JVM focused reactive programming for Java8. Stay one step ahead of your fellow developers and become a Java Hero with Speedment.

1. ACCELERATED ORM FOR JAVA 8
AN OPEN SOURCE SOLUTION
Per-Åke Minborg

2. BIO
PER-ÅKE MINBORG
• Chalmers, Master of Science
• Java >15 years
• Speaker at Meetups and Javaforums around the globe
• Java 8 and OpenSource blogger
• Recently with project Speedment
• Code_n Big Data award 2014
• 33-list winner 2015 (NyTeknik and Affärsvärlden)

3. PROBLEM
• Long response times is the most common IT problem at work
• The amount of data is increasing every day

4. SOLUTIONS
New Ground
Application developer
HW supplier
DBA
Architect
Carpenter
Painter
Ground
Buy faster better
more HW -expensive
Optimize database –minor effect
Extreme performance –migration project
speedment.org

5. SPEEDMENTS CURRENT IMPLEMENTATIONS
• Trouble Ticket Solution
• Web Application
• Train Infotainment Plattform
• Energy Measurment Tracking
• Database Consolidation Layer

6. THE JAVA DEVELOPER BEHIND THE STEERING WHEEL!
A Database application development tool in Java – a modern ORM (Object Relational Mapping)
• The hot new solution
• Fast to develop applications
• Extreme database speed
• Reactive Programming

7. DO YOU RECOGNIZE THE FOLLOWING?
When coding it is complex to connect to a database…..
…then you use an ORM
Source: ZeroTurnaround 2014

8. SOME PROS OF USING AN ORM:
• You can work with a relational database as if it were object oriented.
• Increased productivity.
• Provides a certain degree of abstraction (you can replace your DBMS).

9. SOME CONS OF USING AN ORM:
• Slows down the application
• You can not access all Java 8 features
• You must still write SQL, HQL, et. al

10. IT STARTED WITH A PROBLEM

11. TECHNOLOGY EVOLUTION
• Memory size exponentially doubles each 18:th month
• The number of CPU-cores [N] is increasing moderately
• Performance per CPU-core [P(N)] is increasing moderately
• P = N*P(N) is increasing exponentially
• No one will use magnetic disks for performance applications
• "Cloud" deployment is popular

12. JVM
NEW SOLUTION
MOV
CQRS
In-
Memory
Copy
Relational
Database

13. WHAT IS DIFFERENT WITH THE SOLUTION?
• Everything(*) is always in-memory(**) (in the JVM)
• We never have to check if an object is in cache
• We can organize objects knowing that we have them all
• We do not even have to look at individual objects -> O(1)
• Everything is Java 8. No legacy!
Size
Time
O(1)
O(n)

14. WORK FLOW
1. Database 2. Speedment GUI 3. IDE

15. SUPPORT FOR DATA FROM
• RDBMS
• NoSQL Databases
• Other "Data Sources" like files

16. SCALE UP IN LOCAL MEMORY
• JVM can exceed physical RAM
• Compression
• Deduplication
• Layered storage engines
(On-Heap, Off-Heap, SSD, Disk, SQL)
• Lazy load
~24 GB
>1 TB
>4 TB
∞
On-Heap
Off-
Heap
SSD
SQL
100 MTPS
20 MTPS
1 MTPS
0,001 MTPS
Database Size:
(After Compression)
Transaction Speed:

17. SCALE OUT WITH HAZELCAST
• Set up a cluster in the Cloud
• Scale out your existing database
• Set up Terabytes of RAM

18. PROPERTIES:
• The API will remain the same regardless of selected Storage Engine
• Massively concurrent and lock free
• Scale with CPU performance and number of cores
• Eventually consistent
• Transaction safe, if you want

19. PROPERTIES:
• The database ”owns” the data
• Data is reflected into Materialized Object Views (MOVs)
• MOVs and application resides in the same JVM
• Most operations are O(1)
• persons.byName(“Bob") -> Map<PK,Person> with 1000 persons in 100 ns (30 m)
• TCP/IP RTT 100 us -> +1000 "finds" per TCP RT.
• In-memory DBs with zero query latency are snails by definition

20. SPEED IN TWO DIMENSIONS
1) Speed development
2) Speed Execution

21. EXECUTION SPEED
Server
ApplicationDatabase
1
Query: 1 s
Server
Application
Database
in-memory
2
Query: 0 s
JVM
Server
ApplicationDatabase
3
Data
copy
3 days
0 s

22. SPEEDMENT ORM API
• Embrace Java 8 paradigm with stream(), filter(), sort(), limit() etc.
• Forget about SQL, JQL et. al

23. SPEEDMENT ORM API, GENERATED CODE
• Everything is interfaces!
• Completely pluggable architecture
• Default classes that implements the interfaces are generated
• Write (possibly several) custom entity implementations
• Override or create your own Managers
• Expand the existing code generation with your own custom code (pluggable)
•”Write code that writes code”

24. SPEEDMENT ORM API
• MOVs are Map<PK, Entity> and are immutable (in user-land)
• Entities are immutables
• You can then get mutable Beans/Builders (They are Interfaces too)
•API remains the same regardless of Storage Engine
•Dynamic joins -> Maps with Maps with Maps with... (TBI)

25. CODE EXAMPLES

26. INITIALIZATION
new HelloSpeedment().start();

27. PERSISTENCE
Hare harry = HareManager.get().builder()
.setName("Harry")
.setColor("Gray")
.setAge(3);
HareManager.get().persist(harry);

28. QUERYING
List<Hare> oldHares = HareManager.get()
.stream()
.filter(h -> h.getAge() > 8)
.collect(toList());

29. OPTIMISED KEY-VALUE LOOK-UP
Optional<Hare> harry = HareManager.get()
.stream()
.filter(h -> "Harry".equals(h.getName()))
.findAny();

30. ENTITIES ARE LINKED
Optional<Carrot> carrot = HareManager.get()
.stream()
.filter(h -> "Harry".equals(h.getName()))
// Carrot is a foreign key.
.flatmap(h -> h.findCarrots())
.findAny();

31. MULTI-THREADING
HareManager.get().parallelStream()
.filter(h -> HumanManager.get().stream()
.filter(n -> h.getName().equals(n.getName()))
.anyMatch()
).forEach(System.out::println);

32. REACTIVE PROGRAMMING
HareManager.get().onInsert(…)

33. CONFIGURATION
• Groovy script like Gradle
• Config file is placed at the same location as the POM
dbms {
schema {
table {
name = ”hare";
column {
name = "name";
}
}
}
}

34. API ("ENTITY" INTERFACES)
public interface Hare {
String getName();
interface Bean extends Hare {
void setName(String name);
}
}

35. API ("ENTITY" INTERFACES)
• A Hare implementing class needs only to implement one method.
• Implementation is completely hidden
• An entity does not need to inherit from a class "Entity" or similar

36. API (DEFAULT "ENTITY" IMPLEMENTATION)
public class HareImpl implements Hare {
private final name;
public HareImpl(Hare template) {
name = template.getName();
}
public String getName() { return name; }
}

37. API (CUSTOM "ENTITY" IMPLEMENTATION)
public class HarryHareImpl implements Hare{
public HarryHareImpl(Hare template) {
}
public String getName() { return “Harry”; }
}

38. API (MANAGER INTERFACE)
public interface HareManager
extends Manager<Hare> {
Hare.Bean toBean(Hare template);
Stream<Hare> stream();
Stream<Hare> byName(String name);

39. API (MANAGER INTERFACE)
void persist(Hare hare);
void remove(Hare hare);
// More...
}

40. EASE OF USE:
• Single Maven dependency in POM
• Maven targets
• Works with Gradle
• GUI to automatically derive the groovy config file from existing databases

41. OPEN SOURCE LICENSE
• Apache 2.0 License
• www.speedment.org

42. CONCLUSIONS
• Code generation, No boiler plate code
• Expand the code generation
• Focus on the problem at hand!
• Forget about the database
• Use Java 8
• Install your own implementations, if you like
• Insane application speed!

43. ARE YOU:
• Tired of legacy ORMs?
• In love with Java 8?
• A First mover that likes new exotic Exceptions?
• Cheer leader?
• A person that wish that null pointers were Optional ?
JOIN THE HARE!

44. WE ARE WHERE YOU ARE!
• www.speedment.org
• GitHub: https://github.com/speedment/speedment-orm
• Twitter: @Pminborg
• Mail: minborg@speedment.org
• Blog: minborgsjavapot.blogspot.com
• Innovation House Palo Alto
• Järntorget, Gothenburg