Example usage for java.net ServerSocket ServerSocket

Introduction

In this page you can find the example usage for java.net ServerSocket ServerSocket.

Prototype

public ServerSocket(int port) throws IOException

Source Link

Document

Creates a server socket, bound to the specified port.

Usage

From source file:org.apache.flink.runtime.taskmanager.TaskManager.java

/**
 * Searches for an available free port and returns the port number.
 * /*w w w.j av a2s.  c o m*/
 * @return An available port.
 * @throws RuntimeException Thrown, if no free port was found.
 */
private static int getAvailablePort() {
    for (int i = 0; i < 50; i++) {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(0);
            int port = serverSocket.getLocalPort();
            if (port != 0) {
                return port;
            }
        } catch (IOException e) {

            LOG.debug("Unable to allocate port with exception {}", e);
        } finally {
            if (serverSocket != null) {
                try {
                    serverSocket.close();
                } catch (Throwable t) {
                }
            }
        }
    }

    throw new RuntimeException("Could not find a free permitted port on the machine.");
}

From source file:Tcpbw100.java

public boolean test_sfw(Protocol ctl) throws IOException {
    Message msg = new Message();
    if ((tests & TEST_SFW) == TEST_SFW) {
        showStatus(messages.getString("sfwTest"));
        results.append(messages.getString("checkingFirewalls") + "  ");
        statistics.append(messages.getString("checkingFirewalls") + "  ");
        emailText = messages.getString("checkingFirewalls") + "  ";
        pub_status = "checkingFirewalls";

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }/*from   www . j  av a  2s  . c o  m*/
        if (msg.type != TEST_PREPARE) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }

        String message = new String(msg.body);

        int srvPort, testTime;
        try {
            int k = message.indexOf(" ");
            srvPort = Integer.parseInt(message.substring(0, k));
            testTime = Integer.parseInt(message.substring(k + 1));
        } catch (Exception e) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            return true;
        }

        System.out.println("SFW: port=" + srvPort);
        System.out.println("SFW: testTime=" + testTime);

        ServerSocket srvSocket;
        try {
            SecurityManager security = System.getSecurityManager();
            if (security != null) {
                System.out.println("Asking security manager for listen permissions...");
                security.checkListen(0);
            }
            srvSocket = new ServerSocket(0);
        } catch (Exception e) {
            e.printStackTrace();
            errmsg = messages.getString("sfwSocketFail") + "\n";
            return true;
        }

        System.out.println("SFW: oport=" + srvSocket.getLocalPort());
        ctl.send_msg(TEST_MSG, Integer.toString(srvSocket.getLocalPort()).getBytes());

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }
        if (msg.type != TEST_START) {
            errmsg = messages.getString("sfwWrongMessage");
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }

        OsfwWorker osfwTest = new OsfwWorker(srvSocket, testTime);
        new Thread(osfwTest).start();

        Socket sfwSocket = new Socket();
        try {
            sfwSocket.connect(new InetSocketAddress(host, srvPort), testTime * 1000);

            Protocol sfwCtl = new Protocol(sfwSocket);
            sfwCtl.send_msg(TEST_MSG, new String("Simple firewall test").getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }
        if (msg.type != TEST_MSG) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }
        c2sResult = Integer.parseInt(new String(msg.body));

        osfwTest.finalize();

        if (ctl.recv_msg(msg) != 0) {
            errmsg = messages.getString("protocolError") + Integer.parseInt(new String(msg.body), 16)
                    + " instead\n";
            return true;
        }
        if (msg.type != TEST_FINALIZE) {
            errmsg = messages.getString("sfwWrongMessage") + "\n";
            if (msg.type == MSG_ERROR) {
                errmsg += "ERROR MSG: " + Integer.parseInt(new String(msg.body), 16) + "\n";
            }
            return true;
        }
        results.append(messages.getString("done") + "\n");
        statistics.append(messages.getString("done") + "\n");
        emailText += messages.getString("done") + "\n%0A";
    }
    return false;
}

From source file:com.chinamobile.bcbsp.workermanager.WorkerManager.java

@Override
public synchronized int getFreePort() {
    ServerSocket s;/*from  www.  j a  v  a 2  s .c  om*/
    this.currentFreePort = this.currentFreePort + 1;
    int count = 0;
    for (; this.currentFreePort <= 65536; this.currentFreePort++) {
        count++;
        if (count > 5535) {
            LOG.info("[WorkerManager: getFreePort()] attempts " + "to get a free port over 5535 times!");
            return 60000;
        }
        if (this.currentFreePort > 65535) {
            this.currentFreePort = 60001;
        }
        try {
            LOG.info("debug:this.currentFreePort is " + this.currentFreePort);
            s = new ServerSocket(this.currentFreePort);
            s.close();
            return this.currentFreePort;
        } catch (IOException e) {
            LOG.info("debug:this.currentFreePort is " + this.currentFreePort);
            LOG.error("[WokerManager] caught", e);
        }
    }
    return 60000;
}