xzone reactor

Reactor IntroductionReactor's working mode, like its name, is a reflection mode that, when an event occurs, invokes the registered processor based on the event that occurred.advantages and applications of reactorReactor most commonly used for non-blocking socket traditional design is a synchronous stop and wait protocol, read and write operations to wait for the current FD next read/write events, during which nothing can dry, the program is blocked on

Introduction of Reactor framework Reactor is an event-driven asynchronous framework released by the Spring community that not only decoupled the emphasis-using relationships between programs, but also effectively enhanced the system's multi-threaded concurrency processing capabilities. It is convenient to use the reactor framework based on the Springboot environm

In "Java NIO" author ppt "How to Build a scalable multiplexed Server with NIO" and Doug Lea "scalable IO in Java" pptThere is a description of the implementation of Java NIO through reactor pattern. Java NIO acts as a cross-platform IO operation. The IO model of the corresponding platform is encapsulated on different platforms.As already mentioned in the reactor pattern author, cross-platform operations can

Timer implementation Through the reactor mechanism, you can easily implement the timer function. The usage is as follows. Write an event reactor, reloadHandle_timeout ()This method is automatically triggered when the timer is triggered. ReactorSchedule_timer ()Method to register the timer. StartHandle_events ()Event distribution cycle. When you do not want to use a timer, you can use the

Nuclear reactorTime limit:1000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)Total submission (s): 12149 Accepted Submission (s): 5517Problem description There are two types of events occurring in a nuclear reactor:When the high-energy particle strikes the nucleus, the particle is absorbed, releasing 3 high-energy particles and a low-energy particle.When the low-energy particle strikes the nucleus, the particle is absorbed, releasing 2 high-energy particles and a low-energy parti

The reactor design mode is an event-driven design mode. Pattern-oriented software architecture, Volume 2 This mode is described in detail. The structure of this mode is as follows: The handle in the figure corresponds to the handles provided by the operating system, such as I/O handles, and the event_handler class holds these handles, The reactor class provides an event loop: handle_events (). The co

About callback: Callback is the basis of the observer mode and the reactor mode. In a word, callback is a two-way call mode. What does it mean? That is, the called party also calls the other party when called, which is called callback. "If you call me, I will call back ".Let's take a look at this typical method of using callback: Background 1: Class A implements the interface Ina Background 2: Class A contains a reference to Class B. Background 3: Cla

ZOJ 2314/SGU194 Reactor Cooling, zojsgu194 Passive sink point upstream and downstream feasible stream problems ..... Graph creation: For an edge u ---> v low (u, v) high (u, v) connected edge u ---> v high (u, v)-low (u, v) it becomes a network flow problem with no upper or lower boundaries. However, this does not necessarily satisfy the low relationship, so I add low ..... Set free stream g (u, v) = high (u, v)-low (u, v) The traffic at each vertex

This article can be seen as a translation of Doug Lea scalable IO in Java. Currently, distributed computing Web services are prevalent, and the underlying layers of these network services are inseparable from socket operations. They all have a common structure:1. Read Request2. Decode request3. Process Service4. encode reply5. Send reply The classic network service is designed to process data in each thread: However, when the user load increases, the performance will decrease very quickl

extending from a thread perspective, but this processing is still a blocking process. First, simply establishing a connection (socket) consumes the server's thread resources. If the client has not made the corresponding data request, then the server will wait for their data to flow, and then read, and so on ... have always been blocking. The server is in a high-load state.After NiO came out, into the reform and opening up period, with so many roles, Serversocketchannel,selectionkey,selector.Wha

1 Reactor Framework Overview The reactor framework in POCO is designed based on the reactor design pattern. In which the event generated by a Socket is sent by Handler to the method of the specified object, as a callback. 2 Light said not practice fake Poechantreactorserver class, Basic and Poechanttcpserver: Class Poechantreactorserver:public serverapplicat

stream in the network flow is a sufficient and necessary condition for a feasible stream-the restriction condition and the balance condition, it is converted into a capacity network without a lower bound. It is not difficult to understand those proofs of mathematical models. For more information, see the paper "a simple method to solve Network Flow Problems with upper and lower limits of traffic". The transformation methods seem to be quite popular. I use the following methods: Set d [u] to t

This is an example in Chapter 6 of the ACE learning tutorial mentioned in the title. # Include "ACE/reactor. H "# include" ACE/handler "# define port_no 19998 typedef ace_sock_acceptor acceptor; // Forward Declaration class my_accept_handler; // data processor class my_input_handler: Public ace_event_handler {public: // constructor my_input_handler () {ace_debug (lm_debug, "constructor \ n");} // calls back any data from the handle int handle_input (

minimum residual amount of all arcs so far{ if(x = = T | | a = =0)returnA; int i = cur[x];//Dfs to the same point multiple times when backtracking if(i = =0) i =Head[x]; intFlow =0, F; for(; i;i = E[i]. Next) {//starting with the last thought of the arc intv =e[i].to; if(D[v] = = d[x]+1 (f = DFS (V,min (A,e[i].cap-e[i].flow))) >0) {E[i].flow+=F; E[i^1].flow-=F; Flow+=F; A-= f;//Residual quantity-flow if(A = =0) Break; } } returnflow;}intDinic () {intFlow =0; whil

#include 　　Hangzhou Electric OJ--2085 nuclear reactor

=0; R.low=Low ; R.up=Up ; Edges.push_back (R); Edge D; D. from=to ; D.to= from; D.cap=0; D.flow=0; //R.low=low;r.up=up;Edges.push_back (d); M=edges.size (); g[ from].push_back (M-2); G[to].push_back (M-1);}//Each phase comes with a DFS augmentationintDFS (intXinta) { if(x==t| | a==0)returnA; intflow=0, F; for(intI=CUR[X]; I) {Edge e=Edges[g[x][i]]; if(d[x]+1==d[e.to] (F=dfs (E.to,min (a,e.cap-e.flow)) >0) {E.flow+=F; Edges[g[x][i]^1].flow-=F; Flow+=F; A-=F; if(a==0) Break; } } re

Yes, there's a wide search.#include using namespaceStd;structVEC//This is where the adjacency matrix is used to compare wasted space so with the adjacency table here is the weighted graph so with the structure of the composition{intPoint,Cost;friendBOOLoperatorVEC A,VEC b) {returnA.Cost>B.Cost; }};intT,S,D,Sta[Maxn],En[Maxn],Dis[Maxn];VectorVec>Fuck[Maxn];voidInit(){Fill(Dis,Dis+Maxn+1,Inf); for(intI=1;IMaxn;I++)Fuck[I].Clear();}voidDij(intSs){Priority_queueVec>Q;Dis[Ss]=0;VEC Temp;Temp.Point

First, let's take a look at the question of lower-bound network streams. In addition to the capacity of each arc, the upstream and downstream network flow problem also specifies a lower limit, the traffic on the arc should not be less than the lower limit of the arc. We recommend an article http://wenku.baidu.com/view/0f3b691c59eef8c75fbfb35c.html this article introduces the solution to this kind of problem. After reading this article, it should be a piece of cake to solve this problem. Figure 1

1gb/s level, can be understood as basically not time-consuming. The following illustration is a comparison of several common I/O models: Java NiO is the second or third form: The second: In a while loop inside constantly check Selector whether there are events triggered Selector.select (1000) The third: Selector.select () Checks whether there is a ready event, and if not, it blocks until the Ready event function returns. reactor There is an article

( !thread.interrupted ()) { NewThread (NewHandler (Serversocket.accept ())). Start (); } } Catch(IOException e) {e.printstacktrace (); } } Static classHandlerImplementsRunnable {Finalsocket socket; Final Static intmax_size=1024; PublicHandler (socket socket) { This. socket=socket; } @Override Public voidrun () {//TODO//This is where the data in the socket is read and processed, and the results are written to the socket . } }}High-performance IO targets and