| /* |
| * 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.samza.tools; |
| |
| import java.io.IOException; |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| import org.apache.commons.lang3.NotImplementedException; |
| import org.apache.samza.Partition; |
| import org.apache.samza.config.Config; |
| import org.apache.samza.metrics.MetricsRegistry; |
| import org.apache.samza.system.OutgoingMessageEnvelope; |
| import org.apache.samza.system.SystemAdmin; |
| import org.apache.samza.system.SystemConsumer; |
| import org.apache.samza.system.SystemFactory; |
| import org.apache.samza.system.SystemProducer; |
| import org.apache.samza.system.SystemStreamMetadata; |
| import org.apache.samza.system.SystemStreamPartition; |
| import org.codehaus.jackson.map.ObjectMapper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * Console logging System factory that just writes the messages to the console output. |
| * This system factory is useful when the user wants to print the output of the stream processing to console. |
| */ |
| public class ConsoleLoggingSystemFactory implements SystemFactory { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ConsoleLoggingSystemFactory.class); |
| |
| public static AtomicInteger messageCounter = new AtomicInteger(); |
| private static ObjectMapper mapper = new ObjectMapper(); |
| |
| @Override |
| public SystemConsumer getConsumer(String systemName, Config config, MetricsRegistry registry) { |
| throw new NotImplementedException("Not Implemented"); |
| } |
| |
| @Override |
| public SystemProducer getProducer(String systemName, Config config, MetricsRegistry registry) { |
| return new LoggingSystemProducer(); |
| } |
| |
| @Override |
| public SystemAdmin getAdmin(String systemName, Config config) { |
| return new SimpleSystemAdmin(config); |
| } |
| |
| private class LoggingSystemProducer implements SystemProducer { |
| @Override |
| public void start() { |
| } |
| |
| @Override |
| public void stop() { |
| } |
| |
| @Override |
| public void register(String source) { |
| LOG.info("Registering source" + source); |
| } |
| |
| @Override |
| public void send(String source, OutgoingMessageEnvelope envelope) { |
| String msg = String.format("OutputStream:%s Key:%s Value:%s", envelope.getSystemStream(), envelope.getKey(), |
| envelope.getMessage() != null ? new String((byte[]) envelope.getMessage()) : null); |
| LOG.info(msg); |
| |
| System.out.println(String.format("Message %d :", messageCounter.incrementAndGet())); |
| if (envelope.getKey() != null) { |
| System.out.println(String.format("Key:%s Value:%s", envelope.getKey(), getFormattedValue(envelope))); |
| } else { |
| System.out.println(getFormattedValue(envelope)); |
| } |
| } |
| |
| private String getFormattedValue(OutgoingMessageEnvelope envelope) { |
| String value = envelope.getMessage() != null ? new String((byte[]) envelope.getMessage()) : null; |
| String formattedValue; |
| |
| try { |
| Object json = mapper.readValue(value, Object.class); |
| formattedValue = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(json); |
| } catch (IOException e) { |
| formattedValue = value; |
| LOG.error("Error while formatting json", e); |
| } |
| |
| return formattedValue; |
| } |
| |
| @Override |
| public void flush(String source) { |
| } |
| } |
| |
| public static class SimpleSystemAdmin implements SystemAdmin { |
| |
| public SimpleSystemAdmin(Config config) { |
| } |
| |
| @Override |
| public Map<SystemStreamPartition, String> getOffsetsAfter(Map<SystemStreamPartition, String> offsets) { |
| return offsets.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, null)); |
| } |
| |
| @Override |
| public Map<String, SystemStreamMetadata> getSystemStreamMetadata(Set<String> streamNames) { |
| return streamNames.stream() |
| .collect(Collectors.toMap(Function.identity(), streamName -> new SystemStreamMetadata(streamName, |
| Collections.singletonMap(new Partition(0), |
| new SystemStreamMetadata.SystemStreamPartitionMetadata(null, null, null))))); |
| } |
| |
| @Override |
| public Integer offsetComparator(String offset1, String offset2) { |
| if (offset1 == null) { |
| return offset2 == null ? 0 : -1; |
| } else if (offset2 == null) { |
| return 1; |
| } |
| return offset1.compareTo(offset2); |
| } |
| } |
| } |