WindowTinyLfuPolicy (simulator 3.1.5 API)

java.lang.Object
- com.github.benmanes.caffeine.cache.simulator.policy.sketch.WindowTinyLfuPolicy

All Implemented Interfaces:

Policy, Policy.KeyOnlyPolicy
```
public final class WindowTinyLfuPolicy
extends Object
implements Policy.KeyOnlyPolicy
```
An adaption of the TinyLfu policy that adds a temporal admission window. This window allows the policy to have a high hit rate when entries exhibit a high temporal / low frequency pattern.
A new entry starts in the window and remains there as long as it has high temporal locality. Eventually an entry will slip from the end of the window onto the front of the main queue. If the main queue is already full, then a historic frequency filter determines whether to evict the newly admitted entry or the victim entry chosen by main queue's policy. This process ensures that the entries in the main queue have both a high recency and frequency. The window space uses LRU and the main uses Segmented LRU.
Scan resistance is achieved by means of the window. Transient data will pass through from the window and not be accepted into the main queue. Responsiveness is maintained by the main queue's LRU and the TinyLfu's reset operation so that expired long term entries fade away.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class WindowTinyLfuPolicy.WindowTinyLfuSettings
- Nested classes/interfaces inherited from interface com.github.benmanes.caffeine.cache.simulator.policy.Policy
  Policy.Characteristic, Policy.KeyOnlyPolicy, Policy.PolicySpec

Constructor Summary

Constructors
Constructor Description

WindowTinyLfuPolicy(double percentMain, WindowTinyLfuPolicy.WindowTinyLfuSettings settings)

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`finished()`	Indicates that the recording has completed.
`static Set<Policy>`	`policies(Config config)`	Returns all variations of this policy based on the configuration parameters.
`void`	`record(long key)`
`PolicyStats`	`stats()`	Returns the cache efficiency statistics.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.github.benmanes.caffeine.cache.simulator.policy.Policy
name

Methods inherited from interface com.github.benmanes.caffeine.cache.simulator.policy.Policy.KeyOnlyPolicy
record

- Constructor Detail
  - WindowTinyLfuPolicy
```
public WindowTinyLfuPolicy(double percentMain,
                           WindowTinyLfuPolicy.WindowTinyLfuSettings settings)
```
- Method Detail
  - policies
```
public static Set<Policy> policies(Config config)
```
    Returns all variations of this policy based on the configuration parameters.
  - stats
```
public PolicyStats stats()
```
    Description copied from interface: Policy
    
    Returns the cache efficiency statistics.
    
    Specified by:
    
    stats in interface Policy
  - record
```
public void record(long key)
```
    Specified by:
    
    record in interface Policy.KeyOnlyPolicy
  - finished
```
public void finished()
```
    Description copied from interface: Policy
    
    Indicates that the recording has completed.
    
    Specified by:
    
    finished in interface Policy