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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.activemq.artemis.tests.integration.cluster.failover;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.junit.jupiter.api.Assertions.fail;
  
  import java.lang.invoke.MethodHandles;
  import java.util.Map;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.activemq.artemis.api.core.QueueConfiguration;
  import org.apache.activemq.artemis.api.core.SimpleString;
  import org.apache.activemq.artemis.api.core.TransportConfiguration;
  import org.apache.activemq.artemis.api.core.client.ClientConsumer;
  import org.apache.activemq.artemis.api.core.client.ClientMessage;
  import org.apache.activemq.artemis.api.core.client.ClientProducer;
  import org.apache.activemq.artemis.api.core.client.ClientSession;
  import org.apache.activemq.artemis.api.core.client.ClientSessionFactory;
  import org.apache.activemq.artemis.api.core.client.ServerLocator;
  import org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryInternal;
  import org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl;
  import org.apache.activemq.artemis.core.server.ActiveMQServer;
  import org.apache.activemq.artemis.jms.client.ActiveMQTextMessage;
  import org.apache.activemq.artemis.tests.integration.cluster.util.TestableServer;
  import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public abstract class MultipleBackupsFailoverTestBase extends ActiveMQTestBase {
  
     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  
     protected abstract boolean isNetty();
  
     protected int waitForNewPrimary(long seconds,
                                     boolean waitForNewBackup,
                                     Map<Integer, TestableServer> servers,
                                     int... nodes) {
        long time = System.currentTimeMillis();
        long toWait = seconds * 1000;
        int newPrimary = -1;
        while (true) {
           for (int node : nodes) {
              TestableServer backupServer = servers.get(node);
              if (newPrimary == -1 && backupServer.isActive()) {
                 newPrimary = node;
              } else if (newPrimary != -1) {
                 if (waitForNewBackup) {
                    if (node != newPrimary && servers.get(node).isStarted()) {
                       return newPrimary;
                    }
                 } else {
                    return newPrimary;
                 }
              }
           }
  
           try {
              Thread.sleep(100);
           } catch (InterruptedException e) {
              // ignore
           }
           if (System.currentTimeMillis() > (time + toWait)) {
              fail("backup server never started");
           }
        }
     }
  
     protected ClientSession sendAndConsume(final ClientSessionFactory sf, final boolean createQueue) throws Exception {
        ClientSession session = sf.createSession(false, true, true);
  
        if (createQueue) {
           session.createQueue(QueueConfiguration.of(FailoverTestBase.ADDRESS).setDurable(false));
        }
  
        ClientProducer producer = session.createProducer(FailoverTestBase.ADDRESS);
  
        final int numMessages = 1000;
  
        for (int i = 0; i < numMessages; i++) {
           ClientMessage message = session.createMessage(ActiveMQTextMessage.TYPE, false, 0, System.currentTimeMillis(), (byte) 1);
           message.putIntProperty(SimpleString.of("count"), i);
           message.getBodyBuffer().writeString("aardvarks");
           producer.send(message);
        }
  
        ClientConsumer consumer = session.createConsumer(FailoverTestBase.ADDRESS);
  
        session.start();
  
        for (int i = 0; i < numMessages; i++) {
           ClientMessage message2 = consumer.receive(10000);
  
           assertNotNull(message2);
  
           assertEquals("aardvarks", message2.getBodyBuffer().readString());
  
           assertEquals(i, message2.getObjectProperty(SimpleString.of("count")));
  
           message2.acknowledge();
        }
  
        ClientMessage message3 = consumer.receiveImmediate();
  
        assertNull(message3);
  
        return session;
     }
  
     protected ClientSessionFactoryInternal createSessionFactoryAndWaitForTopology(ServerLocator locator,
                                                                                   int topologyMembers) throws Exception {
        return createSessionFactoryAndWaitForTopology(locator, topologyMembers, null);
     }
  
     protected ClientSessionFactoryInternal createSessionFactoryAndWaitForTopology(ServerLocator locator,
                                                                                   int topologyMembers,
                                                                                   ActiveMQServer server) throws Exception {
        ClientSessionFactoryInternal sf;
        CountDownLatch countDownLatch = new CountDownLatch(topologyMembers);
  
        FailoverTestBase.LatchClusterTopologyListener topListener = new FailoverTestBase.LatchClusterTopologyListener(countDownLatch);
        locator.addClusterTopologyListener(topListener);
  
        sf = (ClientSessionFactoryInternal) locator.createSessionFactory();
        addSessionFactory(sf);
  
        boolean ok = countDownLatch.await(5, TimeUnit.SECONDS);
        locator.removeClusterTopologyListener(topListener);
        if (!ok) {
           if (server != null) {
              logger.warn("failed topology, Topology on server = {}", server.getClusterManager().describe());
           }
        }
        assertTrue(ok, "expected " + topologyMembers + " members");
        return sf;
     }
  
     public ServerLocator getServerLocator(int... nodes) {
        TransportConfiguration[] configs = new TransportConfiguration[nodes.length];
        for (int i = 0, configsLength = configs.length; i < configsLength; i++) {
           configs[i] = createTransportConfiguration(isNetty(), false, generateParams(nodes[i], isNetty()));
        }
        return addServerLocator(new ServerLocatorImpl(true, configs));
     }
  }
  