1. EhCache
To Cache Or Not To Cache?
Kaunas JUG
Saulius Tvarijonas · saulius.tvarijonas@gmail.com

2. Wiki
● Ehcache is a widely used open source Java distributed
cache for general purpose caching, Java EE and light-
weight containers
● Ehcache was originally developed by Greg Luck,
starting in 2003. In 2009, the project was purchased by
Terracotta

3. Will an Application Benefit from Caching?

4. Will an Application Benefit from Caching?
● Speeding up CPU-bound Applications
● Speeding up I/O-bound Applications
● Increased Application Scalability

5. Scaling

6. Topologies
● Standalone
● Distributed
● Replicated

7. Storage Options
● MemoryStore
● Off-HeapStore
● DiskStore

8. Cache Usage Patterns
● cache-aside (or direct manipulation)
● cache-as-sor (a combination of read-through and write-x patterns)
● read-through
● write-through
● write-behind (or write-back)
● copy-cache

9. Cache Sizing
● Bytes (maxBytesLocalHeap=”30M”)
● Count (maxEntriesLocalHeap)
● Percentage (maxBytesLocalHeap="40%")

10. Eviction
● Time To Live
● Time To Idle
● Eternal
● Pinning
● Overflow
● memoryStoreEvictionPolicy

11. Cache Persistence
<cache>
<persistence strategy=”localRestartable|localTempSwap|none|distributed”
synchronousWrites=”false|true”/>
</cache>

12. Search

13. Replication

14. Replication ● RMI, JGroups, JMS
● Serialization of key at least required
● Automatic Peer Discovery (Multicast)
● Bootstrap
● Sync and ASync
● Puts, Updates, Removals,
UpdatesViaCopy

15. WAN Replication

16. BigMemory Max

17. BigMemory Max
● Persistent Application State
● High Availability
● Fast Restartability
● Scalability
● Search

18. Products

19. JSR 107 Java Caching Standard
● javax.cache.Cache
● Java 6 required
● Included in Java 7 EE

20. Web Console

21. Web Console
● Real Time Statistics
● Live Configuration Updates
● Cache enable/disable/clear
● Charts

22. Test Storage Results
Type Total time
(Concurrent)HashMap 11ms
MemoryStore 39ms
Off-HeapStore 5800ms
DiskStore 11300ms
● Cache with 1k elements
● Element size 500 bytes
● Measuring getFromCache time (100k times)

23. EhCache 3.0
● Standard API JSR 107
● Generics, Java 8 ready
● Java 6 compatible
● Better configuration

24. Competitors
● Hazelcast
● Memcached
● Oracle Coherence
● Infinispan
● GemFire
● GridGain

25. Java Forever
Thank
You!