/*
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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.camera.processing.memory;
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import com.android.camera.async.SafeCloseable;
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import javax.annotation.Nullable;
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/**
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* Pool for and/or creating or reusing expensive resources.
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*/
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public interface LruResourcePool<TKey, TValue> {
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/**
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* Returns a wrapped reference to a resource.
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*
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* @param key size of memory.
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* @return T object representing a reusable n-bytes of memory.
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*/
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public Resource<TValue> acquire(TKey key);
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/**
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* Closeable resource object that will release the underlying object back to the
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* source resource pool. A resource may be released or closed multiple times,
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* and calls to get will return null if the resource has already been released.
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*/
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public interface Resource<T> extends SafeCloseable {
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/**
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* Get the underlying resource. This will return null if the resource has been
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* closed and returned to the pool.
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*
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* @return the resource represented by this instance.
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*/
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@Nullable
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public T get();
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}
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}
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