How to inject a dependency bean to GridCacheStore implementation? - spring

Question

My config:
<bean parent="cache-template">
<property name="name" value="yagoLabel" />
<property name="cacheMode" value="PARTITIONED" />
<property name="atomicityMode" value="TRANSACTIONAL" />
<property name="distributionMode" value="PARTITIONED_ONLY" />
<property name="backups" value="1" />
<property name="store">
<bean class="id.ac.itb.ee.lskk.lumen.yago.YagoLabelCacheStore" autowire="byType" init-method="init" />
</property>
<property name="writeBehindEnabled" value="true" />
<property name="writeBehindFlushSize" value="102380" />
<property name="writeBehindFlushFrequency" value="30000" />
<property name="writeBehindBatchSize" value="10240" />
<property name="swapEnabled" value="false" />
<property name="evictionPolicy">
<bean class="org.gridgain.grid.cache.eviction.lru.GridCacheLruEvictionPolicy">
<property name="maxSize" value="102400" />
</bean>
</property>
</bean>
And I start GridGain as follows:
My GridCacheStore implementation:
public class YagoLabelCacheStore extends GridCacheStoreAdapter<String, YagoLabel> {
private static final Logger log = LoggerFactory
.getLogger(YagoLabelCacheStore.class);
private DBCollection labelColl;
#GridSpringResource(resourceName="mongoDb")
private DB db;
#Inject
private GridGainSpring grid;
#PostConstruct
public void init() {
log.info("Grid is {}", grid);
labelColl = db.getCollection("label");
}
I start GridGain as follows:
String entityId = "Muhammad";
try (AnnotationConfigApplicationContext appCtx
= new AnnotationConfigApplicationContext(LumenConfig.class)) {
Grid grid = appCtx.getBean(Grid.class);
GridCache<String, YagoLabel> labelCache = YagoLabel.cache(grid);
log.info("Label for {}: {}", entityId, labelCache.get(entityId));
}
LumenConfig Spring configuration contains a DB bean named mongoDb.
However this throws NullPointerException because db is not injected properly. I tried #Inject GridGainSpring just for testing, and even GridGainSpring itself is not injected.
I also tried setting <property name="db" ref="mongoDb"/> in the GridGain Config XML but Spring complains cannot find the bean.
My workaround is to put it inside a public static field but that's soo hacky: https://github.com/ceefour/lumen-kb/blob/b8445fbebd227fb7ac337c758a60badb7ecd3095/cli/src/main/java/id/ac/itb/ee/lskk/lumen/yago/YagoLabelCacheStore.java

Answer 1

The way is to load the GridConfiguration using Spring, then pass it to GridGainSpring.start() :
// "classpath:" is required, otherwise it won't be found in a WAR
#ImportResource("classpath:id/ac/itb/ee/lskk/lumen/core/lumen.gridgain.xml")
#Configuration
public static class GridGainConfig {
#Inject
private ApplicationContext appCtx;
#Inject
private GridConfiguration gridCfg;
#Bean(destroyMethod="close")
public Grid grid() throws GridException {
return GridGainSpring.start(gridCfg, appCtx);
}
}
:-)