Java one 2010

Javaone 2010 report Tadaya Tsuyukubo @ttddyy http://bit.ly/ttddyy_javaone2010

Oracle OpenWorld + JavaOne Year 2010 Sep 19-23 San Francisco

Java 7, 8 Productivity Performance Modularity Project Coin Productivity with More Concise Code Project Lambda Closures for Java Project Jigsaw The Modular Java Platform NIO2(jsr203), Concurrency and Collections updates(jsr166y), JDBC4.1, etc.

Project Coin Diamond Map<String, List<Integer>> map = new HashMap<>() Try-with-resources try( InputStream is = new FileInputStream(in); OutputStream os = new FileOutputStream(out) ) { ... } catch (Exception e) { ... } Strings in Switch Improved integral literals Vargs warnings Multi-catch & precise rethrow

Project Lambda SAM (Single Abstract Method) Collections.sort( data, #( int a, int b ){ a.length() - b.length() } ); double max = students.filter( #{ s -> s.gradYear == 2010 }) .map( #{ s -> s.score }) .max(); Method Reference Collections.sortBy(students, #Student.getName);

Project Jigsaw eliminate the class path light weight memory foot print module-info.java meta data (module dependency info) @Version("1.0") @ImportModules( { @ImportModule(name="java.se"), @ImportModule(name="com.foo.OrderProcessingService"), @ImportModule(name="com.bar.PrintService") } ) @MainClass("hello.HelloWorld") module hello;

etc. Value Class value class Foo { property Foo parent; property String name; } JVM upto 32G Heap Compaction NUMA (Non-Uniform Memory Access) G1GC (Garbage First GC) Integrate JRockit to HotSpot Nondisruptive, Scalable, High Performance VM

Java Release Plan Plan B Java7 (mid 2011) most of "Project Coin" New I/O APIs Fork/Join Framework InvokeDynamic etc. Java8 (late 2012) Project Lambda Project Jigsaw Rest of Project Coin etc.

Web related tech sessions EJB3 features (Transaction, Business Tier) Bean Validation (JSR303) Hibernate Validator CDI(Contexts and Dependency Injection) (JSR299) @Inject, @Model, @Singleton, @Stateless, etc. JPA 2.0 (JSR317) For Java6 Common Annotation for the Java Platform (JSR250) @Resource, @PostConstruct, @PreDestroy

Annotation Jam @Secure @Transactional @RequestScoped @Named class SomeClass { ...... } @BusinessLogic class SomeClass { } use customized stereotype

Web session summary new features are mostly available in spring using spring is a correct choice giving more confusion to developers EJB containers are required mostly commercial still heavy weight Advantage of using EJB session clustering remoting commercial support? vendor specific tools spring is much better!! - lightweight - integration to other tech

Case Study (mint.com) Free personal financial management web 2billion financial transaction 10m+ transaction per day Architecture spring + hibernate memcached intensive use of AOP

DB Scaling NOSQL lose integrity ==> not best fit User ID based sharding Hierarchical data model Logical database separation user data & non user data put user_id to all hierarchical entities (user data) every user data is exclusive and have locality

Implementation Minimize infrastructure sharding info to implementation context annotation AOP @MintUserdata class UserService { .... } @MintCommondata class MasterDataService { .... } switch SessionFactory, Datasource by AOP based on the annotation

Monitoring collect data from real prod requests viewed page, traffic, behavior cache statistics hibernate statistics thread pool & queue size monitoring overhead must be low aggregate results in memory persist periodically

Monitoring Impl monitor all spring beans AOP autoproxy all beans, no code change All methods (request-response lifecycle) can be drilldown build custom tool (80/20 rule) intensive use of AOP to monitor application error logs log messages are parametrized, centeralized web tool to easily search/parse errors like splunk ~/account.htm?id=1 100ms AccountController#info() 10ms AccountService#getInfo() 20ms AccountDao#getInfoById() 70ms

Security & How to reduce Bug Use hibernate to enforce isolation use AOP or hibernate callback if data tries to access data that doesn't belong to the user, throws exception Detect crosstalk (multi thread test) run test class with multiple user (sequential, multithread)

Case Study (eBay) 10bil requests per day 10K java servers partition everything asynchronous everywhere automate everything everything fails embrace inconsistency expect (r)evolution dependencies matters respect authority (data) never enough data custom infrastructure

Case Study (Sinapto) Online Poker in Italy 3000 concurrent players Architecture Vertical, Horizontal partitioning (table, tournament) asynchronous (event driven) pass around status object

Case Study (Caché) Specialized to write huge data example: 3-D map of Galaxy monitor 1billion stars, more & more newly found ones (Peta byte level data) stock market trading information government, healthcare, financial industry solution: wrote DB : 130+K sustained inserts per sec

JDBC: runs over tcp/ip (even locally) use JNI (Java Native Interface) Store multi dimensional data XEP: serialize & store MDS: Monitoring & Deiscovery Service

NOSQL This does not replace RDBMS Suit for representing data in a simple datastructure High Scalability Flexible modification Specialized process Characteristic no join mostly search data by single rowkey eventual consistency

Data Model Eventual Consistency no transaction, no consistency application needs to handle consistency Example: For column based DB, there is no association table, and no cascade delete. When parent data is removed, child data needs to deleted by application RDBMS NoSQL relational column, KV, etc.

Testing Unit Test selenium IDE junit mock Integration Test starting container at beginning of test in code

Functional Programming "OO is better to project our world structure FP excels at actual coding of the algorithm" Use OO to build classes Use FP to implement methods Java 7, 8 will have FP(closure) feature. (lambda project)

Conclusion spring is the best!! Java future loadmap, Case Studies javaone 2010 Technical sessions Spring One Server Side No Fluff, Just Stuff met jp java community

Java one 2010

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Java one 2010