndFail() throws Exception {
          Mockito.when(mockCallable.call()).thenThrow(new TimeoutException("timeout exception"));
  
          ConnectException e = assertThrows(ConnectException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(80), 0, mockTime));
          Mockito.verify(mockCallable, Mockito.atLeastOnce()).call();
          assertTrue(e.getMessage().contains("Reason: timeout exception"));
      }
  
      @Test
      public void testBackoffMoreThanTimeoutWillOnlyExecuteOnce() throws Exception {
          Mockito.when(mockCallable.call()).thenThrow(new TimeoutException("timeout exception"));
  
          assertThrows(TimeoutException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(50), 100, mockTime));
          Mockito.verify(mockCallable, Mockito.times(1)).call();
      }
  
      @Test
      public void testInvalidTimeDuration() throws Exception {
          Mockito.when(mockCallable.call()).thenReturn("success");
  
          assertEquals("success", RetryUtil.retryUntilTimeout(mockCallable, testMsg, null, 10, mockTime));
          assertEquals("success", RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(-1), 10, mockTime));
          Mockito.verify(mockCallable, Mockito.times(2)).call();
      }
  
      @Test
      public void testInvalidRetryTimeout() throws Exception {
          Mockito.when(mockCallable.call())
                  .thenThrow(new TimeoutException("timeout"))
                  .thenReturn("success");
          assertEquals("success", RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(100), -1, mockTime));
          Mockito.verify(mockCallable, Mockito.times(2)).call();
      }
  
      @Test
      public void testSupplier() throws Exception {
          Mockito.when(mockCallable.call()).thenThrow(new TimeoutException("timeout exception"));
  
          ConnectException e = assertThrows(ConnectException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, null, Duration.ofMillis(100), 10, mockTime));
          assertTrue(e.getMessage().startsWith("Fail to callable"));
  
          e = assertThrows(ConnectException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, () -> null, Duration.ofMillis(100), 10, mockTime));
          assertTrue(e.getMessage().startsWith("Fail to callable"));
  
          e = assertThrows(ConnectException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, () -> "execute lambda", Duration.ofMillis(500), 10, mockTime));
          assertTrue(e.getMessage().startsWith("Fail to execute lambda"));
          Mockito.verify(mockCallable, Mockito.atLeast(3)).call();
      }
  
      @Test
      public void testWakeupException() throws Exception {
          Mockito.when(mockCallable.call()).thenThrow(new WakeupException());
  
          assertThrows(ConnectException.class,
                  () -> RetryUtil.retryUntilTimeout(mockCallable, testMsg, Duration.ofMillis(50), 10, mockTime));
          Mockito.verify(mockCallable, Mockito.atLeastOnce()).call();
      }
  }
  