Dr Heinz M. Kabutz – Dynamic Proxies in Java

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Of all the things that we could learn this month, why dynamic proxies?

Back in 1996, we could learn the entire Java ecosystem in a week with Bruce Eckel’s “Thinking in Java”.

Fast-forward to 2020 and the volume of information is overwhelming.

Dr Heinz M. Kabutz – Dynamic Proxies in Java course with special price just for you:  $197  $45

Dr Heinz M. Kabutz – Dynamic Proxies in Java

Of all the things that we could learn this month, why dynamic proxies?

Back in 1996, we could learn the entire Java ecosystem in a week with Bruce Eckel’s “Thinking in Java”.

Fast-forward to 2020 and the volume of information is overwhelming.

Java is still quite easy to learn, especially if we focus on the most essential tools. Start with the syntax, then object-orientation, flow control, collections and Java 8 streams. Design patterns hold everything together.

But there is more, much more.

To become a true Java Specialist, we need to also master the underpinnings of this great platform. How else can we develop systems that take advantage of the power of Java?

Dynamic proxies are such a tool. We can save thousands of lines of repetitive code with a single class. By taking a thorough look at how they work, we will recognize good use cases for them in our systems.

Dynamic proxies are not an everyday tool. They may come in handy only half a dozen times in our career. But when they fit, they save us an incredible amount of effort. I once managed to replace over half a million code statements with a single dynamic proxy. Powerful stuff.

This course is for intermediate to advanced Java programmers who want to get to “guru” status. It is not suitable for beginners in Java.

Every section has tough exercises for us to solve, together with walkthroughs.

We hope you enjoy this course as much as I enjoyed creating it for you!

Let the dynamic proxy games begin!

Heinz

Your Instructor

Dr Heinz M. Kabutz

Heinz Kabutz is the author of The Java Specialists’ Newsletter, a publication enjoyed by tens of thousands of Java experts in over 145 countries. His book “Dynamic Proxies (in German)” was #1 Bestseller on Amazon.de in Fachbücher für Informatik for about five minutes until Amazon fixed their algorithm. Thanks to a supportive mother, he has now sold 5 copies.

Heinz’s Java Specialists’ newsletter is filled with amusing anecdotes of life on the Island of Crete. He is a popular speaker at all the best Java conferences around the world, and also at some of the worst. He teaches Java courses in classrooms around the world, where his prime objective is to make absolutely sure that none of his students fall asleep. He is not always successful.

Course Curriculum

Dynamic Proxies in Java
Resources

Exercise files and slides

Dynamic Proxies in Java Mini-Book

Playground files and solved exercises

Welcome

0.1. Why I wrote this book (and course) (3:05)

0.2. Hearty welcome (2:12)

0.3. Course author (1:23)

0.4. Comfort and Learning (1:30)

0.5. How to ask questions (1:25)

0.6. Exercises (1:57)

0.7. Exercises in IntelliJ 2020.1 (or later) (2:12)

0.8. History of dynamic proxies (2:13)

0.9. Big Win (3:10)

0.10. Infrastructure Code (1:01)

0.11. Risk of dynamic proxies (3:22)

0.12. What will we learn? (0:59)

0.13. Java version (1:17)

0.14. Shallow vs deep reflection (2:25)

0.15. Book sample code (1:10)

0.16. How code is modularized (2:28)

0.17. Enjoy! (0:21)

0.18. Exercise 0.1 (2:13)

Design Patterns Cousins

1.0. Design Patterns Cousins (0:36)

1.0.1. Christopher Alexander and Design Patterns (2:42)

1.0.2. What’s in a name? (3:10)

1.0.3. Four Cousins (1:14)

1.1.1. Proxy Intent (1:32)

1.1.2. Proxy Structure (1:20)

1.1.3. Proxy Variations (1:31)

1.1.4. Proxy Exercises (1:04)

1.2.1. Adapter Intent (1:24)

1.2.2. Adapter Structure (2:25)

1.2.3. Object Adapter vs Proxy (1:31)

1.2.4. Adapter Exercises (0:23)

1.3.1. Decorator Intent (3:18)

1.3.2. Decorator Structure (1:18)

1.3.3. Decorator OutputStream (2:27)

1.3.4. OutputStream Objects (1:00)

1.3.5. OutputStream Code Samples (3:24)

1.3.6. Decorator vs Proxy (1:13)

1.3.7. Decorator Exercises (0:32)

1.4.1. Composite Intent (0:50)

1.4.2. Composite Structure (0:59)

1.4.3. Composite vs Proxy (0:25)

1.4.4. Merging and reducing return values (0:24)

1.4.5. (Ab)using dynamic proxies to implement all four cousins (0:16)

1.4.6. Composite Exercises (0:30)

1.5.1. Chain of Responsibility Intent (0:58)

1.5.2. Chain of Responsibility Sample Code (2:31)

1.5.3. Chain of Responsibility Summary (0:28)

1.5.4. Chain of Responsibility Pitfalls (0:19)

1.5.5. Chain of Responsibility Exercises (0:17)

Handcrafted Proxies

2. Handcrafted proxies (1:47)

2.1.1. Virtual Proxy (1:04)

2.1.2. CustomMap Interface (0:34)

2.1.3. CustomHashMap Class (1:46)

2.1.4. VirtualCustomMap Class (1:58)

2.1.5. CustomMap Class Diagram (1:40)

2.1.6. Using VirtualCustomMap (1:47)

2.1.7. Sizeof in Java (1:24)

2.2. Remote Proxy (2:06)

2.2.1. RealCanada (0:41)

2.2.2. Spark Framework (1:16)

2.2.3. Service Publisher with Spark (0:48)

2.2.4. Service Publisher with Jetty (0:48)

2.2.5. Remote Proxy CanadianEmbassy (2:03)

2.2.6. Canada Class Diagram (0:44)

2.2.7. Heinz Applying for Canadian Visa (0:28)

2.3. Protection proxy (1:24)

2.3.1. ConcurrentTest for testing thread safety in CustomMap (2:33)

2.3.2. Code walk-through and demo for ConcurrentTest (5:12)

2.3.3. Protection Proxy to the rescue (0:16)

2.3.4. SynchronizedCustomMap (0:29)

2.3.5. Synchronized or ReentrantLock? (1:49)

2.3.6. SynchronizerTestDemo (0:47)

2.3.7. Unmodifiable Map (1:05)

2.3.8. UnmodifiableCustomMap (1:25)

2.3.9. UnsupportedOperationException (2:03)

2.4. Cascaded Proxies (0:40)

2.4.1. More flexible proxy structure (0:27)

2.4.2. Cascading proxies code (1:14)

2.5. equals() in proxies (1:18)

2.5.1. IDE-generated equals() in CustomHashMap (1:46)

2.5.2. How AbstractMap implements equals() (1:09)

2.5.3. New CustomHashMap.equals() method (Broken contract) (1:58)

2.5.4. Proxy’s equals() delegates call (0:24)

2.5.5. Correct CustomHashMap.equals() (2:52)

2.6.1. Exercise 2.1. Problem Statement (3:23)

2.6.2. Exercise 2.1. Walkthrough (7:43)

2.6.3. Exercise 2.2. Problem Statement (16:13)

2.6.4. Exercise 2.2. Walkthrough (24:03)

2.7. Summary (0:47)

Dynamic Proxies

3. Dynamic Proxies (0:46)

3.0.1. Avoid Copy and Paste (3:53)

3.1. Proxy.newProxyInstance() (3:55)

3.1.1. IllegalArgumentException from Wrong ClassLoader (0:45)

3.1.2. Correct ClassLoader Specified (1:13)

3.1.3. Java Platform Module System (4:26)

3.1.4. InvocationHandler (1:38)

3.2. LoggingInvocationHandler (1:13)

3.2.1. invoke() Method for LoggingInvocationHandler (3:51)

3.2.2. toString() Prints Methods with Args (0:49)

3.2.3. Demo of LoggingInvocationHandler (1:21)

3.3. Dissecting a Dynamic Proxy (0:28)

3.3.1. Dynamic Proxy Class Name (1:03)

3.3.2. Decompiling $Proxy0 (0:48)

3.3.3. $Proxy0 Code Walkthrough (6:41)

3.3.4. How Does $Proxy0 Work? (1:29)

3.3.5. EscapeAnalysisTest of Arguments Array (4:45)

3.3.6. Turbo-boosting Reflection Methods (1:41)

3.3.6.1. TurboBoosterTest Demo (6:27)

3.3.6.2. MethodTurboBooster Code Review (2:02)

3.4. Recasted Exceptions (0:15)

3.4.1. Unexpected Exceptions Causing Issues (0:30)

3.4.2. RecastingExceptionsBroken (1:31)

3.4.3. Unwrapping InvocationHandler (1:30)

3.4.4. RecastingExceptionsFixed (0:26)

3.5. Proxies Facade (1:01)

3.5.1. Proxies.castProxy() (1:16)

3.5.2. simpleProxy() (0:53)

3.5.3. RealISODateParser (0:50)

3.5.4. Using Proxies Facade (1:17)

3.6. Virtual Dynamic Proxy (1:04)

3.6.1. Proxies Facade virtualProxy() (0:26)

3.6.2. Creating Virtual Proxy (1:08)

3.6.3. Company and MoralFibre (1:24)

3.6.4. CompanyTest (0:59)

3.7. Synchronized Dynamic Proxy (1:02)

3.7.1. Proxies Facade synchronizedProxy() (0:17)

3.7.2. SynchronizedTest (0:51)

3.8. Cascading Dynamic Proxies (1:12)

3.9. EnhancedStream (1:57)

3.9.1. EnhancedStream Code Review (1:42)

3.10. Dynamic Proxy Restrictions (0:28)

3.10.1. Interfaces Only (0:36)

3.10.2. UndeclaredThrowableException (0:32)

3.10.3. Return Types Have to be Correct (0:58)

3.10.4. Naming Mysteries (1:33)

3.10.5. Deeper Call Stacks (0:39)

3.10.5.1. Leaky Abstractions (1:59)

3.10.6. Shared Proxy Classes (1:47)

3.11. Performance (3:00)

3.11.1. Model for Benchmark using JMH (4:05)

3.11.2. Benchmark increment() Results (1:37)

3.11.3. Benchmark consumeCPU() Results (0:50)

3.11.4. Summary of Benchmark Results (0:40)

3.12. Exercises (0:15)

3.12.1. Exercises 3.1. Problem Statement (0:24)

3.12.2. Exercises 3.1. Walkthrough (1:30)

3.12.3. Exercises 3.2. Problem Statement (2:13)

3.12.4. Exercises 3.2. Walkthrough (8:31)

Dynamic Decorators

4. Dynamic Decorator (0:36)

4.0. Decorator Structure (0:36)

4.1. Filtering for Immutability (2:53)

4.1.1. ImmutableCollection (1:14)

4.1.2. HandcodedFilter (1:04)

4.1.3. MutableCollection (0:22)

4.1.4. UML Diagram (1:04)

4.1.5. HandcodedFilter Demo (1:44)

4.2. FilterHandler (4:52)

4.2.1. FilterHandler Class (4:54)

4.2.2. Proxies Facade Gets filter() Method (1:43)

4.2.3. Dynamic Filter Demo (1:07)

4.2.4. What Happened? (2:24)

4.3. VTable (0:44)

4.3.1. VTable Overview (2:05)

4.3.2. ParameterTypesFetcher (4:48)

4.3.3. MethodKey (4:52)

4.3.4. VTable (3:57)

4.3.4.1. VTable put() and findIndex() (7:38)

4.3.4.2. VTable.getDefaultMethodHandle() (6:08)

4.3.4.3. Turbo-Boosting Methods in VTable (0:57)

4.3.4.4. VTable.lookup() and stream() (3:41)

4.3.5. VTable.Builder (19:03)

4.3.6. VTables Facade (1:39)

4.3.7. VTable Summary (0:22)

4.4. ChainedInvocationHandler (5:41)

4.4.1. UnhandledMethodException (0:44)

4.4.2. VTableHandler (1:48)

4.4.3. VTableDefaultMethodHandler (3:39)

4.4.4. UnifiedInvocationHandler (6:37)

4.5.1. Exercise 4.1. Problem Statement (0:48)

4.5.2. Exercise 4.1. Walkthrough (2:11)

4.5.3. Exercise 4.2. Problem Statement (3:32)

4.5.4. Exercise 4.2. Walkthrough (13:30)

Dynamic Object Adapter

5. Dynamic Object Adapter (0:30)

5.0.1. Singer and Rapper (0:59)

5.0.2. Class Adapter (1:12)

5.0.3. Object Adapter (1:21)

5.1. Better Collections (0:12)

5.1.1.1. Generics Type Erasure (2:31)

5.1.1.2. Demo of ArrayList (2:17)

5.1.1.3. Covariant Return Types (2:44)

5.1.2.1. BetterArrayList (1:33)

5.1.2.2. Demo of BetterArrayList (1:00)

5.1.3.1. BetterCollection Interface (1:24)

5.1.3.2. BetterConcurrentSkipListSet (0:34)

5.1.4.1. Object Adapter Pattern (1:16)

5.1.4.2. BetterCollectionObjectAdapter (1:23)

5.1.4.3. Demo of BetterCollectionObjectAdapter (0:24)

5.1.4.4. What if we want to make a better Set, List, etc.? (0:51)

5.1.5.1. ObjectAdapterHandler (1:53)

5.1.5.2. Proxies.adapt() (1:43)

5.1.5.3. BetterCollectionFactory (2:22)

5.1.5.4. Demo of Dynamic Object Adapter (1:15)

5.2.1. Dynamic Object Adapter Restrictions (1:09)

5.2.2. AdapterPuzzle1 (3:45)

5.2.3. AdapterPuzzle2 (1:07)

5.3. Performance (0:28)

5.3.1. Benchmark (3:19)

5.3.2. JMH Benchmark Code (6:21)

5.3.3. Benchmark size() Results (3:14)

5.3.4. Benchmark toArray() Results (4:26)

5.3.5. Benchmark forEachFiltered() Results (6:22)

5.4.1. Exercise 5.1. Problem Statement (1:51)

5.4.2. Exercise 5.1. Walkthrough (5:21)

5.4.3. Exercise 5.2. Problem Statement (1:16)

5.4.4. Exercise 5.2. Walkthrough (5:47)

5.4.5. Exercise 5.3. Problem Statement (1:24)

5.4.6. Exercise 5.3. Walkthrough (11:07)

Dynamic Composite

6. Dynamic Composite (3:21)

6.0.1. Composite Structure (1:12)

6.0.2. Visitor Pattern (1:06)

6.0.3. add() and remove() in Component? (5:32)

6.1. Mailing List (3:01)

6.1.1. Contact and Person (0:55)

6.1.2. DistributionList (1:36)

6.1.3. Contact Class Diagram (1:18)

6.1.4. Let’s Build a Mailing List (1:12)

6.1.5. Mailing List Object Graph (0:28)

6.1.6. Composite Classes Look Similar (0:34)

6.1.7. BaseComponent (0:51)

6.1.8. Contact extends BaseComponent (0:24)

6.1.9. BaseComponent Class Diagram (0:48)

6.2. CompositeHandler (0:53)

6.2.1. CompositeHandler Constructor (1:47)

6.2.2. Matching add() and remove() methods (1:09)

6.2.3. requiresAllInterfaces() (1:42)

6.2.4. addChildMethods() (7:02)

6.2.5. UncheckedException (1:08)

6.2.6. mapFunction() (2:09)

6.2.7. map and reduce (3:53)

6.2.8. Reducer.PROXY_INSTANCE_REDUCER (0:44)

6.2.9. Merging final result and unwrapping UncheckedException (0:28)

6.2.10. CompositeHandler summary (0:13)

6.2.11. Proxies.compose() (1:10)

6.2.12. Dynamic Composite Contact (0:56)

6.3. TeeAppendables (1:15)

6.3.1. Demo of TeeOutputStream (0:52)

6.3.2. OutputStreamComposite (0:26)

6.3.3. Interfaces of OutputStream and Writer (2:24)

6.3.4. TeeAppendable Handwritten Composite (1:39)

6.3.5. Making TeeAppendable into Writer (1:01)

6.3.6. Demo of TeeAppendable (2:27)

6.4. AppendableFlushableCloseable (1:44)

6.4.1. Composing Appendable Dynamically (0:58)

6.5.1. Exercise 6.1. Problem Statement (2:18)

6.5.2. Exercise 6.1. Walkthrough (9:44)

6.5.3. Exercise 6.2. Problem Statement (0:42)

6.5.4. Exercise 6.2. Walkthrough (3:22)

Conclusion

7. Conclusion (4:56)

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