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82 lines
2.2 KiB
82 lines
2.2 KiB
/*
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* Copyright (C) 2018 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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#ifndef SHCIRCULARBUFFER_H
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#define SHCIRCULARBUFFER_H
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#include <log/log.h>
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#include <vector>
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template <class T>
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class SHCircularBuffer {
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public:
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SHCircularBuffer() : mReadIndex(0), mWriteIndex(0), mReadAvailable(0) {
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}
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explicit SHCircularBuffer(size_t maxSize) {
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resize(maxSize);
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}
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void resize(size_t maxSize) {
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mBuffer.resize(maxSize);
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mReadIndex = 0;
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mWriteIndex = 0;
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mReadAvailable = 0;
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}
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inline void write(T value) {
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if (availableToWrite()) {
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mBuffer[mWriteIndex++] = value;
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if (mWriteIndex >= getSize()) {
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mWriteIndex = 0;
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}
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mReadAvailable++;
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} else {
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ALOGE("Error: SHCircularBuffer no space to write. allocated size %zu ", getSize());
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}
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}
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inline T read() {
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T value = T();
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if (availableToRead()) {
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value = mBuffer[mReadIndex++];
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if (mReadIndex >= getSize()) {
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mReadIndex = 0;
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}
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mReadAvailable--;
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} else {
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ALOGW("Warning: SHCircularBuffer no data available to read. Default value returned");
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}
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return value;
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}
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inline size_t availableToRead() const {
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return mReadAvailable;
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}
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inline size_t availableToWrite() const {
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return getSize() - mReadAvailable;
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}
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inline size_t getSize() const {
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return mBuffer.size();
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}
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private:
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std::vector<T> mBuffer;
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size_t mReadIndex;
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size_t mWriteIndex;
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size_t mReadAvailable;
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};
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#endif //SHCIRCULARBUFFER_H
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