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• Senior Solutions Architect / Hazelcast • Завсегдатай конференций • Автор O’Reilly’s «Enterprise Web Development» Viktor Gamov @gamussa

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public interface Cache { void put(K key, V value); V putIfAbsent(K key, V value); V get(K key); long size(); }

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public class LocalCache implements Cache { ConcurrentMap storage = new ConcurrentHashMap<>(); @Override public void put(Integer key, Company value) { this.storage.put(key, value); } ... }

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public class LocalCache implements Cache { ConcurrentMap storage = new ConcurrentHashMap<>(); @Override public void put(Integer key, Company value) { this.storage.put(key, value); } ... }

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LocalCache myCache = new LocalCache<>(); // 20 MB String value= new String(new char[10000000]); Runtime runtime = Runtime.getRuntime(); int keyCount = 0; int mb = 1024 * 1024; while (true) { myCache.put(keyCount, value); keyCount++; System.out.printf("Unique Puts = %s keyCount : Free Memory (MB) = %s\n", keyCount, runtime.freeMemory() / mb); }

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Unique Puts = 1919785 keyCount : Free Memory (MB) = 2 Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded LocalCache myCache = new LocalCache<>(); // 20 MB String value= new String(new char[10000000]); Runtime runtime = Runtime.getRuntime(); int keyCount = 0; int mb = 1024 * 1024; while (true) { myCache.put(keyCount, value); keyCount++; System.out.printf("Unique Puts = %s keyCount : Free Memory (MB) = %s\n", keyCount, runtime.freeMemory() / mb); }

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MutableConfiguration config = new MutableConfiguration<>(); config.setStoreByValue(true) .setTypes(String.class, Integer.class) .setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(ModifiedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(TouchedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(EternalExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(AccessedExpiryPolicy.factoryOf(TEN_SEC)); Caching.getCachingProvider().getCacheManager().createCache("test", config);

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MutableConfiguration config = new MutableConfiguration<>(); config.setStoreByValue(true) .setTypes(String.class, Integer.class) .setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(ModifiedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(TouchedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(EternalExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(AccessedExpiryPolicy.factoryOf(TEN_SEC)); Caching.getCachingProvider().getCacheManager().createCache("test", config);

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MutableConfiguration config = new MutableConfiguration<>(); config.setStoreByValue(true) .setTypes(String.class, Integer.class) .setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(ModifiedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(TouchedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(EternalExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(CreatedExpiryPolicy.factoryOf(TEN_SEC)); //.setExpiryPolicyFactory(AccessedExpiryPolicy.factoryOf(TEN_SEC)); Caching.getCachingProvider().getCacheManager().createCache("test", config);

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import javax.cache.Cache; import javax.cache.Caching; Cache myCache = Caching.getCache("test"); // 20 MB String value= new String(new char[10000000]); Runtime runtime = Runtime.getRuntime(); int keyCount = 0; int mb = 1024 * 1024; while (true) { myCache.put(keyCount, value); keyCount++; System.out.printf("Unique Puts = %s keyCount : Free Memory (MB) = %s\n", keyCount, runtime.freeMemory() / mb); }

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import javax.cache.Cache; import javax.cache.Caching; Cache myCache = Caching.getCache("test"); // 20 MB String value= new String(new char[10000000]); Runtime runtime = Runtime.getRuntime(); int keyCount = 0; int mb = 1024 * 1024; while (true) { myCache.put(keyCount, value); keyCount++; System.out.printf("Unique Puts = %s keyCount : Free Memory (MB) = %s\n", keyCount, runtime.freeMemory() / mb); }

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import javax.cache.Cache; import javax.cache.Caching; Cache myCache = Caching.getCache("test"); // 20 MB String value= new String(new char[10000000]); Runtime runtime = Runtime.getRuntime(); int keyCount = 0; int mb = 1024 * 1024; while (true) { myCache.put(keyCount, value); keyCount++; System.out.printf("Unique Puts = %s keyCount : Free Memory (MB) = %s\n", keyCount, runtime.freeMemory() / mb); }

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CACHES

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public class MyCacheEntryListener implements CacheEntryCreatedListener, CacheEntryUpdatedListener { public void onCreated( Iterable> cacheEntryEvents) throws CacheEntryListenerException { for (CacheEntryEvent entryEvent : cacheEntryEvents) { System.out.println("Created : " + entryEvent.getKey() + " with value : " + entryEvent.getValue()); } } public void onUpdated( Iterable> cacheEntryEvents) throws CacheEntryListenerException { for (CacheEntryEvent entryEvent : cacheEntryEvents) { System.out.println("Updated : " + entryEvent.getKey() + " with value : " + entryEvent.getValue()); } } }

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Бизнес-приложение сервис сервис сервис RDBMS Mainframe MongoDB NoSQL REST Масштабирование JCACHE read through cache write through cache

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/** * Sample of a Read Through CacheLoader */ public class MyCacheLoader implements CacheLoader { public String load(String key) throws CacheLoaderException { if ("Portugal".equals(key)) { return "Lisbon"; } return null; } /** * Async Load Up of a Cache. */ public Map loadAll(Iterable extends String> keys) throws CacheLoaderException { // Iterate the keys and maybe batch load from a DB, // a Filesystem or some other System completely. return null; } }

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/** * Example of a JCache CacheWriter, use this to write to a RDBMS or somefink. */ public class MyCacheWriter implements CacheWriter { public void write(Cache.Entry extends String, ? extends String> entry) throws CacheWriterException { System.out.println("Write Entry : " + entry.getKey()); } public void writeAll(Collection> entries) throws CacheWriterException { for (Cache.Entry entry : entries) { System.out.println("Write Entry : " + entry.getKey()); } } public void delete(Object key) throws CacheWriterException { } public void deleteAll(Collection> keys) throws CacheWriterException { } }

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public class AppConfig { public static interface CityService { public String getCity(); } @Bean public CityService getService() { return new CityService() { @Override public String getCity() { // slow code goes here! return result; } }; } }

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import javax.cache.annotation.CacheResult; import org.springframework.cache.annotation.EnableCaching; @Configuration @EnableCaching public class AppConfig{ public static interface CityService { @CacheResult(cacheName = "city") public String getCity(); } @Bean public CityService getService() { return new CityService() { @Override public String getCity() { // slow code goes here! return result; } }; } }

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import javax.cache.annotation.CacheResult; import org.springframework.cache.annotation.EnableCaching; @Configuration @EnableCaching public class AppConfig{ public static interface CityService { @CacheResult(cacheName = "city") public String getCity(); } @Bean public CityService getService() { return new CityService() { @Override public String getCity() { // slow code goes here! return result; } }; } }

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CACHES

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http://fc07.deviantart.net/fs71/i/2012/156/3/b/bruce_banner_by _lightning_stroke-d52er xe.png

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Caching «загрузчик» CachingProvider «Реализация SPI» CacheManager «управоляет кэшами» Cache «интерфейс к кэшу»

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CachingProvider cachingProvider = Caching.getCachingProvider(); CacheManager cacheManager = cachingProvider.getCacheManager(); Cache cache = cacheManager.getCache("test");

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Cache cache = Caching.getCache("test");

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CachingProvider cachingProvider = Caching.getCachingProvider(); CacheManager cacheManager = cachingProvider.getCacheManager(); Cache cache = cacheManager.getCache("test"); ICache unwrappedCache = cache.unwrap(ICache.class);

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Cache cache = Caching.getCache("test"); ICache unwrappedCache = cache.unwrap(ICache.class);

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ICache unwrappedCache = cache.unwrap(ICache.class); ICompletableFuture future = unwrappedCache.getAndPutAsync(1, "value"); future.andThen(new ExecutionCallback() { public void onResponse(String response) { System.out.println("Previous value: " + response); } public void onFailure(Throwable t) { t.printStackTrace(); } });

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Green Primary Green Backup Green Shard

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public static class CustomCacheMergePolicy implements CacheMergePolicy { @Override public Object merge(String cacheName, CacheEntryView mergingEntry, CacheEntryView existingEntry) { if (mergingEntry.getValue() instanceof Integer) { return mergingEntry.getValue(); } return null; } }

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ICache iCache1 = cache1.unwrap(ICache.class); iCache1.addPartitionLostListener(new CachePartitionLostListener() { @Override public void partitionLost(CachePartitionLostEvent cachePartitionLostEvent) { System.out.println(cachePartitionLostEvent); latch.countDown(); } });

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Вместо окончания

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