NearCacheWithInvalidation.java

package com.hazelcast.examples;

import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.IMap;

import static com.hazelcast.examples.helper.HazelcastUtils.generateKeyOwnedBy;

public class NearCacheWithInvalidation extends NearCacheSupport {

    public static void main(String[] args) {
        HazelcastInstance[] instances = initCluster(2);
        IMap<String, Article> map1 = instances[0].getMap("articlesInvalidation");
        IMap<String, Article> map2 = instances[1].getMap("articlesInvalidation");

        String key = generateKeyOwnedBy(serverInstance);

        map2.put(key, new Article("foo"));
        printNearCacheStats(map1, "The map2.put(key, new Article(\"foo\")) call has no effect on the Near Cache of map1");

        map1.get(key);
        printNearCacheStats(map1, "The first map1.get(key) call populates the Near Cache");

        map2.put(key, new Article("bar"));
        printNearCacheStats(map1, "The map2.put(key, new Article(\"bar\")) call will invalidate the Near Cache on map1");

        waitForInvalidationEvents();
        printNearCacheStats(map1, "The Near Cache of map1 is empty after the invalidation event has been processed");

        map1.get(key);
        printNearCacheStats(map1, "The next map1.get(key) call populates the Near Cache again");

        shutdown();
    }
}