ConcurrentCache (Eclipse RDF4J 4.3.2)

java.lang.Object
- org.eclipse.rdf4j.sail.lmdb.ConcurrentCache<K,V>

```
public class ConcurrentCache<K,V>
extends Object
```
Limited-size concurrent cache. The actual cleanup to keep the size limited is done once per CLEANUP_INTERVAL invocations of the protected method cleanUp. cleanUp method is called every time by put The maximum size is maintained approximately. Cleanup is not done if size is less than capacity + CLEANUP_INTERVAL / 2.

Field Summary

Fields
Modifier and Type Field Description

protected ConcurrentHashMap<K,V> cache

Constructor Summary

Constructors
Constructor Description

ConcurrentCache(int capacity)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`cleanUp()`
`void`	`clear()`
`V`	`get(Object key)`
`protected boolean`	`onEntryRemoval(K key)`
`V`	`put(K key, V value)`

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

Field Detail

cache

protected final ConcurrentHashMap<K,V> cache

Constructor Detail

ConcurrentCache

public ConcurrentCache(int capacity)

Method Detail

get
```
public V get(Object key)
```

put

public V put(K key,
             V value)

clear
```
public void clear()
```

onEntryRemoval
```
protected boolean onEntryRemoval(K key)
```
Parameters:

key - the key of the node to test for removal and do finalization on

Returns:

true if removal is approved

cleanUp
```
protected void cleanUp()
```