new relic java agent

1. What is an agentProxy mode is a common Java design pattern, its characteristic is that the proxy class and the delegate class have the same interface, the proxy class is mainly responsible for the delegate class preprocessing messages, filtering messages, forwarding messages to the delegate class, and post-processing messages.2. What is dynamic proxyWhen the program is running, the proxy instance object is created dynamically using the reflection m

Newunauthorizedexception (); } } ...}And Dbforum is the real implementation of the interface forum, to modify the name of the forum as an example: public class dbforum "implements Forum, cacheable {... public void setName (String name) throws Forumalreadyexistsexception {.... 　　this . Name = name; // Here really saves the new name to the database Savetodb (); .... } ...}All involved in the Forum name modification this event,

proxy object. * Interfaces: Specifies the type of proxy object. Which methods are available in the Proxy proxy object. * H: When invoking the method of a proxy object, how to respond is actually called the Invoke method of Invocationhandler */ proxy = (Arithmeticcalculator) PROXY.NEWP Roxyinstance (loader, interfaces, h); System.out.println (Proxy.getclass () + "" +proxy.hashcode ());//Just to test whether it is the same object return proxy; }}Test code: @Tes

;import Java.lang.reflect.invocationhandler;import java.lang.reflect.Proxy;/ * * * @author sunny */public class Testproxy {public static void main (string[] args) {ITask realtask = new TasKimpl ();Invocationhandler handler = new Dynamicproxy (realtask); ITask Proxytask = (ITask) proxy.newproxyinstance (Realtask.getclass (). getClassLoader (), Realtask.getclass ().Getinterfaces (), handler);Proxytask.setdata

(); Source.method (); Atfer (); } private void Atfer () { System.out.println ("after proxy!"); private void Before () { System.out.println ("before proxy!"); } } Test:public class Proxytest {public static void Main (string[] args) { sourceable Source = new Proxy (); Source.method (); } }Output:Before proxy!The original method!After proxy!Application Scenarios for

The callback invoke method is located in the class * */return proxy.newproxyinstance (Targetobj.getclass (). getClassLoader (), Targetobj.getclass (). Getinterfaces (), this); }/* * (non-Javadoc) Use the Demo sample:/* Dynamic Proxy Demo sample */loghandler Loghandler = new Loghandler (); Usermanager Usermanager = (usermanager) loghandler.newproxyinstance (New Usermanagerimpl ()); UserManager.addUse

();} Agent Mode 1 Import Java.lang.reflect.InvocationHandler; Import Java.lang.reflect.Method; Import Java.lang.reflect.Proxy; public class Proxytest {public static void main (string[] args) {Salecomputer salecomputer = new Computermaker (); Invocationhandler handler = new Saleproxy (salecomputer); Salecomputer proxy = (salecomputer) proxy.newproxyinstance (Sal

() {//Create enhance Object Enhancer enhancer=new enhancer ();//cglib Create agent, Creates a subclass object Enhancer.setsuperclass (Target.getclass ()) on the target object, or the callback object, which is enhanced by the target enhancer.setcallback (this); Enhancer.create ();} Arg3 method for executing the parent class public Object intercept (object arg0, Method Arg1, object[] arg2,methodproxy arg3) t

Etbrowserversioninfo ());//System.out.println ("Device Type:" +useragentinfo.getdevicetype ()); System.out.println ("Browser:" +useragentinfo.getuaname ()); System.out.println ("Type:" +useragentinfo.gettype ()); catch (IOException e) {e.printstacktrace (); } } } Run Result: User-agent information can be viewed from the browser with its own tools: The Chrome browser is used as follows The static block in the program, whic

calcloggingproxy (Icalc obj) {target = obj;}@Overridepublic object invoke (object proxy, Method method, object[] args) throws Throwable {String methodName = Method.getname ();LogSystem.out.println ("Invoke...before--->" +methodname+ "---" +arrays.aslist (args));Execution methodObject result = Method.invoke (Target,args);LogSystem.out.println ("invoke...after---->" +result);return result;}public static Object Factory1 (Icalc target){Gets the class of the object being proxiedClass cls = Target.ge

When we learned about spring, we learned about two of spring's core technologies: IOC and AOP, which are not easy to understand when we learn about AOP, in fact, the dynamic proxy model of Java is what AOP uses, and then we talk about the dynamic proxy mode of java.In the Java Dynamic Agent there are two more important interfaces and classes, respectively, Invoca

Simply put, the proxy pattern is to add a layer of proxy objects between the target object and the Access object, and all the Access objects implement the call to the target object through the proxy object.The proxy object and the target object implement the same interface, and the proxy object invokes the target object, and for the outside, the proxy object can override the target object being called. In this way, the proxy object can add additional logic to normal access, such as caching, perm

This blog is mainly read by a Daniel's blog wrote, the Daniel wrote the database connection pool implementation, looked at his code, suddenly feel very cow. So here I also recorded my own demo, although not advocating the repetition of the wheel, but many times we are in the process of repeating the wheel to improve the technology, so here I repeat the next roundThis blog is mainly about the Java dynamic agent