17.5. JCache インスタンスのクラスターリング
Data Grid JCache 実装は仕様を越え、標準 API を使用してクラスターキャッシュを使用できるようになります。次のようにキャッシュを複製するように設定された Data Grid 設定ファイルがあるとします。
infinispan.xml
<infinispan> <cache-container default-cache="namedCache"> <transport cluster="jcache-cluster" /> <replicated-cache name="namedCache" /> </cache-container> </infinispan>
<infinispan>
<cache-container default-cache="namedCache">
<transport cluster="jcache-cluster" />
<replicated-cache name="namedCache" />
</cache-container>
</infinispan>
このコードを使用して、キャッシュのクラスターを作成できます。
import javax.cache.*; import java.net.URI; // For multiple cache managers to be constructed with the standard JCache API // and live in the same JVM, either their names, or their classloaders, must // be different. // This example shows how to force their classloaders to be different. // An alternative method would have been to duplicate the XML file and give // it a different name, but this results in unnecessary file duplication. ClassLoader tccl = Thread.currentThread().getContextClassLoader(); CacheManager cacheManager1 = Caching.getCachingProvider().getCacheManager( URI.create("infinispan-jcache-cluster.xml"), new TestClassLoader(tccl)); CacheManager cacheManager2 = Caching.getCachingProvider().getCacheManager( URI.create("infinispan-jcache-cluster.xml"), new TestClassLoader(tccl)); Cache<String, String> cache1 = cacheManager1.getCache("namedCache"); Cache<String, String> cache2 = cacheManager2.getCache("namedCache"); cache1.put("hello", "world"); String value = cache2.get("hello"); // Returns "world" if clustering is working // -- public static class TestClassLoader extends ClassLoader { public TestClassLoader(ClassLoader parent) { super(parent); } }
import javax.cache.*;
import java.net.URI;
// For multiple cache managers to be constructed with the standard JCache API
// and live in the same JVM, either their names, or their classloaders, must
// be different.
// This example shows how to force their classloaders to be different.
// An alternative method would have been to duplicate the XML file and give
// it a different name, but this results in unnecessary file duplication.
ClassLoader tccl = Thread.currentThread().getContextClassLoader();
CacheManager cacheManager1 = Caching.getCachingProvider().getCacheManager(
URI.create("infinispan-jcache-cluster.xml"), new TestClassLoader(tccl));
CacheManager cacheManager2 = Caching.getCachingProvider().getCacheManager(
URI.create("infinispan-jcache-cluster.xml"), new TestClassLoader(tccl));
Cache<String, String> cache1 = cacheManager1.getCache("namedCache");
Cache<String, String> cache2 = cacheManager2.getCache("namedCache");
cache1.put("hello", "world");
String value = cache2.get("hello"); // Returns "world" if clustering is working
// --
public static class TestClassLoader extends ClassLoader {
public TestClassLoader(ClassLoader parent) {
super(parent);
}
}