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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package tests.support;
import java.net.DatagramSocket;
import java.net.ServerSocket;
import java.util.Calendar;
import java.util.TimeZone;
/**
* The port manager is supposed to help finding a free
* network port on the machine; however, it uses strange
* logic, so leave it to the OS.
*
* @deprecated Use the OS to find free ports.
*/
public class Support_PortManager {
private static int lastAssignedPort = somewhatRandomPort();
private static boolean failedOnce = false;
public static synchronized int getNextPort() {
if (!failedOnce) {
try {
ServerSocket ss = new ServerSocket(0);
int port = ss.getLocalPort();
ss.close();
return port;
} catch (Exception ex) {
failedOnce = true;
}
}
return getNextPort_unsafe();
}
/**
* Returns 1 free ports to be used.
*/
public static synchronized int getNextPortForUDP() {
return getNextPortsForUDP(1)[0];
}
/**
* Returns the specified number of free ports to be used.
*/
public static synchronized int[] getNextPortsForUDP(int num) {
if (num <= 0) {
throw new IllegalArgumentException("Invalid ports number: " + num);
}
DatagramSocket[] dss = new DatagramSocket[num];
int[] ports = new int[num];
try {
for (int i = 0; i < num; ++i) {
dss[i] = new DatagramSocket(0);
ports[i] = dss[i].getLocalPort();
}
} catch (Exception ex) {
throw new Error("Unable to get " + num + " ports for UDP: " + ex);
} finally {
for (int i = 0; i < num; ++i) {
if (dss[i] != null) {
dss[i].close();
}
}
}
return ports;
}
public static synchronized int getNextPort_unsafe() {
if (++lastAssignedPort > 65534) {
lastAssignedPort = 6000;
}
return lastAssignedPort;
}
/*
* Returns a different port number every 6 seconds or so. The port number
* should be about += 100 at each 6 second interval
*/
private static int somewhatRandomPort() {
Calendar c = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
int minutes = c.get(Calendar.MINUTE);
int seconds = c.get(Calendar.SECOND);
return 6000 + (1000 * minutes) + ((seconds / 6) * 100);
}
}
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