/*
* 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.slider.core.zk;
import com.google.common.net.HostAndPort;
import org.apache.hadoop.util.StringUtils;
import org.apache.slider.common.tools.SliderUtils;
import org.apache.slider.core.exceptions.BadConfigException;
import java.util.ArrayList;
import java.util.List;
public class ZookeeperUtils {
public static String buildConnectionString(String zkHosts, int port) {
String zkPort = Integer.toString(port);
//parse the hosts
String[] hostlist = zkHosts.split(",", 0);
String quorum = SliderUtils.join(hostlist, ":" + zkPort + ",", false);
return quorum;
}
/**
* Take a quorum list and split it to (trimmed) pairs
* @param hostPortQuorumList list of form h1:port, h2:port2,...
* @return a possibly empty list of values between commas. They may not be
* valid hostname:port pairs
*/
public static List<String> splitToPairs(String hostPortQuorumList) {
// split an address hot
String[] strings = StringUtils.getStrings(hostPortQuorumList);
List<String> tuples = new ArrayList<>(strings.length);
for (String s : strings) {
tuples.add(s.trim());
}
return tuples;
}
/**
* Split a quorum list into a list of hostnames and ports
* @param hostPortQuorumList split to a list of hosts and ports
* @return a list of values
*/
public static List<HostAndPort> splitToHostsAndPorts(String hostPortQuorumList) {
// split an address hot
String[] strings = StringUtils.getStrings(hostPortQuorumList);
List<HostAndPort> list = new ArrayList<>(strings.length);
for (String s : strings) {
list.add(HostAndPort.fromString(s.trim()));
}
return list;
}
/**
* Build up to a hosts only list
* @param hostAndPorts
* @return a list of the hosts only
*/
public static String buildHostsOnlyList(List<HostAndPort> hostAndPorts) {
StringBuilder sb = new StringBuilder();
for (HostAndPort hostAndPort : hostAndPorts) {
sb.append(hostAndPort.getHostText()).append(",");
}
if (sb.length() > 0) {
sb.delete(sb.length() - 1, sb.length());
}
return sb.toString();
}
public static String buildQuorumEntry(HostAndPort hostAndPort,
int defaultPort) {
String s = hostAndPort.toString();
if (hostAndPort.hasPort()) {
return s;
} else {
return s + ":" + defaultPort;
}
}
/**
* Build a quorum list, injecting a ":defaultPort" ref if needed on
* any entry without one
* @param hostAndPorts
* @param defaultPort
* @return
*/
public static String buildQuorum(List<HostAndPort> hostAndPorts, int defaultPort) {
List<String> entries = new ArrayList<>(hostAndPorts.size());
for (HostAndPort hostAndPort : hostAndPorts) {
entries.add(buildQuorumEntry(hostAndPort, defaultPort));
}
return SliderUtils.join(entries, ",", false);
}
public static String convertToHostsOnlyList(String quorum) throws
BadConfigException {
List<HostAndPort> hostAndPorts = splitToHostsAndPortsStrictly(quorum);
return ZookeeperUtils.buildHostsOnlyList(hostAndPorts);
}
public static List<HostAndPort> splitToHostsAndPortsStrictly(String quorum) throws
BadConfigException {
List<HostAndPort> hostAndPorts =
ZookeeperUtils.splitToHostsAndPorts(quorum);
if (hostAndPorts.isEmpty()) {
throw new BadConfigException("empty zookeeper quorum");
}
return hostAndPorts;
}
public static int getFirstPort(String quorum, int defVal) throws
BadConfigException {
List<HostAndPort> hostAndPorts = splitToHostsAndPortsStrictly(quorum);
int port = hostAndPorts.get(0).getPortOrDefault(defVal);
return port;
}
}