org.apache.ignite.cache.store

## Interface CacheStore<K,V>

- All Superinterfaces:
    javax.cache.integration.CacheLoader<K,V>, javax.cache.integration.CacheWriter<K,V>
  All Known Implementing Classes:
    CacheAbstractJdbcStore, CacheJdbcBlobStore, CacheJdbcPojoStore, CacheLoadOnlyStoreAdapter, CacheStoreAdapter, CassandraCacheStore

      public interface CacheStore<K,V>
      extends javax.cache.integration.CacheLoader<K,V>, javax.cache.integration.CacheWriter<K,V>

  API for cache persistent storage for read-through and write-through behavior. Persistent store is configured via `CacheConfiguration.getCacheStoreFactory()` configuration property. If not provided, values will be only kept in cache memory or swap storage without ever being persisted to a persistent storage.

  `CacheStoreAdapter` provides default implementation for bulk operations, such as `CacheLoader.loadAll(Iterable)`, `CacheWriter.writeAll(Collection)`, and `CacheWriter.deleteAll(Collection)` by sequentially calling corresponding `CacheLoader.load(Object)`, `CacheWriter.write(javax.cache.Cache.Entry)`, and `CacheWriter.delete(Object)` operations. Use this adapter whenever such behaviour is acceptable. However in many cases it maybe more preferable to take advantage of database batch update functionality, and therefore default adapter implementation may not be the best option.

  Provided implementations may be used for test purposes:

  - `CacheHibernateBlobStore`
  - `CacheJdbcBlobStore`

  All transactional operations of this API are provided with ongoing `Transaction`, if any. You can attach any metadata to it, e.g. to recognize if several operations belong to the same transaction or not. Here is an example of how attach a JDBC connection as transaction metadata:

       Connection conn = tx.meta("some.name");

       if (conn == null) {
           conn = ...; // Get JDBC connection.

           // Store connection in transaction metadata, so it can be accessed
           // for other operations on the same transaction.
           tx.addMeta("some.name", conn);
       }

  See Also:
    `CacheStoreSession`

- - ### Method Summary

    All Methods Instance Methods Abstract Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `loadCache(IgniteBiInClosure<K,V> clo, Object... args)` Loads all values from underlying persistent storage.
    `void` | `sessionEnd(boolean commit)` Deprecated. Use `CacheStoreSessionListener` instead (refer to its JavaDoc for details).

    - ### Methods inherited from interface javax.cache.integration.CacheLoader

      `load, loadAll`

    - ### Methods inherited from interface javax.cache.integration.CacheWriter

      `delete, deleteAll, write, writeAll`

- - ### Method Detail

    - #### loadCache

          void loadCache(IgniteBiInClosure<K,V> clo,
                         @Nullable
                         Object... args)
                  throws javax.cache.integration.CacheLoaderException

      Loads all values from underlying persistent storage. Note that keys are not passed, so it is up to implementation to figure out what to load. This method is called whenever `IgniteCache.loadCache(IgniteBiPredicate, Object...)` method is invoked which is usually to preload the cache from persistent storage.

      This method is optional, and cache implementation does not depend on this method to do anything. Default implementation of this method in `CacheStoreAdapter` does nothing.

      For every loaded value method `IgniteBiInClosure.apply(Object, Object)` should be called on the passed in closure. The closure will then make sure that the loaded value is stored in cache.

      Parameters:
        `clo` - Closure for loaded values.
        `args` - Arguments passes into `IgniteCache.loadCache(IgniteBiPredicate, Object...)` method.
      Throws:
        `javax.cache.integration.CacheLoaderException` - If loading failed.

    - #### sessionEnd

          @Deprecated
          void sessionEnd(boolean commit)
                               throws javax.cache.integration.CacheWriterException

      Deprecated. Use `CacheStoreSessionListener` instead (refer to its JavaDoc for details).
      Tells store to commit or rollback a transaction depending on the value of the `'commit'` parameter.
      Parameters:
        `commit` - `True` if transaction should commit, `false` for rollback.
      Throws:
        `javax.cache.integration.CacheWriterException` - If commit or rollback failed. Note that commit failure in some cases may bring cache transaction into `TransactionState.UNKNOWN` which will consequently cause all transacted entries to be invalidated.

2020 Copyright © Apache Software Foundation
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Ignite Database and Caching Platform | : ver. 2.9.0
Release Date | : October 15 2020