The Tor Browser: mobile/android/base/util/NonEvictingLruCache.java@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko.util;

     8 import android.support.v4.util.LruCache;

    10 import java.util.concurrent.ConcurrentHashMap;

    12 /**

    13  * An LruCache that also supports a set of items that will never be evicted.

    14  *

    15  * Alas, LruCache is final, so we compose rather than inherit.

    16  */

    17 public class NonEvictingLruCache<K, V> {

    18     private final ConcurrentHashMap<K, V> permanent = new ConcurrentHashMap<K, V>();

    19     private final LruCache<K, V> evictable;

    21     public NonEvictingLruCache(final int evictableSize) {

    22         evictable = new LruCache<K, V>(evictableSize);

    23     }

    25     public V get(K key) {

    26         V val = permanent.get(key);

    27         if (val == null) {

    28             return evictable.get(key);

    29         }

    30         return val;

    31     }

    33     public void putWithoutEviction(K key, V value) {

    34         permanent.put(key, value);

    35     }

    37     public void put(K key, V value) {

    38         evictable.put(key, value);

    39     }

    41     public void evictAll() {

    42         evictable.evictAll();

    43     }

    44 }

The Tor Browser / file revision