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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
package org.rocksdb;
/**
* Least Recently Used Cache
*/
public class LRUCache extends Cache {
/**
* Create a new cache with a fixed size capacity
*
* @param capacity The fixed size capacity of the cache
*/
public LRUCache(final long capacity) {
this(capacity, -1, false, 0.0, 0.0);
}
/**
* 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.
*
* @param capacity The fixed size capacity of the cache
* @param numShardBits The cache is sharded to 2^numShardBits shards,
* by hash of the key
*/
public LRUCache(final long capacity, final int numShardBits) {
super(newLRUCache(capacity, numShardBits, false, 0.0, 0.0));
}
/**
* 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.
*
* @param capacity The fixed size capacity of the cache
* @param numShardBits The cache is sharded to 2^numShardBits shards,
* by hash of the key
* @param strictCapacityLimit insert to the cache will fail when cache is full
*/
public LRUCache(final long capacity, final int numShardBits,
final boolean strictCapacityLimit) {
super(newLRUCache(capacity, numShardBits, strictCapacityLimit, 0.0, 0.0));
}
/**
* 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.
*
* @param capacity The fixed size capacity of the cache
* @param numShardBits The cache is sharded to 2^numShardBits shards,
* by hash of the key
* @param strictCapacityLimit insert to the cache will fail when cache is full
* @param highPriPoolRatio percentage of the cache reserves for high priority
* entries
*/
public LRUCache(final long capacity, final int numShardBits, final boolean strictCapacityLimit,
final double highPriPoolRatio) {
super(newLRUCache(capacity, numShardBits, strictCapacityLimit, highPriPoolRatio, 0.0));
}
/**
* 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.
*
* @param capacity The fixed size capacity of the cache
* @param numShardBits The cache is sharded to 2^numShardBits shards,
* by hash of the key
* @param strictCapacityLimit insert to the cache will fail when cache is full
* @param highPriPoolRatio percentage of the cache reserves for high priority
* entries
* @param lowPriPoolRatio percentage of the cache reserves for low priority
* entries
*/
public LRUCache(final long capacity, final int numShardBits, final boolean strictCapacityLimit,
final double highPriPoolRatio, final double lowPriPoolRatio) {
super(newLRUCache(
capacity, numShardBits, strictCapacityLimit, highPriPoolRatio, lowPriPoolRatio));
}
private static native long newLRUCache(final long capacity, final int numShardBits,
final boolean strictCapacityLimit, final double highPriPoolRatio,
final double lowPriPoolRatio);
@Override
protected final void disposeInternal(final long handle) {
disposeInternalJni(handle);
}
private static native void disposeInternalJni(final long handle);
}
