1 // Protocol Buffers - Google's data interchange format 2 // Copyright 2008 Google Inc. All rights reserved. 3 // https://developers.google.com/protocol-buffers/ 4 // 5 // Redistribution and use in source and binary forms, with or without 6 // modification, are permitted provided that the following conditions are 7 // met: 8 // 9 // * Redistributions of source code must retain the above copyright 10 // notice, this list of conditions and the following disclaimer. 11 // * Redistributions in binary form must reproduce the above 12 // copyright notice, this list of conditions and the following disclaimer 13 // in the documentation and/or other materials provided with the 14 // distribution. 15 // * Neither the name of Google Inc. nor the names of its 16 // contributors may be used to endorse or promote products derived from 17 // this software without specific prior written permission. 18 // 19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 31 package com.google.protobuf; 32 33 import java.nio.ByteBuffer; 34 35 /** 36 * An object responsible for allocation of buffers. This is an extension point to enable buffer 37 * pooling within an application. 38 */ 39 @ExperimentalApi 40 abstract class BufferAllocator { 41 private static final BufferAllocator UNPOOLED = 42 new BufferAllocator() { 43 @Override 44 public AllocatedBuffer allocateHeapBuffer(int capacity) { 45 return AllocatedBuffer.wrap(new byte[capacity]); 46 } 47 48 @Override 49 public AllocatedBuffer allocateDirectBuffer(int capacity) { 50 return AllocatedBuffer.wrap(ByteBuffer.allocateDirect(capacity)); 51 } 52 }; 53 54 /** Returns an unpooled buffer allocator, which will create a new buffer for each request. */ unpooled()55 public static BufferAllocator unpooled() { 56 return UNPOOLED; 57 } 58 59 /** Allocates a buffer with the given capacity that is backed by an array on the heap. */ allocateHeapBuffer(int capacity)60 public abstract AllocatedBuffer allocateHeapBuffer(int capacity); 61 62 /** Allocates a direct (i.e. non-heap) buffer with the given capacity. */ allocateDirectBuffer(int capacity)63 public abstract AllocatedBuffer allocateDirectBuffer(int capacity); 64 } 65