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@@ -0,0 +1,111 @@
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+/**
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+ * Licensed to the Apache Software Foundation (ASF) under one
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+ * or more contributor license agreements. See the NOTICE file
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+ * distributed with this work for additional information
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+ * regarding copyright ownership. The ASF licenses this file
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+ * to you under the Apache License, Version 2.0 (the
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+ * "License"); you may not use this file except in compliance
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+ * with the License. You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+package org.apache.hadoop.metrics2.sink.util;
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+
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+import java.net.InetAddress;
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+import java.net.InetSocketAddress;
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+import java.net.URI;
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+import java.net.UnknownHostException;
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+import java.util.ArrayList;
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+import java.util.List;
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+
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+import org.apache.hadoop.classification.InterfaceAudience;
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+import org.apache.hadoop.classification.InterfaceStability;
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+
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+/**
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+ * Helpers to handle server addresses
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+ */
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+@InterfaceAudience.Public
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+@InterfaceStability.Evolving
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+public class Servers {
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+ /**
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+ * This class is not intended to be instantiated
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+ */
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+ private Servers() {}
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+
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+ /**
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+ * Parses a space and/or comma separated sequence of server specifications
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+ * of the form <i>hostname</i> or <i>hostname:port</i>. If
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+ * the specs string is null, defaults to localhost:defaultPort.
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+ *
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+ * @param specs server specs (see description)
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+ * @param defaultPort the default port if not specified
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+ * @return a list of InetSocketAddress objects.
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+ */
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+ public static List<InetSocketAddress> parse(String specs, int defaultPort) {
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+ List<InetSocketAddress> result = new ArrayList<InetSocketAddress>();
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+ if (specs == null) {
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+ result.add(new InetSocketAddress("localhost", defaultPort));
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+ } else {
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+ String[] specStrings = specs.split("[ ,]+");
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+ for (String specString : specStrings) {
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+ result.add(createSocketAddr(specString, defaultPort));
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+ }
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+ }
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+ return result;
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+ }
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+
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+ /**
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+ * @param host
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+ * @param port
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+ * @return a InetSocketAddress created with the specified host and port
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+ */
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+ private static InetSocketAddress createSocketAddr(String target, int defaultPort) {
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+ String helpText = "";
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+ if (target == null) {
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+ throw new IllegalArgumentException("Target address cannot be null." + helpText);
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+ }
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+ boolean hasScheme = target.contains("://");
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+ URI uri = null;
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+ try {
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+ uri = hasScheme ? URI.create(target) : URI.create("dummyscheme://" + target);
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+ } catch (IllegalArgumentException e) {
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+ throw new IllegalArgumentException("Does not contain a valid host:port authority: " + target + helpText);
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+ }
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+
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+ String host = uri.getHost();
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+ int port = uri.getPort();
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+ if (port == -1) {
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+ port = defaultPort;
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+ }
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+ String path = uri.getPath();
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+
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+ if ((host == null) || (port < 0) || (!hasScheme && path != null && !path.isEmpty())) {
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+ throw new IllegalArgumentException("Does not contain a valid host:port authority: " + target + helpText);
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+ }
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+ return createSocketAddrForHost(host, port);
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+ }
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+
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+ /**
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+ * @param host
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+ * @param port
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+ * @return a InetSocketAddress created with the specified host and port
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+ */
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+ private static InetSocketAddress createSocketAddrForHost(String host, int port) {
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+ InetSocketAddress addr;
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+ try {
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+ InetAddress iaddr = InetAddress.getByName(host);
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+ iaddr = InetAddress.getByAddress(host, iaddr.getAddress());
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+ addr = new InetSocketAddress(iaddr, port);
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+ } catch (UnknownHostException e) {
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+ addr = InetSocketAddress.createUnresolved(host, port);
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+ }
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+ return addr;
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+ }
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+
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+}
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