com.persistit

Class TreeStatistics

java.lang.Object

com.persistit.TreeStatistics

public class TreeStatistics
extends Object

Collection of AtomicLong counters representing interesting statistics in a Tree. The store(byte[], int) and load(byte[], int, int) methods are designed to serialize and deserialize evolving versions of this class, therefore it is possible to add and remove new counters while remaining compatible with prior versions.

Currently implemented counters include:

• Fetch
• Traverse
• Store
• Remove

Constructor Summary

Constructors

Constructor and Description
TreeStatistics()

Method Summary

Modifier and Type	Method and Description
long	getFetchCounter()
long	getRemoveCounter()
long	getStoreCounter()
long	getTraverseCounter()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

TreeStatistics

public TreeStatistics()

Method Detail

toString

public String toString()

Overrides:

toString in class Object

getFetchCounter

public long getFetchCounter()

Returns:

the count of Exchange.fetch() operations, including Exchange.fetchAndStore() and Exchange.fetchAndRemove() operations

getTraverseCounter

public long getTraverseCounter()

Returns:

the count of Exchange.traverse(com.persistit.Key.Direction, boolean) operations including Exchange.next() and Exchange.previous()

getStoreCounter

public long getStoreCounter()

Returns:

the count of Exchange.store(com.persistit.Key, com.persistit.Value) operations, including Exchange.fetchAndStore()

getRemoveCounter

public long getRemoveCounter()

Returns:

the count of Exchange.remove() operations, including Exchange.fetchAndRemove() operations