Chapter 6 ReentrantLock source code parsing 2 -- release Lock unlock (), reentrantlock2 --
The most common method:
Int a = 12; // Note: This is usually set to a class variable, for example, the segment lock in the Segement and the global lock final ReentrantLock lock in the copyOnWriteArrayList = new ReentrantLock (); lock. lock (); // get the lock try {a ++; // business logic} catch (Exception e) {} finall
Go to. NET Architecture Design-Chapter 6-service layer design (Part 2)
The previous article introduced some basic knowledge of the service layer and briefly introduced the knowledge of SOA. This article mainly introduces some modes that can be used in the service layer.
This topic is as follows:
Fa C ade Mode
Document Message and Request-Reponse Modes
Reservation Mode
Idempotent Mode
Fa C adeDesign
1. The constructor is also a general function , and the following creates a constructor.var person=function(name,age,job) { this. name=name; this. age= age; this. job=job; this. sayname=function() { Console.log (this. Name); } }(1) Call by using the constructor function1 var person=New person ("xiaoming", +, "Doctor"); 2 Person.sayname (); // xiaoming(2
MealCommand ($ cook ); $ drinkCommand = new DrinkCommand ($ cook); $ control-> addCommand ($ mealCommand, $ drinkCommand); $ control-> callMeal (); $ control-> callDrink ();
III. usage principles:
1. refine the business process according to the business process. Abstract step by step until 'right '.
2. pay attention to the classification of duties.
Copyright Disclaimer: This article is an original article by the blogger and cannot be reproduced wit
New Feature 2 of JDK 6: jaing between objects and XML using jaxb2
Jaxb is short for Java architecture for XML binding. It can convert a Java object into XML format, and vice versa. We call the ORM ing between objects and relational databases An ORM. In fact, we can also call the oxing between objects and XML an oxm (object XML mapping ). originally, jaxb was part of Java ee. In jdk6, sun put it in Java SE,
Strategy 1Hair: Bear. BrownCoat: modern power. WhiteDownload: Crush story BlueSo: Student cotton soShoes: tongqu.comAccessories: square towel, blue + black and white wristbandsStrategy 2Hair: QianfengCoat: sexy. CoatBottom: FearlessCoat: inluoSo: FoamShoes: ordinary canvas shoesHeadwear: Bow headwear. PowderHand: black and white wrist strapStrategy 3Hair: music Princess (2-8 female probability loss)Coat: Carbonated drinks (Mall 3850)Coat: Sailor coat
Install Seafile 2 in CentOS 6
Install Seafile in CentOS 6.4 _ 64 using Apahce and SQLite.
1. Prepare the environment1.1 centos6.4 _ 64 minimal installationYum-y install httpd # After deploying apache, refer to the https://github.com/haiwen/seafile/wiki/Deploy-Seafile-with-apacheYum-y install python-setuptools python-simplejson python-imaging sqlite3 # The default value is python2.6.Yum-y install apr-devel h
Chapter 6 JVM garbage collector (2) jvm garbage collection
The previous chapter records several common garbage collectors. For details, see chapter 5 JVM garbage collector (1).
1. G1
Note:
From the Perspective, compared with CMS, G1 is different only in the final "filter and recycle" section (CMS is a concurrent cleanup). In fact, the overall heap memory division of the G1 recycler is different from tha
.
The role of-n
A \string: Append a new line after the specified line
I usage, format I \string: Adds a new line before the specified line, with the contents of String
R file: Adds the specified file contents to the line that matches the criteria
W File: Saves content in the specified range to the specified file
S: Find and replace
The default is to replace only the string that matches the first companion pattern in each row
Format
two fork tree in the first k number of Layer nodesRecursive solution:(1) If the binary tree is empty or k(2) If the binary tree is not empty and k==1, return 1(3) If the binary tree is not empty and k>1, the number of nodes in the record k-1 layer and the number of nodes in the right subtree k-1 layer are returned.The code is as follows:int Getnodenumkthlevel (Binarytreenode *proot, int k){if (proot = = NULL | | K return 0;if (k = = 1)return 1;int num
class is run first, but its constructor is linked to the constructor of the base class, so the constructor for the base class is actually first run.3. If the constructor of the base class is not written in the constructor of the inheriting class, the compilation will fail because the compiler will link to the default base class constructor by default, but this function does not exist.4. The order of execution is independent of the order of writing, and the constructor of the base class is alway
Use the design mode to solidify your C # Program (6-2)
Design Patterns: Solidify Your C # Application Architecture with Design Patterns Chinese edition (Part 2)Author: Samir BajajTranslator: glory
State. h# Include "stdafx. h ";Class State;Class VendingMachine;Class Start;Class Five;Class Ten;Class internal tee;Class Twenty;Class State{Public:Virtual void AddNick
have an empty page.Let's add two simple fields- pagetitle (type = textstring) and bodyText (type Rich Text Editor). If you don't know how to add a field, you can create it by following the instructions for creating the document type for the master page. Then connect these fields-if this is not your second nature, you can edit the template under homepage. "ContactUs Generic Properties (Common attributes)""ContactUs Template with Data fields"Now add something Content > Homepage node > Contact U
highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 /**////2///Add the readtoend method to read the characters of the entire stream.3///4///Returns the read character. 5 Public Override String Readtoend () 6 { 7 String STR; 8 If ( This . S = Null ) 9 {10ReturnString. Empty;//If it is null, the error is returned here.11} 12
Dynamics CRM 2015 New Feature (6): Bussiness Flow Contidtion Branche (2), dynamicscrm2015In the previous article, we discussed some configurable Feature of Business Flow. Let's take a look at the programmable Feature in Business Flow. The new system provides some programming APIs for us. In Dynamics CRM 2013, we still cannot program BF. We believe that through these Feature, we can develop more agile syste
6-2 Single Linked list element positioning (12 points)
It is required to find a node in the list that has the value x in the First data field, and return the bit order of the node. L is a single linked list of leading nodes, function listlocate_l (linklist L, Elemtype x) requires a node in the list to find the first data field value x, returns its bit order (starting from 1), and returns 0 if it is not fou
to the Unknown (DoS with unexpected revert)
This is vulnerability appeared in the King of the Ether Smart contract.
In this case, a attacker ' s contract could the claim leadership by sending enough ether to the insecure. Then, the transactions of another player who would attempt to claim leadership would the throw due to the above Ppet.
Although a simple attack, this causes a permanent denial for service to the contract rendering it useless. This can is found in the Ponzi scheme contracts that
A while ago in the development of a STRUTS2 prototype SCM project, with Struts 2+hibernate development. Once again encountered the conflict problem of Struts 2+JDK 6.
Error info: Illegal Access:this Web application instance has been stopped. Could not load org.xml.sax.SAXException. The eventual following stack trace is caused by a error thrown for debugging purp
conflict will be prompted when saving. Verification Success!Create a ViewSelect the database, right-click the View node, select New ViewIn the Add Table window, click on the Product table, click Add, the Query window appears a view of the product table, and then click Close.Then the query window click need to show the "Product Name", "brand", "Price", click the Execute button, you can display the table information in the bottom window, the field is checked.Finally, save the view with the name "
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