76 lines
2.4 KiB
Java
76 lines
2.4 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.messaging.datamodel;
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import com.android.messaging.Factory;
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import java.util.HashSet;
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/**
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* Utility abstraction which allows MemoryCaches in an application to register and then when there
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* is memory pressure provide a callback to reclaim the memory in the caches.
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*/
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public class MemoryCacheManager {
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private final HashSet<MemoryCache> mMemoryCaches = new HashSet<MemoryCache>();
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private final Object mMemoryCacheLock = new Object();
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public static MemoryCacheManager get() {
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return Factory.get().getMemoryCacheManager();
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}
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/**
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* Extend this interface to provide a reclaim method on a memory cache.
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*/
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public interface MemoryCache {
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void reclaim();
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}
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/**
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* Register the memory cache with the application.
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*/
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public void registerMemoryCache(final MemoryCache cache) {
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synchronized (mMemoryCacheLock) {
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mMemoryCaches.add(cache);
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}
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}
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/**
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* Unregister the memory cache with the application.
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*/
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public void unregisterMemoryCache(final MemoryCache cache) {
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synchronized (mMemoryCacheLock) {
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mMemoryCaches.remove(cache);
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}
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}
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/**
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* Reclaim memory in all the memory caches in the application.
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*/
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@SuppressWarnings("unchecked")
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public void reclaimMemory() {
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// We're creating a cache copy in the lock to ensure we're not working on a concurrently
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// modified set, then reclaim outside of the lock to minimize the time within the lock.
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final HashSet<MemoryCache> shallowCopy;
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synchronized (mMemoryCacheLock) {
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shallowCopy = (HashSet<MemoryCache>) mMemoryCaches.clone();
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}
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for (final MemoryCache cache : shallowCopy) {
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cache.reclaim();
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}
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}
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}
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