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   * 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.camel.quarkus.component.master.it;
  
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import io.quarkus.test.junit.QuarkusTest;
  import io.restassured.RestAssured;
  import org.apache.camel.quarkus.test.support.process.QuarkusProcessExecutor;
  import org.apache.commons.io.FileUtils;
  import org.awaitility.Awaitility;
  import org.junit.jupiter.api.BeforeAll;
  import org.junit.jupiter.api.Test;
  import org.zeroturnaround.exec.StartedProcess;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.emptyString;
  
  @QuarkusTest
  class MasterFileTest {
  
      @BeforeAll
      public static void deleteClusterFiles() throws IOException {
          FileUtils.deleteDirectory(Paths.get("target/cluster/").toFile());
      }
  
      @Test
      public void testFailover() throws IOException {
  
          List<String> jvmArgs = new ArrayList<>();
          jvmArgs.add("-Dapplication.id=follower");
  
          // Start secondary application process
          QuarkusProcessExecutor quarkusProcessExecutor = new QuarkusProcessExecutor(jvmArgs.toArray(String[]::new));
          StartedProcess process = quarkusProcessExecutor.start();
  
          // Wait until the process is fully initialized
          awaitStartup(quarkusProcessExecutor);
  
          try {
              // Verify that this process is the cluster leader
              Awaitility.await().atMost(10, TimeUnit.SECONDS).with().until(() -> {
                  return readLeaderFile("leader").equals("leader");
              });
  
              // Verify the follower hasn't taken the leader role
              assertThat(readLeaderFile("follower"), emptyString());
  
              // Stop camel leader route to trigger fail-over
              RestAssured.given().get("/master/camel/stop/leader").then().statusCode(204);
  
              // Verify that the secondary application has been elected as the
              // cluster leader
              Awaitility.await().atMost(10, TimeUnit.SECONDS).until(() -> {
                  return readLeaderFile("follower").equals("leader");
              });
          } finally {
              if (process != null && process.getProcess().isAlive()) {
                  quarkusProcessExecutor.destroy();
              }
          }
      }
  
      private void awaitStartup(QuarkusProcessExecutor quarkusProcessExecutor) {
          Awaitility.await().atMost(10, TimeUnit.SECONDS).pollDelay(1, TimeUnit.SECONDS).until(() -> {
              return isApplicationHealthy(quarkusProcessExecutor.getHttpPort());
          });
      }
  
      private boolean isApplicationHealthy(int port) {
          try {
              int status = RestAssured.given().port(port).get("/q/health").then().extract().statusCode();
              return status == 200;
          } catch (Exception e) {
              return false;
          }
      }
  
      private String readLeaderFile(String fileName) throws IOException {
          Path path = Paths.get(String.format("target/cluster/%s.txt", fileName));
          if (path.toFile().exists()) {
              return FileUtils.readFileToString(path.toFile(), StandardCharsets.UTF_8);
          }
          return "";
      }
  }
  