PageReplacementPolicy (HerdDB Utils 0.28.0 API)

All Known Implementing Classes:

ClockAdaptiveReplacement, ClockProPolicy, RandomPageReplacementPolicy
```
public interface PageReplacementPolicy
```
Cache replacement policy for memory pagination.
A PageReplacementPolicy will not load or unload memory pages but will keep track of their usage and instruct the system about which page need to be replaced.

Author:

diego.salvi

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Page.Metadata`	`add(Page<?> page)`	Add a new `Page` to memory.
`int`	`capacity()`	Returns the maximum number of `Pages` memorizable.
`void`	`clear()`	Clear any memorized data.
`void`	`pageHit(Page<?> page)`	Track a page cache hit.
`boolean`	`remove(Page<?> page)`	Remove a `Page` from memory.
`<P extends Page<?>> void`	`remove(Collection<P> pages)`	Remove many `Page Pages` from memory.
`int`	`size()`	Returns the current number of `Pages` memorized.

- Method Detail
  - pageHit
```
void pageHit(Page<?> page)
```
    Track a page cache hit.
    
    Parameters:
    
    page - for which track an hit
  - add
```
Page.Metadata add(Page<?> page)
```
    Add a new Page to memory.
    Adding a new page could force an older page to be unloaded
    
    Parameters:
    
    page - page to be added
    
    Returns:
    
    selected page to be unloaded or null
  - remove
```
boolean remove(Page<?> page)
```
    Remove a Page from memory.
    
    Parameters:
    
    page - page to be removed.
    
    Returns:
    
    true if the memory really contained the given page
  - remove
```
<P extends Page<?>> void remove(Collection<P> pages)
```
    Remove many Page Pages from memory.
    This method is logically equivalent to multiple remove(Page) invocations but is expected to be more efficient.
    
    Parameters:
    
    pages - pages to be removed.
  - size
```
int size()
```
    Returns the current number of Pages memorized.
    
    Returns:
    
    current number of Pages
  - capacity
```
int capacity()
```
    Returns the maximum number of Pages memorizable.
    
    Returns:
    
    maximum number of Pages
  - clear
```
void clear()
```
    Clear any memorized data.