private void copy_io_stream_async(CopyStreamItem item)
{
if (buffer_sync == null)
{
buffers_async = new StreamAsyncWriter();
buffers_async.WriteChunkCallback = new WriteChunk(write_chunk_finish_async);
buffers_async.PrepareBuffers(buffers_count, buffer_size);
}
int bytes_readed = 0;
bool continue_copy = true;
while (continue_copy)
{
StreamWriterBuffer buf = buffers_async.WaitForFreeBuffer();
bytes_readed = item.SourceStream.Read(buf.buffer, 0, buffer_size);
buf.ActualBytes = bytes_readed;
buf.DestinationStream = item.DestinationStream;
buf.DestinationName = item.DestinationName;
buffers_async.Enqueue(buf);
//notify chunk read finish
continue_copy = bytes_readed != 0;
}
}
public void Dispose()
{
//add to write queue buffer with destination_stream=null
//when write thread dequeue such buffer, write thread terminates
StreamWriterBuffer fake_buffer = new StreamWriterBuffer(0);
Enqueue(fake_buffer);
}
private void ReleaseBuffer(StreamWriterBuffer chunk)
{
lock (queue_free_lock)
{
queue_free.Enqueue(chunk);
}
wait_queue_free_ready.Set();
}
public void Enqueue(StreamWriterBuffer chunk)
{
lock (queue_write_lock)
{
queue_write.Enqueue(chunk);
}
//allow write thread proceed
wait_queque_write_ready.Set();
}
public void PrepareBuffers(int buffers_count, int buffer_size)
{
for (int i = 0; i < buffers_count; i++)
{
StreamWriterBuffer new_buf = new StreamWriterBuffer(buffer_size);
lock (queue_free_lock)
{
queue_free.Enqueue(new_buf);
}
}
wait_queue_free_ready.Set();
}
private StreamWriterBuffer WaitForReadyBuffer()
{
wait_queque_write_ready.Reset();
StreamWriterBuffer ret = null;
if (ActiveBuffersCount == 0)
{
wait_queque_write_ready.WaitOne();
}
lock (queue_write_lock)
{
ret = queue_write.Dequeue();
}
return(ret);
}
public StreamWriterBuffer WaitForFreeBuffer()
{
wait_queue_free_ready.Reset();
if (FreeBuffersCount == 0)
{
wait_queue_free_ready.WaitOne();
}
StreamWriterBuffer ret = null;
lock (queue_free_lock)
{
ret = queue_free.Dequeue();
}
return(ret);
}
private void internal_write()
{
while (true)
{
StreamWriterBuffer chunk = WaitForReadyBuffer();
if (chunk.DestinationStream == null)
{
break;
}
chunk.DestinationStream.Write(chunk.buffer, 0, chunk.ActualBytes);
ReleaseBuffer(chunk);
if (WriteChunkCallback != null)
{
WriteChunkCallback(chunk.DestinationName, chunk.ActualBytes);
}
}//end while
}
