Ehcache: bulk cache writing support using putAll method

org.ehcache.Cache#putAll method insert values from a map to the cache.

 

Signature

void putAll(Map<? extends K, ? extends V> entries) throws BulkCacheWritingException;

 

Example

empCache.putAll(dataMap);

 

Find the below working application.

 

CachePutAllDemo.java

 

package com.sample.app;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.Cache.Entry;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.CacheManagerBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;

public class CachePutAllDemo {

	private static void printAllElementsFromCache(Cache<Long, String> empCache) {
		System.out.println("\nPrint all the elements from the cache");

		Iterator<Entry<Long, String>> iter = empCache.iterator();

		while (iter.hasNext()) {
			Entry<Long, String> entry = iter.next();
			System.out.println(entry.getKey() + " is mapped to (" + entry.getValue() + ")");
		}

	}

	public static void main(String[] args) {
		CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder().build(true);

		Cache<Long, String> empCache = cacheManager.createCache("empCache", CacheConfigurationBuilder
				.newCacheConfigurationBuilder(Long.class, String.class, ResourcePoolsBuilder.heap(100)).build());

		Map<Long, String> dataMap = new HashMap<>();
		dataMap.put(1L, "Ram,34");
		dataMap.put(2L, "Krishna,38");

		empCache.putAll(dataMap);

		printAllElementsFromCache(empCache);

		dataMap.put(1L, "Ram,44");
		empCache.putAll(dataMap);
		printAllElementsFromCache(empCache);

		cacheManager.close();
	}

}

Output

Print all the elements from the cache
1 is mapped to (Ram,34)
2 is mapped to (Krishna,38)

Print all the elements from the cache
1 is mapped to (Ram,44)
2 is mapped to (Krishna,38)

  

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