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new 544d90a Add HostName appender function example (#2389)
544d90a is described below
commit 544d90a637060cd9a20e8c785b52d1431644fee9
Author: Ali Ahmed <[email protected]>
AuthorDate: Fri Aug 17 08:46:32 2018 -0700
Add HostName appender function example (#2389)
---
.../api/examples/HostAppenderFunction.java | 41 ++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git
a/pulsar-functions/java-examples/src/main/java/org/apache/pulsar/functions/api/examples/HostAppenderFunction.java
b/pulsar-functions/java-examples/src/main/java/org/apache/pulsar/functions/api/examples/HostAppenderFunction.java
new file mode 100644
index 0000000..2358e91
--- /dev/null
+++
b/pulsar-functions/java-examples/src/main/java/org/apache/pulsar/functions/api/examples/HostAppenderFunction.java
@@ -0,0 +1,41 @@
+/**
+ * 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.pulsar.functions.api.examples;
+
+import org.apache.pulsar.functions.api.Context;
+import org.apache.pulsar.functions.api.Function;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+/**
+ * Function that appends the host name to the payload message
+ */
+public class HostAppenderFunction implements Function<String, String> {
+
+ @Override
+ public String process(String input, Context context) {
+ try {
+ return input + InetAddress.getLocalHost().getHostName();
+ } catch (UnknownHostException e) {
+ return null;
+ }
+ }
+}
+
