java singleton example

Originally reprinted a blog about the singleton modehttp://blog.csdn.net/u011700281/article/details/21951795Now due to the implementation of some managers (such as mysq the Connection Manager, Redis Connection Manager, and Config Connection manager), often used in singleton mode, but the company's singleton mode of implementation of a lot of ways, and then summed

Singleton design ensures that each class has only one instance and provides a global access point for this instance. Unlike static members in the tool class, the singleton class is generally used to save application state data, which may be accessed or modified in all parts of the application. Several implementation methods of Singleton mode. [

memory error exists when the class class of an instance to judge, if not instantiated, and return the object handle, if any, directly return the object handleAt this point, the complete code looks like this: 1 The execution result of the above code:Database name //$A->getdbname (); Database name //$B->getdbname ();Database name //$C->getdbname ();That is, the object a,b,c is actually using the same object instance, accessing the same piece of memory areaSo, even if unset ($A), objects B and C

Java Singleton mode (thread security, high efficiency, dual judgment), high java EfficiencyThis method avoids the thread lock when obtaining the single benefit, resulting in slow access to this method,Likewise, this method prevents multiple instances from being generated when multiple threads are built.High Efficiency and thread security.Public class TestInstance

A. Features: ① Singleton class can have only one instance ② Singleton classes must create their own unique instances themselves ③ Singleton class must provide this instance to all other objects Two. Implementation method: ① a hungry man type public class singleton1{Private Singleton1 ();private static Singleton1 single=new Singleton1 ();public static final Single

Php Redis function usage example summary [with a php connection to redis Singleton class], redisphp This example summarizes the usage of php Redis functions. We will share this with you for your reference. The details are as follows: I have been using Redis with PHP all the time, but I always feel insecure. I just want to use this time to get it in one breath,I t

, synchronization (synchronized keyword) is used for static factory methods to process multi-threaded environments.From the perspective of resource utilization, the lazy style is slightly better; from the perspective of speed and reflection time, the hungry style is better.Ele. Me Khan Singleton class can be implemented in java, but it is not easy to implement in c ++, because static initialization does not

maintains, and the OS puts a handle to the event notification that the I/O operation has completed)7 if((M_HIOCP = CreateIoCompletionPort (INVALID_HANDLE_VALUE, NULL, NULL,0)) ==NULL)8 ;9 //creates a worker thread to handle the completion of a port message.TenM_hworkerthread = CreateThread (NULL,0, Workthread, (LPVOID) This,0, M_workerthreadid); One }; A~IOCP (); - Private: - Staticiocp*m_instance; the Public: - Staticiocp*Instance () - {

The singleton pattern is primarily used for database connections, ensuring that a database class has only one instance, and provides this instance to the entire system. This prevents the new operation from consuming resources while avoiding too many connection information in the database. The main points are three: 1. Must have only one instance. 2. This instance must be created automatically. 3. This example