public Logger(params AbstractWriter[] writers)
{
Contract.Requires(writers != null);
Contract.Requires(writers.Length >= 1);
cts = new CancellationTokenSource();
bufferBlocks = new List <BufferBlock <LogItem> >();
writerBlocks = new List <ActionBlock <LogItem[]> >();
foreach (var writer in writers)
{
writer.Setup();
var bufferBlock = new BufferBlock <LogItem>(
new DataflowBlockOptions()
{
CancellationToken = cts.Token
});
var batchBlock = new BatchBlock <LogItem>(
writer.BatchSize,
new GroupingDataflowBlockOptions()
{
Greedy = true,
CancellationToken = cts.Token
});
var timer = new Timer(state => batchBlock.TriggerBatch());
var timeoutBlock = new TransformBlock <LogItem, LogItem>(
value =>
{
timer.Change((int)writer.Timeout.TotalMilliseconds,
Timeout.Infinite);
return(value);
},
new ExecutionDataflowBlockOptions()
{
CancellationToken = cts.Token,
SingleProducerConstrained = true
});
var writerBlock = new ActionBlock <LogItem[]>(
async logItems =>
{
await writer.WriteAsync(logItems);
},
new ExecutionDataflowBlockOptions()
{
MaxDegreeOfParallelism = 1,
CancellationToken = cts.Token,
SingleProducerConstrained = true
});
writerBlock.Completion.ContinueWith(task => writer.Teardown());
timeoutBlock.LinkTo(batchBlock);
bufferBlock.LinkTo(timeoutBlock);
batchBlock.LinkTo(writerBlock);
writerBlocks.Add(writerBlock);
bufferBlocks.Add(bufferBlock);
timeoutBlock.HandleCompletion(batchBlock);
bufferBlock.HandleCompletion(timeoutBlock);
batchBlock.HandleCompletion(writerBlock);
}
}
