Question

我已关注ignite documentation并创建了我的商店适配器：

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);
    }
}

缓存适配器已注入缓存配置cacheConfiguration.setCacheStoreFactory(new FactoryBuilder.SingletonFactory<>(cacheStoreAdapter));

我同时遇到的问题很少：

看不到呼叫CacheStore.loadCache() | IgniteCache.loadCache()（应调用以下文档@Override public ChannelDetails load(Long key)）
看不到点燃@IgniteInstanceResource private Ignite ignite;

任何修复或检查的想法？ ...可能是我错过了重要部分，我应该在startTime或其他地方直接调用缓存加载？

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所有缓存的数据都会在缓存时保存到我的数据库中。在服务器启动服务器上，没有数据从db加载。

适配器的缓存配置部分：

cacheConfiguration.setCacheStoreFactory(new FactoryBuilder.SingletonFactory<>(cacheStoreAdapter));
// Configure cache to use store.
cacheConfiguration.setReadThrough(true);
cacheConfiguration.setWriteThrough(true);
// Enable database batching.
cacheConfiguration.setWriteBehindEnabled(true);

Ignite从Web服务器开始（在同一个jvm中，我知道它很难看，但我不能解释我的测试中断的原因。）

Answer 1

感谢Nikolay提出的建议。他没有提供代码，所以我认为在我的案例中知道如何解决它会很好。我有完整的解决方案。

在Ignite配置部分，我们应该调用

igniteConcreteCache.loadCache(
    (IgniteBiPredicate) (key, val) -> {
        System.out.println(" =========>>>> Loading [key=" + key + ", val=" + val + ']');
        return true;
    });

要从存储中加载数据，我们需要覆盖StoreAdapter中的对应方法：

@Override
public void loadCache(IgniteBiInClosure<Long, ChannelDetails> clo, Object... args) {
    LOGGER.trace("load cache...");
    super.loadCache(clo, args);
}

应该是：

@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.");
    }
}

这个解决方案并不完美（它有很多部分可以做得更好）但它有效，我们可以使用它。

Answer 2

Ignite不会隐式调用IgniteCache#loadCache方法。你应该自己做，否则只能通过获取操作从商店加载。

此外，我已检查并确保Ignite将本地实例注入商店。你怎么检查它？请注意，群集中的所有节点上的实例实例不能相同。 Ignite是分布式系统，该对象将在所有节点上进行序列化和预期化，并且该对象（cacheStoreAdapter）可能具有归档null。当Ignite调用商店时，你会看到这个注入。

IgniteCache不调用loadCache（）

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2 个答案: