This article demonstrates how to forward real-time feed to multiple clients with different bandwidths. First one is the simplest case as we have only one client so we can store arrived data in a single queue, and manage it with simple queue management technique.
Real time stream distribution is a critical issue that needs a perfect data structure to store and distribute real time feed efficiently. Process feed (transfer-compress-encrypt) then store results in a temporary storage, then send results to all clients. Second, to enable sending data in different threads so as to balance send operation depending on clients' bandwidths.
Receiving data doesn't be blocked while sending data from the same storage for each client. We isolate receiving data from sending it in a separate threads, because both are working on the tail node.
Previous point is the key for the whole article as it is the solution for slow (low bandwidth) clients. The standard usage of the function Enqueue is to add new node at queue tail, but in our queue it does only that if the tail node is full of data. In circular queue the last node is connected back to the first node to make a circle, which is done each time I need to add a new node to receive more feed. The queue uses its protected function Dequeue() to retrieve an node to send its data to client.
First is Recv(const char* pBuffer, int nLength), which is a simple call with the buffer to be saved in the queue.
SharedQueue is a thread safe class as it synchronizes changes of its linked list with critical section.
One thread to analyze feed and format a new feed suitable for clients and save it in a secondary queue. If a client disconnected due to network errors, our system should let it for a certain period in threads data hoping that it will reconnect again shortly.
That feed can be associated to one or several clients, and can be associated as a whole to all clients, or each client has its own parts (packets) of feed.


So, the Enqueue() function doesn't add new node unless tail node receives its full 32 K bytes, then it adds a new node and adjusts the new tail.
In other words, the Queue uses the Enqueue function to get the working (not full) tail node. So, Hear and Tail nodes are moved one node each time I need a new node, and the length between them is kept fixed, which represents queue length. Also, for real-time clients, send is done with client node pointer which is always the tail node for normal and fast clients.
Each client must have a pointer (initialized to NULL) to its working node and the offset in this node. It receives buffer with any length and calls Enqueue function to get the working queue node to keep data. The code listed here defines one queue, one thread to receive feed, and one thread to distribute this feed to clients list. Queue Linked List changes are limited to add or remove new nodes to the queue, which is done by Enqueue, Dequeue, or Clear functions. User of this class can take data and transfer it to any type or do any processing like compression or encryption, then keep or send it.
And to join new clients to the threads we can use a simple Round-robin scheduling to add new clients. In this way the object regarding this client still keeping its offset in the queue and will continue from its last location in the data. Number (2-1) means that the sender of the feed must include destination id in each sent packet.
Each client object should pass its working node pointer and send offset to the Queue to send to each client depending on its location in the whole queue.
For slow non real-time clients, send starts from Head node and goes fast to tail node to work like real-time clients. The Dequeue function uses these parameters to adjust next working node and offset as in the following flow-chart. The other functions Recv and Send are independent, so no need to synchronize their access, and they are the only callers for Enqueue and Dequeue.


Lately it turned out the 15 remaining people reported missing in flooding have been confirmed safe. New entity is added to the tail of the queue and old entity is removed from the head terminal. The Dequeue function doesn't remove nodes as in normal queue because shared queue sends data to multiple clients. Therefore, if the sender is a socket class and has a good connection it will be always synchronized with the receive process. So, the user of the shared queue can design one thread to receive feed and multiple threads to send it or its resultant as in section Feed Distribution.
If the keeping period is exceeded, the systems should delete client object, and next time it reconnects, it will join in the queue tail to receive just arrived feed as a new client. So, slow clients may delay the removal of head entity of the queue, in addition, the whole sending process. Hence, all queue nodes is kept until they can be user again in the Enqueue function to implement a circular queue. Section (2-2) means the feed is forwarded to all clients, so no need for packets to include destination id.
The distributor agent must handle this case in some way to make sure fast clients receive real time data on time, and slow clients receive real time data as bandwidth allows. The last point to mention is the type of the client, if it is a real-time then it should join the queue for the first time at its tail to receive last received data, or if it is not real-time it should join the queue at its head to receive all data. Client information (SendNode, NodeOffset) are passed to the Send function to be used as in the following Flow-Chart and Code. Torrential rain in Ibaraki, Tochigi and Miyagi prefectures that started on September 9 has killed seven people.



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