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118 changes: 118 additions & 0 deletions
118
...rc/main/java/org/apache/hadoop/security/token/delegation/DelegationTokenLoadingCache.java
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| /** | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you 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. | ||
| */ | ||
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| package org.apache.hadoop.security.token.delegation; | ||
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| import java.util.Collection; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.function.Function; | ||
| import org.apache.hadoop.thirdparty.com.google.common.cache.CacheBuilder; | ||
| import org.apache.hadoop.thirdparty.com.google.common.cache.CacheLoader; | ||
| import org.apache.hadoop.thirdparty.com.google.common.cache.LoadingCache; | ||
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| /** | ||
| * Cache for delegation tokens that can handle high volume of tokens. A | ||
| * loading cache will prevent all active tokens from being in memory at the | ||
| * same time. It will also trigger more requests from the persistent token storage. | ||
| */ | ||
| public class DelegationTokenLoadingCache<K, V> implements Map<K, V> { | ||
| private LoadingCache<K, V> internalLoadingCache; | ||
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| public DelegationTokenLoadingCache(long cacheExpirationMs, long maximumCacheSize, | ||
| Function<K, V> singleEntryFunction) { | ||
| this.internalLoadingCache = CacheBuilder.newBuilder() | ||
| .expireAfterWrite(cacheExpirationMs, TimeUnit.MILLISECONDS) | ||
| .maximumSize(maximumCacheSize) | ||
| .build(new CacheLoader<K, V>() { | ||
| @Override | ||
| public V load(K k) throws Exception { | ||
| return singleEntryFunction.apply(k); | ||
| } | ||
| }); | ||
| } | ||
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| @Override | ||
| public int size() { | ||
| return (int) this.internalLoadingCache.size(); | ||
| } | ||
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| @Override | ||
| public boolean isEmpty() { | ||
| return size() == 0; | ||
| } | ||
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| @Override | ||
| public boolean containsKey(Object key) { | ||
| return this.internalLoadingCache.getIfPresent(key) != null; | ||
| } | ||
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| @Override | ||
| public boolean containsValue(Object value) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public V get(Object key) { | ||
| try { | ||
| return this.internalLoadingCache.get((K) key); | ||
| } catch (Exception e) { | ||
| return null; | ||
| } | ||
| } | ||
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| @Override | ||
| public V put(K key, V value) { | ||
| this.internalLoadingCache.put(key, value); | ||
| return this.internalLoadingCache.getIfPresent(key); | ||
| } | ||
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| @Override | ||
| public V remove(Object key) { | ||
| V value = this.internalLoadingCache.getIfPresent(key); | ||
| this.internalLoadingCache.invalidate(key); | ||
| return value; | ||
| } | ||
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| @Override | ||
| public void putAll(Map<? extends K, ? extends V> m) { | ||
| this.internalLoadingCache.putAll(m); | ||
| } | ||
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| @Override | ||
| public void clear() { | ||
| this.internalLoadingCache.invalidateAll(); | ||
| } | ||
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| @Override | ||
| public Set<K> keySet() { | ||
| return this.internalLoadingCache.asMap().keySet(); | ||
| } | ||
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| @Override | ||
| public Collection<V> values() { | ||
| return this.internalLoadingCache.asMap().values(); | ||
| } | ||
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| @Override | ||
| public Set<Entry<K, V>> entrySet() { | ||
| return this.internalLoadingCache.asMap().entrySet(); | ||
| } | ||
| } |
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