org.apache.cassandra.cache
Class AutoSavingCache<K extends CacheKey,V>

java.lang.Object
  org.apache.cassandra.cache.InstrumentingCache<K,V>
      org.apache.cassandra.cache.AutoSavingCache<K,V>

public class AutoSavingCache<K extends CacheKey,V>
extends InstrumentingCache<K,V>

Nested Class Summary

class

AutoSavingCache.Writer

Field Summary

protected CacheService.CacheType	cacheType
static java.util.concurrent.atomic.AtomicBoolean	flushInProgress True if a cache flush is currently executing: only one may execute at a time.
protected java.util.concurrent.ScheduledFuture<?>	saveTask

Constructor Summary

AutoSavingCache(ICache<K,V> cache, CacheService.CacheType cacheType)

Method Summary

int	estimateSizeToSave(java.util.Set<K> keys)
java.io.File	getCachePath(java.lang.String ksName, java.lang.String cfName)
AutoSavingCache.Writer	getWriter(int keysToSave)
java.util.Set<DecoratedKey>	readSaved(java.lang.String ksName, java.lang.String cfName)
void	reduceCacheSize()
void	scheduleSaving(int savePeriodInSeconds, int keysToSave)
java.util.concurrent.Future<?>	submitWrite(int keysToSave)

Methods inherited from class org.apache.cassandra.cache.InstrumentingCache

clear, containsKey, get, getCapacity, getHits, getInternal, getKeySet, getRecentHitRate, getRequests, hotKeySet, isCapacitySetManually, isPutCopying, put, putIfAbsent, remove, replace, setCapacity, size, updateCapacity, weightedSize

Methods inherited from class java.lang.Object

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

Field Detail

flushInProgress

public static final java.util.concurrent.atomic.AtomicBoolean flushInProgress

True if a cache flush is currently executing: only one may execute at a time.

saveTask

protected volatile java.util.concurrent.ScheduledFuture<?> saveTask

cacheType

protected final CacheService.CacheType cacheType

Constructor Detail

AutoSavingCache

public AutoSavingCache(ICache<K,V> cache,
                       CacheService.CacheType cacheType)

Method Detail

getCachePath

public java.io.File getCachePath(java.lang.String ksName,
                                 java.lang.String cfName)

getWriter

public AutoSavingCache.Writer getWriter(int keysToSave)

scheduleSaving

public void scheduleSaving(int savePeriodInSeconds,
                           int keysToSave)

readSaved

public java.util.Set<DecoratedKey> readSaved(java.lang.String ksName,
                                             java.lang.String cfName)

submitWrite

public java.util.concurrent.Future<?> submitWrite(int keysToSave)

reduceCacheSize

public void reduceCacheSize()

estimateSizeToSave

public int estimateSizeToSave(java.util.Set<K> keys)