org.apache.pulsar.functions.api.examples.ContextFunction Maven / Gradle / Ivy
/*
* 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 java.util.stream.Collectors;
import org.apache.pulsar.functions.api.Context;
import org.apache.pulsar.functions.api.Function;
import org.slf4j.Logger;
public class ContextFunction implements Function {
@Override
public Void process(String input, Context context) {
Logger log = context.getLogger();
String inputTopics = context.getInputTopics().stream().collect(Collectors.joining(", "));
String functionName = context.getFunctionName();
String logMessage = String.format("A message with a value of \"%s\" has arrived on one of "
+ "the following topics: %s %n", input, inputTopics);
log.info(logMessage);
String metricName = String.format("function-%s-messages-received", functionName);
context.recordMetric(metricName, 1);
return null;
}
}