@@ -0,0 +1,1412 @@
+/**%0A * Licensed to the Apache Software Foundation (ASF) under one%0A * or more contributor license agreements.  See the NOTICE file%0A * distributed with this work for additional information%0A * regarding copyright ownership.  The ASF licenses this file%0A * to you under the Apache License, Version 2.0 (the%0A * %22License%22); you may not use this file except in compliance%0A * with the License.  You may obtain a copy of the License at%0A *%0A *   http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing,%0A * software distributed under the License is distributed on an%0A * %22AS IS%22 BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY%0A * KIND, either express or implied.  See the License for the%0A * specific language governing permissions and limitations%0A * under the License.%0A */%0Apackage org.apache.pulsar.functions.api.examples;%0A%0Aimport org.apache.pulsar.functions.api.Context;%0Aimport org.apache.pulsar.functions.api.Function;%0A%0Aimport java.net.InetAddress;%0Aimport java.net.UnknownHostException;%0A%0A/**%0A * Function that appends the host name to the payload message%0A */%0Apublic class HostAppenderFunction implements Function%3CString, String%3E %7B%0A%0A    @Override%0A    public String process(String input, Context context) %7B%0A        try %7B%0A            return input + InetAddress.getLocalHost().getHostName();%0A        %7D catch (UnknownHostException e) %7B%0A            return null;%0A        %7D%0A    %7D%0A%7D%0A%0A

Add HostName appender function example (#2389)