public void PrimaryPreferred_should_select_the_primary_when_it_exists()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.PrimaryPreferred);
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _primary });
}
public void Secondary_should_select_only_secondaries_when_they_match_the_tags()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Secondary, new[] { new TagSet(new[] { new Tag("a", "1") }) }));
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _secondary1 });
}
public void SecondaryPreferred_should_select_the_primary_when_no_secondaries_exist_regardless_of_tags()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.SecondaryPreferred, new[] { new TagSet(new[] { new Tag("a", "2") }) }));
var result = subject.SelectServers(_description, new[] { _primary, _secondary1 }).ToList();
result.Should().BeEquivalentTo(new object[] { _primary });
}
public void Primary_should_select_none_when_no_primary_exists()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.Primary);
var result = subject.SelectServers(_description, new [] { _secondary1, _secondary2 }).ToList();
result.Should().BeEmpty();
}
public void Nearest_should_select_all_the_servers()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.Nearest);
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(_description.Servers);
}
public void SecondaryPreferred_should_select_the_primary_when_no_secondaries_exist()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.SecondaryPreferred);
var result = subject.SelectServers(_description, new [] { _primary }).ToList();
result.Should().BeEquivalentTo(new[] { _primary });
}
public void PrimaryPreferred_should_select_the_secondaries_when_no_primary_exists_when_tags_exist()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.PrimaryPreferred, new[] { new TagSet(new[] { new Tag("a", "2") }) }));
var result = subject.SelectServers(_description, new[] { _secondary1, _secondary2 }).ToList();
result.Should().BeEquivalentTo(new[] { _secondary2 });
}
public void Nearest_should_select_all_the_servers_respecting_tags()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Nearest, new[] { new TagSet(new[] { new Tag("a", "1") }) }));
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new [] { _primary, _secondary1 });
}
public void Secondary_should_select_a_secondary()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.Secondary);
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _secondary1, _secondary2 });
}
public void Primary_should_select_the_primary()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.Primary);
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _primary });
}
public void Nearest_should_select_all_the_servers()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.Nearest);
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(_description.Servers);
}
public void Secondary_should_select_a_secondary()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.Secondary);
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _secondary1, _secondary2 });
}
public void Primary_should_select_none_when_no_primary_exists()
{
var subject = new ReadPreferenceServerSelector(ReadPreference.Primary);
var result = subject.SelectServers(_description, new [] { _secondary1, _secondary2 }).ToList();
result.Should().BeEmpty();
}
public void PrimaryPreferred_should_select_the_primary_regardless_of_tags()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.PrimaryPreferred, new[] { new TagSet(new[] { new Tag("a", "2") }) }));
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _primary });
}
public void Nearest_should_select_all_the_servers_respecting_tags()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Nearest, new[] { new TagSet(new[] { new Tag("a", "1") }) }));
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new [] { _primary, _secondary1 });
}
public void PrimaryPreferred_should_select_the_primary_when_it_exists_regardless_of_tags()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.PrimaryPreferred, new[] { new TagSet(new[] { new Tag("a", "2") }) }));
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _primary });
}
public void Should_select_nothing_when_attempting_to_match_tags_and_servers_do_not_have_tags()
{
var clusterId = new ClusterId();
var primary = ServerDescriptionHelper.Connected(clusterId, new DnsEndPoint("localhost", 27017), ServerType.ReplicaSetPrimary);
var secondary = ServerDescriptionHelper.Connected(clusterId, new DnsEndPoint("localhost", 27018), ServerType.ReplicaSetSecondary);
var description = new ClusterDescription(
clusterId,
ClusterType.ReplicaSet,
new[] { primary, secondary });
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Secondary, new[] { new TagSet(new[] { new Tag("a", "1") }) }));
var result = subject.SelectServers(description, description.Servers).ToList();
result.Should().BeEmpty();
}
public void ReadPreference_should_be_ignored_when_directly_connected_with_a_server()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Primary));
var clusterId = new ClusterId();
var server = ServerDescriptionHelper.Connected(clusterId, new DnsEndPoint("localhost", 27018), ServerType.ReplicaSetSecondary);
var description = new ClusterDescription(
clusterId,
ClusterConnectionMode.Direct,
ClusterType.ReplicaSet,
new[] { server });
var result = subject.SelectServers(description, description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { server });
}
// methods
/// <inheritdoc/>
public IEnumerable <ServerDescription> SelectServers(ClusterDescription cluster, IEnumerable <ServerDescription> servers)
{
if (cluster.IsDirectConnection)
{
return(servers);
}
var serversList = servers.ToList(); // avoid multiple enumeration
if (CanUseSecondaries(cluster, serversList))
{
var readPreferenceSelector = new ReadPreferenceServerSelector(_mayUseSecondary.ReadPreference);
return(readPreferenceSelector.SelectServers(cluster, serversList));
}
if (_mayUseSecondary != null)
{
_mayUseSecondary.EffectiveReadPreference = ReadPreference.Primary; // fallback to primary
}
return(serversList.Where(x => x.Type.IsWritable()));
}
private async Task<IReadBindingHandle> GetSingleServerReadBindingAsync(CancellationToken cancellationToken)
{
var readPreference = _options.ReadPreference ?? _database.Settings.ReadPreference;
var selector = new ReadPreferenceServerSelector(readPreference);
var server = await _cluster.SelectServerAsync(selector, cancellationToken).ConfigureAwait(false);
var binding = new SingleServerReadBinding(server, readPreference);
return new ReadBindingHandle(binding);
}
public void Secondary_should_select_only_secondaries_when_they_match_the_tags()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Secondary, new[] { new TagSet(new[] { new Tag("a", "1") }) }));
var result = subject.SelectServers(_description, _description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { _secondary1 });
}
public void Should_select_nothing_when_attempting_to_match_tags_and_servers_do_not_have_tags()
{
var clusterId = new ClusterId();
var primary = ServerDescriptionHelper.Connected(clusterId, new DnsEndPoint("localhost", 27017), ServerType.ReplicaSetPrimary);
var secondary = ServerDescriptionHelper.Connected(clusterId, new DnsEndPoint("localhost", 27018), ServerType.ReplicaSetSecondary);
var description = new ClusterDescription(
clusterId,
ClusterType.ReplicaSet,
new[] { primary, secondary });
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Secondary, new[] { new TagSet(new[] { new Tag("a", "1") }) }));
var result = subject.SelectServers(description, description.Servers).ToList();
result.Should().BeEmpty();
}
public void PrimaryPreferred_should_select_the_secondaries_when_no_primary_exists_when_tags_exist()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.PrimaryPreferred, new[] { new TagSet(new[] { new Tag("a", "2") }) }));
var result = subject.SelectServers(_description, new[] { _secondary1, _secondary2 }).ToList();
result.Should().BeEquivalentTo(new[] { _secondary2 });
}
public void ReadPreference_should_be_ignored_when_directly_connected_with_a_server()
{
var subject = new ReadPreferenceServerSelector(new ReadPreference(ReadPreferenceMode.Primary));
var clusterId = new ClusterId();
var server = ServerDescriptionHelper.Connected(clusterId, new DnsEndPoint("localhost", 27018), ServerType.ReplicaSetSecondary);
var description = new ClusterDescription(
clusterId,
ClusterConnectionMode.Direct,
ClusterType.ReplicaSet,
new[] { server });
var result = subject.SelectServers(description, description.Servers).ToList();
result.Should().BeEquivalentTo(new[] { server });
}
private IReadBindingHandle GetSingleServerReadBinding(CancellationToken cancellationToken)
{
var readPreference = _options.ReadPreference ?? _database.Settings.ReadPreference;
var selector = new ReadPreferenceServerSelector(readPreference);
var server = _cluster.SelectServer(selector, cancellationToken);
var binding = new SingleServerReadBinding(server, readPreference);
return new ReadBindingHandle(binding);
}