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## org.apache.cassandra.cache
Class InstrumentingCache<K,V>

    java.lang.Object
      org.apache.cassandra.cache.InstrumentingCache<K,V>

All Implemented Interfaces:
  InstrumentingCacheMBean

Direct Known Subclasses:
  AutoSavingCache

    public class InstrumentingCache<K,V>

extends java.lang.Object
implements InstrumentingCacheMBean

Wraps an ICache in requests + hits tracking.

Constructor Summary
`InstrumentingCache(ICache<K,V> map, java.lang.String table, java.lang.String name)`

Method Summary
`void` | `clear()`
`V` | `get(K key)`
`int` | `getCapacity()`
`long` | `getHits()` total cache hit count since cache creation
`V` | `getInternal(K key)`
`java.util.Set<K>` | `getKeySet()`
`double` | `getRecentHitRate()` hits / requests since the last time getHitRate was called.
`long` | `getRequests()` total request count since cache creation
`int` | `getSize()`
`java.util.Set<K>` | `hotKeySet(int n)`
`boolean` | `isCapacitySetManually()`
`boolean` | `isPutCopying()`
`void` | `put(K key, V value)`
`void` | `remove(K key)`
`void` | `setCapacity(int capacity)`
`int` | `size()`
`void` | `updateCapacity(int capacity)`

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

Constructor Detail

### InstrumentingCache

    public InstrumentingCache(ICache<K,V> map,
                              java.lang.String table,
                              java.lang.String name)

Method Detail

### put

    public void put(K key,
                    V value)

### get

    public V get(K key)

### getInternal

    public V getInternal(K key)

### remove

    public void remove(K key)

### getCapacity

    public int getCapacity()

  Specified by:
    `getCapacity` in interface `InstrumentingCacheMBean`

### isCapacitySetManually

    public boolean isCapacitySetManually()

### updateCapacity

    public void updateCapacity(int capacity)

### setCapacity

    public void setCapacity(int capacity)

  Specified by:
    `setCapacity` in interface `InstrumentingCacheMBean`

### size

    public int size()

### getSize

    public int getSize()

  Specified by:
    `getSize` in interface `InstrumentingCacheMBean`

### getHits

    public long getHits()

  Description copied from interface: `InstrumentingCacheMBean`
  total cache hit count since cache creation

  Specified by:
    `getHits` in interface `InstrumentingCacheMBean`

### getRequests

    public long getRequests()

  Description copied from interface: `InstrumentingCacheMBean`
  total request count since cache creation

  Specified by:
    `getRequests` in interface `InstrumentingCacheMBean`

### getRecentHitRate

    public double getRecentHitRate()

  Description copied from interface: `InstrumentingCacheMBean`
  hits / requests since the last time getHitRate was called. serious telemetry apps should not use this, and should instead track the deltas from getHits / getRequests themselves, since those will not be affected by multiple users calling it. Provided for convenience only.

  Specified by:
    `getRecentHitRate` in interface `InstrumentingCacheMBean`

### clear

    public void clear()

### getKeySet

    public java.util.Set<K> getKeySet()

### hotKeySet

    public java.util.Set<K> hotKeySet(int n)

### isPutCopying

    public boolean isPutCopying()

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Copyright © 2011 The Apache Software Foundation