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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 DotPulsar.Abstractions;
using DotPulsar.Exceptions;
using DotPulsar.Internal.PulsarApi;
using Events;
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
public sealed class Reader : IReader
{
private readonly Guid _correlationId;
private readonly IRegisterEvent _eventRegister;
private IReaderChannel _channel;
private readonly IExecute _executor;
private readonly IStateChanged<ReaderState> _state;
private int _isDisposed;
public string Topic { get; }
public Reader(
Guid correlationId,
string topic,
IRegisterEvent eventRegister,
IReaderChannel initialChannel,
IExecute executor,
IStateChanged<ReaderState> state)
{
_correlationId = correlationId;
Topic = topic;
_eventRegister = eventRegister;
_channel = initialChannel;
_executor = executor;
_state = state;
_isDisposed = 0;
_eventRegister.Register(new ReaderCreated(_correlationId, this));
}
public async ValueTask<ReaderStateChanged> StateChangedTo(ReaderState state, CancellationToken cancellationToken)
{
var newState = await _state.StateChangedTo(state, cancellationToken).ConfigureAwait(false);
return new ReaderStateChanged(this, newState);
}
public async ValueTask<ReaderStateChanged> StateChangedFrom(ReaderState state, CancellationToken cancellationToken)
{
var newState = await _state.StateChangedFrom(state, cancellationToken).ConfigureAwait(false);
return new ReaderStateChanged(this, newState);
}
public bool IsFinalState()
=> _state.IsFinalState();
public bool IsFinalState(ReaderState state)
=> _state.IsFinalState(state);
public async IAsyncEnumerable<Message> Messages([EnumeratorCancellation] CancellationToken cancellationToken)
{
ThrowIfDisposed();
while (!cancellationToken.IsCancellationRequested)
yield return await _executor.Execute(() => _channel.Receive(cancellationToken), cancellationToken).ConfigureAwait(false);
}
public async ValueTask Seek(MessageId messageId, CancellationToken cancellationToken)
{
ThrowIfDisposed();
var seek = new CommandSeek { MessageId = messageId.Data };
_ = await _executor.Execute(() => _channel.Send(seek, cancellationToken), cancellationToken).ConfigureAwait(false);
}
public async ValueTask Seek(ulong publishTime, CancellationToken cancellationToken)
{
ThrowIfDisposed();
var seek = new CommandSeek { MessagePublishTime = publishTime };
_ = await _executor.Execute(() => _channel.Send(seek, cancellationToken), cancellationToken).ConfigureAwait(false);
}
public async ValueTask Seek(DateTime publishTime, CancellationToken cancellationToken)
{
ThrowIfDisposed();
var seek = new CommandSeek { MessagePublishTime = (ulong) new DateTimeOffset(publishTime).ToUnixTimeMilliseconds() };
_ = await _executor.Execute(() => _channel.Send(seek, cancellationToken), cancellationToken).ConfigureAwait(false);
}
public async ValueTask Seek(DateTimeOffset publishTime, CancellationToken cancellationToken)
{
ThrowIfDisposed();
var seek = new CommandSeek { MessagePublishTime = (ulong) publishTime.ToUnixTimeMilliseconds() };
_ = await _executor.Execute(() => _channel.Send(seek, cancellationToken), cancellationToken).ConfigureAwait(false);
}
public async ValueTask DisposeAsync()
{
if (Interlocked.Exchange(ref _isDisposed, 1) != 0)
return;
_eventRegister.Register(new ReaderDisposed(_correlationId, this));
await _channel.DisposeAsync().ConfigureAwait(false);
}
internal async ValueTask SetChannel(IReaderChannel channel)
{
if (_isDisposed != 0)
{
await channel.DisposeAsync().ConfigureAwait(false);
return;
}
var oldChannel = _channel;
_channel = channel;
if (oldChannel is not null)
await oldChannel.DisposeAsync().ConfigureAwait(false);
}
private void ThrowIfDisposed()
{
if (_isDisposed != 0)
throw new ReaderDisposedException();
}
}
}