com.jkoolcloud.tnt4j.streams.inputs.KafkaConsumerStream Maven / Gradle / Ivy
/*
* Copyright 2014-2018 JKOOL, LLC.
*
* Licensed 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 com.jkoolcloud.tnt4j.streams.inputs;
import java.io.IOException;
import java.time.Duration;
import java.util.*;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.WakeupException;
import com.jkoolcloud.tnt4j.core.OpLevel;
import com.jkoolcloud.tnt4j.sink.EventSink;
import com.jkoolcloud.tnt4j.streams.configure.KafkaStreamProperties;
import com.jkoolcloud.tnt4j.streams.configure.StreamProperties;
import com.jkoolcloud.tnt4j.streams.utils.*;
/**
* Implements a Kafka topics transmitted activity stream, where each message body is assumed to represent a single
* activity or event which should be recorded. Topic to listen is defined using "Topic" property in stream
* configuration.
*
* This activity stream requires parsers that can support {@link ConsumerRecord} data like
* {@link com.jkoolcloud.tnt4j.streams.parsers.KafkaConsumerRecordParser}.
*
* This activity stream supports the following configuration properties (in addition to those supported by
* {@link AbstractBufferedStream}):
*
* - Topic - defines set of topic names (delimited using '|' character) to listen. (Required)
* - Offset - defines list of topic offsets (delimited using '|' character) to start consuming messages. Single value
* applies to all topics. Default value - {@code -1 (from latest)}. (Optional)
* - FileName - Kafka Consumer configuration file ({@code "consumer.properties"}) path. (Optional)
* - List of Kafka Consumer configuration properties. See
* Kafka Consumer configuration reference.
*
*
* NOTE: those file defined Kafka consumer properties gets merged with ones defined in stream configuration - user
* defined properties. So you can take some basic consumer configuration form file and customize it using stream
* configuration defined properties.
*
* @version $Revision: 1 $
*
* @see com.jkoolcloud.tnt4j.streams.parsers.ActivityParser#isDataClassSupported(Object)
* @see com.jkoolcloud.tnt4j.streams.parsers.KafkaConsumerRecordParser
*/
public class KafkaConsumerStream extends AbstractBufferedStream> {
private static final EventSink LOGGER = LoggerUtils.getLoggerSink(KafkaConsumerStream.class);
/**
* Kafka consumer user (over stream configuration) defined configuration scope mapping key.
*/
protected static final String PROP_SCOPE_USER = "user"; // NON-NLS
/**
* Kafka consumer properties file defined configuration scope mapping key.
*/
protected static final String PROP_SCOPE_CONSUMER = "consumer"; // NON-NLS
private String topicName;
private Set topicNames;
private String offset;
private List offsets;
private String cfgFileName;
private Map userKafkaProps = new HashMap<>(3);
private KafkaDataReceiver kafkaDataReceiver;
/**
* Constructs a new KafkaConsumerStream.
*/
public KafkaConsumerStream() {
super();
}
@Override
protected EventSink logger() {
return LOGGER;
}
@Override
public void setProperty(String name, String value) {
super.setProperty(name, value);
if (StreamProperties.PROP_TOPIC_NAME.equalsIgnoreCase(name)) {
topicName = value;
if (StringUtils.isNotEmpty(value)) {
String[] topics = Utils.splitValue(topicName);
topicNames = new LinkedHashSet<>(topics.length);
for (String topic : topicNames) {
String tTopic = topic.trim();
if (!tTopic.isEmpty()) {
topicNames.add(tTopic);
}
}
}
} else if (StreamProperties.PROP_FILENAME.equalsIgnoreCase(name)) {
cfgFileName = value;
} else if (KafkaStreamProperties.PROP_OFFSET.equalsIgnoreCase(name)) {
offset = value;
if (StringUtils.isNotEmpty(value)) {
String[] offsetArray = Utils.splitValue(offset);
offsets = new ArrayList<>(offsetArray.length);
for (String offst : offsetArray) {
String tOffst = offst.trim();
offsets.add(tOffst.isEmpty() ? -1 : Integer.parseInt(tOffst));
}
}
} else if (!StreamsConstants.isStreamCfgProperty(name, KafkaStreamProperties.class)) {
addUserKafkaProperty(name, decPassword(value));
}
}
@Override
public Object getProperty(String name) {
if (StreamProperties.PROP_TOPIC_NAME.equalsIgnoreCase(name)) {
return topicName;
}
if (KafkaStreamProperties.PROP_OFFSET.equalsIgnoreCase(name)) {
return offset;
}
if (StreamProperties.PROP_FILENAME.equalsIgnoreCase(name)) {
return cfgFileName;
}
Object prop = super.getProperty(name);
if (prop == null) {
prop = getUserKafkaProperty(name);
}
return prop;
}
/**
* Adds Kafka configuration property to user defined (from stream configuration) properties map.
*
* @param pName
* fully qualified property name
* @param pValue
* property value
* @return the previous value of the specified property in user's Kafka configuration property list, or {@code null}
* if it did not have one
*/
protected Object addUserKafkaProperty(String pName, String pValue) {
if (StringUtils.isEmpty(pName)) {
return null;
}
String[] pParts = tokenizePropertyName(pName);
Properties sProps = userKafkaProps.get(pParts[0]);
if (sProps == null) {
sProps = new Properties();
userKafkaProps.put(pParts[0], sProps);
}
return sProps.setProperty(pParts[1], pValue);
}
/**
* Gets user defined (from stream configuration) Kafka consumer configuration property value.
*
* @param pName
* fully qualified property name
* @return property value, or {@code null} if property is not set
*/
protected String getUserKafkaProperty(String pName) {
if (StringUtils.isEmpty(pName)) {
return null;
}
// String[] pParts = tokenizePropertyName(pName);
Properties sProperties = userKafkaProps.get(PROP_SCOPE_USER);
return sProperties == null ? null : sProperties.getProperty(pName);
}
/**
* Splits fully qualified property name to property scope and name.
*
* @param pName
* fully qualified property name
* @return string array containing property scope and name
*/
protected static String[] tokenizePropertyName(String pName) {
if (StringUtils.isEmpty(pName)) {
return null;
}
int sIdx = pName.indexOf(':');
String[] pParts = new String[2];
if (sIdx >= 0) {
pParts[0] = pName.substring(0, sIdx);
pParts[1] = pName.substring(sIdx + 1);
} else {
pParts[1] = pName;
}
if (StringUtils.isEmpty(pParts[0])) {
pParts[0] = PROP_SCOPE_USER;
}
return pParts;
}
/**
* Returns scope defined properties set.
*
* @param scope
* properties scope key
* @return scope defined properties
*/
protected Properties getScopeProps(String scope) {
Properties allScopeProperties = new Properties();
Properties sProperties = userKafkaProps.get(scope);
if (sProperties != null) {
allScopeProperties.putAll(sProperties);
}
if (!PROP_SCOPE_USER.equals(scope)) {
sProperties = userKafkaProps.get(PROP_SCOPE_USER);
if (sProperties != null) {
allScopeProperties.putAll(sProperties);
}
}
return allScopeProperties;
}
@Override
protected void applyProperties() throws Exception {
super.applyProperties();
if (CollectionUtils.isEmpty(topicNames)) {
throw new IllegalStateException(StreamsResources.getStringFormatted(StreamsResources.RESOURCE_BUNDLE_NAME,
"TNTInputStream.property.undefined", StreamProperties.PROP_TOPIC_NAME));
}
if (CollectionUtils.isNotEmpty(offsets) && offsets.size() > 1 && offsets.size() != topicNames.size()) {
throw new IllegalStateException(StreamsResources.getStringFormatted(StreamsResources.RESOURCE_BUNDLE_NAME,
"KafkaConsumerStream.offsets.mismatch", offsets.size(), topicNames.size()));
}
if (StringUtils.isNotEmpty(cfgFileName)) {
logger().log(OpLevel.DEBUG, StreamsResources.getBundle(KafkaStreamConstants.RESOURCE_BUNDLE_NAME),
"KafkaConsumerStream.consumer.cfgFile.load", cfgFileName);
try {
Properties fCfgProps = Utils.loadPropertiesFile(cfgFileName);
userKafkaProps.put(PROP_SCOPE_CONSUMER, fCfgProps);
} catch (IOException exc) {
Utils.logThrowable(logger(), OpLevel.WARNING,
StreamsResources.getBundle(KafkaStreamConstants.RESOURCE_BUNDLE_NAME),
"KafkaConsumerStream.consumer.cfgFile.load.failed", exc);
}
}
}
@Override
protected void initialize() throws Exception {
super.initialize();
logger().log(OpLevel.DEBUG, StreamsResources.getBundle(KafkaStreamConstants.RESOURCE_BUNDLE_NAME),
"KafkaConsumerStream.consumer.starting");
kafkaDataReceiver = new KafkaDataReceiver();
kafkaDataReceiver.initialize(getScopeProps(PROP_SCOPE_CONSUMER), topicNames, offsets);
}
@Override
protected void start() throws Exception {
super.start();
kafkaDataReceiver.start();
logger().log(OpLevel.DEBUG, StreamsResources.getBundle(StreamsResources.RESOURCE_BUNDLE_NAME),
"TNTInputStream.stream.start", getClass().getSimpleName(), getName());
}
@Override
protected long getActivityItemByteSize(ConsumerRecord activityItem) {
return Math.max(activityItem.serializedKeySize(), 0) + Math.max(activityItem.serializedValueSize(), 0);
}
@Override
public boolean isInputEnded() {
return kafkaDataReceiver.isInputEnded();
}
@Override
protected void cleanup() {
if (kafkaDataReceiver != null) {
kafkaDataReceiver.shutdown();
}
userKafkaProps.clear();
super.cleanup();
}
private class KafkaDataReceiver extends InputProcessor {
private Consumer consumer;
private Set topics;
private List offsets;
private boolean autoCommit = true;
private KafkaDataReceiver() {
super("KafkaConsumerStream.KafkaDataReceiver"); // NON-NLS
}
/**
* Input data receiver initialization - Kafka consumer configuration.
*
* @param params
* initialization parameters array
*
* @throws Exception
* if fails to initialize data receiver and configure Kafka consumer
*/
@Override
@SuppressWarnings("unchecked")
protected void initialize(Object... params) throws Exception {
Properties cProperties = (Properties) params[0];
topics = (Set) params[1];
offsets = (List) params[2];
autoCommit = Utils.getBoolean(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, cProperties, true);
consumer = new KafkaConsumer<>(cProperties);
}
/**
* Starts Kafka consumer client to receive incoming data. Shuts down this data receiver if exception occurs.
*/
@Override
public void run() {
if (consumer != null) {
try {
consumer.subscribe(topics);
if (CollectionUtils.isNotEmpty(offsets)) {
if (offsets.size() == 1) {
if (offsets.get(0) >= 0) {
for (String topic : topics) {
consumer.seek(new TopicPartition(topic, 0), offsets.get(0));
}
}
} else {
int idx = 0;
for (String topic : topics) {
int offset = offsets.get(idx++);
if (offset >= 0) {
consumer.seek(new TopicPartition(topic, 0), offset);
}
}
}
}
while (!isHalted()) {
ConsumerRecords records = consumer.poll(Duration.ofMillis(Long.MAX_VALUE));
if (autoCommit) {
addRecordsToBuffer(records);
} else {
for (TopicPartition partition : records.partitions()) {
List> partitionRecords = records.records(partition);
addRecordsToBuffer(partitionRecords);
long lastOffset = partitionRecords.get(partitionRecords.size() - 1).offset();
consumer.commitSync(
Collections.singletonMap(partition, new OffsetAndMetadata(lastOffset + 1)));
logger().log(OpLevel.DEBUG,
StreamsResources.getBundle(KafkaStreamConstants.RESOURCE_BUNDLE_NAME),
"KafkaConsumerStream.committing.offset", partition, lastOffset);
}
}
}
} catch (WakeupException exc) {
} finally {
consumer.close();
}
}
}
/**
* Adds consumer records from provided {@code records} collection to stream input buffer.
*
* @param records
* records collection to add to stream input buffer
*
* @see #addInputToBuffer(Object)
*/
protected void addRecordsToBuffer(Iterable> records) {
for (ConsumerRecord record : records) {
String msgData = Utils.toString(record.value());
logger().log(OpLevel.DEBUG, StreamsResources.getBundle(KafkaStreamConstants.RESOURCE_BUNDLE_NAME),
"KafkaConsumerStream.next.message", msgData);
addInputToBuffer(record);
}
}
/**
* Closes Kafka consume.
*/
@Override
void closeInternals() {
if (consumer != null) {
consumer.wakeup();
}
}
}
}