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Professional Open Source © JBoss Group, 2003. 1 12 September 2015 JBoss: Aspect-Oriented Middleware Aspect Oriented Programming with JBoss 4 AOSD, 2004.

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Presentation on theme: "Professional Open Source © JBoss Group, 2003. 1 12 September 2015 JBoss: Aspect-Oriented Middleware Aspect Oriented Programming with JBoss 4 AOSD, 2004."— Presentation transcript:

1 Professional Open Source © JBoss Group, 2003. 1 12 September 2015 JBoss: Aspect-Oriented Middleware Aspect Oriented Programming with JBoss 4 AOSD, 2004 Bill Burke Chief Architect, JBoss Inc. bill.burke@jboss.com

2 © JBoss Group, 2003. 2 Professional Open Source Overall Agenda  What is AOP?  JBoss AOP framework  Prepackaged Middleware Aspects –Dynamic Aspects –Metadata Driven Aspects

3 © JBoss Group, 2003. 3 Professional Open Source What is it?  Orthogonal to class hierarchies  Cross-cutting functionality  Functionality spanning across class hierarchies  Aspects are generic services that can be applied across domains  Functionality that is not specific to any particular class CROSS HIERARCHY

4 © JBoss Group, 2003. 4 Professional Open Source What is it NOT?  AOP != OOP  AOP is not better than OOP  AOP compliments OOP  AOPites say  OOP solves 80% of problems well  AOP solves the 20% OOP isn’t good at

5 © JBoss Group, 2003. 5 Professional Open Source Cross-cutting Concern public class BankAccount { public void withdraw(double amount) { long start = System.currentTimeMillis(); try { Connection con = datasource.getConnection(); con.execute…(“select … blah blah”); this.balance -= amount; con.commit(); } finally { long totalTime = System.currentTimeMillis() - start; System.out.println(“withdraw took “ + start); } public class BankAccount { public void withdraw(double amount) { long start = System.currentTimeMillis(); try { Connection con = datasource.getConnection(); con.execute…(“select … blah blah”); this.balance -= amount; con.commit(); } finally { long totalTime = System.currentTimeMillis() - start; System.out.println(“withdraw took “ + start); }

6 © JBoss Group, 2003. 6 Professional Open Source Cross-cutting Concern public class BankAccount { public void withdraw(double amount) { long start = System.currentTimeMillis(); try { Connection con = datasource.getConnection(); con.execute…(“select … blah blah”); this.balance -= amount; con.commit(); } finally { long totalTime = System.currentTimeMillis() - start; System.out.println(“withdraw took “ + totalTime); } public class BankAccount { public void withdraw(double amount) { long start = System.currentTimeMillis(); try { Connection con = datasource.getConnection(); con.execute…(“select … blah blah”); this.balance -= amount; con.commit(); } finally { long totalTime = System.currentTimeMillis() - start; System.out.println(“withdraw took “ + totalTime); }

7 © JBoss Group, 2003. 7 Professional Open Source What’s wrong?  Difficult to turn metrics off/on –Have to modify every method you want it in  Bloated code, harder to read  Metrics doesn’t belong  To expand metrics functionality, need to modify lots of code.

8 © JBoss Group, 2003. 8 Professional Open Source Where does AOP come in?  Can encapsulate metrics functionality in one place  Remove metrics from polluting your code  Expression language for defining where you want an aspect to go

9 © JBoss Group, 2003. 9 Professional Open Source Terms  Advice –Behavior you want to weave into your Java classes (metrics code)  Aspect –Java class that encapsulates advices  Pointcut –Expression specifying a point within Java code –i.e. a method call, field access, construction  Joinpoint –Actual point a pointcut matches on –A method execution –A field access  Invocation –JBoss AOP’s runtime encapsulation of a pointcut

10 © JBoss Group, 2003. 10 Professional Open Source Aspects  Advice is the behavior you want to add  Aspects encapsulate this behavior public class MetricsAspect { public Object profile(Invocation invocation) throws Throwable { long start = System.currentTimeMillis(); try { return invoke.invokeNext(); } finally { long totalTime = System.currentTimeMillis() - start; System.out.println(“invocation took “ + totalTime); } public class MetricsAspect { public Object profile(Invocation invocation) throws Throwable { long start = System.currentTimeMillis(); try { return invoke.invokeNext(); } finally { long totalTime = System.currentTimeMillis() - start; System.out.println(“invocation took “ + totalTime); } Advice

11 © JBoss Group, 2003. 11 Professional Open Source Pointcuts and Bindings  Apply the Metrics aspect to our BankAccount class  Pointcut expression defines where we want metrics to be invoked *(..))”> *(..))”>

12 © JBoss Group, 2003. 12 Professional Open Source JBoss AOP Framework  Basic Features: –Execution pointcut definition for fields, constructors and methods –Caller pointcut definition for constructors and methods –Compositional pointcuts through an expression language –Control Flow pointcuts –Interface introductions and mixins – Multiple inheritance with mixins –Load or compile time bytecode enhancements –Doclet integration through QDox –100% pure Java –Available integrated with application server –Can run standalone in any Java program as well

13 © JBoss Group, 2003. 13 Professional Open Source JBoss AOP Framework  Distinguishing Features: –Dynamic API Advice bindings on a per instance basis Metadata bindings on a per instance basis –Hot Deployment of advice bindings at runtime –Metadata facility for JDK 1.4 (JSR-175 like annotations) –Annotation support in pointcut language –Configuration Domains –Runtime GUI management console

14 Professional Open Source © JBoss Group, 2003. 14 12 September 2015 Prepackaged Middleware Aspects Applied AOP

15 © JBoss Group, 2003. 15 Professional Open Source JBoss 4: Pre-packaged Aspects  Middleware, by nature, is cross-cutting  Middleware implemented as aspects allows for: –Smooth, fluid, iterative development –Clean separation between System Architect and Application Developer –Less upfront design decisions  AOP is the natural evolution of middleware  JBoss 4 is Aspect-Oriented Middleware

16 © JBoss Group, 2003. 16 Professional Open Source Iterative Development  Specifications like EJB requires upfront design decisions  AOP provides clean separation from system architecture and application code  Architectural decisions can be made later on in the development process  AOP makes iterative development more fluid

17 © JBoss Group, 2003. 17 Professional Open Source JBoss 4: Pre-packaged Aspects  Annotated aspects: –J2EE a la carte Transaction demarcation Role-based Security –Transactional Locking. Expanded Java “synchronized”  Dynamic AOP –Transactional Objects. Our Transactional Cache –Replicated Objects. Our Distributed Cache –Remoting – choose at runtime, SOAP, RMI, Sockets, IIOP –Clustered Remoting – invocation failover

18 Professional Open Source © JBoss Group, 2003. 18 12 September 2015 Annotated Aspects

19 © JBoss Group, 2003. 19 Professional Open Source Annotations and AOP  Annotations + AOP allows you to extend the Java language  Instead of code generation –Encapsulate middleware as aspects –Apply the middleware through annotations –Let middleware become part of the Java language  Let’s give an example using JBoss AOP –Define a ReadWriteLock

20 © JBoss Group, 2003. 20 Professional Open Source Define Annotation  Define the syntax to our “extension” of the Java language public @interface ReadLocked {} public @interface WriteLocked {} public @interface ReadLocked {} public @interface WriteLocked {}

21 © JBoss Group, 2003. 21 Professional Open Source ReadWriteLock Aspect public class ReadWriteLockAspect { java.util.concurrent.ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); public Object readLock(Invocation invocation) throws Throwable { lock.readLock().lock(); try { return invoke.invokeNext(); } finally { lock.readLock().unlock(); } public Object writeLock(Invocation invocation) throws Throwable { lock.writeLock().lock(); try { return invoke.invokeNext(); } finally { lock.writeLock().unlock(); } public class ReadWriteLockAspect { java.util.concurrent.ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); public Object readLock(Invocation invocation) throws Throwable { lock.readLock().lock(); try { return invoke.invokeNext(); } finally { lock.readLock().unlock(); } public Object writeLock(Invocation invocation) throws Throwable { lock.writeLock().lock(); try { return invoke.invokeNext(); } finally { lock.writeLock().unlock(); } Advice

22 © JBoss Group, 2003. 22 Professional Open Source Pointcuts and Bindings  Specify pointcuts that triggers the application of the ReadWriteLockAspect  @ReadLocked triggers readLock advice  @WriteLocked triggers writeLock advice @org.jboss.ReadLocked(..))”> @org.jboss.WriteLocked(..))”> @org.jboss.ReadLocked(..))”> @org.jboss.WriteLocked(..))”>

23 © JBoss Group, 2003. 23 Professional Open Source Use our Language “Extension”  Use our new addition to the Java language: @ReadLocked, @WriteLocked public class BankAccount { @ReadLocked Data pullAccountData() {…} @WriteLocked void updateAccountData() {…} } public class BankAccount { @ReadLocked Data pullAccountData() {…} @WriteLocked void updateAccountData() {…} }

24 Professional Open Source © JBoss Group, 2003. 24 12 September 2015 JBoss Packaged Annotated Aspects

25 © JBoss Group, 2003. 25 Professional Open Source Asynchronous Invocations  Asynchronous Aspect –Tag Methods –Invoke them in background –Obtain response asynchronously –In-VM only –Working on Remote asynchronous invocations

26 © JBoss Group, 2003. 26 Professional Open Source Asynchronous Invocations @asynchronous public int somepojoMethod() { … } { POJO pojo = new POJO(); AsynchronousFacade façade = (AsynchronousFacade)pojo; pojo.somepojoMethod(); // happens in background AsynchronousResponse response = facade.waitForResponse(); int rtn = ((Integer)response.getResponse()).intValue(); } @asynchronous public int somepojoMethod() { … } { POJO pojo = new POJO(); AsynchronousFacade façade = (AsynchronousFacade)pojo; pojo.somepojoMethod(); // happens in background AsynchronousResponse response = facade.waitForResponse(); int rtn = ((Integer)response.getResponse()).intValue(); }

27 Professional Open Source © JBoss Group, 2003. 27 12 September 2015 J2EE a la carte

28 © JBoss Group, 2003. 28 Professional Open Source Transaction Demarcation  Transaction demarcation (method, field, constructor)  You can specify transaction boundaries within code  Tags can transparently interact with Transaction Manager –Begin, suspend, commit and rollback transactions –On method, field, or constructor execution  EJB adjectives used to specify transactional behavior –Required, RequiresNew, Supports, Never, NotSupported, Mandatory  Complete control over when a rollback is triggered –i.e. which thrown exceptions cause a rollback

29 © JBoss Group, 2003. 29 Professional Open Source Transaction Demarcation  Annotations or XML metadata can specify annotation @Tx(TxType.REQUIRED) public void somepojoMethod() { … } @Tx(TxType.REQUIRED) public void somepojoMethod() { … } RequiresNew RequiresNew

30 © JBoss Group, 2003. 30 Professional Open Source Transactional Locking  Enhanced Java “synchronized”  Allows you to lock object/class for duration of a transaction  Can specify on any member field or method –Locks object instance  Can specify for any constructor or static method, field –Locks class access

31 © JBoss Group, 2003. 31 Professional Open Source Transactional Locking  Annotations or XML metadata can specify annotation @TxSynchronized public void somepojoMethod() { … } @TxSynchronized public void somepojoMethod() { … }

32 © JBoss Group, 2003. 32 Professional Open Source Roled-based Security  Secured access to any method, field, or constructor  Only users of a certain role allowed to access  Authentication/Authorization integrated with JBoss Security –Various Security Domains (LDAP, RDBMS, SRP, etc…)  Access to username available within other interceptors

33 © JBoss Group, 2003. 33 Professional Open Source Role-Based security XML metadata can specify annotation other allowed someMethod Methods that connect be used excluded other allowed someMethod Methods that connect be used excluded

34 © JBoss Group, 2003. 34 Professional Open Source Role-Based security JDK 5.0 Annotations are usable @SecurityDomain(“other”) public class POJO { @Unchecked public POJO() {} @Exclude public exlucedMethod() {…} @Permissions({“admin”, “manager”}) public void someMethod() {…} @Permissions({“user”}) public static int status; } @SecurityDomain(“other”) public class POJO { @Unchecked public POJO() {} @Exclude public exlucedMethod() {…} @Permissions({“admin”, “manager”}) public void someMethod() {…} @Permissions({“user”}) public static int status; }

35 © JBoss Group, 2003. 35 Professional Open Source Role-based Security  Security information is available within advice/interceptors –Useful if you want to do your own rule-based security import java.security.Principal; public Object invoke(org.jboss.aop.joinpoint.Invocation invocation) throws Throwable { Principal principal = (Principal)invocation.getMetaData("security", "principal"); … } import java.security.Principal; public Object invoke(org.jboss.aop.joinpoint.Invocation invocation) throws Throwable { Principal principal = (Principal)invocation.getMetaData("security", "principal"); … }

36 Professional Open Source © JBoss Group, 2003. 36 12 September 2015 Dynamic AOP

37 © JBoss Group, 2003. 37 Professional Open Source Dynamic AOP  Every AOPized class has an extended interface  At classloading time, bytecode manipulation forces AOP POJOs to implement a standard AOP interface. package org.jboss.aop; Public interface Advised { Advisor _getAdvisor(); InstanceAdvisor _getInstanceAdvisor(); } package org.jboss.aop; Public interface Advised { Advisor _getAdvisor(); InstanceAdvisor _getInstanceAdvisor(); }

38 © JBoss Group, 2003. 38 Professional Open Source Dynamic AOP  Dynamic insertion of interceptors per object instance  Object instance can hold its own metadata package org.jboss.aop; public interface InstanceAdvisor { public SimpleMetaData getMetaData(); public Interceptor[] getInterceptors(); public Interceptor[] getInterceptors(Interceptor[] baseChain); public boolean hasAspects(); public void insertInterceptor(Interceptor interceptor); public void removeInterceptor(String name); public void appendInterceptor(Interceptor interceptor); public void insertInterceptorStack(String stackName); public void removeInterceptorStack(String name); public void appendInterceptorStack(String stackName); } package org.jboss.aop; public interface InstanceAdvisor { public SimpleMetaData getMetaData(); public Interceptor[] getInterceptors(); public Interceptor[] getInterceptors(Interceptor[] baseChain); public boolean hasAspects(); public void insertInterceptor(Interceptor interceptor); public void removeInterceptor(String name); public void appendInterceptor(Interceptor interceptor); public void insertInterceptorStack(String stackName); public void removeInterceptorStack(String name); public void appendInterceptorStack(String stackName); }

39 Professional Open Source © JBoss Group, 2003. 39 12 September 2015 JBoss Remoting

40 © JBoss Group, 2003. 40 Professional Open Source JBossRemoting  Goals –Use POJOs not APIs –No extending of UnicastRemote –No precompilation (rmic) –Protocol independent –Protocol isolation  Features –SOAP, Fact Socket, or RMI protocols available –Clustering: failover, loadbalancing –URL based protocols (SOAP, RMI, FastSocket, etc…) –Remote classloading with any protocol

41 © JBoss Group, 2003. 41 Professional Open Source Remoting  Declare POJO remoted at runtime  URI based protocols (soap, socket, rmi) // Server POJO remote = new POJO("hello"); Dispatcher.singleton.registerTarget(“objName", remote); // Client POJO proxy = (POJO)Remoting.createRemoteProxy(“objName", POJO.class, “soap://localhost:8080"); // Server POJO remote = new POJO("hello"); Dispatcher.singleton.registerTarget(“objName", remote); // Client POJO proxy = (POJO)Remoting.createRemoteProxy(“objName", POJO.class, “soap://localhost:8080");

42 © JBoss Group, 2003. 42 Professional Open Source JBossRemoting  Proxies can be created from a plain Java class. –AOP Framework has a proxy generation utility –Same as java.lang.reflect.Proxy except it works with classes instead of interfaces  Remoting framework can also create proxies using plain old java.lang.reflect.Proxy if you like  Interceptors that handle transaction and security propagation are attached  Can run outside of JBoss application server

43 © JBoss Group, 2003. 43 Professional Open Source Clustered Remoting  Invocation failover with any protocol  Invocation loadbalancing with any protocol  Leverages existing JBoss Clustering  Requires JBoss application server POJO pojo = new POJO("hello"); POJO proxy = (POJO)ClusteredRemoting.registerClusteredObject( “objName", pojo, "DefaultPartition", new RoundRobin(), “socket://localhost:5150"); POJO pojo = new POJO("hello"); POJO proxy = (POJO)ClusteredRemoting.registerClusteredObject( “objName", pojo, "DefaultPartition", new RoundRobin(), “socket://localhost:5150");

44 Professional Open Source © JBoss Group, 2003. 44 12 September 2015 JBossCache Application of Dynamic AOP

45 © JBoss Group, 2003. 45 Professional Open Source Features  AOP and non-AOP –AOP version uses Dynamic API for per instance field interception –Non-AOP can run with plain non-AOPized POJOs  Transactions –All modifications done within TX, replication at TX commit. No replication on rollback  Locking –Access to nodes serialized by locks –Lock acquisition timeouts used for deadlock prevention  Replication –local: in-VM, no replication –repl-async: replication done on separate thread –repl-sync: replication done on user's thread, wait for all acks  All combinations supported –From local/no-tx/no-locking to repl/tx/locking –Ex: repl-async/no-locking/TX

46 © JBoss Group, 2003. 46 Professional Open Source AOP Cache  AOP Cache  POJO inserted into cache –Can become Transactional –Can become Replicated –Depends on Cache Configuration  Goal to have transparent transactional properties  Transparent Replication  No application coding for inserted Objects  Uses AOP Dynamic API and field interception  Requires “prepare” step via

47 © JBoss Group, 2003. 47 Professional Open Source AOP Cache  Work with POJOs public class Person { String name=null; int age=0; Map hobbies=null; Address address=null; Set skills; List languages; public String getName() { return name; } public void setName(String name) { this.name=name; }... } public class Address { String street=null; String city=null; int zip=0; public String getStreet() { return street; } public void setStreet(String street) { this.street=street; }... } public class Address { String street=null; String city=null; int zip=0; public String getStreet() { return street; } public void setStreet(String street) { this.street=street; }... }

48 © JBoss Group, 2003. 48 Professional Open Source Interaction With Cache tree = new TreeCacheAop(); config = new PropertyConfigurator(); // configure tree cache. config.configure(tree, "META-INF/replSync-service.xml"); joe = new Person(); joe.setName("Joe Black"); joe.setAge(31); addr = new Address(); addr.setCity("Sunnyvale"); addr.setStreet("123 Albert Ave"); addr.setZip(94086); joe.setAddress(addr); Use Pojos as Pojos

49 © JBoss Group, 2003. 49 Professional Open Source Interaction With Cache  Joe’s state is automatically transactional and replicated  State replicated, synchronized at transaction commit/rollback tree.start(); // kick start tree cache tree.putObject("/aop/joe", joe); // add aop sanctioned object tx.begin(); joe.setAge(41); joe.getAddress().setZip(95124); tx.commit(); tree.start(); // kick start tree cache tree.putObject("/aop/joe", joe); // add aop sanctioned object tx.begin(); joe.setAge(41); joe.getAddress().setZip(95124); tx.commit();

50 © JBoss Group, 2003. 50 Professional Open Source Interaction with Cache  Any aop “prepared” class retains its reference  Reference to addr is same as reference with joe tx.begin(); addr.setCity(“Santa Clara”); tx.commit(); joe.getAddress.getCity().equals(“Santa Clara”); joe.getAddress() == addr; tx.begin(); addr.setCity(“Santa Clara”); tx.commit(); joe.getAddress.getCity().equals(“Santa Clara”); joe.getAddress() == addr;

51 © JBoss Group, 2003. 51 Professional Open Source Interaction with Cache  System classes do not retain references and cannot be intercepted  Collection classes are the exception (Set, Map, List)  A proxy is created for these  And state is copied around Person monica = new Person(…); Map hobbies = monica.getHobbies(); tree.putObject("/aop/monica", monica); // add aop sanctioned object monica.getHobbies() != hobbies; monica.getHobbies().size() == 0; Tx.begin(); monica.getHobbies().put(“cooking”, “always”); Tx.rollback(); Monica.getHobbies().size() == 0; // state change rolledback Person monica = new Person(…); Map hobbies = monica.getHobbies(); tree.putObject("/aop/monica", monica); // add aop sanctioned object monica.getHobbies() != hobbies; monica.getHobbies().size() == 0; Tx.begin(); monica.getHobbies().put(“cooking”, “always”); Tx.rollback(); Monica.getHobbies().size() == 0; // state change rolledback

52 © JBoss Group, 2003. 52 Professional Open Source JBoss AOP Conclusions  AOP Framework –Hot deployment –Dynamic API –Metadata Integration –Seemless integration with JBoss architecture  Aspect-Oriented Middleware –Pojo based development –Free developers from specifications –Give vendors

53 © JBoss Group, 2003. 53 Professional Open Source JBoss AOP INFO  Link –http://www.jboss.org/products/aop  Discussion on JBoss.org forum or jboss-dev mailing list  Contact –Bill Burke bill@jboss.orgbill@jboss.org

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