discard some parameters (#6751)

Co-authored-by: Aaron Stannard <aaron@petabridge.com>

src/benchmark/Akka.Benchmarks/Cluster/ReachabilityBenchmarks.cs

@@ -48,7 +48,7 @@ private Reachability AddUnreachable(Reachability baseReachability, int count)
             using var subjects = baseReachability.Versions.Keys.ToList().GetContinuousEnumerator();
             return observers.Aggregate(baseReachability, (r, o) =>
             {
-                return Enumerable.Range(1, 5).Aggregate(r, (r2, i) =>
+                return Enumerable.Range(1, 5).Aggregate(r, (r2, _) =>
                 {
                     subjects.MoveNext();
                     return r2.Unreachable(o, subjects.Current);

src/benchmark/Akka.Benchmarks/IO/TcpOperationsBenchmarks.cs

@@ -83,7 +83,7 @@ public EchoServer(int port)
                 Context.System.Tcp().Tell(new Tcp.Bind(Self, new IPEndPoint(IPAddress.Any, port)));
 
                 Receive<Tcp.Bound>(_ => { });
-                Receive<Tcp.Connected>(connected =>
+                Receive<Tcp.Connected>(_ =>
                 {
                     var connection = Context.ActorOf(Props.Create(() => new EchoConnection(Sender)));
                     Sender.Tell(new Tcp.Register(connection));

src/benchmark/Akka.Benchmarks/Remoting/AkkaPduCodecBenchmark.cs

@@ -64,10 +64,10 @@ public async Task Setup()
             _addr2 = RARP.For(_sys2).Provider.DefaultAddress;
 
             _senderActorRef =
-                _sys2.ActorOf(act => { act.ReceiveAny((o, context) => context.Sender.Tell(context.Sender)); },
+                _sys2.ActorOf(act => { act.ReceiveAny((_, context) => context.Sender.Tell(context.Sender)); },
                     "sender1");
 
-            _localReceiveRef = _sys1.ActorOf(act => { act.ReceiveAny((o, context) => context.Sender.Tell(context.Sender)); },
+            _localReceiveRef = _sys1.ActorOf(act => { act.ReceiveAny((_, context) => context.Sender.Tell(context.Sender)); },
                 "recv1");
 
             // create an association

src/benchmark/Akka.Benchmarks/Remoting/LruBoundedCacheBenchmarks.cs

@@ -54,7 +54,7 @@ public async Task Setup()
             var name = "target" + ++_cacheHitPathCount;
             _cacheHitActorRef = _sys1.ActorOf(act =>
             {
-                act.ReceiveAny((o, context) => context.Sender.Tell(context.Sender));
+                act.ReceiveAny((_, context) => context.Sender.Tell(context.Sender));
             }, name);
 
             _cacheMissActorRef = await _cacheHitActorRef.Ask<IActorRef>("hit", CancellationToken.None);

src/benchmark/Akka.Benchmarks/Streams/MaterializationBenchmarks.cs

@@ -30,7 +30,7 @@ public void Setup()
 
             simpleGraph = Source.Single(1)
                 .Select(x => x + 1)
-                .ToMaterialized(Sink.ForEach<int>(i => { }), Keep.Right);
+                .ToMaterialized(Sink.ForEach<int>(_ => { }), Keep.Right);
         }
 
         [GlobalCleanup]

src/benchmark/Akka.Cluster.Benchmarks/Persistence/PersistenceInfrastructure.cs

@@ -92,14 +92,14 @@ public BenchmarkDoneActor(int expected)
                 _asker = Sender;
             });
 
-            Receive<Finished>(f =>
+            Receive<Finished>(_ =>
             {
                 // this will terminate the benchmark
                 if(--_expected <= 0)
                     _asker.Tell(Done.Instance);
             });
 
-            Receive<RecoveryFinished>(f =>
+            Receive<RecoveryFinished>(_ =>
             {
                 // this will terminate the benchmark
                 if (--_expected <= 0)

src/benchmark/Akka.Cluster.Benchmarks/Sharding/ShardingInfrastructure.cs

@@ -89,7 +89,7 @@ public void WaitResult()
                 Become(WaitRequest);
             });
 
-            ReceiveAny(msg =>
+            ReceiveAny(_ =>
                 Stash.Stash()
             );
 
@@ -260,7 +260,7 @@ public static IActorRef StartShardRegion(ActorSystem system, string entityName =
         {
             var props = Props.Create(() => new ShardedEntityActor());
             var sharding = ClusterSharding.Get(system);
-            return sharding.Start(entityName, s => props, ClusterShardingSettings.Create(system),
+            return sharding.Start(entityName, _ => props, ClusterShardingSettings.Create(system),
                 new ShardMessageExtractor());
         }
     }

src/benchmark/PingPong/ClientAsyncActor.cs

@@ -32,7 +32,7 @@ public ClientAsyncActor(IActorRef actor, long repeat, TaskCompletionSource<bool>
                     latch.SetResult(true);
                 }
             });
-            Receive<Messages.Run>(r =>
+            Receive<Messages.Run>(_ =>
             {
                 var msg = new Messages.Msg();
                 for (int i = 0; i < Math.Min(1000, repeat); i++)

src/benchmark/PingPong/ClientReceiveActor.cs

@@ -30,7 +30,7 @@ public ClientReceiveActor(IActorRef actor, long repeat, TaskCompletionSource<boo
                     latch.SetResult(true);
                 }
             });
-            Receive<Messages.Run>(r =>
+            Receive<Messages.Run>(_ =>
             {
                 var msg = new Messages.Msg();
                 for(int i = 0; i < Math.Min(1000, repeat); i++)

src/benchmark/SerializationBenchmarks/Program.cs

@@ -93,13 +93,13 @@ public void NoPooling()
         public void Pooling_MultiTasks()
         {
             Task.WaitAll(Enumerable.Repeat(0, 10)
-                .Select((l) => Task.Run(Pooling)).ToArray());
+                .Select((_) => Task.Run(Pooling)).ToArray());
         }
         [Benchmark]
         public void NoPooling_MultiTasks()
         {
             Task.WaitAll(Enumerable.Repeat(0, 10)
-                .Select((l) => Task.Run(NoPooling)).ToArray());
+                .Select((_) => Task.Run(NoPooling)).ToArray());
         }
     }
 

src/contrib/cluster/Akka.Cluster.Metrics.Tests.MultiNode/ClustetMetricsRoutingSpec.cs

@@ -350,7 +350,7 @@ private Address FullAddress(IActorRef actorRef)
 
         private IImmutableDictionary<Address, int> ReceiveReplies(int expectedReplies)
         {
-            var zero = ImmutableDictionary<Address, int>.Empty.AddRange(Roles.ToDictionary(r => Node(r).Address, r => 0));
+            var zero = ImmutableDictionary<Address, int>.Empty.AddRange(Roles.ToDictionary(r => Node(r).Address, _ => 0));
             return ReceiveWhile(5.Seconds(), msg => (msg as AdaptiveLoadBalancingRouterConfig.Reply)?.Address, expectedReplies)
                 .Aggregate(zero, (replyDict, address) => replyDict.SetItem(address, replyDict[address] + 1));
         }

src/contrib/cluster/Akka.Cluster.Sharding.Tests.MultiNode/AsyncWriteProxyEx.cs

@@ -177,14 +177,14 @@ protected override Task<IImmutableList<Exception>> WriteMessagesAsync(IEnumerabl
                 .ContinueWith(r =>
                 {
                     if (r.IsCanceled)
-                        return (IImmutableList<Exception>)trueMsgs.Select(i => (Exception)new TimeoutException()).ToImmutableList();
+                        return (IImmutableList<Exception>)trueMsgs.Select(_ => (Exception)new TimeoutException()).ToImmutableList();
                     if (r.IsFaulted)
-                        return trueMsgs.Select(i => (Exception)r.Exception).ToImmutableList();
+                        return trueMsgs.Select(_ => (Exception)r.Exception).ToImmutableList();
 
                     return r.Result switch
                     {
-                        WriteMessageSuccess wms => trueMsgs.Select(i => (Exception)null).ToImmutableList(),
-                        WriteMessageFailure wmf => trueMsgs.Select(i => wmf.Cause).ToImmutableList(),
+                        WriteMessageSuccess wms => trueMsgs.Select(_ => (Exception)null).ToImmutableList(),
+                        WriteMessageFailure wmf => trueMsgs.Select(_ => wmf.Cause).ToImmutableList(),
                         _ => null
                     };
                 }, TaskContinuationOptions.ExecuteSynchronously);

src/contrib/cluster/Akka.Cluster.Sharding.Tests.MultiNode/ClusterShardingSpec.cs

@@ -703,7 +703,7 @@ private void ClusterSharding_should_failover_shards_on_crashed_node()
             {
                 // mute logging of deadLetters during shutdown of systems
                 if (!Log.IsDebugEnabled)
-                    Sys.EventStream.Publish(new Mute(new DeadLettersFilter(new PredicateMatcher(x => true), new PredicateMatcher(x => true))));
+                    Sys.EventStream.Publish(new Mute(new DeadLettersFilter(new PredicateMatcher(_ => true), new PredicateMatcher(_ => true))));
                 EnterBarrier("logs-muted");
 
                 RunOn(() =>

src/contrib/cluster/Akka.Cluster.Sharding.Tests/Delivery/DurableShardingSpec.cs

@@ -61,7 +61,7 @@ public async Task ReliableDelivery_with_sharding_and_durable_queue_must_load_ini
 
         // <SpawnDurableConsumer>
         var consumerProbe = CreateTestProbe();
-        var sharding = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var sharding = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         Props.Create(() => new Consumer(c, consumerProbe)),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -169,7 +169,7 @@ public async Task ReliableDelivery_with_sharding_and_durable_queue_must_reply_to
         NextId();
 
         var consumerProbe = CreateTestProbe();
-        var sharding = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var sharding = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         Props.Create(() => new Consumer(c, consumerProbe)),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -221,7 +221,7 @@ public Consumer(IActorRef consumerController, TestProbe consumerProbe)
             _deliveryAdapter = Context.ActorOf(
                 act =>
                 {
-                    act.Receive<ConsumerController.Delivery<Job>>((delivery, ctx) =>
+                    act.Receive<ConsumerController.Delivery<Job>>((delivery, _) =>
                     {
                         self.Forward(new JobDelivery(delivery.Message, delivery.ConfirmTo, delivery.ProducerId,
                             delivery.SeqNr));

src/contrib/cluster/Akka.Cluster.Sharding.Tests/Delivery/ReliableDeliveryShardingSpec.cs

@@ -61,7 +61,7 @@ public async Task ReliableDelivery_with_Sharding_must_illustrate_Sharding_usage(
         NextId();
 
         var consumerEndProbe = CreateTestProbe();
-        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         PropsFor(DefaultConsumerDelay, 42, consumerEndProbe.Ref, c),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -96,7 +96,7 @@ public async Task ReliableDelivery_with_Sharding_must_illustrate_Sharding_usage_
         NextId();
 
         var consumerEndProbe = CreateTestProbe();
-        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         PropsFor(DefaultConsumerDelay, 42, consumerEndProbe.Ref, c),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -144,7 +144,7 @@ public async Task ReliableDelivery_with_Sharding_must_reply_to_MessageWithConfir
         NextId();
 
         var consumerEndProbe = CreateTestProbe();
-        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         PropsFor(DefaultConsumerDelay, 3, consumerEndProbe.Ref, c),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -335,9 +335,9 @@ public async Task
         NextId();
 
         var consumerIncarnation = new AtomicCounter(0);
-        var consumerProbes = Enumerable.Range(0, 3).Select(c => CreateTestProbe()).ToList();
+        var consumerProbes = Enumerable.Range(0, 3).Select(_ => CreateTestProbe()).ToList();
 
-        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         Props.Create(() => new ProbeWrapper(consumerProbes[consumerIncarnation.GetAndIncrement()], c)),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -430,7 +430,7 @@ public async Task
         NextId();
 
         var consumerEndProbe = CreateTestProbe();
-        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         Props.Create(() => new ProbeWrapper(consumerEndProbe, c)),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -507,7 +507,7 @@ public async Task
         NextId();
 
         var consumerEndProbe = CreateTestProbe();
-        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", s =>
+        var region = await ClusterSharding.Get(Sys).StartAsync($"TestConsumer-{_idCount}", _ =>
                 ShardingConsumerController.Create<Job>(c =>
                         Props.Create(() => new ProbeWrapper(consumerEndProbe, c)),
                     ShardingConsumerController.Settings.Create(Sys)), ClusterShardingSettings.Create(Sys),
@@ -650,7 +650,7 @@ private void Active(int n, IActorRef sendTo)
                 Become(() => Idle(n));
             });
 
-            Receive<RequestNext>(next => { }); // already active
+            Receive<RequestNext>(_ => { }); // already active
         }
 
         public sealed class Tick

src/contrib/cluster/Akka.Cluster.Sharding.Tests/Internal/RememberEntitiesStarterSpec.cs

@@ -58,7 +58,7 @@ public void RememberEntitiesStarter_must_try_start_all_entities_directly_with_en
                 RememberEntityStarter.Props(regionProbe.Ref, shardProbe.Ref, shardId, ImmutableHashSet.Create("1", "2", "3"), defaultSettings));
 
             Watch(rememberEntityStarter);
-            var startedEntityIds = Enumerable.Range(1, 3).Select(i =>
+            var startedEntityIds = Enumerable.Range(1, 3).Select(_ =>
             {
                 var start = regionProbe.ExpectMsg<ShardRegion.StartEntity>();
                 regionProbe.LastSender.Tell(new ShardRegion.StartEntityAck(start.EntityId, shardId));
@@ -95,7 +95,7 @@ public void RememberEntitiesStarter_must_retry_start_all_entities_with_no_ack_wi
             {
                 var start = regionProbe.ExpectMsg<ShardRegion.StartEntity>();
             }
-            var startedOnSecondTry = Enumerable.Range(1, 3).Select(i =>
+            var startedOnSecondTry = Enumerable.Range(1, 3).Select(_ =>
              {
                  var start = regionProbe.ExpectMsg<ShardRegion.StartEntity>();
                  regionProbe.LastSender.Tell(new ShardRegion.StartEntityAck(start.EntityId, shardId));

src/contrib/cluster/Akka.Cluster.Sharding.Tests/LeastShardAllocationStrategyRandomizedSpec.cs

@@ -64,7 +64,7 @@ private void TestRebalance(
                 var regions = Enumerable.Range(1, numberOfRegions).Select(n => LeastShardAllocationStrategySpec.NewFakeRegion($"{iteration}-R{n}", memberArray[n - 1]));
 
                 //var regions = Enumerable.Range(1, numberOfRegions).Select(n => Sys.ActorOf(Props.Empty, $"{iteration}-R{n}")).ToImmutableList();
-                var countPerRegion = regions.ToImmutableDictionary(region => region, region => rnd.Next(maxShardsPerRegion));
+                var countPerRegion = regions.ToImmutableDictionary(region => region, _ => rnd.Next(maxShardsPerRegion));
                 var allocations = CreateAllocations(countPerRegion);
                 TestRebalance(allocationStrategy, allocations, ImmutableList.Create(allocations), expectedMaxSteps);
                 foreach (var region in regions)

src/contrib/cluster/Akka.Cluster.Sharding.Tests/PersistentShardingMigrationSpec.cs

@@ -169,7 +169,7 @@ public void Migration_should_allow_migration_of_remembered_shards_and_not_allow_
         {
             var typeName = "Migration";
 
-            WithSystem(Sys.Settings.Config, typeName, "OldMode", (s, region, p) =>
+            WithSystem(Sys.Settings.Config, typeName, "OldMode", (_, region, _) =>
             {
                 AssertRegionRegistrationComplete(region);
                 region.Tell(new Message(1));

src/contrib/cluster/Akka.Cluster.Sharding.Tests/ShardRegionQueriesHashCodeSpecs.cs

@@ -47,7 +47,7 @@ public ShardRegionQueriesHashCodeSpecs(ITestOutputHelper outputHelper) : base(Ge
         {
             _clusterSharding = ClusterSharding.Get(Sys);
             _cluster = Cluster.Get(Sys);
-            _shardRegion = _clusterSharding.Start("entity", s => EchoActor.Props(this, true),
+            _shardRegion = _clusterSharding.Start("entity", _ => EchoActor.Props(this, true),
                 ClusterShardingSettings.Create(Sys).WithRole("shard"), new MessageExtractor());
 
             var proxySysConfig = ConfigurationFactory.ParseString("akka.cluster.roles = [proxy]")

src/contrib/cluster/Akka.Cluster.Sharding.Tests/ShardRegionQueriesSpecs.cs

@@ -31,7 +31,7 @@ public ShardRegionQueriesSpecs(ITestOutputHelper outputHelper) : base(GetConfig(
         {
             _clusterSharding = ClusterSharding.Get(Sys);
             _cluster = Cluster.Get(Sys);
-            _shardRegion = _clusterSharding.Start("entity", s => EchoActor.Props(this, true),
+            _shardRegion = _clusterSharding.Start("entity", _ => EchoActor.Props(this, true),
                 ClusterShardingSettings.Create(Sys).WithRole("shard"), ExtractEntityId, ExtractShardId);
 
             var proxySysConfig = ConfigurationFactory.ParseString("akka.cluster.roles = [proxy]")

src/contrib/cluster/Akka.Cluster.Sharding/Delivery/Internal/ShardingConsumerControllerImpl.cs

@@ -62,9 +62,9 @@ private void WaitForStart()
             Stash.UnstashAll();
         });
 
-        Receive<ConsumerController.IConsumerCommand<T>>(command => { Stash.Stash(); });
+        Receive<ConsumerController.IConsumerCommand<T>>(_ => { Stash.Stash(); });
 
-        Receive<Terminated>(t =>
+        Receive<Terminated>(_ =>
         {
             _log.Debug("Consumer terminated before initialized.");
             Context.Stop(Self);
@@ -94,7 +94,7 @@ private void Active()
             }
         });
 
-        Receive<Terminated>(t => t.ActorRef.Equals(_consumer), terminated =>
+        Receive<Terminated>(t => t.ActorRef.Equals(_consumer), _ =>
         {
             _log.Debug("Consumer terminated.");
             Context.Stop(Self);

src/contrib/cluster/Akka.Cluster.Sharding/Delivery/Internal/ShardingProducerControllerImpl.cs

@@ -65,7 +65,7 @@ protected override void PreStart()
             Context.ActorOf(
                 act =>
                 {
-                    act.Receive<ProducerController.RequestNext<T>>((msg, ctx) =>
+                    act.Receive<ProducerController.RequestNext<T>>((msg, _) =>
                     {
                         self.Forward(new WrappedRequestNext<T>(msg));
                     });
@@ -153,7 +153,7 @@ private void BecomeActive(IActorRef producer, Option<DurableProducerQueue.State<
         var self = Self;
         MsgAdapter = Context.ActorOf(act =>
         {
-            act.Receive<ShardingEnvelope>((msg, ctx) => { self.Forward(new Msg(msg, 0)); });
+            act.Receive<ShardingEnvelope>((msg, _) => { self.Forward(new Msg(msg, 0)); });
 
             act.ReceiveAny((_, ctx) =>
             {
@@ -533,8 +533,8 @@ private void StoreMessageSent(DurableProducerQueue.MessageSent<T> messageSent, i
 
         DurableQueueRef.Value.Ask<DurableProducerQueue.StoreMessageSentAck>(Mapper,
                 askTimeout, cancellationToken: default)
-            .PipeTo(self, success: ack => new StoreMessageSentCompleted<T>(messageSent),
-                failure: ex => new StoreMessageSentFailed<T>(messageSent, attempt));
+            .PipeTo(self, success: _ => new StoreMessageSentCompleted<T>(messageSent),
+                failure: _ => new StoreMessageSentFailed<T>(messageSent, attempt));
     }
 
     private RequestNext<T> CreateRequestNext(State<T> state)
@@ -600,7 +600,7 @@ private void AskLoadState(Option<IActorRef> durableProducerQueue, int attempt)
             var self = Self;
             @ref.Ask<DurableProducerQueue.State<T>>(Mapper, timeout: loadTimeout, cancellationToken: default)
                 .PipeTo(self, success: state => new LoadStateReply<T>(state),
-                    failure: ex => new LoadStateFailed(attempt)); // timeout
+                    failure: _ => new LoadStateFailed(attempt)); // timeout
         });
     }