prtg overview

); } processdispatchresult (Processedrequest, Response, Mappedhandler, MV, dispatchexception); } Catch(Exception ex) {triggeraftercompletion (processedrequest, Response, Mappedhandler, ex); } Catch(Throwable err) {triggeraftercompletion (processedrequest, Response, Mappedhandler, NewNestedservletexception ("Handler processing failed", err)); } finally { if(asyncmanager.isconcurrenthandlingstarted ()) {//Instead of Posthandle and Aftercompletion

National Laboratory. 2005 was used by the United States Army Research Laboratory to simulate the Russian anti-missile chariot zsu23-4 by plane wave attack, its compute nodes are up to 2.5 trillion.In addition, using the visual library makes it quick and easy to make 3D animated presentations that make data results more convincing.Visual Official Website: http://vpython.org/5. Image processing and computer visionOPENCV is initiated and developed by Intel Corporation and is licensed for distribut

these layer components are managed by spring, and enjoy the benefits of spring transaction management, AOP, etc. And the only entrance to the request is Dispachterservlet, which implements the request function by mapping the request to the corresponding web-tier component.Remote Access application scenarios:Spring can be very convenient to provide exposed RMI service, remote access services such as Hessian, burlap, etc., the implementation is very simple simply by configuring the appropriate ad

the data, but also the operations defined on the data. In the future there may be representative (agent) Exchange, the agent has a certain degree of intelligence, that is, the more advanced stage of information exchange.With the rise of the internet and the advent of Java, huge, bloated applications have begun to develop into miniaturization, with many "living" small applications (applets) on the Internet collaborating to complete the processing and delivery of information. Java will accelerate

component of a source file is the class, such as the HelloWorld class in this class . A source file can have up to one public class. The number of other classes is unlimited if the source file contains a public class, the file name must be named by the class name. Java the application's execution portal is Main () method. It has a fixed writing format:publicstatic void Main (string[] args) {...} L Java The language is strictly case sensitive. the Java method consists of

n, denoted by T (n), if there is an auxiliary function f (n), so that when n approaches infinity, the limit value ofT (n)/f (n) is not equal to zero constant, then f (n) is t (n) The same order of magnitude functions. Memory as T (n) =o (f ( N)), called O (f (n) ) is the progressive time complexity of the algorithm, referred to as time complexityComplexity of space:The storage space consumed by the algorithm is also a function of the problem size n. It is a measure of the amount of storage spac

authentication Module (PAM) framework, which extends The Java platform security architecture to support user-based authorization.1.8.8 Java certification and certification servicesJava and authentication Services (JAAS) provide methods for Java EE applications to authorize and validate specific users or groups that run it.Jaas is a Java programming language version of the standard Pluggable Authentication module framework that supports user-based authentication for the extended Java Platform Se

to shield the host operating system threading technical details, so that Java programmers do not have to care how to map the Java Language threading mechanism to the host operating system line libraries, This task is completely done by the Java virtual machine. Within the JVM, a program's multitasking is implemented through threads. When you run a Java application with a Java command, a JVM process is started. In a JVM environment, the user thread runs in the form of threads.The meaning of mult

;ContextconfiglocationParam-name> Param-value>Classpath:/conf/applicationcontext.xmlParam-value> Context-param> Listener> Listener-class>Org.springframework.web.context.ContextLoaderListenerListener-class> Listener> servlet> Servlet-name>ViewspaceServlet-name> Servlet-class>Org.springframework.web.servlet.DispatcherServletServlet-class> Load-on-startup>1Load-on-startup> servlet> servlet-mapping> Servlet-name>ViewspaceServlet-name>

Shell1) is a scripting language used on the Linux operating system, providing interfaces for user interaction with the system, similar to the command prompt in Windows, but more powerful;2) can be executed by the command line, or it can be edited as a script file;3) mainly for automation simple system or software operation task;4) Easy to configure, maintain and transplant, do not fancy execution efficiency;5) The generic Shell is a bash (GNU Bourne-again Shell) in the GNU Toolset, which is inst

directories and sort commands:Find. -type D |Sortoutput: [[email protected] test]#Find. -type D |Sort../SCF./scf/bin./scf/Doc./scf/lib./scf/service./scf/service/Deploy./scf/service/deploy/Info./scf/service/deploy/product./test3./test4./Test5./test5/Test3[[email protected] test] #实例6: Find file by size command:Find. -size +1000c-print output: [[email protected] test]#Find. -size +1000c-Print:/test4./SCF./scf/lib./scf/service./scf/service/Deploy./scf/service/deploy/product./scf/service/deploy/Inf

() directives to embed reporting code in C.Conditional branching optimizationFor conditional selection statements, conditional branching can be optimized according to the branch declaration statement before compilation, when frequent conditions often occur or rarely occur. Example:/**/if (unlikely (err)) { ...}It is important to ensure that the current conditions are set up in the vast majority, and if you judge correctly, the performance of the program will be improved, otherwise it will d

First, briefAuthentication and encryption method of SSH connectionThe SSH connection is the CS model (client-server), the client makes the connection request, the server authenticates the client, and then considers whether to accept the connection request.The theoretical basis of SSH's secure encryption method is asymmetric encryption system. In the asymmetric encryption, the common one is the RSA encryption algorithm. When using SSH, it is important to first clarify the asymmetric encryption an

according to the protocol requirements of the device. SPI Universal Device Driver Sometimes, given the variability of the devices connected to the SPI controller, the kernel is not equipped with the appropriate protocol driver, in this case, the kernel prepares a generic SPI device driver for us, which provides the user space with a control interface to control the SPI control. The specific protocol control and data transfer work is left to the user space according to the specific equipme

learn the interfaces that these three types of devices provide to us. (17) static compilation (re-download compiled Linux kernel) and dynamic compilation. The development phase is dominated by dynamic compilation (without restarting the kernel). Dynamically loaded in the same way as the module. (18) The main device number distinguishes device drivers. The secondary device number distinguishes between multiple devices created by the same driver. Common to multiple serial ports and hard disk part

1. What is BashIn Windows systems, the most common use of a graphical interface is to perform performance. Sometimes we also use DOS commands to execute commands, where DOS is a text-mode interface, and we have some DOS instructions that can be done by interacting with the kernel of the Windows system. For example, the DIR directive is similar to the LS directive in Linux. The DOS command line we use here is similar to the Linux Bash shell environment.BASH is the abbreviation for the Bourne Agai

be divided into two categories according to the stipulated content. The first class is about the organization of the device tree, such as the name of the node is composed of which characters, length, etc., the first type of specification is more basic, is the premise of understanding the second type of norms. The second type of specification is about the contents of the device tree, such as how multicore CPUs are described, and the second type of specification can be seen as a specific applicat

red output Hello world. 　　2. Define the script:A, create a hello.sh text file;b, and then start with #!/bin/bash, where the declaration of the script must be added.c, output instructions. The # in the instruction indicates the meaning of the comment.Cases:#!/bin/bash#myFirst program! Echo " \e[1;31mhello wolrd\e[0m"　　3. Execute scriptA. Execute scripts directly using bash hello.sh, but this is inconvenient and the advantage is that you do not need to give script execution permissions.B

can now be ported to other Unix-like systems: both Linux and System V variants support sockets. The above communication mechanism will be described in detail.Attached 1: reference [2] provides a summary of the processes in the Linux environment:In general, the processes under Linux contain several key elements: There is an enforceable procedure; There is a dedicated system stack space; The kernel has its control block (Process Control block), which describes the resources

.//Cin,cout Need# include//Vectot Need# include//The accumulate algorithm requires# includeusing namespacestd;intMainvoid) {vectorint>v;//defines a vector container of vectors for(inti =0; I Ten; i++ ) { //Use the extension of the tail element to assign a valueV.push_back (i); } Vectorint>::iterator it;//use iterator iterators to traverse all elements sequentially for(it = V.begin (); It! = V.end (); it++ ) { //the value of the element at the current position of the o