multiplexer demultiplexer

keep-alive state, The message sender cannot write the TCP buffer again, and the io,write operation with the synchronized blocking will block indefinitely until the TCP window size is greater than 0 or an IO exception occurs. Source code under the Src/main/java/nioinduction/pseudoasynchronousio, divided into clients and service side. The client, like the client of the bio, joins the thread pool Executorservice, and the relevant constructors are consulted by the reader. 3.NIO The NIO library is

message sender can no longer write the TCP buffers to the data, and the io,write operation with synchronous blocking will block indefinitely until the TCP window size is greater than 0 or an IO exception occurs.The source code under Src/main/java/pseudoasynchronousio, divides into the client and the service side. The client and the bio client, the service side joins the thread pool Executorservice, the related constructor requests the reader to consult itself.3.NIOThe NIO library, introduced in

Ibevent:Reactor Reactor Model:Key parts:1) Event SourceLinux is a file descriptor, Windows is a socket or handle, here is known as a "handle set", the program on the specified handle register the event of interest, such as I/O events.2) Event demultiplexer--events Multi-channel collection and distribution mechanism (in fact, epoll, etc., directly used in reactor)The I/O multiplexing mechanisms provided by the operating system, such as SELECT and Epoll

. Composition of the file event handlerShows the four components of the file event handler, which are sockets, I/O multiplexing programs, file event dispatcher (dispatcher), and event handlers, respectively.A file event is an abstraction of a socket operation that produces a file event whenever a socket is ready to perform operations such as a connection answer (accept), write, read, close, and so on. Because a server typically connects multiple sockets, multiple file events can occur concurrent

: Reactor mode framework The following components are required to use the Reactor model:Event source, Reactor framework, multiplexing mechanism, and event processing program. Overall Reactor model framework Reactor Model UML Handle event Source Handle represents the resources managed by the operating system, including network links, opened files, timers, and synchronization objects. Linux is a file descriptor, while Windows is a Socket or Handle, which is called a "Handle set". A program r

This is a creation in Article, where the information may have evolved or changed. Reference Golang Building an HTTP serviceServer.go Source HTTP Network development, many network applications are built on the basis of the re-HTTP service. The HTTP protocol from birth to the present, development from 1.0, 1.1 to 2.0 also continue to progress. In addition to the details, the Web application that understands HTTP builds is focused on the two-side---client (clinet) and server side (server),

"??0x03000000-0x03b60000: "Safe-ramdisk-b"0x03b60000-0x03b80000: "SAFE-DTB"0x03b80000-0x03f60000: "Config"0x03f60000-0x03fa0000: "U-boot env"0x03fa0000-0x04000000: "U-boot"NAND device:manufacturer id:0x20, Chip id:0xda (ST Micro NAND 256MiB 3,3v 8-bit)Scanning device for bad blocksCreating 1 MTD partitions on "4e0000000.ndfc.nand":0x00000000-0x10000000: "Log"I2c/dev Entries DriverIBM IIC Driver v2.1IBM-IIC (/plb/opb/[email protected]): Using standard (+ kHz) modeIBM-IIC (/plb/opb/[email protecte

, the operating system provides IO multiplexers (for example, select, poll, and Epoll under Linux), which are encapsulated by Java (typically using the best performing epoll) and the corresponding IO multiplexing API. The typical programming pattern for the Multiplexed API for NIO is as follows:Selector Selector = Selector.open ();//creating a multiplexerSocketchannel channel = Getchannel ();//get Socketchannel in NiO, representing an IO connection//register the channel with the

CPU resources; Reusability, the reactor framework itself is independent of the specific event handling logic and has high reusability. Reactor Mode frameworkUsing the reactor model, several components are required: Event source, reactor framework, multiplexing mechanism, and event handler, first look at the overall framework of the reactor model, and then describe each component one by one.　　 　　 1. source of the event Linux is a file descriptor, W

demultiplexer--multi-channel distribution mechanismThe I/O multiplexing mechanisms provided by the operating system, such as SELECT and Epoll. The program first registers its concerned handle (the event source) and its events on the event demultiplexer, and when an event arrives, event Demultiplexer notifies "the event of one or more handles is ready in the regi

time, although the reactor itself is still synchronous;2) programming is relatively simple, can avoid complex multi-threaded and synchronization problems, and avoid multi-threaded/process switching overhead;3) scalability, can be easily by increasing the number of reactor instances to make full use of CPU resources;4) reusability, the reactor framework itself is independent of the specific event handling logic and has high reusability;3, Reactor mode frameUsing the reactor model, several compon

following advantages:1) fast response, without blocking a single synchronization time, although the reactor itself is still synchronized;2) programming is relatively simple, which can avoid complicated multithreading and synchronization issues to the maximum extent, and avoid overhead of switching multi-thread/process;3) Scalability: CPU resources can be fully utilized by increasing the number of reactor instances;4) reusability. The reactor framework is independent of the specific event proces

version of Libevent (likevent).Ix. Choosing the best I/O multiplexing1. Encapsulating I/O multiplexing as an event multiplexerAs we said earlier, the Libevet itself is a typical reactor pattern, and a component in reactor mode is called the event multiplexer, which is actually the encapsulation of an I/O multiplexing. So the problem is that the I/O multiplexing mechanism provided under each system is not the same, even if there are many interfaces

://s3.51cto.com/wyfs02/M02/6C/1B/wKioL1VATsnh6_eoAADNjI_b_b8004.jpg "style=" width : 600px;height:420px; "title=" w0200810182005412015194.jpg "width=" "height=" 420 "border=" 0 "hspace=" 0 "vspace=" 0 " alt= "Wkiol1vatsnh6_eoaadnji_b_b8004.jpg"/>Wavelength Division Multiplexing (WDM) and Multiplexer (also known as wave/splitter) are applied to both ends of optical fiber, respectively, to realize the coupling and separation of different light waves. Th

provide it to the network provider filter. The Code does not set the priority Selection Component list, so each output pin of the MPEG-2 demultiplexer filter will output the default basic stream. 3. Create a network providerAs mentioned above, the network provider filter controls the tuning process and works with the transport information filter to retrieve program information from the transmission stream. To select the network provider type, you sho

Server TuningThe core component of WebLogic server consists of a listening thread, a socket multiplexer, and an execution queue of executable threads. When a server receives a connection request from a listener thread, its connection control is handed over to the socket multiplexer waiting to receive the request. The socket multiplexer then reads the request to l

multiplexing API. The typical programming pattern for the Multiplexed API for NIO is as follows:Open a Serversocketchannel, listen on port 8080 for Serversocketchannel server = Serversocketchannel.open (); Server.bind (new Inetsocketaddress ("0.0.0.0", 8080));//Create a multiplexer selector selector = Selector.open ();//register serversocketchannel on a multiplexer and declares that it is concerned about i

an operation and let the kernel notify us after the entire operation is complete, including copying the data from the kernel to the user's own buffer area. The difference between an asynchronous IO model and a signal-driven IO Model: signal-driven IO is the kernel's notification of when an IO operation can begin; The asynchronous IO Model notifies us when the IO operation has been completed. The core concept of NiOBuffer buffers: All data is treated with a buffer. A buffer is essentially an arr

Step One: Open Socketchannel, bind the client-local address (optionally, the default system will randomly assign an available local address), the sample code is as follows:Socketchannel Clientchannel = Socketchannel.open ();Step two: Set Socketchannel to non-blocking mode while setting the TCP parameters of the client connection, the sample code is as follows:Clientchannel.configureblocking (FALSE);Socket.setreuseaddress (TRUE);Socket.setreceivebuffersize (buffer_size);Socket.setsendbuffersize (

-white list filtering, handshake, and other operations; After step 2 is complete, the business layer's link is formally established, the Socketchannel is removed from the reactor thread's multiplexer on the main thread pool and re-registered on the thread of the sub thread pool to handle I/O read and write operations. 2. Netty Threading Model 2.1. Netty Threading Model ClassificationIn fact, the threading model of Netty is similar to the thre