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// Copyright (c) ZeroC, Inc. All rights reserved.
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace ZeroC.Ice.Discovery
{
/// <summary>Servant class that implements the Slice interface Ice::LocatorRegistry.</summary>
internal class LocatorRegistry : IAsyncLocatorRegistry
{
private readonly IObjectPrx _dummyIce1Proxy;
private readonly IObjectPrx _dummyIce2Proxy;
private readonly Dictionary<string, IObjectPrx> _ice1Adapters = new();
private readonly Dictionary<string, IReadOnlyList<EndpointData>> _ice2Adapters = new();
private readonly object _mutex = new();
private readonly Dictionary<(string AdapterId, Protocol Protocol), HashSet<string>> _replicaGroups = new();
public ValueTask RegisterAdapterEndpointsAsync(
string adapterId,
string replicaGroupId,
EndpointData[] endpoints,
Current current,
CancellationToken cancel)
{
if (endpoints.Length == 0)
{
throw new InvalidArgumentException("endpoints cannot be empty", nameof(endpoints));
}
RegisterAdapterEndpoints(adapterId, replicaGroupId, Protocol.Ice2, endpoints, _ice2Adapters);
return default;
}
public ValueTask SetAdapterDirectProxyAsync(
string adapterId,
IObjectPrx? proxy,
Current current,
CancellationToken cancel) =>
SetReplicatedAdapterDirectProxyAsync(adapterId, "", proxy, current, cancel);
public ValueTask SetReplicatedAdapterDirectProxyAsync(
string adapterId,
string replicaGroupId,
IObjectPrx? proxy,
Current current,
CancellationToken cancel)
{
if (proxy != null)
{
RegisterAdapterEndpoints(adapterId, replicaGroupId, Protocol.Ice1, proxy, _ice1Adapters);
}
else
{
UnregisterAdapterEndpoints(adapterId, replicaGroupId, Protocol.Ice1, _ice1Adapters);
}
return default;
}
public ValueTask SetServerProcessProxyAsync(
string serverId,
IProcessPrx process,
Current current,
CancellationToken cancel) => default; // Ignored
public ValueTask UnregisterAdapterEndpointsAsync(
string adapterId,
string replicaGroupId,
Current current,
CancellationToken cancel)
{
UnregisterAdapterEndpoints(adapterId, replicaGroupId, Protocol.Ice2, _ice2Adapters);
return default;
}
internal LocatorRegistry(Communicator communicator)
{
_dummyIce1Proxy = IObjectPrx.Parse("dummy", communicator);
_dummyIce2Proxy = IObjectPrx.Parse("ice:dummy", communicator);
}
internal (IObjectPrx? Proxy, bool IsReplicaGroup) FindAdapter(string adapterId)
{
lock (_mutex)
{
if (_ice1Adapters.TryGetValue(adapterId, out IObjectPrx? proxy))
{
return (proxy, false);
}
if (_replicaGroups.TryGetValue((adapterId, Protocol.Ice1), out HashSet<string>? adapterIds))
{
Debug.Assert(adapterIds.Count > 0);
var endpoints = adapterIds.SelectMany(id => _ice1Adapters[id].Endpoints).ToList();
return (_dummyIce1Proxy.Clone(endpoints: endpoints), true);
}
return (null, false);
}
}
internal async ValueTask<IObjectPrx?> FindObjectAsync(
Identity identity,
string? facet,
CancellationToken cancel)
{
if (identity.Name.Length == 0)
{
return null;
}
List<string> candidates;
lock (_mutex)
{
// We check the local replica groups before the local adapters.
candidates =
_replicaGroups.Keys.Where(k => k.Protocol == Protocol.Ice1).Select(k => k.AdapterId).ToList();
candidates.AddRange(_ice1Adapters.Keys);
}
foreach (string id in candidates)
{
try
{
// This proxy is an indirect proxy with a location (the replica group ID or adapter ID).
IObjectPrx proxy = _dummyIce1Proxy.Clone(
IObjectPrx.Factory,
identity: identity,
facet: facet,
location: ImmutableArray.Create(id));
await proxy.IcePingAsync(cancel: cancel).ConfigureAwait(false);
return proxy;
}
catch
{
// Ignore and move on to the next replica group ID / adapter ID
}
}
return null;
}
internal (IReadOnlyList<EndpointData> Endpoints, bool IsReplicaGroup) ResolveAdapterId(string adapterId)
{
lock (_mutex)
{
if (_ice2Adapters.TryGetValue(adapterId, out IReadOnlyList<EndpointData>? endpoints))
{
return (endpoints, false);
}
if (_replicaGroups.TryGetValue((adapterId, Protocol.Ice2), out HashSet<string>? adapterIds))
{
Debug.Assert(adapterIds.Count > 0);
return (adapterIds.SelectMany(id => _ice2Adapters[id]).ToList(), true);
}
return (ImmutableArray<EndpointData>.Empty, false);
}
}
internal async ValueTask<string> ResolveWellKnownProxyAsync(
Identity identity,
string facet,
CancellationToken cancel)
{
if (identity.Name.Length == 0)
{
return "";
}
List<string> candidates;
lock (_mutex)
{
// We check the local replica groups before the local adapters.
candidates =
_replicaGroups.Keys.Where(k => k.Protocol == Protocol.Ice2).Select(k => k.AdapterId).ToList();
candidates.AddRange(_ice2Adapters.Keys);
}
foreach (string id in candidates)
{
try
{
// This proxy is an indirect proxy with a location (the replica group ID or adapter ID).
IObjectPrx proxy = _dummyIce2Proxy.Clone(
IObjectPrx.Factory,
identity: identity,
facet: facet,
location: ImmutableArray.Create(id));
await proxy.IcePingAsync(cancel: cancel).ConfigureAwait(false);
return id;
}
catch
{
// Ignore and move on to the next replica group ID / adapter ID
}
}
return "";
}
private void RegisterAdapterEndpoints<T>(
string adapterId,
string replicaGroupId,
Protocol protocol,
T endpoints,
Dictionary<string, T> adapters)
{
if (adapterId.Length == 0)
{
throw new InvalidArgumentException("adapterId cannot be empty", nameof(adapterId));
}
lock (_mutex)
{
adapters[adapterId] = endpoints;
if (replicaGroupId.Length > 0)
{
if (!_replicaGroups.TryGetValue((replicaGroupId, protocol), out HashSet<string>? adapterIds))
{
adapterIds = new();
_replicaGroups.Add((replicaGroupId, protocol), adapterIds);
}
adapterIds.Add(adapterId);
}
}
}
private void UnregisterAdapterEndpoints<T>(
string adapterId,
string replicaGroupId,
Protocol protocol,
Dictionary<string, T> adapters)
{
if (adapterId.Length == 0)
{
throw new InvalidArgumentException("adapterId cannot be empty", nameof(adapterId));
}
lock (_mutex)
{
adapters.Remove(adapterId);
if (replicaGroupId.Length > 0)
{
if (_replicaGroups.TryGetValue((replicaGroupId, protocol), out HashSet<string>? adapterIds))
{
adapterIds.Remove(adapterId);
if (adapterIds.Count == 0)
{
_replicaGroups.Remove((replicaGroupId, protocol));
}
}
}
}
}
}
}
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