org.rocksdb

类 LRUCache

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.AbstractImmutableNativeReference

org.rocksdb.RocksObject

org.rocksdb.Cache

org.rocksdb.LRUCache

所有已实现的接口:

java.lang.AutoCloseable

public class LRUCache
extends Cache

Least Recently Used Cache

字段概要

从类继承的字段 org.rocksdb.RocksObject

nativeHandle_

从类继承的字段 org.rocksdb.AbstractImmutableNativeReference

owningHandle_

构造器概要

构造器

构造器和说明
LRUCache(long capacity) Create a new cache with a fixed size capacity
LRUCache(long capacity, int numShardBits) Create a new cache with a fixed size capacity.
LRUCache(long capacity, int numShardBits, boolean strictCapacityLimit) Create a new cache with a fixed size capacity.
LRUCache(long capacity, int numShardBits, boolean strictCapacityLimit, double highPriPoolRatio) Create a new cache with a fixed size capacity.
LRUCache(long capacity, int numShardBits, boolean strictCapacityLimit, double highPriPoolRatio, double lowPriPoolRatio) Create a new cache with a fixed size capacity.

方法概要

限定符和类型	方法和说明
protected void	disposeInternal(long handle)

从类继承的方法 org.rocksdb.Cache

getPinnedUsage, getUsage

从类继承的方法 org.rocksdb.RocksObject

disposeInternal, getNativeHandle

从类继承的方法 org.rocksdb.AbstractImmutableNativeReference

close, disOwnNativeHandle, isOwningHandle

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

LRUCache

public LRUCache(long capacity)

Create a new cache with a fixed size capacity

参数:

capacity - The fixed size capacity of the cache

LRUCache

public LRUCache(long capacity,
                int numShardBits)

Create a new cache with a fixed size capacity. The cache is sharded to 2^numShardBits shards, by hash of the key. The total capacity is divided and evenly assigned to each shard. numShardBits = -1 means it is automatically determined: every shard will be at least 512KB and number of shard bits will not exceed 6.

参数:

capacity - The fixed size capacity of the cache

numShardBits - The cache is sharded to 2^numShardBits shards, by hash of the key

LRUCache

public LRUCache(long capacity,
                int numShardBits,
                boolean strictCapacityLimit)

Create a new cache with a fixed size capacity. The cache is sharded to 2^numShardBits shards, by hash of the key. The total capacity is divided and evenly assigned to each shard. If strictCapacityLimit is set, insert to the cache will fail when cache is full. numShardBits = -1 means it is automatically determined: every shard will be at least 512KB and number of shard bits will not exceed 6.

参数:

capacity - The fixed size capacity of the cache

numShardBits - The cache is sharded to 2^numShardBits shards, by hash of the key

strictCapacityLimit - insert to the cache will fail when cache is full

LRUCache

public LRUCache(long capacity,
                int numShardBits,
                boolean strictCapacityLimit,
                double highPriPoolRatio)

Create a new cache with a fixed size capacity. The cache is sharded to 2^numShardBits shards, by hash of the key. The total capacity is divided and evenly assigned to each shard. If strictCapacityLimit is set, insert to the cache will fail when cache is full. User can also set percentage of the cache reserves for high priority entries via highPriPoolRatio. numShardBits = -1 means it is automatically determined: every shard will be at least 512KB and number of shard bits will not exceed 6.

参数:

capacity - The fixed size capacity of the cache

numShardBits - The cache is sharded to 2^numShardBits shards, by hash of the key

strictCapacityLimit - insert to the cache will fail when cache is full

highPriPoolRatio - percentage of the cache reserves for high priority entries

LRUCache

public LRUCache(long capacity,
                int numShardBits,
                boolean strictCapacityLimit,
                double highPriPoolRatio,
                double lowPriPoolRatio)

Create a new cache with a fixed size capacity. The cache is sharded to 2^numShardBits shards, by hash of the key. The total capacity is divided and evenly assigned to each shard. If strictCapacityLimit is set, insert to the cache will fail when cache is full. User can also set percentage of the cache reserves for high priority entries and low priority entries via highPriPoolRatio and lowPriPoolRatio. numShardBits = -1 means it is automatically determined: every shard will be at least 512KB and number of shard bits will not exceed 6.

参数:

capacity - The fixed size capacity of the cache

numShardBits - The cache is sharded to 2^numShardBits shards, by hash of the key

strictCapacityLimit - insert to the cache will fail when cache is full

highPriPoolRatio - percentage of the cache reserves for high priority entries

lowPriPoolRatio - percentage of the cache reserves for low priority entries

方法详细资料

disposeInternal

protected final void disposeInternal(long handle)

指定者:

disposeInternal 在类中 RocksObject