Package org.restheart.mongodb.db

Class CursorPool

java.lang.Object

org.restheart.mongodb.db.CursorPool

public class CursorPool
extends Object

Author:

Andrea Di Cesare <andrea@softinstigate.com>

Field Summary

Fields

Modifier and Type	Field	Description
static double	MIN_SKIP_DISTANCE_PERCENTAGE	Cursor in the pool won't be used if REQUESTED_SKIPS - POOL_SKIPS > MIN_SKIP_DISTANCE_PERCENTAGE * REQUESTED_SKIPS. The cursor from the pool need to be iterated via the next() method (REQUESTED_SKIPS - POOL_SKIPS) times to reach the requested page; since skip() is more efficient than next(), using the cursor in the pool is worthwhile only if next() has to be used less than MIN_SKIP_DISTANCE_PERCENTAGE * REQUESTED_SKIPS times.

Method Summary

Modifier and Type	Method	Description
SkippedFindIterable	get(CursorPoolEntryKey key, ExchangeKeys.EAGER_CURSOR_ALLOCATION_POLICY allocationPolicy)
static CursorPool	getInstance()

Methods inherited from class java.lang.Object

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

Field Detail

MIN_SKIP_DISTANCE_PERCENTAGE

public static final double MIN_SKIP_DISTANCE_PERCENTAGE

Cursor in the pool won't be used if
REQUESTED_SKIPS - POOL_SKIPS > MIN_SKIP_DISTANCE_PERCENTAGE * REQUESTED_SKIPS.
The cursor from the pool need to be iterated via the next() method (REQUESTED_SKIPS - POOL_SKIPS) times to reach the requested page; since skip() is more efficient than next(), using the cursor in the pool is worthwhile only if next() has to be used less than MIN_SKIP_DISTANCE_PERCENTAGE * REQUESTED_SKIPS times.

See Also:

Constant Field Values

Method Detail

getInstance

public static CursorPool getInstance()

Returns:

get

public SkippedFindIterable get(CursorPoolEntryKey key,
                               ExchangeKeys.EAGER_CURSOR_ALLOCATION_POLICY allocationPolicy)

Parameters:

key -

allocationPolicy -

Returns: