observability engineering

Refer to the big talk design pattern and some information on the net, write down some simple design patterns, let yourself understand the beauty of these design patterns!#ifndef operation_h#define operation_h#include#include "operation.h" int main () {double NumA, numb;char op;operation * oper;operationfactory opfa;cout Design pattern C + + implementation one: Simple engineering mode

=" Wkiom1sc5evdzcxeaab-ykngihg717.jpg "/>The Pom file under Code-parent inherits the Pom.xml for the Pom.xml under the parent pom.xml,code-utils and Code-web.5.5 Code-parent's Pom.xmlThe value of packaging in the configuration is pom, which means that code-parent is an aggregation module or a parent module, where it belongs to both. The modules is configured with two modules, namely Code-utils and Code-web.The pom.xml of 5.6code-utils and Code-web Code-parent/code-utils/pom.xml The

sub-arrays, summing them separately, finding the maximum sum, and the time complexity of \ (O (n^2) \)2.Kadane algorithmCodingdef kadane_solve(numbers): = numbers[0] =0 forin numbers: if0: = i else: += i =max(tmp_sum, max_sum) returnmax(0, max_sum)If the accumulated value is negative, overwrite the accumulated value with the newly read-in value, otherwise continue to accumulate with a time complexity of \ (O (n) \)Test CasesCodingImportUnit

plugin: ' Eclipse '> Gradle EclipseLs-al found out. ProjectSimilarly, discovering Gradle Java can also be performed:: Compilejava Up-to-date:p rocessresources Up-to-date: Classes Up-to-date: JavadocThe result is that the Javadoc document is compiled and generatedSummaryApply plugin: ' java ' Apply plugin: ' eclipse ' sourcecompatibility = 1.5version = ' 1.0 ' jar { manifest { attributes ' I Mplementation-title ': ' Gradle Quickstart ', ' implementation-version ': Ver

Both Mapper.xml and Mapper.java are present in the project, and the tangent names correspondI'm used to putting mapper XML and Java in the same directoryOn the Internet to see the various methods have failed1 2 DOCTYPE Mapper 3 Public "-//mybatis.org//dtd Mapper 3.0//en"4 "HTTP://MYBATIS.ORG/DTD/MYBATIS-3-MAPPER.DTD" > 5 6 7 Select *from User where id=#{id}8 9 This is changed before the code, the problem is Because the MAVEN build is used, add the following code to the /*.propert

the kernel's EBPF syntax and registers are complex, similar to real assembly code.So why does the kernel have to go through the trouble of implementing such an engine? Because it's lightweight, secure, and portable. Because it is intermediate code, portability does not have to be said, but using kernel modules to invoke the kernel's function interface is generally portable, so this is not a very important reason. EBPF code in the implementation of the process is strictly restricted to prohibit

FE the movbyte ptr [ebp-2], the//character "C" into the stack. 004030CA8D45 FBLeaEAX, DWORD ptr [ebp-5]//Get the string address into eax. 004030CD - Pusheax//Parameter "Calc" into the stack004030CEB8 c793bf77moveax, Msvcrt.system//Gets the system function address Msvcrt.dll is loaded by default, so there is no LoadLibrary. 004030d3FFD0PagerEAX//Call the system function to start the calculator.Machine code:0X8B,0XEC,0X33,0XFF,0X57,0X57,0XC6,0X45,0XFB,0X63,0XC6,0X45,0XFC,0X6

Original address: http://www.it165.net/os/html/201411/10142.htmlZookeeper GitHub is: https://github.com/apache/zookeeperUnzip, open cmd, switch to the root directory of the zookeeper source (there is a build.xml file below), then enter the command > Ant eclipseThe following interface prompts the compilation to succeed:Then open Eclispe, whatever version, choose Import, type is the existing Eclispe project.Click Done, but found that my source has several errors, but the type is the same, are cann

efficiency, but requires less resource overhead (memory and CPU), so most of the slob is used in embedded systems, but the current embedded system computing power is generally strong, So slob basically out of the historical stage.Memory Policies: PolicyBecause of the advent of NUMA, it is necessary to allow the user program to control where its memory is applied. Mpol_default, mpol_preferred, Mpol_interleave, and mpol_bind, memory policies inherit from the parent process.The memory used can als

, there are other similar mechanisms, such as EVMS, Dmraid. But LVM is widely used.Working styleThis mechanism cannot be done only in user space and requires code assistance in kernel space, which is Device-mapper (Dm_mod module). The Dm_mod module completes the conversion of the IO request, which is essentially a mapping as in memory management. The code is located in DRIVER/MD. This part of the code is a vivid embodiment of the separation of policy and mechanism, the policy is specified by the

corresponding interrupt processing function, processing multi-CPU access and interrupt re-entry problems, and then invoke the real interrupt processing function, that is, the upper layer of interrupts. However, the kernel makes a difference here, if the kernel determines if the interrupt has been nested (at the same time more interrupts), the interrupt handler function is run as a kernel thread, otherwise it will run directly. So, we can often see in the output of the PS command:These soft inte

First, the topic requirementsTitle: Returns the number of the largest sub-arrays in a two-dimensional integer array. Requirements: Enter a two-dimensional shape array with positive and negative numbers in the array. A two-dimensional array is connected to the end of the line, like a belt. One or more consecutive integers in an array make up a sub-array, each of which has a and. The maximum value for the and of all sub-arrays.Requires a time complexity of O (n). Second, the design idea first call

elements. The maximum range that can be computed is 10,0000, and it takes about half a minute to calculate the 10,0000. In addition to the computed range, it is almost equal to the dead loop and the operation time is too long.Solution: The solution to the direct response is to change int to longint or to a wider range of other types. Teacher Example Hospital Medical insurance system, the content of the query display year divided into monthly display, narrow the display, reduce the display conte

First, the topic requirementsTitle: Returns the and of the largest sub-array in an integer array. Requirements: Enter an array of shapes, with positive numbers in the array and negative values. One or more consecutive integers in an array make up a sub-array, each of which has a and. If the array a[0] ... A[j-1] next to each other, allowing a[i-1], ... A[n-1], a[0] ... A[J-1] and the largest. Returns the position of the largest subarray at the same time. The maximum value for the and of all sub-

1, topic RequirementsThe largest subarray of the one-dimensional array and the end-to-end ring, the array contains positive and negative two.The position of the output maximum sub-array.2, thinking DesignThe first idea is to extend the original array, that is, the array length of the n number becomes 2*n-1.In fact, we refer to Baidu, using the method of seeking redundancy.If all the numbers are negative, you need to add a judgment.3,4,5,Introduction to Software

The Getbean method of Spring container is implemented by reflection mechanism , and the following test program simulates the implementation principle of Getbean . .Step one :p om.xml file configuration parse XML file Dom4j.jarStep two : Configure the Bean label in the XML fileStep three : create the test class parsespringxmltest, set the member properties , because the bean The Scope property is not set in the label , so a Singleton is created by default using singleton . here to create a Ma

8:00 9:50 10 100 Computer network Classes 10-minute break at recess 16:20 16:50 30 Read "Dream Break Code" 17:21 18:37 20 56 Writing the four Operation program In order to complete the PSP record table Bug log:Stude

first, and that if more than one servlet uses the same number when setting loadonstartup, using annotations The container implementation vendor can decide for itself which servlet to load.Supplemental Add: Callout (Annotation) declaration, you do not need to re-declare the servlet information in Web. xml: Attention:metadata-complete= "false" default is metadata-complete= "true" required modification of servlet3.0 Deployment Profile web.xml top-level label with basic, primitive servlets su

Use Xcode to write C + + programs [1] new C + + Project EngineeringThe first section starts with the new project and compiles C + + source codeNew ProjectSource:////main.cpp//Yehelloworld////Created by Xianmingyou on 15/3/5.//Copyright (c) 2015 xianmingyou. All rights reserved.//#includeusing namespacestd;intMain () {cout"Hello, world!\n."Endl; return 0;}Printing information:--------------------------------------------------Hello, world!.Program ended with exit code:0[C + +] using Xcode to write

...... /.. /inet/examples, .... /.. /inet/src-l. /.. /inet/src/inet--record-eventlog=false--debug-on-errors=false Ft42.iniOrUnable to alloc bytesthis application have requested the Runtime to terminate it in an unusual. Please contact the application's support team for more information. Font {Segoe UI} 9 still in cache. Simulation terminated with exit code:3working Directory:d:/omnetpp-4.2.2/samples/openflow/scenarioscommand line:. /openflow.exe-r 0-u tkenv-c exr-noweight-n...... /.. /inet/examp