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package org.apache.hadoop.hive.ql.log;
/*
* 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.
*/
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
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.AbstractOutputStreamAppender;
import org.apache.logging.log4j.core.appender.RandomAccessFileManager;
import org.apache.logging.log4j.core.config.Configuration;
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.PluginConfiguration;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.apache.logging.log4j.core.layout.PatternLayout;
import org.apache.logging.log4j.core.net.Advertiser;
import org.apache.logging.log4j.core.util.Booleans;
import org.apache.logging.log4j.core.util.Integers;
/**
* A File Appender that does not append log records after it has been stopped.
* Based on
* https://github.com/apache/logging-log4j2/blob/c02e7de69e81c174f1ea0be43639d9e231fa5283/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/RandomAccessFileAppender.java
* (which is from log4j 2.6.2)
*/
@Plugin(name = "HushableRandomAccessFile", category = "Core", elementType = "appender", printObject = true)
public final class HushableRandomAccessFileAppender extends
AbstractOutputStreamAppender {
private final String fileName;
private Object advertisement;
private final Advertiser advertiser;
private HushableRandomAccessFileAppender(final String name, final Layout layout,
final Filter filter, final RandomAccessFileManager manager, final String filename,
final boolean ignoreExceptions, final boolean immediateFlush, final Advertiser advertiser) {
super(name, layout, filter, ignoreExceptions, immediateFlush, manager);
if (advertiser != null) {
final Map configuration = new HashMap<>(
layout.getContentFormat());
configuration.putAll(manager.getContentFormat());
configuration.put("contentType", layout.getContentType());
configuration.put("name", name);
advertisement = advertiser.advertise(configuration);
}
this.fileName = filename;
this.advertiser = advertiser;
}
@Override
public void stop() {
super.stop();
if (advertiser != null) {
advertiser.unadvertise(advertisement);
}
}
/**
* Write the log entry rolling over the file when required.
*
* @param event The LogEvent.
*/
@Override
public void append(final LogEvent event) {
// Unlike RandomAccessFileAppender, do not append log when stopped.
if (isStopped()) {
// Don't try to log anything when appender is stopped
return;
}
// Leverage the nice batching behaviour of async Loggers/Appenders:
// we can signal the file manager that it needs to flush the buffer
// to disk at the end of a batch.
// From a user's point of view, this means that all log events are
// _always_ available in the log file, without incurring the overhead
// of immediateFlush=true.
getManager().setEndOfBatch(event.isEndOfBatch()); // FIXME manager's EndOfBatch threadlocal can be deleted
// LOG4J2-1292 utilize gc-free Layout.encode() method: taken care of in superclass
super.append(event);
}
/**
* Returns the file name this appender is associated with.
*
* @return The File name.
*/
public String getFileName() {
return this.fileName;
}
/**
* Returns the size of the file manager's buffer.
* @return the buffer size
*/
public int getBufferSize() {
return getManager().getBufferSize();
}
// difference from standard File Appender:
// locking is not supported and buffering cannot be switched off
/**
* Create a File Appender.
*
* @param fileName The name and path of the file.
* @param append "True" if the file should be appended to, "false" if it
* should be overwritten. The default is "true".
* @param name The name of the Appender.
* @param immediateFlush "true" if the contents should be flushed on every
* write, "false" otherwise. The default is "true".
* @param bufferSizeStr The buffer size, defaults to {@value RandomAccessFileManager#DEFAULT_BUFFER_SIZE}.
* @param ignore If {@code "true"} (default) exceptions encountered when appending events are logged; otherwise
* they are propagated to the caller.
* @param layout The layout to use to format the event. If no layout is
* provided the default PatternLayout will be used.
* @param filter The filter, if any, to use.
* @param advertise "true" if the appender configuration should be
* advertised, "false" otherwise.
* @param advertiseURI The advertised URI which can be used to retrieve the
* file contents.
* @param config The Configuration.
* @return The FileAppender.
*/
@PluginFactory
public static HushableRandomAccessFileAppender createAppender(
@PluginAttribute("fileName") final String fileName,
@PluginAttribute("append") final String append,
@PluginAttribute("name") final String name,
@PluginAttribute("immediateFlush") final String immediateFlush,
@PluginAttribute("bufferSize") final String bufferSizeStr,
@PluginAttribute("ignoreExceptions") final String ignore,
@PluginElement("Layout") Layout layout,
@PluginElement("Filter") final Filter filter,
@PluginAttribute("advertise") final String advertise,
@PluginAttribute("advertiseURI") final String advertiseURI,
@PluginConfiguration final Configuration config) {
final boolean isAppend = Booleans.parseBoolean(append, true);
final boolean isFlush = Booleans.parseBoolean(immediateFlush, true);
final boolean ignoreExceptions = Booleans.parseBoolean(ignore, true);
final boolean isAdvertise = Boolean.parseBoolean(advertise);
final int bufferSize = Integers.parseInt(bufferSizeStr, 256 * 1024 /* RandomAccessFileManager.DEFAULT_BUFFER_SIZE */);
if (name == null) {
LOGGER.error("No name provided for FileAppender");
return null;
}
if (fileName == null) {
LOGGER.error("No filename provided for FileAppender with name "
+ name);
return null;
}
if (layout == null) {
layout = PatternLayout.createDefaultLayout();
}
final RandomAccessFileManager manager = RandomAccessFileManager.getFileManager(
fileName, isAppend, isFlush, bufferSize, advertiseURI, layout, config
);
if (manager == null) {
return null;
}
return new HushableRandomAccessFileAppender(
name, layout, filter, manager, fileName, ignoreExceptions, isFlush,
isAdvertise ? config.getAdvertiser() : null
);
}
}
