[英]IgniteCache does not call loadCache()
我遵循了點燃文檔並創建了商店適配器:
import java.io.Serializable;
import java.util.Map;
import java.util.Optional;
import javax.cache.Cache;
import javax.cache.integration.CacheLoaderException;
import javax.cache.integration.CacheWriterException;
import org.apache.ignite.Ignite;
import org.apache.ignite.cache.store.CacheStoreAdapter;
import org.apache.ignite.lang.IgniteBiInClosure;
import org.apache.ignite.resources.IgniteInstanceResource;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.my.calendar.dao.jpa.ChannelDetailsJpaRepository;
import com.my.calendar.entity.ChannelDetails;
@Service
public class CacheChannelStoreAdapter extends CacheStoreAdapter<Long, ChannelDetails> implements Serializable {
private static final Logger LOGGER = LogManager.getLogger(CacheChannelStoreAdapter.class);
private static ChannelDetailsJpaRepository channelDetailsJpaRepository;
// Will be automatically injected. !!! apacheignite info, but it DOES NOT
@IgniteInstanceResource
private Ignite ignite;
public Ignite getIgnite() {
return ignite;
}
public void setIgnite(Ignite ignite) {
this.ignite = ignite;
}
@Autowired
public CacheChannelStoreAdapter(ChannelDetailsJpaRepository channelDetailsJpaRepository) {
this.channelDetailsJpaRepository = channelDetailsJpaRepository;
}
@Override
public void loadCache(IgniteBiInClosure<Long, ChannelDetails> clo, Object... args) {
LOGGER.trace("load cache...");
super.loadCache(clo, args);
}
@Override
public Map<Long, ChannelDetails> loadAll(Iterable<? extends Long> keys) {
LOGGER.trace("load all. keys: {}", keys);
return super.loadAll(keys);
}
@Override
public ChannelDetails load(Long key) throws CacheLoaderException {
LOGGER.debug("object to load: {}", key);
return channelDetailsJpaRepository.findOne(key);
}
@Override
public void write(Cache.Entry<? extends Long, ? extends ChannelDetails> entry) throws CacheWriterException {
LOGGER.debug("object to save: {}", entry);
Optional.ofNullable(entry)
.map(Cache.Entry::getValue)
.ifPresent(channelDetailsJpaRepository::save);
}
@Override
public void delete(Object key) throws CacheWriterException {
LOGGER.debug("object to delete: {}", key);
Optional.ofNullable(key)
.filter(Long.class::isInstance)
.map(Long.class::cast )
.ifPresent(channelDetailsJpaRepository::delete);
}
}
緩存適配器已注入到緩存配置中cacheConfiguration.setCacheStoreFactory(new FactoryBuilder.SingletonFactory<>(cacheStoreAdapter));
我同時遇到幾個問題:
CacheStore.loadCache()
調用| IgniteCache.loadCache()
(應調用以下文檔@Override public ChannelDetails load(Long key)
) @IgniteInstanceResource private Ignite ignite;
注入的@IgniteInstanceResource private Ignite ignite;
有修復或檢查的想法嗎? ...可能錯過了重要的部分,我應該直接在startTime或其他地方調用緩存加載嗎?
在緩存時,所有緩存的數據都保存到我的數據庫中。 在服務器啟動服務器時,沒有從db加載數據。
我的適配器的緩存配置部分:
cacheConfiguration.setCacheStoreFactory(new FactoryBuilder.SingletonFactory<>(cacheStoreAdapter));
// Configure cache to use store.
cacheConfiguration.setReadThrough(true);
cacheConfiguration.setWriteThrough(true);
// Enable database batching.
cacheConfiguration.setWriteBehindEnabled(true);
Ignite從Web服務器開始(在同一個jvm
,我知道它很丑陋,但是我不能將我的測試弄壞)。
感謝Nikolay的建議。 他沒有提供代碼,所以我認為最好解決我的問題。 我有完整的解決方案。
在Ignite
配置部分,我們應該調用
igniteConcreteCache.loadCache(
(IgniteBiPredicate) (key, val) -> {
System.out.println(" =========>>>> Loading [key=" + key + ", val=" + val + ']');
return true;
});
要從存儲中加載數據,我們需要在StoreAdapter
重寫對應方法:
@Override
public void loadCache(IgniteBiInClosure<Long, ChannelDetails> clo, Object... args) {
LOGGER.trace("load cache...");
super.loadCache(clo, args);
}
應該 :
@Override
public void loadCache(IgniteBiInClosure<Long, ChannelDetails> clo, Object... args) {
LOGGER.trace("Load all cache data from db. this part should be used if Ignite starts.");
if (args == null || args.length == 0) {
channelDetailsJpaRepository.findAll()
.forEach(channelDetails -> clo.apply(channelDetails.getId(), channelDetails));
} else {
throw new NotImplementedException("Handle to load objects by id collection.");
}
}
這個解決方案不是完美的(它有很多部分可以做得更好),但是它可以工作並且我們可以使用它。
Ignite不會隱式調用IgniteCache#loadCache
方法。 您應該自己進行操作,否則只能通過get操作從存儲中加載條目。
另外,我已經檢查並確保Ignite將本地實例注入商店。 您如何檢查? 請注意,存儲實例在集群中的所有節點上都不能相同。 Ignite是分布式系統,此對象將在所有節點上進行序列化和反序列化,並且該對象(cacheStoreAdapter)的文件名可能恰好為null
。 當Ignite調用store時,您應該會看到此注入。
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