/*
    * 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.eclipse.aether.named;
  
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.LongAdder;
  
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TestName;
  
  import static org.eclipse.aether.named.support.Retry.retry;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  import static org.hamcrest.Matchers.greaterThan;
  
  /**
   * UT for {@link org.eclipse.aether.named.support.Retry}.
   */
  public class RetryTest {
      private static final long RETRY_SLEEP_MILLIS = 250L;
  
      @Rule
      public TestName testName = new TestName();
  
      @Test
      public void happy() throws InterruptedException {
          LongAdder retries = new LongAdder();
          String result = retry(
                  1L,
                  TimeUnit.SECONDS,
                  RETRY_SLEEP_MILLIS,
                  () -> {
                      retries.increment();
                      return "happy";
                  },
                  null,
                  "notHappy");
          assertThat(result, equalTo("happy"));
          assertThat(retries.sum(), equalTo(1L));
      }
  
      @Test
      public void notHappy() throws InterruptedException {
          LongAdder retries = new LongAdder();
          String result = retry(
                  1L,
                  TimeUnit.SECONDS,
                  RETRY_SLEEP_MILLIS,
                  () -> {
                      retries.increment();
                      return null;
                  },
                  null,
                  "notHappy");
          assertThat(result, equalTo("notHappy"));
          assertThat(retries.sum(), greaterThan(1L));
      }
  
      @Test
      public void happyAfterSomeTime() throws InterruptedException {
          LongAdder retries = new LongAdder();
          String result = retry(
                  1L,
                  TimeUnit.SECONDS,
                  RETRY_SLEEP_MILLIS,
                  () -> {
                      retries.increment();
                      return retries.sum() == 2 ? "got it" : null;
                  },
                  null,
                  "notHappy");
          assertThat(result, equalTo("got it"));
          assertThat(retries.sum(), equalTo(2L));
      }
  
      @Test
      public void happyFirstAttempt() throws InterruptedException {
          LongAdder retries = new LongAdder();
          String result = retry(
                  5,
                  RETRY_SLEEP_MILLIS,
                  () -> {
                     retries.increment();
                     return "happy";
                 },
                 null,
                 "notHappy");
         assertThat(result, equalTo("happy"));
         assertThat(retries.sum(), equalTo(1L));
     }
 
     @Test
     public void notHappyAnyAttempt() throws InterruptedException {
         LongAdder retries = new LongAdder();
         String result = retry(
                 5,
                 RETRY_SLEEP_MILLIS,
                 () -> {
                     retries.increment();
                     return null;
                 },
                 null,
                 "notHappy");
         assertThat(result, equalTo("notHappy"));
         assertThat(retries.sum(), equalTo(5L));
     }
 
     @Test
     public void happyAfterSomeAttempt() throws InterruptedException {
         LongAdder retries = new LongAdder();
         String result = retry(
                 5,
                 RETRY_SLEEP_MILLIS,
                 () -> {
                     retries.increment();
                     return retries.sum() == 3 ? "got it" : null;
                 },
                 null,
                 "notHappy");
         assertThat(result, equalTo("got it"));
         assertThat(retries.sum(), equalTo(3L));
     }
 }