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/*
* Licensed 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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace DotPulsar.Internal
{
using Abstractions;
using Events;
using System;
using System.Threading;
using System.Threading.Tasks;
public sealed class ProducerProcess : Process
{
private readonly IStateManager<ProducerState> _stateManager;
private readonly IEstablishNewChannel _producer;
// The following variables are only used when this is the process for parent producer.
private readonly IRegisterEvent _processManager;
private int _partitionsCount;
private int _connectedProducersCount;
private int _initialProducersCount;
// The following variables are only used for sub producer
private readonly Guid? _partitionedProducerId;
public ProducerProcess(
Guid correlationId,
IStateManager<ProducerState> stateManager,
IEstablishNewChannel producer,
IRegisterEvent processManager,
Guid? partitionedProducerId = null) : base(correlationId)
{
_stateManager = stateManager;
_producer = producer;
_processManager = processManager;
_partitionedProducerId = partitionedProducerId;
}
public override async ValueTask DisposeAsync()
{
SetState(ProducerState.Closed);
CancellationTokenSource.Cancel();
await _producer.DisposeAsync().ConfigureAwait(false);
}
protected override void HandleExtend(IEvent e)
{
switch (e)
{
case PartitionedSubProducerStateChanged stateChanged:
switch (stateChanged.ProducerState)
{
case ProducerState.Closed:
_stateManager.SetState(ProducerState.Closed);
break;
case ProducerState.Connected:
Interlocked.Increment(ref _connectedProducersCount);
break;
case ProducerState.Disconnected:
// When the sub producer is initialized, the Disconnected event will be triggered.
// So we need to first subtract from _initialProducersCount.
if (_initialProducersCount == 0)
Interlocked.Decrement(ref _connectedProducersCount);
else
Interlocked.Decrement(ref _initialProducersCount);
break;
case ProducerState.Faulted:
_stateManager.SetState(ProducerState.Faulted);
break;
case ProducerState.PartiallyConnected: break;
default: throw new ArgumentOutOfRangeException();
}
break;
case UpdatePartitions updatePartitions:
if (updatePartitions.PartitionsCount == 0)
{
Interlocked.Exchange(ref _initialProducersCount, 1);
Interlocked.Exchange(ref _partitionsCount, 1);
}
else
{
Interlocked.Add(ref _initialProducersCount, (int) updatePartitions.PartitionsCount - _partitionsCount);
Interlocked.Exchange(ref _partitionsCount, (int) updatePartitions.PartitionsCount);
}
break;
}
}
protected override void CalculateState()
{
if (_stateManager.IsFinalState())
return;
if (!IsSubProducer()) // parent producer process
{
if (_connectedProducersCount <= 0)
_stateManager.SetState(ProducerState.Disconnected);
else if (_connectedProducersCount == _partitionsCount)
_stateManager.SetState(ProducerState.Connected);
else
_stateManager.SetState(ProducerState.PartiallyConnected);
if (_partitionsCount == 0)
_ = _producer.EstablishNewChannel(CancellationTokenSource.Token);
return;
}
if (ExecutorState == ExecutorState.Faulted)
{
SetState(ProducerState.Faulted);
return;
}
switch (ChannelState)
{
case ChannelState.ClosedByServer:
case ChannelState.Disconnected:
SetState(ProducerState.Disconnected);
_ = _producer.EstablishNewChannel(CancellationTokenSource.Token);
return;
case ChannelState.Connected:
SetState(ProducerState.Connected);
return;
}
}
/// <summary>
/// Check if this is the sub producer process of the partitioned producer.
/// </summary>
private bool IsSubProducer()
=> _partitionedProducerId.HasValue;
private void SetState(ProducerState state)
{
_stateManager.SetState(state);
if (IsSubProducer())
_processManager.Register(new PartitionedSubProducerStateChanged(_partitionedProducerId!.Value, state));
}
}
}