JCache is here. Say Goodbye to proprietary Caching APIs!

/**
* JCache is here. Say Goodbye to proprietary
* Caching APIs!
*
* @author Jaromir Hamala
* @since 18-03-2014
*/

Who Am I?
● Jaromir Hamala
● Passionate Developer
● Working for Hazelcast
● Open Source Fan

Warning: May Get Extremely Silly!

Why?
L1 cache reference                            0.5 ns
Branch mispredict                             5   ns
L2 cache reference                            7   ns
Mutex lock/unlock                            25   ns
Main memory reference                       100   ns
Compress 1K bytes with Zippy              3,000   ns
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms
Read 1 MB sequentially from memory      250,000   ns    0.25 ms
Round trip within same datacenter       500,000   ns    0.5  ms
Read 1 MB sequentially from SSD*      1,000,000   ns    1    ms
Disk seek                            10,000,000   ns   10    ms
Read 1 MB sequentially from disk     20,000,000   ns   20    ms
Send packet CA>Netherlands>CA     150,000,000   ns  150    ms
Sources: https://gist.github.com/jboner/2841832 http://commons.wikimedia.org/wiki/File:Roaring_Lion_Travis_Jervey.jpg

Evolutions of Caching
● Roll your own :-( Do. Not. Do. That.
● Use a proprietary API :-/
● Use JCache! :-)

What is JCache
● Standard API for Caching
● Think of “JDBC for caching” (only better:)
● JSR-107
– The longest running JSR ever (?)
● “The best thing since sliced bread”
● Targetted to Java SE 6+

What really is JCache
● Basic Caching - somewhat similar to a j.u.Map
● Events
● Computations

Be Aware: It is just an API!
● Think of JMS (only better:)
● It doesn't say anything about data distribution,
network topology or wire-level protocol!

Existing Implementations
● Coherence
● EHCache
● Hazelcast
● Infinispan
Source: http://www.mtbeer.com/how-beer-tap-handles-are-made/

Quick Start
1. Add JCache API JAR on a classpath
2. Choose your implementation
3. Code!
Source: http://commons.wikimedia.org/wiki/File:Start_Jeremy_Wariner_2007.jpg

Basic Terminology
● Cache
● CacheManager – “provides a means of
establishing, configuring acquiring, closing and
destroying uniquely named Caches.”
– Just think of CacheFactory (for now)
● CacheProvider – manages lifecycle of
CacheManagers CacheProvider
CacheManager CacheManager
Cache1
Cache2
Cache3
Cache4
Cache3

Interesting Features I
● Entry Processors
– Data Transformations
– Computing

Interesting Features II
● Listeners
Cache
Listener1
Event
Cache User Update
Listener2
Event

Listeners
● CacheEntryCreatedListener
– onCreated();
● CacheEntryRemovedListener
– onRemoved();
● CacheEntryUpdatedListener
– onUpdated();
● CacheEntryExpiredListener
– onExpired();

Cache Loaders / Writers
Source: http://commons.wikimedia.org/wiki/File:Stipula_fountain_pen.jpg

CacheLoader
public interface CacheLoader<K, V> {
  V load(K key) throws CacheLoaderException;

  Map<K, V> loadAll(Iterable<? extends K>
keys) throws CacheLoaderException;
}

CacheWriter
public interface CacheWriter<K, V> {
  void write(Cache.Entry<? extends K, ? extends V>
entry) throws CacheWriterException;
  void writeAll(Collection<Cache.Entry<? extends K,
? extends V>> entries) throws CacheWriterException;
  void delete(Object key) throws
CacheWriterException;
  void deleteAll(Collection<?> keys) throws
CacheWriterException;
}

Other Features
● Annotations
– @CacheResult
– @CachePut
– @CacheRemove
– @CacheRemoveAll
● Expiry Policy
● Statistics
● Store-By-Value vs. Store-By-Reference

Integrations
● Spring Framework
● Java EE 8 (maybe)
● Payara
Source: http://towson.shownbyphotos.com/20060818-towson-univ-0003-800.jpg-large.html

Tips & Tricks
● Isolate Implementation-Specific Stuff
● Be carefull with the default CachingProvider
● EntryProcessors are awesome!
http://en.wikipedia.org/wiki/File:1_bowl_skate_boarding.JPG http://www.mylifeonboard.net/2011/03/04/is-it-dangerous-yeah-danger-is-the-middle-name-of-our-sport/

Missing Bits
● No Async Interface in the spec
– Proprietary extensions
● Eviction
● Query

Further Sources
● https://jcp.org/en/jsr/detail?id=107 - 130 pages
● https://github.com/jsr107
● https://groups.google.com/forum/#!forum/jsr107

String viking =
dictionary.get(“Thank you”);
assert(“tack”, viking);

JCache is here. Say Goodbye to proprietary Caching APIs!

More Related Content

What's hot (20)

Similar to JCache is here. Say Goodbye to proprietary Caching APIs! (20)

Recently uploaded (20)

JCache is here. Say Goodbye to proprietary Caching APIs!