microservice patterns and best practices

and cannot be overused. If a class has hundreds of different interfaces, some of which are separated according to the client program, others are separated by version, then the class is hard to figure out, and this kind of hard-thinking is very frightening.12.5 ConclusionFat classes can cause unhealthy and harmful coupling relationships between their client programs. When a client program asks for a change to the Fat class, it affects all other client programs. Therefore, client programs should

following code: Public class base{ publicvirtualvoid f () {/*some code* / }}publicclass derived:base{ publicoverride void f () {}}The function f is implemented in base. However, in derived, the function f is degenerate. Perhaps, derived programmers think that function f is useless in derived. Unfortunately, base users do not know that they should not call F, so there is a substitution violation.The existence of degenerate functions in degenerate classes does not always mean that the LS

run, the faster you will find any deviations from those tests. If you can run all the tests multiple times a day, the system will not expire for more than a few minutes. This is a reasonable goal. We will never allow the system to regress. Once it is working at a specific level, it must not be reversed to a slightly lower level.However, validation is only one of the benefits of writing tests. Both unit and acceptance tests are a form of documentation. Such a document can be compiled and execute

In web development, because differences between browsers are implemented differently, some sniffing work is unavoidable, such as the fact that we need to be able to use the universal event binding function in each browser addevent//General Wording//Cons: Every time he is called, it executes the IF condition,varAddevent =function(Elem, type, handler) {if(window.addeventlister) {returnElem.addeventlistener (type, Handler,false); } if(window.attachevent) {returnElem.attachevent (' on ' +type, ha

Analysis of Android source code design patterns and practices (10)Chapter 10 interpreter Mode The interpreter mode is a relatively small behavior mode, which provides a syntax or expression method for interpreting languages. However, it is widely used, but it is rarely used because we seldom construct the grammar of a language. 1. Definition Given a language, it defines a syntax expression and an interpre

[teamcolor]| | [];//all members of the team for(vari=teamplayers.length-1;i>=0;i--){ if(teamplayers[i]===player{Teamplayers.splice (i,1); } } }; //Players Change Teamoperations.changeteam=function(Player,newteamcolor) {operations.removeplayer (player); Player.teamcolor=Newteamcolor; Operations.addplayer (player); } //player DeathOperations.playerdead=function(player) {varTeamcolor=Player.teamcolor, Teamplayers=Players[teamcolor]; varAll_dead=true; f

addevent wraps the correct logical function, the code is as followsBut there is still one drawback to this function, assuming that we have not used the Addevent function from beginning to end.The third option is to use the lazy loading scheme, the first time you enter the conditional branch, the function will be overridden inside the function, the rewritten function is what we expect the Addevent function, the next time we enter the Addevent function, Addevent does not exist those branch judgme

object in an interface, can execute different objects method, equal to the director said a boot, the rest of the people can do their own thing.Here we assume that the object has an Execute method, if the object does not have a common method, it can also add one to the object, if the object is created by new way on the prototype chain, if not through new, directly add1 //The New Way2Menubar=NewMenubar ();3Menubar.prototype.execute=function(){4 This. Refresh (); The methods that really need

the work of creating nodes in batches, such as creating 1000 nodes in 1 seconds, instead of creating 8 nodes every 200 milliseconds. varTimechunk =function(ary,fn,count) {varobj, t; varLen =ary.length; varStart =function(){ for(varI=0;i){ varobj =Ary.shift (); FN (obj); } }; return function() {t= SetInterval (function(){ if(ary.length ===0) {//If all the nodes have been Created. returnclearinterval (t);

Analysis of Android source code design patterns and practices (23rd)Chapter 2 appearance Mode The appearance mode is one of the structural design modes. It is frequently used in development and is a common method for encapsulating APIs. Third-party sdks we often use are basically used in the appearance mode, which can shield users from many implementation details and reduce user costs. 1. Definition It is

Analysis of Android source code design patterns and practices (19th)Chapter 2 combination mode The combination mode is also called the partial-overall mode, one of the structural design modes. 1. Definition Combine objects into a tree structure to represent the "part-whole" hierarchy, so that users can use a single object and a combination object in a consistent manner.2. Use Cases (1) indicates the part

Analysis of Android source code design patterns and practices (15th)Chapter 2 template method mode The template method pattern is the simplest behavioral design pattern, one of the most common patterns in all patterns, and is the basic technology based on inherited code reuse. In its structure, only the inheritance r

Analysis of Android source code design patterns and practices (13th)Chapter 2 memorandum Model The memo mode is a behavior mode that stores the current state of an object and can be restored to this State later. It is a bit like what we usually call "regret ". 1. Definition Capture the internal state of an object without interrupting the closed state, and save the state outside the object. In this way, th

Analysis of Android source code design patterns and practices (9)Chapter 9. Responsibility Chain Model 1. Definition The responsibility chain mode is one of the behavioral design patterns. It gives multiple objects the opportunity to process requests, thus avoiding the coupling relationship between request senders and recipients. Connect these objects into a chai

varProxysynchronousfile = (function(){7 //array of Cache IDs8 varCache = [];9 //A variable that marks whether the inertia time endsTen varTimeisnotup =NULL; One A return function(ID) { - Cache.push (ID); - if(timeisnotup) { the return; -}Else{ -Timeisnotup = SetTimeout (function(){ -Synchronousfile (Cache.join (', ') ) ); + cleartimeout (timeisnotup); -Timeisnotup =NULL; +Cache.length = 0; A}, 2000 ); at }; - } - })(); - - //Customer Act

interface object, everyone is this interface object, but a layer of layers, constantly called.The execution process is actually a depth-first search .some notable places to watchThe combined pattern is not a parent-child relationship, but rather a delegate relationship.Scenario: The combination mode is only appropriate when dealing with each leaf object in the list in a consistent manner.SummaryCombining patterns allows us to create the structure of

); for(vari=0,file,files= this. files;file=files[i++]; ) {file.scan (); } }; Folder.prototype.remove=function(){ if(! this. parent) {//the root node or the free node outside the tree return; } for(varFiles = this. parent.files,l = files.length;l>=0; l--){ varFile =files[l]; if(file = = this) {files.splice (l,1); } } }; varFile =function(name) { this. Name =name; this. Parent =NULL; }; File.prototype.add=function(){ Throw

, and the leaf node object gives real feedback on the message.In strategy mode 3, the context does not have the ability to execute the algorithm, but instead delegates this responsibility to a policy object. Each policy object is responsible for the algorithm that has been encapsulated inside the object. When we issue a "computed" message to these policy objects, they return their respective computed results.1. See chapter 9th, "Command mode" 2. See chapter 10th, "Combinatorial Mode" 3. See chap

, and the leaf node object gives real feedback on the message.In strategy mode 3, the context does not have the ability to execute the algorithm, but instead delegates this responsibility to a policy object. Each policy object is responsible for the algorithm that has been encapsulated inside the object. When we issue a "computed" message to these policy objects, they return their respective computed results.1. See chapter 9th, "Command mode", 2. See chapter 10th, "Combination mode" 3. See chapt