com.apple.foundationdb.record.provider.foundationdb.storestate

Class PassThroughRecordStoreStateCache

java.lang.Object

com.apple.foundationdb.record.provider.foundationdb.storestate.PassThroughRecordStoreStateCache

All Implemented Interfaces:

FDBRecordStoreStateCache

@API(value=EXPERIMENTAL)
public class PassThroughRecordStoreStateCache
extends Object
implements FDBRecordStoreStateCache

An implementation of the FDBRecordStoreStateCache interface that does not actually cache anything. This should be used if caching the record store state is not desired. For example, this might be the case if the cache miss rate is high and therefore keeping the machinery around to maintain the cache is not worth the cost. This is also the default implementation.

Note that this class is a singleton as it requires no state.

Method Summary

Modifier and Type	Method and Description
void	clear() Remove all entries from the cache.
CompletableFuture<FDBRecordStoreStateCacheEntry>	get(FDBRecordStore recordStore, FDBRecordStoreBase.StoreExistenceCheck existenceCheck) Load the record store state for the record store stored at the given location.
static PassThroughRecordStoreStateCache	instance()
void	validateDatabase(FDBDatabase database)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.apple.foundationdb.record.provider.foundationdb.storestate.FDBRecordStoreStateCache

validateContext

Method Detail

get

@Nonnull
public CompletableFuture<FDBRecordStoreStateCacheEntry> get(@Nonnull
                                                                     FDBRecordStore recordStore,
                                                                     @Nonnull
                                                                     FDBRecordStoreBase.StoreExistenceCheck existenceCheck)

Description copied from interface: FDBRecordStoreStateCache

Load the record store state for the record store stored at the given location. If this information is available in the cache, it will be served from memory without communicating with the database. Otherwise, the information may require performing network and disk I/O. Note that the cache entry returned should be consistent with the view of the database as viewed by the transaction provided as input. The cache implementations are generally differentiated by the manner in which they invalidate data to ensure that the value returned is consistent with this contract.

This method should generally not be called by clients importing the Record Layer.

Specified by:

get in interface FDBRecordStoreStateCache

Parameters:

recordStore - the record store to load the store state of

existenceCheck - whether to error if the store does or does not exist

Returns:

a future that will complete with the cached store state

validateDatabase

public void validateDatabase(@Nonnull
                             FDBDatabase database)

Specified by:

validateDatabase in interface FDBRecordStoreStateCache

clear

public void clear()

Description copied from interface: FDBRecordStoreStateCache

Remove all entries from the cache.

Specified by:

clear in interface FDBRecordStoreStateCache

instance

@Nonnull
public static PassThroughRecordStoreStateCache instance()