org.apache.bookkeeper.util.PortManager Maven / Gradle / Ivy
/*
*
* 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 org.apache.bookkeeper.util;
import java.net.ServerSocket;
/**
* Port manager provides free ports to allows multiple instances
* of the bookkeeper tests to run at once.
*/
public class PortManager {
/**
* Return an available port.
*
* @return available port.
*/
public static synchronized int nextFreePort() {
int exceptionCount = 0;
while (true) {
try (ServerSocket ss = new ServerSocket(0)) {
return ss.getLocalPort();
} catch (Exception e) {
exceptionCount++;
if (exceptionCount > 100) {
throw new RuntimeException("Unable to allocate socket port", e);
}
}
}
}
}