rule engine java

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This article explainsJ2EE ApplicationAnd describes how to develop a simple rule engine for a popular spring framework. This article requires readersSpringHave a basic understanding.Any larger software project contains many things called business logic. The exact description of the business logic is still controversial. In a large amount of code generated for typical applications, fragmented code is everywhe

Plugin:http://download.jboss.org/drools/release/1, open the corresponding version of the file, select the Red two compressed package download, other if necessary, you can choose:2, will download the compressed package decompression, this side put in the E:\tools\drools directory, open eclipse,help->install New software->add, select e:/tools/drools/ droolsjbpm-tools-distribution-5.6.0.final/binaries/org.drools.updatesite/directory, name customization, such as plugin installation need to downloa

instances: new, this, super, instanceof Keyword used for exception handling: try, catch, finally, throw, throws Keyword used for the package: package, import Other modifier keywords: native, strictfp, transient, volatile, assert Ii. identifier:The string sequence used for naming variables, methods, classes, and other elements in Java is called an identifier (any name that you can start with is called an identifier)

Detailed In this paper, the Java Rules Engine and its API (JSR-94) and related implementation are described in detail, the architecture and API application of the detailed description, and point out the Java Rules Engine, rule language, JSR-94 and the relationship between th

a fully or partially matched object requires memory, it provides the characteristics of speed and scalability. When all the conditions of a rule are fulfilled, this is the endFull match. Only part of the condition is satisfied, which is a partial match. (I think the engine has its own memory in each node to store the objects that meet that node's condition, which causes if an object is an exact match, that

situation * if the random number level in 100,000 will still appear one A hundred thousand of thousands of hundreds of * if the random number level in 10 will still appear a few more than 10 points of the situation * * to complete processing, only need to determine the total number of random numbers, and then judge the value of I for the first few special treatment can ~ ~*/ if("One". Equals (flag) "ten". Equals (Flag2) i = = 10){ returnFlag2; } //return value + posit

which the second and third operands are promoted. After understanding the above rules, re-analyze the code: Output 1, 65535 is the maximum value of int, x is a char type, conforms to rule 2, the output type is char; The output 2,65536 is a long type, conforms to rule 3, and the output type is the promoted long; Output 3, although I is a value of type int, but I is not a constant is

nothing to match, and the second group matches the entire string. Look back and analyze the regular expression. In fact, when the regular engine resolves to zone A, it has started to perform the forward-looking work in area B. This time it is found that when the A zone is null, the match succeeds ——. * Originally allowed to match the null character, the forward-looking conditions are satisfied, the a area is followed by a "2009" string, rather than r

Suppose you are the manager of a supermarket, you will want to understand the customer's shopping habits. You'll want to know what customers might buy at one time in the shopping, so you can arrange the shelves to make a bigger profit. This is the Association Rules (Association Rule). Its manifestations are as follows:bread⇒milk[support=10%;confidence=60%] Bread\rightarrow milk [support=10\%; confidence=60\%] The Support degree (support) and Confid

block is that the variable must be synchronized back to the main memory species (execute store, write operation) before performing a unlock operation on a variable. order (ordering) The problem of order we said in the top of the hardware, the CPU will adjust the order of instruction, the same Java virtual machine will also adjust the bytecode sequence, but this adjustment in the single line Chengri not perceived, unless in the multithreaded program,

The description of the Java rules described in this article is divided into three main levels. The intermediate level is usually used for development, and other rules will be written in the future. Following these rules can improve the program efficiency and make the code more readable.(1) disable the input or output Resources in the finally method.If the input or output stream is defined in the method body, you need to disable it in finally.The follo

{ - Break; the } the}//Judging the right the for(PosX = x-1, PosY = y + 1; PosX > 0 posY ) {94 if(Board[posx][posy] = =color) { thecount++; the if(Count >= 5) { the return true;98 } About}Else { - Break;101 }102 }103 return false;104}Iv. Follow-up1, this algorithm principle is also very simple, but more than all the Ergodic method to optimize a lot,

(ResourceFactory.newClassPathResource("rules/ResumeRule.drl"), ResourceType.DRL);kbuilder.add(ResourceFactory.newClassPathResource("rules/BonusRule.drl"), ResourceType.DRL);kbuilder.add(ResourceFactory.newClassPathResource("rules/AwardPunish.drl"), ResourceType.DRL); kbuilder.add(ResourceFactory.newClassPathResource("rules/TotalRule.drl"), ResourceType.DRL);kbuilder.add(ResourceFactory.newClassPathResource("rules/salary.rf"), ResourceType.DRF);KnowledgeBuilderErrors errors = kbuilder.getError

object type, but if a parent class is too many subclasses, this kind of judgment is very cumbersome * How to design the parent class? * 1. The parent class is typically designed as an abstract class or interface, where the interface is preferred, and the abstract class * 2 is considered if the interface is not satisfied. A specific class does not inherit another concrete class as much as possible, and the benefit is that there is no need to check whether the object is a parent class object*//**

Collection:Java supports three main types:1. Rule set (SET)Used to store a set of non-repeating elements2. Linear table (list)Used to store an ordered collection of elements3. Queuing (queue)A queue in the same data structure that stores the object in FIFO modeNote: All interfaces and classes in the Java collection framework are stored in the Java.util packageSetSet includes:1. Hash set HashSet2. Chain Hash

The rule mode is the behavior mode of the object. It is intended to encapsulate an algorithm into an independent class with a common interface for mutual replacement. The policy mode allows the algorithm to change without affecting the client.________________________________________Structure of Rule ModePolicy mode encapsulates algorithms and separates the responsibility for using algorithms from the algori

, and it takes time to refresh the data to main memory. It is assumed that the x=0 is normal in accordance with A=1;x=b;b=1;y=a, although A=1 was executed before Y=a, but because the thread one did not have time to write the data 1 back to main memory after the a=1 was completed (this time the data is inside the stack of the thread a), The data A that thread B gets from main memory may still be 0 (obviously an out-of-date data, but it is possible), so a data error occurs.The result of the data i

Atitit. GUI picture non-rule button and dynamic picture switch Implementation Mode Summary java. NET C # C + + web HTML JS1. Summary of the effect of the Picture button 11.1. Button picture is automatically scaled. 11.2. Do not frame, if you use a custom picture to make a button background can be set to false. 21.3. Shaped Button 21.4. Do not draw focus 21.5. Icons when the mouse is over 21.6. Icon 2 When s

Java Open Source Forum system http://javabbs.javaz.cn Project Address:http://www.freeteam.cn/ Integration Rule Management Manage the integral processing rules for members ' operations. Integration Rule Management Click the integration rule to enter from the left Management menu. Add an integration