| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed 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. |
| */ |
| package com.android.car.apps.common; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * @hide |
| */ |
| public final class ByteArrayPool { |
| |
| public static final int CHUNK16K = 16 * 1024; |
| public static final int DEFAULT_MAX_NUM = 8; |
| |
| private final static ByteArrayPool sChunk16K = new ByteArrayPool(CHUNK16K, DEFAULT_MAX_NUM); |
| |
| private final ArrayList<byte[]> mCachedBuf; |
| private final int mChunkSize; |
| private final int mMaxNum; |
| |
| private ByteArrayPool(int chunkSize, int maxNum) { |
| mChunkSize = chunkSize; |
| mMaxNum = maxNum; |
| mCachedBuf = new ArrayList<byte[]>(mMaxNum); |
| } |
| |
| /** |
| * get singleton of 16KB byte[] pool |
| */ |
| public static ByteArrayPool get16KBPool() { |
| return sChunk16K; |
| } |
| |
| public byte[] allocateChunk() { |
| synchronized (mCachedBuf) { |
| int size = mCachedBuf.size(); |
| if (size > 0) { |
| return mCachedBuf.remove(size - 1); |
| } |
| return new byte[mChunkSize]; |
| } |
| } |
| |
| public void clear() { |
| synchronized (mCachedBuf) { |
| mCachedBuf.clear(); |
| } |
| } |
| |
| public void releaseChunk(byte[] buf) { |
| if (buf == null || buf.length != mChunkSize) { |
| return; |
| } |
| synchronized (mCachedBuf) { |
| if (mCachedBuf.size() < mMaxNum) { |
| mCachedBuf.add(buf); |
| } |
| } |
| } |
| |
| public void releaseChunks(List<byte[]> bufs) { |
| synchronized (mCachedBuf) { |
| for (int i = 0, c = bufs.size(); i < c; i++) { |
| if (mCachedBuf.size() == mMaxNum) { |
| break; |
| } |
| byte[] buf = bufs.get(i); |
| if (buf != null && buf.length == mChunkSize) { |
| mCachedBuf.add(bufs.get(i)); |
| } |
| } |
| } |
| } |
| |
| } |