Question

我目前正在尝试将HazelCast缓存与jcache对象集成，以我的开发为基础。

我需要集成大量不同的配置，为此我创建了一个hazelcast.xml。在我尝试使用hazelcast地图对象（com.hazelcast.core.IMap）时，我得到了它，所以我可以使用适当的配置获取缓存：

private static void initHazelcast() {
        log.info("initHazelcast()");

        Config cfg = null;
        try {
            cfg = new XmlConfigBuilder("./src/main/resources/hazelcast.xml").build();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        hazelcastInstance = Hazelcast.newHazelcastInstance(cfg);

        IMap map = hazelcastInstance.getMap("EXPIR00001");

        log.info("initHazelcast() End");
    }

HazelCast.xml：

<hazelcast  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.hazelcast.com/schema/config http://www.hazelcast.com/schema/config/hazelcast-config-3.9.xsd"
    xmlns="http://www.hazelcast.com/schema/config">
  <map name="EXPIR00001">
    <time-to-live-seconds>1</time-to-live-seconds>
    <max-idle-seconds>1</max-idle-seconds>
    <eviction-policy>LRU</eviction-policy>
    <max-size policy="PER_NODE">5000</max-size>
  </map>
</hazelcast>

现在我尝试使用JCache的类javax.cache.Cache。

我正在使用此示例，但我没有像这样检索xml配置：

http://docs.hazelcast.org/docs/3.9.3/manual/html-single/index.html#jcache-declarative-configuration 和 http://docs.hazelcast.org/docs/3.9.3/manual/html-single/index.html#scoping-to-join-clusters

Hazelcast.xml：

<hazelcast  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.hazelcast.com/schema/config http://www.hazelcast.com/schema/config/hazelcast-config-3.9.xsd"
    xmlns="http://www.hazelcast.com/schema/config">

    <cache name="EXPIR00001">
      <backup-count>1</backup-count>
      <async-backup-count>1</async-backup-count>
      <in-memory-format>BINARY</in-memory-format>
      <eviction size="10000" max-size-policy="ENTRY_COUNT" eviction-policy="LRU" />
       <expiry-policy-factory>
                    <timed-expiry-policy-factory expiry-policy-type="CREATED"
                                                    duration-amount="1"
                                                    time-unit="DAYS"/>
       </expiry-policy-factory>
    </cache>

</hazelcast>

方法java：

private static void initHazelcast() {
        log.info("initHazelcast()");

        Config cfg = null;
        try {
            cfg = new XmlConfigBuilder("./src/main/resources/hazelcast.xml").build();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        hazelcastInstance = Hazelcast.newHazelcastInstance(cfg);

        CacheManager manager = Caching.getCachingProvider().getCacheManager();
        //In JCache
        Cache<byte[], byte[]> cache = manager.getCache( "EXPIR00001" );

        log.info("initHazelcast() End");
    }

CacheManager管理器如何与hazelcast intance相关??管理器对象不检索缓存Id =“EXPIR00001”

我需要从xml文件配置，decalratively（Hazelcast.xml）。我们可能需要许多配置。

我无法使用： http://docs.hazelcast.org/docs/3.9.3/manual/html-single/index.html#hazelcast-jcache

Answer 1

以下是http://docs.hazelcast.org/docs/3.9.3/manual/html-single/index.html#hazelcast-jcache

的第一个示例代码

// Retrieve the CachingProvider which is automatically backed by
// the chosen Hazelcast member or client provider
CachingProvider cachingProvider = Caching.getCachingProvider();

// Create a CacheManager
CacheManager cacheManager = cachingProvider.getCacheManager();

// Create a simple but typesafe configuration for the cache
CompleteConfiguration<String, String> config =
    new MutableConfiguration<String, String>()
        .setTypes( String.class, String.class );

// Create and get the cache
Cache<String, String> cache = cacheManager.createCache( "example", config );
// Alternatively to request an already existing cache
// Cache<String, String> cache = cacheManager
//     .getCache( name, String.class, String.class );

// Put a value into the cache
cache.put( "world", "Hello World" );

// Retrieve the value again from the cache
String value = cache.get( "world" );

// Print the value 'Hello World'
System.out.println( value );

关于JCache的Hazelcast集成如何工作的解释：

首先，我们使用检索javax.cache.spi.CachingProvider 来自javax.cache.Caching :: getCachingManager的静态方法自动选择Hazelcast作为底层JCache 实现，如果在类路径中可用。这样，Hazelcast CachingProvider的实现会自动启动一个新的 Hazelcast会员或客户（取决于所选的提供商类型）和从命令行参数或中获取配置从类路径。我们将展示如何使用现有的本章后面的HazelcastInstance;现在，我们保持简单。

我建议你阅读文档，你会找到很多问题的答案。

Answer 2

我发现了错误，我的目的是将经理作为一个静态变量留在课堂上。

CacheManager manager = Caching.getCachingProvider().getCacheManager();

将此行替换为：

CachingProvider caching = Caching.getCachingProvider();
CacheManager cacheManager = caching.getCacheManager();

完整示例： http://docs.hazelcast.org/docs/3.9.3/manual/html-single/index.html#scoping-to-join-clusters

淡化广播中的Jcache集成不起作用

2 个答案: