92 lines
2.6 KiB
Java
92 lines
2.6 KiB
Java
/*
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* This file is part of the Wildfire Chat package.
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* (c) Heavyrain2012 <[email protected]>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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package win.liyufan.im;
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import java.util.Calendar;
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import java.util.Date;
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public class MessageShardingUtil {
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private static SpinLock mLock = new SpinLock();
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private static volatile int rotateId = 0;
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private static int nodeId = 0;
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private static int rotateIdWidth = 15;
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private static int rotateIdMask = 0x7FFF;
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private static int nodeIdWidth = 6;
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private static int nodeIdMask = 0x3F;
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private static final long T201801010000 = 1514736000000L;
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public static void setNodeId(int nodeId) {
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MessageShardingUtil.nodeId = nodeId;
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}
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/**
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* ID = timestamp(43) + nodeId(6) + rotateId(15)
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* 所以时间限制是到2157/5/15（2的42次幂代表的时间 + (2018-1970)）。节点数限制是小于64，每台服务器每毫秒最多发送32768条消息
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* @return
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*/
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public static long generateId() {
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mLock.lock();
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rotateId = (rotateId + 1)&rotateIdMask;
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mLock.unLock();
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long id = System.currentTimeMillis() - T201801010000;
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id <<= nodeIdWidth;
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id += (nodeId & nodeIdMask);
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id <<= rotateIdWidth;
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id += rotateId;
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return id;
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}
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public static String getMessageTable(long mid) {
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if (DBUtil.IsEmbedDB) {
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return "t_messages";
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}
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Calendar calendar = Calendar.getInstance();
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if (mid != Long.MAX_VALUE) {
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mid >>= (nodeIdWidth + rotateIdWidth);
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Date date = new Date(mid + T201801010000);
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calendar.setTime(date);
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} else {
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Date date = new Date(System.currentTimeMillis());
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calendar.setTime(date);
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}
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int month = calendar.get(Calendar.MONTH);
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int year = calendar.get(Calendar.YEAR);
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year %= 3;
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return "t_messages_" + (year * 12 + month);
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}
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public static String getPreviousMessageTable(long mid) {
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if (DBUtil.IsEmbedDB) {
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return null;
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}
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mid >>= (nodeIdWidth + rotateIdWidth);
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Date date = new Date(mid + T201801010000);
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Calendar calendar = Calendar.getInstance();
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calendar.setTime(date);
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int month = calendar.get(Calendar.MONTH);
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int year = calendar.get(Calendar.YEAR);
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year %= 3;
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month = month - 1;
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if (month == -1) {
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month = 11;
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year = (year + 3 - 1)%3;
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}
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return "t_messages_" + (year * 12 + month);
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}
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}
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