1. The proxy class Implementation of Newproxyinstance:1. Get the proxy class, this proxy class is somewhat similar to the subclass of the proxy class. This proxy class has an acceptedThe constructor for Proxy (Invocationhandler
I. Proxy Mode The proxy mode is a common java design mode. It features that the proxy class has the same interface as the delegate class. The proxy class is mainly responsible for preprocessing, filtering, and forwarding messages to the delegate class, and post-processing messages.There is usually an association betwee
In the java design mode, the proxy mode is widely used. For example, when I write a web program and modify the request or response in the filter, the request does not have a set method, in this way, you need to use a new class to implement the HttpServletRequest interface, put the original request into the new class and call the original method for the corresponding method in the new class. Then, the server passes the request to the Servlet so that th
TCP-based Haproxy proxy and TCPHaproxy proxy
HaProxy provides high availability, Server Load balancer, and TCP and HTTP application-based proxy. It supports Virtual Hosts and is a free, fast, and reliable solution. Application to Haproxy is mainly because it is free and is based on TCP and HTTP application proxy.
First
Spring interface proxy, spring interface proxy
1. Question Description:
When you use @ Transactional annotation and @ RequiresPermissions annotation (about shiro) together,
You will find the @ RequiresPermissions annotation donot work, why?
2. Explain:
It's caused by the Proxy Mechanism of Spring, because the Spring framework preference for Interface
60 s allows you to learn the dynamic proxy principle and 60 s the dynamic proxy Principle
I. Why dynamic proxy?
When an object or multiple objects implement the N method, the business needs to add the object and N methods of multiple objects to a common method, for example, there are three methods to add all methods of all objects to the transaction:
Method
1. Proxy: proxy mode 1.1. Overview
L The proxy concept can be understood as: there is an intermediate layer between the starting point and the destination, meaning the proxy. Example: proxy server.
L scenario: There is an image viewing application where each image is large a
Implementation of spring _ aop_proxy AOP static proxy and Spring AOP dynamic proxy
Static proxy Implementation of AOP in Spring:
In our project, there will be log records and permission management and other content unrelated to the business logic. We need to extract these content to a separate module to process them!
The static
When using an existing method, you need to improve or modify the original method. At this time, there are two ways to improve: modify the original method to adapt to the current use method, or use a "third party" method to call the original method, and control the results of the method. The first method obviously violates the principle of "open to extension and disable to modify", and modifications to the original method may blur and diversify the functions of the original class, the second meth
(1). The concept of a forward proxyForward agent, that is, the legendary agent, he works like a springboard, simply said, I am a user, I can not access a website, but I have access to a proxy server, the proxy server, he can access the site I can not access, so I first connected to the proxy server, Tell him I need the content of the inaccessible site, the
clients of the cluster (the other way is LoadBalancer), so TargetportThe port on the pod, the service should proxy traffic to.Targetport well understood that Targetport is the port on the pod, and the data coming from port and Nodeport eventually go through the kube-proxy into the container on the targetport of the back-end pod.Port, Nodeport SummaryIn general, both port and Nodeport are service ports that
First, the server commonly used ports
Each host (hosts) on the Internet has a unique address (IP), but the same host may provide more than one service, such as the FTP service, the WWW service, and so on, so that each service occupies one port of that host.
The common ports used by proxy servers are:
HTTP Proxy: 80/8080/3128/8081/9080
Socks Agent: 1080
FTP Agent: 21
Telnet Agent: 23
Second, how to sea
Virtual Agent Mode-virtual ProxyVirtual proxy mode defers the actual time required for object instantiation. If a proxy object can handle a real object before it needs to work, the real object is not needed for the moment.Pros: The advantage of this approach is that when the application starts, it accelerates application startup because it does not require all objects to be created and loaded.disadvantage:
Linux and Cloud computing--the second phase of Linux Server SetupThe 11th chapter:Agent Proxy Server Erection-squid configuration Reverse ProxyReverse proxy settings[1]ConfigurationSquid.[Email protected] ~]# vim/etc/squid/squid.conf#: Add ( allow all http access )Http_access Allow all# line: Specify the backend Web serverHttp_port Accel Defaultsite=client.example.com# line: Cancel Notes# means [disk cache
Let the software that does not support proxy can also access the internet through proxy (non-VPN) We know that vpn can control all communication software to access the internet through its proxy, then, how can a common proxy implement this function? The software described below allows almost all software based on TCP/I
In Java. lang. the reflect package provides a Proxy class and an InvocationHandler interface. By using this class and interface, you can generate JDK dynamic Proxy class or dynamic Proxy object. proxy provides a static method for creating dynamic Proxy classes and
When it comes to proxy servers, the first thing we can think of is a dedicated Proxy server Web site that, in some cases, speeds up access to the Internet. In fact, in the need to access the external LAN, we can set up the agent, the number of visits to save the page in the cache, thereby "improve" the network speed. More importantly, we can use the proxy server
Design Patterns
----Proxy (
Agent
)
Mode
GOF
:Provides a proxy for other objects to control access to this object. Not like flyweight. Proxy is itself the meaning of the agent. The reason for access control for an object is to use it when we really need it, or some function of the object. In a forum system (such as the very famous "Tianya"), browsing the for
(); void dance ();}Now create a proxy class: Public classStarsproxyImplementsistars{//Save the received proxy object PrivateIstars stars; PublicStarsproxy (Istars stars) { This. Stars =stars; } @Override Public voidSing () {System.out.println ("I was the agent, and I received a singing request. "); Stars.sing (); System.out.println ("Finish the song."); } @Override Public voidDance () {Syste
1, Agent Mode
An agent is a person or an agency acting on behalf of another person or another institution. In some cases, a customer does not want to or cannot directly refer to an object, and the proxy object can act as a mediator before the client and the target object.The proxy mode provides a proxy object to an object, and the
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