Package org.apache.cassandra.cache

Class CounterCacheKey

java.lang.Object

org.apache.cassandra.cache.CacheKey

org.apache.cassandra.cache.CounterCacheKey

All Implemented Interfaces:

IMeasurableMemory

public final class CounterCacheKey
extends CacheKey

Field Summary

Fields inherited from class org.apache.cassandra.cache.CacheKey

indexName, tableId

Method Summary

Modifier and Type	Method	Description
static CounterCacheKey	create(TableMetadata tableMetadata, ByteBuffer partitionKey, Clustering<?> clustering, ColumnMetadata c, CellPath path)
boolean	equals(Object o)
int	hashCode()
ByteBuffer	partitionKey()
static CounterCacheKey	read(TableMetadata tableMetadata, DataInputPlus in)
ByteBuffer	readCounterValue(ColumnFamilyStore cfs)	Reads the value of the counter represented by this key.
String	toString()
long	unsharedHeapSize()
void	write(DataOutputPlus out)

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

sameTable

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Details

create

public static CounterCacheKey create(TableMetadata tableMetadata,
 ByteBuffer partitionKey,
 Clustering<?> clustering,
 ColumnMetadata c,
 CellPath path)

partitionKey

public ByteBuffer partitionKey()

readCounterValue

public ByteBuffer readCounterValue(ColumnFamilyStore cfs)

Reads the value of the counter represented by this key.

Parameters:

cfs - the store for the table this is a key of.

Returns:

the value for the counter represented by this key, or null if there is not such counter.

write

public void write(DataOutputPlus out)
           throws IOException

Throws:

IOException

read

public static CounterCacheKey read(TableMetadata tableMetadata,
 DataInputPlus in)
                            throws IOException

Throws:

IOException

unsharedHeapSize

public long unsharedHeapSize()

Returns:

the amount of on-heap memory retained by the object that might be reclaimed if the object were reclaimed, i.e. it should try to exclude globally cached data where possible, or counting portions of arrays that are referenced by the object but used by other objects only (e.g. slabbed byte-buffers), etc.

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object