use pipe to contact with each other

来源：互联网发布：led播放软件有几种编辑：程序博客网时间：2024/04/29 13:38

1.目的:(1)在通话建立时候,建立点对点的通话管道,(2)在A对B说话的时候,将对话压入B管道,反之同样,(3)在通话结束的时候切断管道

2.由于时间比较紧迫,限制最大管道数量200

3.代码如下

package PUB;
import java.io.*;
public class PipeManager
{

    private static PipedInputStream[] pipedIS ;
    private static PipedOutputStream[] pipedOS ;
    private static int[] inchat ;

    private static int maxpipe=20;

    private static String[] mysessions ;

    private static PipeManager instance = null;

        private PipeManager()
        {
            mysessions = new String[maxpipe];
            pipedIS = new PipedInputStream[maxpipe];
            pipedOS = new PipedOutputStream[maxpipe];
            inchat = new int[maxpipe];

            for(int i=0;i<maxpipe;i++)
            {
                mysessions[i]="";
                inchat[i]=0;
                pipedIS[i] = new PipedInputStream();
                pipedOS[i] = new PipedOutputStream();
                 try
                {
                    pipedIS[i].connect(pipedOS[i]);
                }
                catch (IOException e)
                {
                    System.err.println("连接失败");

                }
            }
            System.out.println("PipeManager init");
        }

    /** *//**
     * @return 单一实例
     */
    public static PipeManager getInstance(){
        if(instance==null) instance = new PipeManager();
        return instance;
    }

//找到管道名touser,内容mysessionid-msg
public synchronized boolean writemsg(String mysessionid,String touser,String msg)
{
    if(msg.length()==0) return false;

    // if(1==1) return true;
    int nget=-1;
    int nullget=-1;
    for(int i=0;i<maxpipe;i++)
    {
        if(mysessions[i]!=null&&mysessions[i].equals(mysessionid))
        {
            nget=i;
        }
        if(mysessions[i]==null||mysessions[i].length()==0)
        {
            nullget=i;
        }
        if(nget>=0&&nullget>=0) break;
    }
    if(nullget==-1)
    {
        //有问题
        return false;
    }
    if(nget==-1)
    {

            mysessions[nullget]=mysessionid;
            nget=nullget;


    }
    //写数据

                    try
                    {
                        String writestr=touser+"-"+msg;
                        byte[] b = writestr.getBytes("utf-8");
                        int len = b.length;
                        // 在该线程阻塞之前，有最多1024字节的数据被写入
                        pipedOS[nget].write( b, 0,len );
                        inchat[nget]++;
                    }
                    catch (IOException e)
                    {
                        System.err.println("写操作错误");
                        System.exit(1);
                    }
    return true;
}

//找到管道名mysessionid,读出内容fromuser-msg
   public synchronized String readmsg(String mysessionid)
{
    int nget=-1;
    int nullget=-1;
    for(int i=0;i<maxpipe;i++)
    {
        if(mysessions[i]!=null&&mysessions[i].equals(mysessionid))
        {
            nget=i;
        }
        if(mysessions[i]==null||mysessions[i].length()==0)
        {
            nullget=i;
        }
        if(nget>=0&&nullget>=0) break;
    }
    if(nget==-1) return "";
        if(    inchat[nget]>0) inchat[nget]--;
        else return "";
    //读取数据
        byte[] inArray = new byte[1000];
        int bytesRead = 0;
        try
        {
            int canread = pipedIS[nget].available();
            bytesRead = pipedIS[nget].read(inArray, 0, canread);

                System.out.println("已经读取" + bytesRead + "字节...");

            if(bytesRead>0)
            {
                return new String(inArray,"utf-8");
            }
        }
        catch (IOException e)
        {
            System.err.println("读取输入错误.");
            System.exit(1);
        }


    return "";
}

//删除管道,找到对应管道对,close,并=null
    public boolean removepipe(String mysessionid)
{
        int nget=-1;
    int nullget=-1;
    for(int i=0;i<maxpipe;i++)
    {
        if(mysessions[i]!=null&&mysessions[i].equals(mysessionid))
        {
            nget=i;
        }
        if(mysessions[i]==null||mysessions[i].length()==0)
        {
            nullget=i;
        }
        if(nget>=0&&nullget>=0) break;
    }
    if(nget==-1) return false;
      readmsg(mysessionid);
    mysessions[nget]="";



    return true;
}

    public int getinchat(String mysessionid)
    {
            int nget=-1;
            int nullget=-1;
            for(int i=0;i<maxpipe;i++)
            {
                if(mysessions[i]!=null&&mysessions[i].equals(mysessionid))
                {
                    nget=i;
                }
                if(mysessions[i]==null||mysessions[i].length()==0)
                {
                    nullget=i;
                }
                if(nget>=0&&nullget>=0) break;
            }

            if(nget==-1) return 0;

                if(    inchat[nget]>0) return inchat[nget];
                else return 0;
    }

}