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-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/network/NetworkUtil.java113
1 files changed, 113 insertions, 0 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/network/NetworkUtil.java b/utils/src/main/java/org/onap/policy/common/utils/network/NetworkUtil.java
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+++ b/utils/src/main/java/org/onap/policy/common/utils/network/NetworkUtil.java
@@ -0,0 +1,113 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.network;
+
+import java.io.IOException;
+import java.net.ConnectException;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.UnknownHostException;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Network Utilities
+ */
+public class NetworkUtil {
+
+ public static final Logger logger = LoggerFactory.getLogger(NetworkUtil.class.getName());
+
+ /**
+ * IPv4 Wildcard IP address
+ */
+ public static final String IPv4_WILDCARD_ADDRESS = "0.0.0.0";
+
+ private NetworkUtil() {
+ // Empty constructor
+ }
+
+ /**
+ * try to connect to $host:$port $retries times while we are getting connection failures.
+ *
+ * @param host host
+ * @param port port
+ * @param retries number of attempts
+ * @return true is port is open, false otherwise
+ * @throws InterruptedException if execution has been interrupted
+ */
+ public static boolean isTcpPortOpen(String host, int port, int retries, long interval)
+ throws InterruptedException, IOException {
+ int retry = 0;
+ while (retry < retries) {
+ try (Socket s = new Socket(host, port)) {
+ logger.debug("{}:{} connected - retries={} interval={}", host, port, retries, interval);
+ return true;
+ } catch (final ConnectException e) {
+ retry++;
+ logger.trace("{}:{} connected - retries={} interval={}", host, port, retries, interval, e);
+ Thread.sleep(interval);
+ }
+ }
+
+ logger.warn("{}:{} closed = retries={} interval={}", host, port, retries, interval);
+ return false;
+ }
+
+ /**
+ * gets host name
+ *
+ * @return host name
+ */
+ public static String getHostname() {
+
+ String hostname = System.getenv("HOSTNAME");
+ if (hostname != null && !hostname.isEmpty()) {
+ return hostname;
+ }
+
+ try {
+ return InetAddress.getLocalHost().getHostName();
+ } catch (UnknownHostException e) {
+ logger.warn("cannot resolve local hostname", e);
+ /* continue */
+ }
+
+ return "localhost";
+ }
+
+ /**
+ * gets host's IP
+ *
+ * @return host IP
+ */
+ public static String getHostIp() {
+
+ try {
+ return InetAddress.getLocalHost().getHostAddress();
+ } catch (UnknownHostException e) {
+ logger.warn("cannot resolve local hostname", e);
+ /* continue */
+ }
+
+ return "127.0.0.1";
+ }
+}