/// <summary>
/// Removes a member from the cluster.
/// </summary>
/// <param name="memberId">The identifier of the member to remove.</param>
/// <returns>A task that will complete when the member has been removed.</returns>
protected async Task RemoveMember(Guid memberId)
{
if (RcMembers.TryRemove(memberId, out var member))
{
await RcClient.StopMemberAsync(RcCluster, member);
}
}
// this creates members & connect to the cluster, then removes all but 1 member,
// all while using the client - things should go smoothly
private async Task Run()
{
var totalStopwatch = Stopwatch.StartNew();
var stopwatch = new Stopwatch();
HConsole.WriteLine(this, $"Begin run on cluster {RcCluster.Id.Substring(0, 7)}");
// add all members
for (var i = 0; i < MembersTotal; i++)
{
HConsole.WriteLine(this, $"Add member #{i}...");
stopwatch.Restart();
var member = await AddMember();
HConsole.WriteLine(this, $"Added {member.Uuid.Substring(0, 7)} at {member.Host}:{member.Port} ({(int)stopwatch.Elapsed.TotalSeconds}s)");
}
// prepare options
var options = new HazelcastOptionsBuilder()
.WithHConsoleLogger()
.Build();
options.Networking.Addresses.Clear();
options.Networking.Addresses.Add("127.0.0.1:5701");
options.ClusterName = RcCluster.Id;
options.Messaging.RetryTimeoutSeconds = InvocationTimeoutMinutes * 60;
// subscribe to members updated
var membersCount = 0;
var createdObject = false;
options.AddSubscriber(events => events
.MembersUpdated((sender, args) =>
{
HConsole.WriteLine(this, $"Handle MembersUpdated ({args.Members.Count} members)");
membersCount = args.Members.Count;
})
.ObjectCreated((sender, args) =>
{
HConsole.WriteLine(this, $"Object {args.ServiceName}:{args.Name} created");
createdObject = true;
}));
// start client
HConsole.WriteLine(this, "Start client...");
await using var client = await HazelcastClientFactory.StartNewClientAsync(options);
await((HazelcastClient)client).DestroyAsync(ServiceNames.Map, "test-map").CfAwait();
// immediately begin using the client - while connections to all members are established
HConsole.WriteLine(this, "Get map...");
await using var map = await client.GetMapAsync <string, string>("test-map-" + RandomProvider.Random.Next(1000));
await AssertEx.SucceedsEventually(() =>
{
Assert.That(createdObject);
}, 2000, 200);
HConsole.WriteLine(this, "Use map...");
await UseClient(map, 2000, 200);
// all members are here
await AssertEx.SucceedsEventually(() =>
{
Assert.That(membersCount, Is.EqualTo(MembersTotal));
}, 2000, 200);
// keep using the client, but remove members down to 1 last member
HConsole.WriteLine(this, "Remove members...");
while (RcMembers.Count > 1)
{
var(memberId, member) = RcMembers.First();
HConsole.WriteLine(this, $"Remove member {member.Uuid.Substring(0, 7)} at {member.Host}:{member.Port}...");
stopwatch.Restart();
await RemoveMember(memberId);
HConsole.WriteLine(this, $"Removed member {member.Uuid.Substring(0, 7)} ({(int)stopwatch.Elapsed.TotalSeconds}s)");
await Task.Delay(500);
await UseClientOnce(map);
}
// take time for things to stabilize
// keep using the client
HConsole.WriteLine(this, "Use map...");
await UseClient(map, 2000, 200);
// all members but one are gone
await AssertEx.SucceedsEventually(() =>
{
Assert.That(membersCount, Is.EqualTo(1));
}, 8000, 200);
// now terminate the client
HConsole.WriteLine(this, "Dispose client...");
await client.DisposeAsync();
HConsole.WriteLine(this, $"End ({(int)totalStopwatch.Elapsed.TotalSeconds}s)");
}
