Let's talk about the cache! - Mathilde Lemée - Codemotion Rome 2015
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Let's talk about the cache! - Mathilde Lemée - Codemotion Rome 2015
- 1. Mathilde Lemee Cache @MathildeLemee - Aetys ROME 27-28 march 2015
- 2. Mathilde Lemée @MathildeLemee DuchessFR Founder Tests Java developper Distributed Cache/IMDG
- 3. Why ? 3
- 7. 100TB
- 8. 3000 $
- 9. 100k
- 10. 2 millions
- 12. Key Value STORE
- 13. JSR 107 Cache<String, Integer> cache = Caching.getCache("simpleCache", String.class, Integer.class); 13
- 17. Value/Reference
- 18. JSR 107 /** * Type of Expiry */ public enum ExpiryType { /** * Time since last modified. Creation is also considered a modification event. */ MODIFIED, /** * Time since last <em>accessed</em>. Access means any access to an entry including * a modification event. Examples are: * <ul> * <li>put</li> * <li>get</li> * <li>containsKey</li> * <li>iteration</li> * </ul> * */ ACCESSED } 18
- 19. PATTE RN 19
- 21. JSR 107 String helloMessage = cache.get("helloKey"); if (helloMessage == null) { helloMessage = new StringBuilder(20) .append("Hello World ! ") .append(System.currentTimeMillis()) .toString(); cache.put("helloKey", helloMessage); } • // functionnal use of the helloMessage 21
- 23. Cache as a s-o-r : Read through Database Application Ehcache Persistence layer #CodeMotion @MathildeLemee
- 24. public interface CacheLoader<K, V> { /** * Loads an object. Application developers should implement this * method to customize the loading of a value for a cache entry. This method * is called by a cache when a requested entry is not in the cache. If * the object can't be loaded <code>null</code> should be returned. */ V load(K key) throws CacheLoaderException; /** * Loads multiple objects. Application developers should implement this * method to customize the loading of cache entries. This method is called * when the requested object is not in the cache. If an object can't be loaded, * it is not returned in the resulting map. */ Map<K, V> loadAll(Iterable<? extends K> keys) throws CacheLoaderException; } 24
- 25. Cache as a s-o-r : Write through Database Application Ehcache Persistence layer #CodeMotion @MathildeLemee
- 26. public interface CacheWriter<K, V> { void write(Cache.Entry<? extends K, ? 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; } 26
- 27. Cache as a s-o-r : Write Behind Database Application Ehcache Persistence layer Write-behind thread #CodeMotion @MathildeLemee
- 30. AVOID PEAK CONTENTION #CodeMotion @MathildeLemee
- 33. Write Through – Response Time #CodeMotion @MathildeLemee
- 34. Write Behind – Temps de réponses #CodeMotion @MathildeLemee
- 36. Write Through – Database load #CodeMotion @MathildeLemee
- 37. Write Behind – Database load #CodeMotion @MathildeLemee
- 41. And now ? 41
- 42. Types of cache • Local • Remote • Mirrored • Distributed • Replicated • Near 42
- 44. 44
- 45. 45
- 47. #CodeMotion
- 48. #CodeMotion
- 50. 50
- 52. 52
- 53. 53
- 54. Configuration managerConfig = new Configuration() .terracotta(new TerracottaClientConfiguration().url("localhost: 9510").rejoin(true)) .cache(new CacheConfiguration().name("nonstop-sample") .persistence(new PersistenceConfiguration().strategy(DISTRIBUTED)) .maxBytesLocalHeap(128, MemoryUnit.MEGABYTES) .maxBytesLocalOffHeap(1, MemoryUnit.GIGABYTES) .terracotta(new TerracottaConfiguration() )); 54
- 60. IMDG = IMDG + #CodeMotion @MathildeLemee
- 61. 61
- 63. “Event processing is a method of tracking and analyzing (processing) streams of information (data) about things that happen (events),[1] and deriving a conclusion from them”#CodeMotion @MathildeLemee