/**
* Copyright 2013 LiveRamp
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.liveramp.hank.util;
import com.liveramp.commons.collections.MemoryBoundLruHashMap;
import com.liveramp.commons.util.MemoryUsageEstimator;
public class SynchronizedMemoryBoundCache<K, V> {
private final com.liveramp.commons.collections.MemoryBoundLruHashMap<K, V> cache;
// A disabled cache will not add any synchronization overhead
public SynchronizedMemoryBoundCache(boolean isEnabled,
long numBytesCapacity,
int numItemsCapacity,
MemoryUsageEstimator<K> keyEstimator,
MemoryUsageEstimator<V> valueEstimator) {
if (isEnabled) {
cache = new MemoryBoundLruHashMap<K, V>(numItemsCapacity, numBytesCapacity, keyEstimator, valueEstimator);
} else {
cache = null;
}
}
public boolean isEnabled() {
return cache != null;
}
public V get(K key) {
if (!isEnabled()) {
return null;
} else {
synchronized (cache) {
return cache.get(key);
}
}
}
public void put(K key, V value) {
if (isEnabled()) {
if (value == null) {
throw new IllegalArgumentException("Value to put in cache should not be null.");
}
synchronized (cache) {
cache.putAndEvict(key, value);
}
}
}
public int size() {
if (!isEnabled()) {
return 0;
} else {
synchronized (cache) {
return cache.size();
}
}
}
public int getMaxNumItems() {
if(!isEnabled()){
return 0;
}else{
return cache.getMaxNumItems();
}
}
public long getNumManagedBytes() {
if (!isEnabled()) {
return 0;
} else {
synchronized (cache) {
return cache.getNumManagedBytes();
}
}
}
public long getMaxNumManagedBytes() {
if(!isEnabled()){
return 0;
}else{
return cache.getMaxNumManagedBytes();
}
}
}