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服务器主逻辑代码的重构

2024-07-02 00:05:02   232人阅读

      不知道前主程是处于什么目的，总之我接手这套程序的时候，出现了超级多的问题，也发现了超级多的问题。

     比如说吧，接受网络消息逻辑是线程独立的，而发送消息给客户端缺阻塞在了逻辑线程里面；原本可以放在一个进程里面处理的逻辑，却分散在了四个进程里面去处理，导致我完成一个功能，大部分时间要话费了进程之间的玩家信息的同步上面，在我无法忍受的情况下，我终于是用NIO将网络底层从新写了，而且将四个进程合并，但是在很多逻辑上还是尽量保持了和原逻辑处理的兼容！

      先说说这个重构的底层吧！

     我们看下最重要的ClientHandle类，主要处理每个连接的收发数据的！

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public class ClientHandle implements ISession
{
    public final static int RW_BUFFER_SIZE = 1024;
    private SocketChannel socket = null;
     
    private java.nio.ByteBuffer reader = java.nio.ByteBuffer.allocate(RW_BUFFER_SIZE);
    private java.nio.ByteBuffer writer = java.nio.ByteBuffer.allocate(4*RW_BUFFER_SIZE);
     
    BlockingQueue<ByteBuffer> writeQueue = new LinkedBlockingQueue<ByteBuffer>();
     
    private IPlayer player = null;
     
    private boolean active = false;

　　 包含SocketChannel对象不用说了，reader和writer是用来做消息收发的缓冲的，因为服务器广播的压力会大一些，所以将writer的大小设置为reader的4倍，当然这个可以调整。

     writeQueue是用来存储需要发送给客户端的ByteBuffer，每次在这个链接可以写数据的时候，就将writeQueue里面存储的数据转移到writer中，并且一次发送，减少了writer的系统调用次数。ByteBuffer的结构简单说下，不同于java.nio.ByteBuffer，而是自己封装的一个消息解析器，给出源代码

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package NetBase;
 
/**
 * 类说明：字节缓存类，字节操作高位在前，低位在后
 *
 * @version 1.0
 * @author fxxxysh <hanshuang@linekong.com>
 */
 
public class ByteBuffer
{
 
    /* static fields */
    /** 默认的初始容量大小 */
    public static final int CAPACITY = 32;
 
    /** 默认的动态数据或文字的最大长度，400k */
    public static final int MAX_DATA_LENGTH = 400 * 1024;
 
    /* fields */
    /** 字节数组 */
    byte[] bytes;
 
    /** 字节缓存的长度 */
    int top;
 
    /** 字节缓存的偏移量 */
    int offset;
 
    /* constructors */
    /** 按默认的大小构造一个字节缓存对象 */
    public ByteBuffer()
    {
        this(CAPACITY);
    }
 
    /** 按指定的大小构造一个字节缓存对象 */
    public ByteBuffer(int capacity)
    {
        if (capacity < 1)
            throw new IllegalArgumentException(getClass().getName()
                    + " <init>, invalid capatity:" + capacity);
        bytes = new byte[capacity];
        top = 0;
        offset = 0;
    }
 
    /** 按指定的字节数组构造一个字节缓存对象 */
    public ByteBuffer(byte[] data)
    {
        if (data =http://www.mamicode.com/= null)
            throw new IllegalArgumentException(getClass().getName()
                    + " <init>, null data");
        bytes = data;
        top = data.length;
        offset = 0;
    }
 
    /** 按指定的字节数组构造一个字节缓存对象 */
    public ByteBuffer(byte[] data, int index, int length)
    {
        if (data =http://www.mamicode.com/= null)
            throw new IllegalArgumentException(getClass().getName()
                    + " <init>, null data");
        if (index < 0 || index > data.length)
            throw new IllegalArgumentException(getClass().getName()
                    + " <init>, invalid index:" + index);
        if (length < 0 || data.length < index + length)
            throw new IllegalArgumentException(getClass().getName()
                    + " <init>, invalid length:" + length);
        bytes = data;
        top = index + length;
        offset = index;
    }
 
    /* properties */
    /** 得到字节缓存的容积 */
    public int capacity()
    {
        return bytes.length;
    }
 
    /** 设置字节缓存的容积，只能扩大容积 */
    public void setCapacity(int len)
    {
        int c = bytes.length;
        if (len <= c)
            return;
        for (; c < len; c = (c << 1) + 1)
            ;
        byte[] temp = new byte[c];
        System.arraycopy(bytes, 0, temp, 0, top);
        bytes = temp;
    }
 
    /** 得到字节缓存的长度 */
    public int top()
    {
        return top;
    }
 
    /** 设置字节缓存的长度 */
    public void setTop(int top)
    {
        if (top < offset)
            throw new IllegalArgumentException(this + " setTop, invalid top:"
                    + top);
        if (top > bytes.length)
            setCapacity(top);
        this.top = top;
    }
 
    /** 得到字节缓存的偏移量 */
    public int offset()
    {
        return offset;
    }
 
    /** 设置字节缓存的偏移量 */
    public void setOffset(int offset)
    {
        if (offset < 0 || offset > top)
            throw new IllegalArgumentException(this
                    + " setOffset, invalid offset:" + offset);
        this.offset = offset;
    }
 
    /** 得到字节缓存的使用长度 */
    public int length()
    {
        return top - offset;
    }
 
    /** 得到字节缓存的字节数组，一般使用toArray()方法 */
    public byte[] getByteArray()
    {
        return bytes;
    }
 
    /* methods */
    /* byte methods */
    /** 得到指定偏移位置的字节 */
    public byte read(int pos)
    {
        return bytes[pos];
    }
 
    /** 设置指定偏移位置的字节 */
    public void write(int b, int pos)
    {
        bytes[pos] = (byte) b;
    }
 
    /* read methods */
    /**
     * 按当前偏移位置读入指定的字节数组
     *
     * @param data
     *            指定的字节数组
     * @param pos
     *            指定的字节数组的起始位置
     * @param len
     *            读入的长度
     */
    public void read(byte[] data, int pos, int len)
    {
        System.arraycopy(bytes, offset, data, pos, len);
        offset += len;
    }
 
    /** 读出一个布尔值 */
    public boolean readBoolean()
    {
        return (bytes[offset++] != 0);
    }
 
    /** 读出一个字节 */
    public byte readByte()
    {
        return bytes[offset++];
    }
 
    /** 读出一个无符号字节 */
    public int readUnsignedByte()
    {
        return bytes[offset++] & 0xff;
    }
 
    /** 读出一个字符 */
    public char readChar()
    {
        return (char) readUnsignedShort();
    }
 
    /** 读出一个短整型数值 */
    public short readShort()
    {
        return (short) readUnsignedShort();
    }
 
    /** 读出一个无符号的短整型数值 */
    public int readUnsignedShort()
    {
        int pos = offset;
        offset += 2;
        return (bytes[pos + 1] & 0xff) + ((bytes[pos] & 0xff) << 8);
    }
 
    /** 读出一个整型数值 */
    public int readInt()
    {
        int pos = offset;
        offset += 4;
        return (bytes[pos + 3] & 0xff) + ((bytes[pos + 2] & 0xff) << 8)
                + ((bytes[pos + 1] & 0xff) << 16) + ((bytes[pos] & 0xff) << 24);
    }
 
    /** 读出一个浮点数值 */
    public float readFloat()
    {
        return Float.intBitsToFloat(readInt());
    }
 
    /** 读出一个长整型数值 */
    public long readLong()
    {
        int pos = offset;
        offset += 8;
        return (bytes[pos + 7] & 0xffL) + ((bytes[pos + 6] & 0xffL) << 8)
                + ((bytes[pos + 5] & 0xffL) << 16)
                + ((bytes[pos + 4] & 0xffL) << 24)
                + ((bytes[pos + 3] & 0xffL) << 32)
                + ((bytes[pos + 2] & 0xffL) << 40)
                + ((bytes[pos + 1] & 0xffL) << 48)
                + ((bytes[pos] & 0xffL) << 56);
    }
 
    /** 读出一个双浮点数值 */
    public double readDouble()
    {
        return Double.longBitsToDouble(readLong());
    }
 
    /**
     * 读出动态长度， 数据大小采用动态长度，整数类型下，最大为512M 1xxx,xxxx表示（0~0x80） 0~128B
     * 01xx,xxxx,xxxx,xxxx表示（0~0x4000） 0~16K
     * 001x,xxxx,xxxx,xxxx,xxxx,xxxx,xxxx,xxxx表示（0~0x20000000） 0~512M
     */
    public int readLength()
    {
        int n = bytes[offset] & 0xff;
        if (n >= 0x80)
        {
            offset++;
            return n - 0x80;
        }
        else if (n >= 0x40)
            return readUnsignedShort() - 0x4000;
        else if (n >= 0x20)
            return readInt() - 0x20000000;
        else
            throw new IllegalArgumentException(this
                    + " readLength, invalid number:" + n);
    }
 
    /** 读出一个指定长度的字节数组，可以为null */
    public byte[] readData()
    {
        int len = readLength() - 1;
        if (len < 0)
            return null;
        if (len > MAX_DATA_LENGTH)
            throw new IllegalArgumentException(this
                    + " readData, data overflow:" + len);
        byte[] data = http://www.mamicode.com/new byte[len];
        read(data, 0, len);
        return data;
    }
 
    /** 读出一个短字节数组，长度不超过254 */
    public byte[] readShortData()
    {
        int len = readUnsignedByte();
        if (len == 255)
            return null;
        byte[] data = http://www.mamicode.com/new byte[len];
        if (len != 0)
            read(data, 0, len);
        return data;
    }
 
    /** 读出一个指定长度的字符串 */
    public String readString(int len)
    {
        byte[] data = http://www.mamicode.com/new byte[len];
        if (len == 0)
            return "";
        read(data, 0, len);
        return new String(data);
    }
 
    /** 读出一个短字符串，长度不超过254 */
    public String readShortString()
    {
        int len = readUnsignedByte();
        if (len == 255)
            return null;
        return readString(len);
    }
 
    /** 读出一个字符串，长度不超过65534 */
    public String readString()
    {
        int len = readUnsignedShort();
        if (len == 65535)
            return null;
        return readString(len);
    }
 
    /** 读出一个指定长度和编码类型的字符串 */
    public String readUTF(String charsetName)
    {
        int len = readLength() - 1;
        if (len < 0)
            return null;
        if (len > MAX_DATA_LENGTH)
            throw new IllegalArgumentException(this
                    + " readUTF, data overflow:" + len);
        byte[] data = http://www.mamicode.com/new byte[len];
        read(data, 0, len);
        if (charsetName == null)
            return new String(data);
        try
        {
            return new String(data, charsetName);
        }
        catch (Exception e)
        {
            throw new IllegalArgumentException(this
                    + " readUTF, invalid charsetName:" + charsetName);
        }
    }
 
    /** 读出一个指定长度的utf字符串 */
    public String readUTF()
    {
        int len = readLength() - 1;
        if (len < 0)
            return null;
        if (len == 0)
            return "";
        if (len > MAX_DATA_LENGTH)
            throw new IllegalArgumentException(this
                    + " readUTF, data overflow:" + len);
        StringBuffer sb = new StringBuffer(len);
        int pos = ByteKit.readUTF(bytes, offset, len, sb);
        if (pos > 0)
            throw new IllegalArgumentException(this
                    + " readUTF, format err, len=" + len + ", pos:" + pos);
        offset += len;
        return sb.toString();
    }
 
    /* write methods */
    /**
     * 写入指定字节数组
     *
     * @param data
     *            指定的字节数组
     * @param pos
     *            指定的字节数组的起始位置
     * @param len
     *            写入的长度
     */
    public void write(byte[] data, int pos, int len)
    {
        if (bytes.length < top + len)
            setCapacity(top + len);
        System.arraycopy(data, pos, bytes, top, len);
        top += len;
    }
 
    /** 写入一个布尔值 */
    public void writeBoolean(boolean b)
    {
        if (bytes.length < top + 1)
            setCapacity(top + CAPACITY);
        bytes[top++] = (byte) (b ? 1 : 0);
    }
 
    /** 写入一个字节 */
    public void writeByte(int b)
    {
        if (bytes.length < top + 1)
            setCapacity(top + CAPACITY);
        bytes[top++] = (byte) b;
    }
 
    /** 写入一个字符 */
    public void writeChar(int c)
    {
        writeShort(c);
    }
 
    /** 写入一个短整型数值 */
    public void writeShort(int s)
    {
        int pos = top;
        if (bytes.length < pos + 2)
            setCapacity(pos + CAPACITY);
        bytes[pos] = (byte) (s >>> 8);
        bytes[pos + 1] = (byte) s;
        top += 2;
    }
 
    /** 在指定位置写入一个短整型数值，length不变 */
    public void writeShort(int s, int pos)
    {
        if (bytes.length < pos + 2)
            setCapacity(pos + CAPACITY);
        bytes[pos] = (byte) (s >>> 8);
        bytes[pos + 1] = (byte) s;
    }
 
    /** 写入一个整型数值 */
    public void writeInt(int i)
    {
        int pos = top;
        if (bytes.length < pos + 4)
            setCapacity(pos + CAPACITY);
        bytes[pos] = (byte) (i >>> 24);
        bytes[pos + 1] = (byte) (i >>> 16);
        bytes[pos + 2] = (byte) (i >>> 8);
        bytes[pos + 3] = (byte) i;
        top += 4;
    }
 
    /** 在指定位置写入一个整型数值，length不变 */
    public void writeInt(int i, int pos)
    {
        if (bytes.length < pos + 4)
            setCapacity(pos + CAPACITY);
        bytes[pos] = (byte) (i >>> 24);
        bytes[pos + 1] = (byte) (i >>> 16);
        bytes[pos + 2] = (byte) (i >>> 8);
        bytes[pos + 3] = (byte) i;
    }
 
    /** 写入一个浮点数值 */
    public void writeFloat(float f)
    {
        writeInt(Float.floatToIntBits(f));
    }
 
    /** 写入一个长整型数值 */
    public void writeLong(long l)
    {
        int pos = top;
        if (bytes.length < pos + 8)
            setCapacity(pos + CAPACITY);
        bytes[pos] = (byte) (l >>> 56);
        bytes[pos + 1] = (byte) (l >>> 48);
        bytes[pos + 2] = (byte) (l >>> 40);
        bytes[pos + 3] = (byte) (l >>> 32);
        bytes[pos + 4] = (byte) (l >>> 24);
        bytes[pos + 5] = (byte) (l >>> 16);
        bytes[pos + 6] = (byte) (l >>> 8);
        bytes[pos + 7] = (byte) l;
        top += 8;
    }
 
    /** 写入一个双浮点数值 */
    public void writeDouble(double d)
    {
        writeLong(Double.doubleToLongBits(d));
    }
 
    /** 写入动态长度 */
    public void writeLength(int len)
    {
        if (len >= 0x20000000 || len < 0)
            throw new IllegalArgumentException(this
                    + " writeLength, invalid len:" + len);
        if (len >= 0x4000)
            writeInt(len + 0x20000000);
        else if (len >= 0x80)
            writeShort(len + 0x4000);
        else
            writeByte(len + 0x80);
    }
 
    /** 写入一个字节数组，可以为null */
    public void writeData(byte[] data)
    {
        writeData(data, 0, (data != null) ? data.length : 0);
    }
 
    /** 写入一个字节数组，可以为null */
    public void writeData(byte[] data, int pos, int len)
    {
        if (data =http://www.mamicode.com/= null)
        {
            writeLength(0);
            return;
        }
        writeLength(len + 1);
        write(data, pos, len);
    }
 
    /** 写入一个字符串，可以为null */
    public void writeString(String s)
    {
        if (s != null)
        {
            byte[] temp = s.getBytes();
            if (temp.length > 65534)
                throw new IllegalArgumentException(getClass().getName()
                        + " writeString, invalid s:" + s);
            writeShort(temp.length);
            if (temp.length != 0)
                write(temp, 0, temp.length);
        }
        else
            writeShort(65535);
    }
 
    /** 写入一个字符串，以指定的字符进行编码 */
    public void writeUTF(String str, String charsetName)
    {
        if (str == null)
        {
            writeLength(0);
            return;
        }
        byte[] data;
        if (charsetName != null)
        {
            try
            {
                data = http://www.mamicode.com/str.getBytes(charsetName);
            }
            catch (Exception e)
            {
                throw new IllegalArgumentException(this
                        + " writeUTF, invalid charsetName:" + charsetName);
            }
        }
        else
            data = http://www.mamicode.com/str.getBytes();
        writeLength(data.length + 1);
        write(data, 0, data.length);
    }
 
    /** 写入一个utf字符串，可以为null */
    public void writeUTF(String str)
    {
        writeUTF(str, 0, (str != null) ? str.length() : 0);
    }
 
    /** 写入一个utf字符串中指定的部分，可以为null */
    public void writeUTF(String str, int index, int length)
    {
        if (str == null)
        {
            writeLength(0);
            return;
        }
        int len = ByteKit.getUTFLength(str, index, length);
        writeLength(len + 1);
        int pos = top;
        if (bytes.length < pos + len)
            setCapacity(pos + len);
        ByteKit.writeUTF(str, index, length, bytes, pos);
        top += len;
    }
 
    /** 检查是否为相同类型的实例 */
    public boolean checkClass(Object obj)
    {
        return (obj instanceof ByteBuffer);
    }
 
    /** 在指定位置写入一个字节，length不变 */
    public void writeByte(int b, int pos)
    {
        if (bytes.length < pos + 1)
            setCapacity(pos + CAPACITY);
        bytes[pos] = (byte) b;
    }
 
    /** 得到字节缓存当前长度的字节数组 */
    public byte[] toByteArray()
    {
        byte[] data = http://www.mamicode.com/new byte[top - offset];
        System.arraycopy(bytes, offset, data, 0, data.length);
        return data;
    }
 
    /** 清除字节缓存对象 */
    public void clear()
    {
        top = 0;
        offset = 0;
    }
 
    /* common methods */
    public int hashCode()
    {
        int hash = 17;
        for (int i = top - 1; i >= 0; i--)
            hash = 65537 * hash + bytes[i];
        return hash;
    }
 
    public boolean equals(Object obj)
    {
        if (this == obj)
            return true;
        if (!checkClass(obj))
            return false;
        ByteBuffer bb = (ByteBuffer) obj;
        if (bb.top != top)
            return false;
        if (bb.offset != offset)
            return false;
        for (int i = top - 1; i >= 0; i--)
        {
            if (bb.bytes[i] != bytes[i])
                return false;
        }
        return true;
    }
 
    public String toString()
    {
        return super.toString() + "[" + top + "," + offset + "," + bytes.length
                + "] ";
    }
}

　　 下面看下 ClientHandle的可读逻辑：

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public int handleRead() throws IOException
    {
        int r = this.socket.read(this.reader);
        if(r <= 0)
        {
            return -1;
        }
        this.reader.flip();
         
        ByteBuffer data = http://www.mamicode.com/this.createBuffer();
        while(data != null)
        {
            this.reader.get(data.getByteArray(), data.top(), data.capacity());
            this.processData(data);
            data = http://www.mamicode.com/this.createBuffer();
        }
         
        this.reader.clear();
        return 0;
    }

　　依次将数据读入到reader中，并且按照LC(L表示长度，C表示内容)结构将reader中的数据解析成一个个ByteBuffer对象处理。下面是createBuffer函数和processData函数：

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private ByteBuffer createBuffer()
    {
        if(reader.remaining() < 4)
        {
            return null;
        }
         
        int len = reader.getInt();
        if(len > reader.remaining())
        {
            reader.clear();
            return null;
        }
         
        if (len > 0 && len <= 10 * 1024)
        {
            return new ByteBuffer(len);
        }
         
        return null;
    }
 
public void processData(ByteBuffer data)
{
       player.insertData(data);
}

　　 这里要注意，1：解析reader中的消息一定要做容错处理；2：将解析的待处理包放到玩家身上，让玩家自己处理！

     发送函数的处理：

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public int handleWrite() throws IOException
    {
        ByteBuffer data = http://www.mamicode.com/writeQueue.poll();
        while(data != null)
        {
            this.writer.putInt(data.length());
            this.writer.put(data.toByteArray(), 0, data.length());
            data = http://www.mamicode.com/writeQueue.poll();
        }
         
        this.writer.flip();
        if(!this.writer.hasRemaining())
        {
            this.writer.limit(this.writer.capacity());
            return 0;
        }
         
        this.socket.write(writer);
         
        if(this.writer.hasRemaining())
        {
            this.writer.compact();
            this.writer.position(this.writer.limit());
            this.writer.limit(this.writer.capacity());
        }
        else
        {
            this.writer.compact();
            this.writer.limit(this.writer.capacity());
        }
         
        return 0;
    }

　　发送函数的处理相对复杂些，首先要做的就是每个连接的发送函数每100ms(可以调整)触发一次，每次触发时候，要将待发送的数据包bytebuffer填充到writer缓冲区，然后一次发送！

     管理协调这些链接的新建和处理都是使用了java nio的selector结构，具体的代码就不贴出来了，想要的可以联系我，需要注意的有两点，1：对于空闲连接的处理，2：对于发送数据的处理

     大致讲完了网络线程，那么讲一讲主逻辑线程，逻辑线程采用线程绑定地图的设计；在服务器启动之时，启动n（可以调整）个地图线程，每个地图线程绑定N（可以调整）个地图，这N个地图上的所有玩家的逻辑处理，都有地图所在线程来处理，具体处理方式：

     地图线程的主逻辑：

+ View Code?
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public class SceneThread implements Runnable
{
     
    List<IScene> scenes = new ArrayList<IScene>();
    private int index = 0;
     
    @Override
    public void run()
    {
        while(true)
        {
            try
            {
                synchronized (scenes)
                {
                    for(IScene scene : this.scenes)
                    {
                        scene.beatHeart();
                    }  
                }
                Thread.sleep(100);
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    }
     
    public void addScene(IScene scene)
    {
        synchronized (scenes)
        {
            this.scenes.add(scene);
        }
    }
     
    public void removeScene(IScene scene)
    {
        synchronized (scenes)
        {
            this.scenes.remove(scene);
        }
    }
     
    public void setIndex(int index)
    {
        this.index = index;
    }
     
    public String toString()
    {
        return "SceneThread : " + index;
    }
     
}

　　场景Scene的心跳函数：

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public class Scene implements IScene
{
        public void beatHeart()
    {
        long now = System.currentTimeMillis();
        List<IPlayer> players = null;
        synchronized (idPlayerMap)
        {
            players = new ArrayList<IPlayer>(idPlayerMap.values());  
        }
         
        for(IPlayer player : players)
        {
            player.beatHeart(now);
        }
         
    }
         
}

　　玩家的心跳函数：

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BlockingQueue<ByteBuffer> dataToProcess = new LinkedBlockingDeque<ByteBuffer>();
     
    public void insertData(ByteBuffer data)
    {
        this.dataToProcess.offer(data);
    }
 
public void beatHeart(long now)
{
         
        ByteBuffer data = http://www.mamicode.com/this.dataToProcess.poll();
        while(data != null)
        {
            this.processData(data);
            data = http://www.mamicode.com/this.dataToProcess.poll();
        }
                //.....处理心跳定时器，上一篇有讲到
}

　　好了，大概的服务器的主逻辑就这些了，是不是精简小巧。晚上的时候还做了一下广播压力测试，效果还不错！

     欢迎大家提出宝贵意见！


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