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 com.datastax.oss.driver.internal.core;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.fail;
  
  import java.util.concurrent.CancellationException;
  import java.util.concurrent.CompletionStage;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import java.util.function.Consumer;
  import org.assertj.core.api.AbstractAssert;
  
  public class CompletionStageAssert<V>
      extends AbstractAssert<CompletionStageAssert<V>, CompletionStage<V>> {
  
    public CompletionStageAssert(CompletionStage<V> actual) {
      super(actual, CompletionStageAssert.class);
    }
  
    public CompletionStageAssert<V> isSuccess(Consumer<V> valueAssertions) {
      try {
        V value = actual.toCompletableFuture().get(2, TimeUnit.SECONDS);
        valueAssertions.accept(value);
      } catch (TimeoutException e) {
        fail("Future did not complete within the timeout");
      } catch (Throwable t) {
        fail("Unexpected error while waiting on the future", t);
      }
      return this;
    }
  
    public CompletionStageAssert<V> isSuccess() {
      return isSuccess(v -> {});
    }
  
    public CompletionStageAssert<V> isFailed(Consumer<Throwable> failureAssertions) {
      try {
        actual.toCompletableFuture().get(2, TimeUnit.SECONDS);
        fail("Expected completion stage to fail");
      } catch (TimeoutException e) {
        fail("Future did not complete within the timeout");
      } catch (InterruptedException e) {
        fail("Interrupted while waiting for future to fail");
      } catch (ExecutionException e) {
        failureAssertions.accept(e.getCause());
      }
      return this;
    }
  
    public CompletionStageAssert<V> isFailed() {
      return isFailed(f -> {});
    }
  
    public CompletionStageAssert<V> isCancelled() {
      boolean cancelled = false;
      try {
        actual.toCompletableFuture().get(2, TimeUnit.SECONDS);
      } catch (CancellationException e) {
        cancelled = true;
      } catch (Exception ignored) {
      }
      if (!cancelled) {
        fail("Expected completion stage to be cancelled");
      }
      return this;
    }
  
    public CompletionStageAssert<V> isNotCancelled() {
      boolean cancelled = false;
      try {
        actual.toCompletableFuture().get(2, TimeUnit.SECONDS);
      } catch (CancellationException e) {
        cancelled = true;
      } catch (Exception ignored) {
      }
      if (cancelled) {
        fail("Expected completion stage not to be cancelled");
      }
      return this;
    }
  
    public CompletionStageAssert<V> isDone() {
      assertThat(actual.toCompletableFuture().isDone())
          .overridingErrorMessage("Expected completion stage to be done")
          .isTrue();
      return this;
    }
  
    public CompletionStageAssert<V> isNotDone() {
      assertThat(actual.toCompletableFuture().isDone())
          .overridingErrorMessage("Expected completion stage not to be done")
          .isFalse();
      return this;
    }
  }
  