public static int KB = 1024;
public static int MB = 1024 * KB;
private static final int CAPACITY_SMALL = 4 * KB;
private static final int CAPACITY_MEDIUM = 128 * KB;
private static final int CAPACITY_LARGE = 1024 * KB;
//package scope (default) - so they can be accessed from unit tests.
byte[] smallMessageBuffer = new byte[1024 * 4 * KB]; //1024 x 4KB messages = 4MB.
byte[] mediumMessageBuffer = new byte[128 * 128 * KB]; // 128 x 128KB messages = 16MB.
byte[] largeMessageBuffer = new byte[16 * 1 * MB]; // 16 * 1MB messages = 16MB.
經?？匆娋彺娴拇笮《际且晕坏拇笮《x，是因為習慣，還是因為什么原因？在實際項目中是否有什么策略根據自己需求來定義最優的值來處理IO？
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