[英]Java Executors Check TCP Connection Alive
I am trying to recognize that hosts are alive or dead with using executor in Java. 我试图通过在Java中使用executor来识别主机是活着还是死了。 In my case, I have severeal hosts which kept in a list.
在我的情况下,我有严格的主机保留在列表中。
My goal is to create threads with the number of hosts and checking them. 我的目标是创建具有多个主机并检查它们的线程。 When thread connect with the host, host doesnt close the connection, and sending a situation code such as 50 (dead) or 51(alive) continiously.
当线程与主机连接时,主机不会关闭连接,并且连续发送诸如50(死)或51(活动)的情况代码。
My problem is threads can only connect on host. 我的问题是线程只能在主机上连接。 For example;
例如;
I have two host 192.168.1.1 and 192.168.1.2. 我有两个主机192.168.1.1和192.168.1.2。 Threads should check both of them in the background but I can only connect in 1.1
线程应该在后台检查它们,但我只能在1.1中连接
List <Host> hosts = LoadBalancer.getHostList();
ExecutorService executor = Executors.newFixedThreadPool(hosts.size());
executor.submit(()->{
for (Host host:hosts) {
try {
connect(host,"message",1);
} catch (Exception e) {
e.printStackTrace();
}
}
});
Also I have syncronized setActive function inside of HOST.java 我还在HOST.java中同步了setActive函数
public class Host {
private String ip;
private int port;
private boolean isActive;
public Host(String ip, int port) {
this.ip = ip;
this.port = port;
this.isActive = true;
}
public synchronized boolean isActive() {
return isActive;
}
public synchronized void setActive(boolean active) {
isActive = active;
}
public String getIp() {
return ip;
}
public void setIp(String ip) {
this.ip = ip;
}
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
}
}
public static void connect(Host host, String message, int mode) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap clientBootstrap = new Bootstrap();
clientBootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 500);
clientBootstrap.group(group);
clientBootstrap.channel(NioSocketChannel.class);
clientBootstrap.remoteAddress(new InetSocketAddress(host.getIp(), host.getPort()));
clientBootstrap.handler(new ChannelInitializer<SocketChannel>() {
protected void initChannel(SocketChannel socketChannel) {
//TODO, TIMEOUT BILGISI ILE DOLDUR BURAYI
//socketChannel.pipeline().addLast(new ReadTimeoutHandler(1));
//socketChannel.pipeline().addLast("idleStateHandler", new IdleStateHandler(1, 1, 2));
socketChannel.pipeline().addLast(new ClientHandler(host, message, mode));
}
});
ChannelFuture channelFuture = clientBootstrap.connect().sync();
channelFuture.channel().closeFuture().sync();
} catch (Exception e) {
System.err.println("Connection timed out --> " + e);
host.setActive(false); //connection kurulamadı demektir. Bir sonraki mesaj geldiğinde bu hostun açılıp açılmadığı denenecek.
} finally {
group.shutdownGracefully().sync();
}
} }
This: 这个:
executor.submit(()->{
for (Host host:hosts) {
try {
connect(host,"message",1);
} catch (Exception e) {
e.printStackTrace();
}
}
});
results in all hosts being connected to in a single Thread. 导致所有主机连接到单个线程中。 You want it to read something like
你想要它读取类似的东西
for (Host host: hosts) {
executor.submit(()->{
try {
connect(host,"message",1);
} catch (Exception e) {
e.printStackTrace();
}
}
});
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