jasig cas

The Memcached::cas (check and set) uses optimistic locking to avoid overwriting modification issues that may occur when concurrent access occurs.Returns TRUE when successful, or on Failure FALSE . Memcached::getresultcode () Memcached::RES_DATA_EXISTS will return if the element is attempted to be stored and found to be modified by another client after the client's last fetch. The following are examples of using do,while structures and

The underlying implementation of CAs in Java Atomic classFrom Java to C + + to the assembly, the underlying principles of CAs are explained in depth.Before introducing the principle, start with a demoTake the Atomicboolean class as an example. Let's start with a demo that calls CAs.The main thread in the For statement CAS is busy looping until the

Recently in the project because to prevent concurrency, need to use PHP memcached extension, memcached Extension support CAS protocol, but memcache extension is not supported. When installing memcached, there is no such extension in Windows, and in order to keep the code consistent, a class that supports both Memcached and Memcache is written, so there is no need to worry about inconsistencies between production and native development code. (Note: The

Label:Basic configuration reference prior to the essay http://www.cnblogs.com/rocky-fang/p/5354947.html 1. Tomcat-cas Modify Configuration 1.1 Find the Deployerconfigcontext.xml under D:\test\sso\tomcat-cas\webapps\cas\WEB-INF, modify the following: Comment out Increase BeanID= "DataSource"class= "Com.mchange.v2.c3p0.ComboPooledDataSource"P:driverclass

Address: http://www.cnblogs.com/zhenyulu/archive/2013/01/22/2870838.html Due to the need for information system integration, CAS has recently been studied. I have found a lot of information on the Internet, many of which are for the Java platform and few for it. net client articles tend to describe one-sidedly a certain aspect. Many problems will be encountered, especially the "redirection loop" issue. There are various online solutions, the problem

CAS atomic Operations--compare Set, or Compare Swap, now almost all CPU instructions support CAS atomic operations, X86 corresponding to CMPXCHG assembly instructions.You should remember the concept of "atomic manipulation" inside the operating system, where an operation is atomic (atomic), and if the upper layer of this operation is not able to find its internal implementation and structure. An atomic op

This article is mainly for user-submitted user name and password authentication. The process is relatively simple, but we are learning more about his design ideas.In the previous article, we generated the TGT in the Submit method in Authenticationviaformaction byString temptgt= This.centralAuthenticationService.createTicketGrantingTicket (credentials);method to generate the.In this method, the parameter credentials is the encapsulation of the authentication information submitted by the user, the

A few days ago, I accidentally wrote previously written to test Atomicinteger and synchronized self-enhanced performance code ran a bit, unexpectedly found Atomicinteger performance than synchronized better, after some reason to find, with the following findings:In jdk1.7, the getandincrement of Atomicinteger is this:public final int getandincrement () {for (;;) {int current = Get (); int next = current + 1; if (Compareandset (current, next)) return current;} public final boolean compareandset (

-write 3 operations).3, AtomicC++11 brings us atomic a series of atomic manipulation classes that provide a way to ensure atomicity. These methods are not re-divided, and when you get the values of these variables, you always get the pre-modified or modified values, and you don't get the intermediate values during the modification.These classes disable copy constructors because atomic reads and Atomic writes are 2 independent atomic operations, and there is no guarantee that 2 separate operation

What is CAsCAS: Full name compare and swap, literally: "Compare and Exchange", a CAS involves the following actions:we assume that the original data in memory V, the old expected value A, needs to be modified by the new value B. 1. Compare whether A and V are equal. (comparison)2. If the comparison is equal, write B to V. (Exchange)3. Returns whether the operation was successful.When multiple threads perform CAS