[英]Blocking a java socket that is opening/in use
Good Day, 美好的一天,
I have a sendMessage function in java that looks like this. 我在java中有一个sendMessage函数,看起来像这样。 It exists currently as a static method that can be called by any thread operation (such as a HTTP request). 它当前作为静态方法存在,可以由任何线程操作(例如HTTP请求)调用。 However, if I was to send two requests at the same time..one of the sendMessage requests will throw a "Connection reset". 但是,如果我要同时发送两个请求,则其中一个sendMessage请求将引发“连接重置”。
I need someway to know that my current port and ip is in use! 我需要知道我当前的端口和IP正在使用中! So that I do not reset the connection, and instead, wait for it to become available again. 这样我就不会重置连接,而是等待它再次可用。 Is there a way? 有办法吗?
private static String sendMessage(int command,String data,int port,String ip){
try{
String sendString=Integer.toString(command)+":"+data+'$'+'\n';
BufferedReader inFromUser = new BufferedReader( new InputStreamReader(System.in));
Socket clientSocket = new Socket();
InetAddress addr = InetAddress.getByName(ip);
SocketAddress sockaddr = new InetSocketAddress(addr, port);
clientSocket.connect(sockaddr, 20000);
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
outToServer.writeBytes(sendString);
String rcvString = inFromServer.readLine();
System.out.println("FROM DEVICE: " + rcvString);
clientSocket.close();
return rcvString;
}catch(Exception e){
System.err.println(e.getMessage());
}
return NULL;
}
Okay I just thought of an ingenious solution but it's ugly. 好吧,我只是想到了一个巧妙的解决方案,但这很丑陋。
Have a blockChecker class 有一个blockChecker类
public class BlockerCheck {
List<String> blockerList;
public BlockerCheck(){
blockerList=new ArrayList<String>();
}
public synchronized void addBlock(String ip,int port){
String finalString=ip+":"+Integer.toString(port);
blockerList.add(finalString);
}
public synchronized void removeBlock(String ip,int port){
String finalString=ip+":"+Integer.toString(port);
blockerList.remove(finalString);
}
public synchronized boolean isAvailable(String ip,int port){
String finalString=ip+":"+Integer.toString(port);
System.out.println("SIZE:" +blockerList.size());
return !(blockerList.contains(finalString));
}
}
Then use it as such: 然后按如下方式使用它:
private static String sendMessage(int command,String data,int port,String ip){
if(blockerCheck.isAvailable(ip, port)) blockerCheck.addBlock(ip, port);
else{
long startTime=TimeUnit.SECONDS.convert(System.nanoTime(), TimeUnit.NANOSECONDS);
while(!(blockerCheck.isAvailable(ip, port))){
long currTime=TimeUnit.SECONDS.convert(System.nanoTime(), TimeUnit.NANOSECONDS);
if((currTime-startTime)>10) return null; //ensure null handled
}
}
//SENDING CODE HERE
blockerCheck.removeBlock(ip, port);
}
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