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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 DotPulsar.Abstractions;
using DotPulsar.Exceptions;
public sealed class ReaderBuilder<TMessage> : IReaderBuilder<TMessage>
{
private readonly IPulsarClient _pulsarClient;
private readonly ISchema<TMessage> _schema;
private string? _readerName;
private uint _messagePrefetchCount;
private bool _readCompacted;
private MessageId? _startMessageId;
private string? _topic;
private IHandleStateChanged<ReaderStateChanged>? _stateChangedHandler;
public ReaderBuilder(IPulsarClient pulsarClient, ISchema<TMessage> schema)
{
_pulsarClient = pulsarClient;
_schema = schema;
_messagePrefetchCount = ReaderOptions<TMessage>.DefaultMessagePrefetchCount;
_readCompacted = ReaderOptions<TMessage>.DefaultReadCompacted;
}
public IReaderBuilder<TMessage> MessagePrefetchCount(uint count)
{
_messagePrefetchCount = count;
return this;
}
public IReaderBuilder<TMessage> ReadCompacted(bool readCompacted)
{
_readCompacted = readCompacted;
return this;
}
public IReaderBuilder<TMessage> ReaderName(string name)
{
_readerName = name;
return this;
}
public IReaderBuilder<TMessage> StartMessageId(MessageId messageId)
{
_startMessageId = messageId;
return this;
}
public IReaderBuilder<TMessage> StateChangedHandler(IHandleStateChanged<ReaderStateChanged> handler)
{
_stateChangedHandler = handler;
return this;
}
public IReaderBuilder<TMessage> Topic(string topic)
{
_topic = topic;
return this;
}
public IReader<TMessage> Create()
{
if (_startMessageId is null)
throw new ConfigurationException("StartMessageId may not be null");
if (string.IsNullOrEmpty(_topic))
throw new ConfigurationException("Topic may not be null or empty");
var options = new ReaderOptions<TMessage>(_startMessageId, _topic!, _schema)
{
MessagePrefetchCount = _messagePrefetchCount,
ReadCompacted = _readCompacted,
ReaderName = _readerName,
StateChangedHandler = _stateChangedHandler
};
return _pulsarClient.CreateReader(options);
}
}
}