public OnDemandClientChannelFactory(IEstablishedClientChannelBuilder channelBuilder)
{
if (channelBuilder == null)
{
throw new ArgumentNullException(nameof(channelBuilder));
}
ChannelBuilder = channelBuilder;
}
private IOnDemandClientChannel CreateOnDemandClientChannel(IEstablishedClientChannelBuilder establishedClientChannelBuilder)
{
IOnDemandClientChannel onDemandClientChannel;
// Avoid the overhead of the MultiplexerClientChannel for a single connection
if (ChannelCount == 1)
{
onDemandClientChannel = new OnDemandClientChannel(establishedClientChannelBuilder);
}
else
{
onDemandClientChannel = new MultiplexerClientChannel(establishedClientChannelBuilder, ChannelCount);
}
return(onDemandClientChannel);
}
/// <summary>
/// Initializes a new instance of the <see cref="OnDemandClientChannel"/> class.
/// </summary>
/// <param name="builder">The builder.</param>
/// <exception cref="System.ArgumentNullException"></exception>
public OnDemandClientChannel(IEstablishedClientChannelBuilder builder)
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
if (builder.ChannelBuilder == null)
{
throw new ArgumentException("The specified builder is invalid", nameof(builder));
}
_builder = builder;
_semaphore = new SemaphoreSlim(1, 1);
ChannelCreatedHandlers = new List <Func <ChannelInformation, Task> >();
ChannelDiscardedHandlers = new List <Func <ChannelInformation, Task> >();
ChannelCreationFailedHandlers = new List <Func <FailedChannelInformation, Task <bool> > >();
ChannelOperationFailedHandlers = new List <Func <FailedChannelInformation, Task <bool> > >();
}
/// <summary>
/// Initializes a new instance of the <see cref="MultiplexerClientChannel"/> class.
/// </summary>
/// <param name="builder">The channel builder.</param>
/// <param name="count">The number of channels to create.</param>
/// <param name="inputBufferSize">The input buffer bounded capacity.</param>
/// <param name="outputBufferSize">The output buffer bounded capacity.</param>
/// <param name="channelCommandProcessor">The workflow for processing commands.</param>
/// <exception cref="System.ArgumentNullException"></exception>
/// <exception cref="System.ArgumentOutOfRangeException"></exception>
public MultiplexerClientChannel(
IEstablishedClientChannelBuilder builder,
int count = 5,
int inputBufferSize = 1,
int outputBufferSize = 1,
IChannelCommandProcessor channelCommandProcessor = null)
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
if (count <= 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
// Create observable collections to allow synchronization
var channelCreatedHandlers = new ObservableCollection <Func <ChannelInformation, Task> >();
var channelDiscardedHandlers = new ObservableCollection <Func <ChannelInformation, Task> >();
var channelCreationFailedHandlers = new ObservableCollection <Func <FailedChannelInformation, Task <bool> > >();
var channelOperationFailedHandlers = new ObservableCollection <Func <FailedChannelInformation, Task <bool> > >();
ChannelCreatedHandlers = channelCreatedHandlers;
ChannelDiscardedHandlers = channelDiscardedHandlers;
ChannelCreationFailedHandlers = channelCreationFailedHandlers;
ChannelOperationFailedHandlers = channelOperationFailedHandlers;
// Global input buffers
var inputOptions = new ExecutionDataflowBlockOptions()
{
BoundedCapacity = inputBufferSize,
MaxDegreeOfParallelism = DataflowBlockOptions.Unbounded,
EnsureOrdered = false
};
_inputMessageBufferBlock = new BufferBlock <Message>(inputOptions);
_inputNotificationBufferBlock = new BufferBlock <Notification>(inputOptions);
_channelCommandProcessor = channelCommandProcessor ?? new ChannelCommandProcessor();
// Uses the same channel command processor for all instances
// to avoid problems with commands responses being received on different channels.
builder.ChannelBuilder.WithChannelCommandProcessor(_channelCommandProcessor);
_processCommandTransformBlock = new TransformBlock <Command, Command>(c =>
{
if (_channelCommandProcessor.TrySubmitCommandResult(c))
{
return(null);
}
return(c);
},
inputOptions);
_inputCommandBufferBlock = new BufferBlock <Command>(inputOptions);
_processCommandTransformBlock.LinkTo(_inputCommandBufferBlock, c => c != null);
_processCommandTransformBlock.LinkTo(DataflowBlock.NullTarget <Command>(), c => c == null);
// The global output buffer
_outputBufferBlock = new BufferBlock <BufferedEnvelope>(new DataflowBlockOptions()
{
BoundedCapacity = outputBufferSize,
EnsureOrdered = false
});
// An output action block per channel
_outputActionBlocks = new ActionBlock <BufferedEnvelope> [count];
_channels = new IOnDemandClientChannel[count];
_listeners = new IChannelListener[count];
for (var i = 0; i < _channels.Length; i++)
{
// Add an instance suffix to the builder
var currentBuilder = builder
.Copy()
.WithInstance($"{builder.Instance}-{i+1}");
var channel = new OnDemandClientChannel(currentBuilder);
// Synchronize the handlers
AttachCollection(channelCreatedHandlers, channel.ChannelCreatedHandlers);
AttachCollection(channelDiscardedHandlers, channel.ChannelDiscardedHandlers);
AttachCollection(channelCreationFailedHandlers, channel.ChannelCreationFailedHandlers);
AttachCollection(channelOperationFailedHandlers, channel.ChannelOperationFailedHandlers);
// Setup the listener for the channel
_listeners[i] = new DataflowChannelListener(
_inputMessageBufferBlock,
_inputNotificationBufferBlock,
_processCommandTransformBlock);
// Create a single bounded action block for each channel
_outputActionBlocks[i] = new ActionBlock <BufferedEnvelope>(
async e => await SendToChannelAsync(channel, e.Envelope).ConfigureAwait(false),
new ExecutionDataflowBlockOptions()
{
BoundedCapacity = 1, MaxDegreeOfParallelism = 1
});
var channelId = i;
_outputBufferBlock.LinkTo(
_outputActionBlocks[i],
new DataflowLinkOptions()
{
PropagateCompletion = true
},
e => e.ChannelId == channelId);
_channels[i] = channel;
}
_semaphore = new SemaphoreSlim(1, 1);
}
private void SubstituteEstablishedClientChannelBuilder()
{
EstablishedClientChannelBuilder = Substitute.For <IEstablishedClientChannelBuilder>();
}
