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java/org/apache/catalina/ha/backend/MultiCastSender.java

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+/*
+ * 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.catalina.ha.backend;
+
+import java.net.DatagramPacket;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.MulticastSocket;
+import java.nio.charset.StandardCharsets;
+
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+/*
+ * Sender to proxies using multicast socket.
+ */
+public class MultiCastSender
+    implements Sender {
+
+    private static final Log log = LogFactory.getLog(HeartbeatListener.class);
+
+    HeartbeatListener config = null;
+
+    /* for multicasting stuff */
+    MulticastSocket s = null;
+    InetAddress group = null;
+
+    @Override
+    public void init(HeartbeatListener config) throws Exception {
+        this.config = config;
+    }
+
+    @Override
+    public int send(String mess) throws Exception {
+        if (s == null) {
+            try {
+                group = InetAddress.getByName(config.getGroup());
+                if (config.getHost() != null) {
+                    InetAddress addr =  InetAddress.getByName(config.getHost());
+                    InetSocketAddress addrs = new InetSocketAddress(addr, config.getMultiport());
+                    s = new MulticastSocket(addrs);
+                } else
+                    s = new MulticastSocket(config.getMultiport());
+
+                s.setTimeToLive(config.getTtl());
+                s.joinGroup(group);
+            } catch (Exception ex) {
+                log.error("Unable to use multicast: " + ex);
+                s = null;
+                return -1;
+            }
+        }
+
+        byte[] buf;
+        buf = mess.getBytes(StandardCharsets.US_ASCII);
+        DatagramPacket data = new DatagramPacket(buf, buf.length, group, config.getMultiport());
+        try {
+            s.send(data);
+        } catch (Exception ex) {
+            log.error("Unable to send collected load information: " + ex);
+            s.close();
+            s = null;
+            return -1;
+        }
+        return 0;
+    }
+
+}