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

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

All Implemented Interfaces:

InstrumentingCacheMBean

Direct Known Subclasses:

AutoSavingKeyCache, AutoSavingRowCache

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

Nested Class Summary

class

AutoSavingCache.Writer

Field Summary

protected ColumnFamilyStore.CacheType	cacheType
protected java.lang.String	cfName
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
protected java.lang.String	tableName

Constructor Summary

AutoSavingCache(ICache<K,V> cache, java.lang.String tableName, java.lang.String cfName, ColumnFamilyStore.CacheType cacheType)

Method Summary

int	getAdjustedCacheSize(long expectedKeys)
java.io.File	getCachePath()
abstract double	getConfiguredCacheSize(CFMetaData cfm)
AutoSavingCache.Writer	getWriter(int keysToSave)
java.util.Set<DecoratedKey>	readSaved()
void	reduceCacheSize()
void	scheduleSaving(int savePeriodInSeconds, int keysToSave)
java.util.concurrent.Future<?>	submitWrite(int keysToSave)
abstract java.nio.ByteBuffer	translateKey(K key)
void	updateCacheSize(long keys) Resizes the cache based on a key estimate.

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

clear, get, getCapacity, getHits, getInternal, getKeySet, getRecentHitRate, getRequests, getSize, hotKeySet, isCapacitySetManually, isPutCopying, put, remove, setCapacity, size, updateCapacity

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.

cfName

protected final java.lang.String cfName

tableName

protected final java.lang.String tableName

saveTask

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

cacheType

protected final ColumnFamilyStore.CacheType cacheType

Constructor Detail

AutoSavingCache

public AutoSavingCache(ICache<K,V> cache,
                       java.lang.String tableName,
                       java.lang.String cfName,
                       ColumnFamilyStore.CacheType cacheType)

Method Detail

translateKey

public abstract java.nio.ByteBuffer translateKey(K key)

getConfiguredCacheSize

public abstract double getConfiguredCacheSize(CFMetaData cfm)

getAdjustedCacheSize

public int getAdjustedCacheSize(long expectedKeys)

getCachePath

public java.io.File getCachePath()

getWriter

public AutoSavingCache.Writer getWriter(int keysToSave)

scheduleSaving

public void scheduleSaving(int savePeriodInSeconds,
                           int keysToSave)

submitWrite

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

readSaved

public java.util.Set<DecoratedKey> readSaved()

updateCacheSize

public void updateCacheSize(long keys)

Resizes the cache based on a key estimate. Caller is in charge of synchronizing this correctly if needed

reduceCacheSize

public void reduceCacheSize()