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The Apache Log4j Implementation
/*
* 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.io.Serializable;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.appender.AppenderLoggingException;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.Node;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.validation.constraints.Required;
import org.apache.logging.log4j.core.layout.SerializedLayout;
import org.apache.logging.log4j.core.util.StringEncoder;
/**
* Sends log events to an Apache Kafka topic.
*/
@Plugin(name = "Kafka", category = Node.CATEGORY, elementType = Appender.ELEMENT_TYPE, printObject = true)
public final class KafkaAppender extends AbstractAppender {
/**
* Builds KafkaAppender instances.
* @param The type to build
*/
public static class Builder> extends AbstractAppender.Builder
implements org.apache.logging.log4j.core.util.Builder {
@PluginAttribute("topic")
private String topic;
@PluginAttribute(value = "syncSend", defaultBoolean = true)
private boolean syncSend;
@PluginElement("Properties")
private Property[] properties;
@SuppressWarnings("resource")
@Override
public KafkaAppender build() {
final KafkaManager kafkaManager = new KafkaManager(getConfiguration().getLoggerContext(), getName(), topic, syncSend, properties);
return new KafkaAppender(getName(), getLayout(), getFilter(), isIgnoreExceptions(), kafkaManager);
}
public String getTopic() {
return topic;
}
public Property[] getProperties() {
return properties;
}
public B setTopic(String topic) {
this.topic = topic;
return asBuilder();
}
public B setSyncSend(boolean syncSend) {
this.syncSend = syncSend;
return asBuilder();
}
public B setProperties(Property[] properties) {
this.properties = properties;
return asBuilder();
}
}
@Deprecated
public static KafkaAppender createAppender(
@PluginElement("Layout") final Layout layout,
@PluginElement("Filter") final Filter filter,
@Required(message = "No name provided for KafkaAppender") @PluginAttribute("name") final String name,
@PluginAttribute(value = "ignoreExceptions", defaultBoolean = true) final boolean ignoreExceptions,
@Required(message = "No topic provided for KafkaAppender") @PluginAttribute("topic") final String topic,
@PluginElement("Properties") final Property[] properties,
@PluginConfiguration final Configuration configuration) {
final KafkaManager kafkaManager = new KafkaManager(configuration.getLoggerContext(), name, topic, true, properties);
return new KafkaAppender(name, layout, filter, ignoreExceptions, kafkaManager);
}
/**
* Creates a builder for a KafkaAppender.
* @return a builder for a KafkaAppender.
*/
@PluginBuilderFactory
public static > B newBuilder() {
return new Builder().asBuilder();
}
private final KafkaManager manager;
private KafkaAppender(final String name, final Layout layout, final Filter filter,
final boolean ignoreExceptions, final KafkaManager manager) {
super(name, filter, layout, ignoreExceptions);
this.manager = Objects.requireNonNull(manager, "manager");
}
@Override
public void append(final LogEvent event) {
if (event.getLoggerName() != null && event.getLoggerName().startsWith("org.apache.kafka")) {
LOGGER.warn("Recursive logging from [{}] for appender [{}].", event.getLoggerName(), getName());
} else {
try {
final Layout layout = getLayout();
byte[] data;
if (layout != null) {
if (layout instanceof SerializedLayout) {
final byte[] header = layout.getHeader();
final byte[] body = layout.toByteArray(event);
data = new byte[header.length + body.length];
System.arraycopy(header, 0, data, 0, header.length);
System.arraycopy(body, 0, data, header.length, body.length);
} else {
data = layout.toByteArray(event);
}
} else {
data = StringEncoder.toBytes(event.getMessage().getFormattedMessage(), StandardCharsets.UTF_8);
}
manager.send(data);
} catch (final Exception e) {
LOGGER.error("Unable to write to Kafka [{}] for appender [{}].", manager.getName(), getName(), e);
throw new AppenderLoggingException("Unable to write to Kafka in appender: " + e.getMessage(), e);
}
}
}
@Override
public void start() {
super.start();
manager.startup();
}
@Override
public boolean stop(final long timeout, final TimeUnit timeUnit) {
setStopping();
boolean stopped = super.stop(timeout, timeUnit, false);
stopped &= manager.stop(timeout, timeUnit);
setStopped();
return stopped;
}
@Override
public String toString() {
return "KafkaAppender{" +
"name=" + getName() +
", state=" + getState() +
", topic=" + manager.getTopic() +
'}';
}
}