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# Namespace Apache.Ignite.Core.Cache.Eviction

### Classes

#### EvictionPolicyBase

Base class for predefined eviction policies.

#### FifoEvictionPolicy

Eviction policy based on First In First Out (FIFO) algorithm with batch eviction support.

The eviction starts in the following cases: The cache size becomes BatchSize elements greater than the maximum size; The size of cache entries in bytes becomes greater than the maximum memory size; The size of cache entry calculates as sum of key size and value size.

Note: Batch eviction is enabled only if maximum memory limit isn't set.

This implementation is very efficient since it does not create any additional table-like data structures. The FIFO ordering information is maintained by attaching ordering metadata to cache entries.

#### LruEvictionPolicy

Eviction policy based on Least Recently Used (LRU) algorithm with batch eviction support.

The eviction starts in the following cases: The cache size becomes { @code batchSize } elements greater than the maximum size; The size of cache entries in bytes becomes greater than the maximum memory size; The size of cache entry calculates as sum of key size and value size.

Note: Batch eviction is enabled only if maximum memory limit isn't set.

This implementation is very efficient since it does not create any additional table-like data structures. The LRU ordering information is maintained by attaching ordering metadata to cache entries.

### Interfaces

#### IEvictionPolicy

Represents a cache eviction policy. Only predefined implementations are supported now: LruEvictionPolicy, FifoEvictionPolicy.