ratis-server/src/test/java/org/apache/ratis/RaftAsyncExceptionTests.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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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package org.apache.ratis;

import org.apache.ratis.client.RaftClient;
import org.apache.ratis.RaftTestUtil.SimpleMessage;
import org.apache.ratis.protocol.AlreadyClosedException;
import org.apache.ratis.protocol.GroupMismatchException;
import org.apache.ratis.protocol.RaftClientReply;
import org.apache.ratis.protocol.RaftGroup;
import org.apache.ratis.protocol.RaftGroupId;
import org.junit.Assert;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

public abstract class RaftAsyncExceptionTests<CLUSTER extends MiniRaftCluster>
    extends BaseTest
    implements MiniRaftCluster.Factory.Get<CLUSTER> {

  @Test
  public void testGroupMismatchException() throws Exception {
    runWithNewCluster(1, this::runTestGroupMismatchException);
  }

  private void runTestGroupMismatchException(CLUSTER cluster) throws Exception {
    // send a message to make sure the cluster is working
    try(RaftClient client = cluster.createClient()) {
      final RaftClientReply reply = client.sendAsync(new SimpleMessage("first")).get();
      Assert.assertTrue(reply.isSuccess());
    }

    // create another group
    final RaftGroup clusterGroup = cluster.getGroup();
    final RaftGroup anotherGroup = RaftGroup.valueOf(RaftGroupId.randomId(), clusterGroup.getPeers());
    Assert.assertNotEquals(clusterGroup.getGroupId(), anotherGroup.getGroupId());

    // create another client using another group
    final SimpleMessage[] messages = SimpleMessage.create(5);
    try(RaftClient client = cluster.createClient(anotherGroup)) {
      // send a few messages
      final List<CompletableFuture<RaftClientReply>> futures = new ArrayList<>();
      for(SimpleMessage m : messages) {
        futures.add(client.sendAsync(m));
      }
      Assert.assertEquals(messages.length, futures.size());

      // check replies
      final Iterator<CompletableFuture<RaftClientReply>> i = futures.iterator();
      testFailureCase("First reply is GroupMismatchException",
          () -> i.next().get(),
          ExecutionException.class, GroupMismatchException.class);
      for(; i.hasNext(); ) {
        testFailureCase("Following replies are AlreadyClosedException caused by GroupMismatchException",
            () -> i.next().get(),
            ExecutionException.class, AlreadyClosedException.class, GroupMismatchException.class);
      }
    }
  }
}