Functional reactive-talk 20170301-001

1. prepare for… Functional-Reactive …with Core Java 8/9

2. @SvenRuppert has been coding java since 1996 2

3. @SvenRuppert has been coding java since 1996 Projects in the ﬁeld of: •Automobile-industry •Energy •Finance / Leasing •Space- Satellit- •Government / UN / World-bank Where? •Europe •Asia - from India up to Malaysia 2

4. Small AddOns based on Java8 @SvenRuppert

5. 4 @SvenRuppertJava8 - Optional<T>

10. 4 @SvenRuppertJava8 - Optional<T> Optional - [ Int, Double, Long ]

11. 5 @SvenRuppertJava8 - Functional Interfaces

25. 9 @SvenRuppertJava9 - Functional Interfaces Java9 - JEP213

26. Functions how use Functions… @SvenRuppert

27. Functions - Java8 11 @SvenRuppert

56. Refactoring example based on Java8 @SvenRuppert

57. 19 @SvenRuppertJava8 - Functional Interfaces - Example typical legacy implementation

58. 20 @SvenRuppertJava8 - Functional Interfaces - Example typical legacy implementation

59. 21 @SvenRuppertJava8 - Functional Interfaces - Example

79. 26 @SvenRuppertJava8 - Functional Interfaces - Example Sourcecode is on github

80. 26 @SvenRuppertJava8 - Functional Interfaces - Example Sourcecode is on github

81. Pattern in Java 8/9 how pattern will change… @SvenRuppert

82. Virtual Proxy 28 @SvenRuppert

83. Virtual Proxy 28 @SvenRuppert public class ServiceProxy implements Service {  private Service service = new ServiceImpl();  public String work(String txt) { return service.work(txt); }  }

84. Virtual Proxy 28 @SvenRuppert public class ServiceProxy implements Service {  private Service service = new ServiceImpl();  public String work(String txt) { return service.work(txt); }  } What could we change now ?

85. Virtual Proxy 28 @SvenRuppert public class ServiceProxy implements Service {  private Service service = new ServiceImpl();  public String work(String txt) { return service.work(txt); }  } What could we change now ? Virtual Proxy: create the Delegator later

86. Virtual Proxy 28 @SvenRuppert public class ServiceProxy implements Service {  private Service service = new ServiceImpl();  public String work(String txt) { return service.work(txt); }  } What could we change now ? Virtual Proxy: create the Delegator later public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }  return service.work(txt);  }  }

89. Virtual Proxy 29 @SvenRuppert public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }   return service.work(txt);  }  }

90. Virtual Proxy 29 @SvenRuppert public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }   return service.work(txt);  }  }

91. Virtual Proxy 29 @SvenRuppert public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }   return service.work(txt);  }  } This is NOT ThreadSafe

92. Virtual Proxy 29 @SvenRuppert public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }   return service.work(txt);  }  } This is NOT ThreadSafe

93. Virtual Proxy 29 @SvenRuppert public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }   return service.work(txt);  }  } This is NOT ThreadSafe ﬁxed decision for an implementation

94. Virtual Proxy 29 @SvenRuppert public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }   return service.work(txt);  }  } This is NOT ThreadSafe ﬁxed decision for an implementation

95. Virtual Proxy 29 @SvenRuppert public class VirtualService implements Service {  private Service service = null;  public String work(String txt) {  if(service == null) { service = new ServiceImpl(); }   return service.work(txt);  }  } This is NOT ThreadSafe ﬁxed decision for an implementation how to combine it with a FactoryPattern ?

96. Virtual Proxy 30 @SvenRuppert if(service == null) { service = new ServiceImpl(); } 

97. Virtual Proxy 30 @SvenRuppert if(service == null) { service = new ServiceImpl(); } 

98. Virtual Proxy 30 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public interface ServiceFactory {  Service createInstance();  }

99. Virtual Proxy 30 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public interface ServiceFactory {  Service createInstance();  }

100. Virtual Proxy 30 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public interface ServiceFactory {  Service createInstance();  } public interface ServiceStrategyFactory {  Service realSubject(ServiceFactory factory);  }

101. Virtual Proxy - Not - ThreadSafe 31 @SvenRuppert if(service == null) { service = new ServiceImpl(); } 

103. Virtual Proxy - Not - ThreadSafe 31 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  private ServiceFactory serviceFactory = ServiceImpl::new;

104. Virtual Proxy - Not - ThreadSafe 31 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  private ServiceFactory serviceFactory = ServiceImpl::new;

105. Virtual Proxy - Not - ThreadSafe 31 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceStrategyFactoryImpl implements ServiceStrategyFactory {  Service realSubject;  public Service realSubject(ﬁnal ServiceFactory factory) {  if (realSubject == null) {  realSubject = factory.createInstance();  }  return realSubject;  }  } private ServiceFactory serviceFactory = ServiceImpl::new;

107. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service {

108. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new;

109. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl();

110. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl(); public String work(String txt) {

111. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl(); public String work(String txt) { }  }

112. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl(); public String work(String txt) { return }  }

113. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl(); public String work(String txt) { return strategyFactory }  }

114. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl(); public String work(String txt) { return strategyFactory .realSubject( }  }

115. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl(); public String work(String txt) { return strategyFactory .realSubject(serviceFactory }  }

116. Virtual Proxy - Not - ThreadSafe 32 @SvenRuppert if(service == null) { service = new ServiceImpl(); }  public class ServiceProxy implements Service { private ServiceFactory serviceFactory = ServiceImpl::new; private ServiceStrategyFactory strategyFactory = new ServiceStrategyFactoryImpl(); public String work(String txt) { return strategyFactory .realSubject(serviceFactory).work(txt); }  }

117. Virtual Proxy - Show some code…. 33 @SvenRuppert

146. Interpreter - pre Java8 43 @SvenRuppert

157. Interpreter - Java8 - Java9 47 @SvenRuppert

160. Interpreter - Java8 - Java9 48 @SvenRuppert Main Idea - DataStructure to Function

165. Memoizing pure functional behavior - show Source code @SvenRuppert

166. @SvenRuppert Memoizing @SvenRuppert

177. Reactive stuff how use Functions… async… @SvenRuppert

178. Observer 63 @SvenRuppert

183. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture

184. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process

185. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process Thread

186. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process Thread Fiber

187. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process Thread Fiber

188. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process Thread Fiber CompletionStage

191. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process Thread Fiber CompletionStage CompletionStage

192. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process Thread Fiber CompletionStage CompletionStage

193. 64 @SvenRuppertJava8 - Concurrency - CompletableFuture Process Thread Fiber CompletionStage CompletionStage CompletionStage

196. 66 @SvenRuppertJava8 - Concurrency - CompletableFuture Value A

197. 66 @SvenRuppertJava8 - Concurrency - CompletableFuture Value A Value B

200. 66 @SvenRuppertJava8 - Concurrency - CompletableFuture Operator 1 Value A Value B

201. 66 @SvenRuppertJava8 - Concurrency - CompletableFuture Operator 1 Value A Value B

202. 66 @SvenRuppertJava8 - Concurrency - CompletableFuture Operator 1 Value A Operator 2a Value B

203. 66 @SvenRuppertJava8 - Concurrency - CompletableFuture Operator 1 Value A Operator 2a Value B Value C

206. 66 @SvenRuppertJava8 - Concurrency - CompletableFuture Operator 1 Value A Operator 2a Result Value B Value C

230. 75 @SvenRuppertJava8 - Concurrency - CompletableFuture Operator 1 Value A Operator 2a Result Value B Value C

231. Java 9 some nice news… @SvenRuppert

232. Java9 - Optional 77 @SvenRuppert

237. Java9 - JEP266 78 @SvenRuppert

238. Java9 - JEP266 78 @SvenRuppert we got Publisher / Subscriber

239. Java9 - JEP266 78 @SvenRuppert we got Publisher / Subscriber

240. Summary 79 @SvenRuppert places to read more about it

241. Summary 79 @SvenRuppert places to read more about it www.functional-reactive.org

242. Summary 79 @SvenRuppert places to read more about it www.functional-reactive.org

243. Summary 79 @SvenRuppert places to read more about it www.functional-reactive.org www.java-9.org

244. Summary 80 @SvenRuppert Now it is time to relax again ;-)

245. Summary 81 @SvenRuppert please, follow me ;-) @SvenRuppert

246. Summary 81 @SvenRuppert please, follow me ;-) @SvenRuppert Thank You !!!

Functional reactive-talk 20170301-001

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Functional reactive-talk 20170301-001