org.apache.pulsar.common.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.pulsar.common.util;
import java.net.ServerSocket;
import java.util.HashSet;
import java.util.Set;
public class PortManager {
private static final Set PORTS = new HashSet<>();
/**
* Return a locked available port.
*
* @return locked available port.
*/
public static synchronized int nextLockedFreePort() {
int exceptionCount = 0;
while (true) {
try (ServerSocket ss = new ServerSocket(0)) {
int port = ss.getLocalPort();
if (!checkPortIfLocked(port)) {
PORTS.add(port);
return port;
}
} catch (Exception e) {
exceptionCount++;
if (exceptionCount > 100) {
throw new RuntimeException("Unable to allocate socket port", e);
}
}
}
}
/**
* Returns whether the port was released successfully.
*
* @return whether the release is successful.
*/
public static synchronized boolean releaseLockedPort(int lockedPort) {
return PORTS.remove(lockedPort);
}
/**
* Check port if locked.
*
* @return whether the port is locked.
*/
public static synchronized boolean checkPortIfLocked(int lockedPort) {
return PORTS.contains(lockedPort);
}
}