private $sqlite;
/**
* 构造函数完成对象属性初始化工作
*/
function __construct() {
//连接SQLITE数据库并创建一个对象（$sqlite）存储在属性中以备后用
$this->sqlite = new SQLite3 ( DB_PATH );
}
/**
* 返回本类的一个单例(静态方法)
* @return object 类的实例话对象 如果不存在此类的时候直接new 一个新的空间,如果存在就直接使用原来的. 可以理解是先声明再使用.---->申明可以扩大代码量,但是可以保证多人开发时避免重复定义! 高效节省内存! 1/4耗时浪费!!~ ----》Redis memcache 挭断上下文 有很多都是singleton!!!钩子!!~~~//preg_replace(); preg_match(), ereg()...都会 return false if fails!!!---》OOFLOODing Over Order Flooding! DDOS attack!!!!~~~ (over order flooding)//COE--centralize of excellence 处于中心化流程当中-->Flow code ,subversion ,git ....svn update --accept mine-theirs --force? 碰到conflict之后覆盖 --> SVN commit log !! branch name trunk tag merge conflict....resolve repository server remote client working copy control version system CVS subversion GIT git pull/push github...collaboration development model!!!! tester QA bug tracking system IDEA FTP TORTOISE.....!!! over order flooding....DDOS Attack~~~~ OOPL Object Oriented Programming Language..such as JAVA PHP ect..static method class property destructor parent superclass final abstract interface implementation multiple inheritance polymorphism encapsulation abstraction composition aggregation extend override delegate bind callback event handler closure yield generator iterator trait namespace overload operator late binding lazy loading meta programming reflection 3PL Third Party Library Dependency Injection IOC Spring Framework Hibernate mybatis design pattern MVC active record DAO factory singleton prototype audit logging AOP aspect oriented programming functional reactive programming lambda snippet monkey patching elasticsearch lucene SOLR endeca mapreduce spark hadoop pig hive kafka flume storm zookeeper HDFS bigdata nosql rdbms memory database cache distributed filesystem grid computing cloud computing SAAS PAAS IAAS public network extranet intranet VPN value added services middleware message queue cqrs event sourcing microservice architecture RESTful SOAP WSDL RPC XML XSD XPATH JSON YAML AJAX jQuery NodeJS AngularJS React Native Android iOS WPF ASP dotnet Java web weblogic websphere tomcat apache jsp servlet struts2 springmvc hibernate JSF myfaces primefaces quartz schedule job duration timer trigger locking race condition mutex semaphore spinlock dead lock resource management jmeter load testing scalability throughput latency failover fail back rolling upgrade high availability HA cluster virtual machine hypervisor openstack vagrant docker container image deploy testing automation unit test integration test regression test performance stress profiling benchmark monitoring alert notification syslog fluentd ELK stack logstash etcd zabbix sensu Nagios prometheus grafana influxdb opentsdb ganglia Kafka connect zookeeper connector Redis pubsub rabbitMQ mqtt AMQP stomp activemq concurrency thread pool executor blockingqueu thread safety executorservice volatile synchronized lock reentrant contended java memory model garbage collection heap stack local variable constant pool register memory addressing pointer virtual reference string intern weak strong soft phantom enum annotation jar war ear zip tarball build tool ant maven gradle scm
