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Statistical sampling library for use in virtdata libraries, based
on apache commons math 4
/*
* 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.logging.log4j.core.appender.mom.kafka;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.apache.kafka.clients.producer.Callback;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.AbstractManager;
import org.apache.logging.log4j.core.appender.ManagerFactory;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.util.Log4jThread;
public class KafkaManager extends AbstractManager {
public static final String DEFAULT_TIMEOUT_MILLIS = "30000";
/**
* package-private access for testing.
*/
static KafkaProducerFactory producerFactory = new DefaultKafkaProducerFactory();
private final Properties config = new Properties();
private Producer producer;
private final int timeoutMillis;
private final String topic;
private final String key;
private final boolean syncSend;
private static final KafkaManagerFactory factory = new KafkaManagerFactory();
/*
* The Constructor should have been declared private as all Managers are create by the internal factory;
*/
public KafkaManager(final LoggerContext loggerContext, final String name, final String topic, final boolean syncSend,
final Property[] properties, final String key) {
super(loggerContext, name);
this.topic = Objects.requireNonNull(topic, "topic");
this.syncSend = syncSend;
config.setProperty("key.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");
config.setProperty("value.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");
config.setProperty("batch.size", "0");
for (final Property property : properties) {
config.setProperty(property.getName(), property.getValue());
}
this.key = key;
this.timeoutMillis = Integer.parseInt(config.getProperty("timeout.ms", DEFAULT_TIMEOUT_MILLIS));
}
@Override
public boolean releaseSub(final long timeout, final TimeUnit timeUnit) {
if (timeout > 0) {
closeProducer(timeout, timeUnit);
} else {
closeProducer(timeoutMillis, TimeUnit.MILLISECONDS);
}
return true;
}
private void closeProducer(final long timeout, final TimeUnit timeUnit) {
if (producer != null) {
// This thread is a workaround for this Kafka issue: https://issues.apache.org/jira/browse/KAFKA-1660
final Thread closeThread = new Log4jThread(new Runnable() {
@Override
public void run() {
if (producer != null) {
producer.close();
}
}
}, "KafkaManager-CloseThread");
closeThread.setDaemon(true); // avoid blocking JVM shutdown
closeThread.start();
try {
closeThread.join(timeUnit.toMillis(timeout));
} catch (final InterruptedException ignore) {
Thread.currentThread().interrupt();
// ignore
}
}
}
public void send(final byte[] msg) throws ExecutionException, InterruptedException, TimeoutException {
if (producer != null) {
byte[] newKey = null;
if(key != null && key.contains("${")) {
newKey = getLoggerContext().getConfiguration().getStrSubstitutor().replace(key).getBytes(StandardCharsets.UTF_8);
} else if (key != null) {
newKey = key.getBytes(StandardCharsets.UTF_8);
}
final ProducerRecord newRecord = new ProducerRecord<>(topic, newKey, msg);
if (syncSend) {
final Future response = producer.send(newRecord);
response.get(timeoutMillis, TimeUnit.MILLISECONDS);
} else {
producer.send(newRecord, new Callback() {
@Override
public void onCompletion(final RecordMetadata metadata, final Exception e) {
if (e != null) {
LOGGER.error("Unable to write to Kafka in appender [" + getName() + "]", e);
}
}
});
}
}
}
public void startup() {
producer = producerFactory.newKafkaProducer(config);
}
public String getTopic() {
return topic;
}
public static KafkaManager getManager(final LoggerContext loggerContext, final String name, final String topic,
final boolean syncSend, final Property[] properties, final String key) {
StringBuilder sb = new StringBuilder(name);
for (Property prop: properties) {
sb.append(" ").append(prop.getName()).append("=").append(prop.getValue());
}
return getManager(sb.toString(), factory, new FactoryData(loggerContext, topic, syncSend, properties, key));
}
private static class FactoryData {
private final LoggerContext loggerContext;
private final String topic;
private final boolean syncSend;
private final Property[] properties;
private final String key;
public FactoryData(final LoggerContext loggerContext, final String topic, final boolean syncSend,
final Property[] properties, final String key) {
this.loggerContext = loggerContext;
this.topic = topic;
this.syncSend = syncSend;
this.properties = properties;
this.key = key;
}
}
private static class KafkaManagerFactory implements ManagerFactory {
@Override
public KafkaManager createManager(String name, FactoryData data) {
return new KafkaManager(data.loggerContext, name, data.topic, data.syncSend, data.properties, data.key);
}
}
}