org.apache.druid.server.log.FileRequestLogger.java Source code

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Here is the source code for org.apache.druid.server.log.FileRequestLogger.java

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/*
 * 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.druid.server.log;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.druid.java.util.common.DateTimes;
import org.apache.druid.java.util.common.concurrent.ScheduledExecutors;
import org.apache.druid.java.util.common.guava.CloseQuietly;
import org.apache.druid.java.util.common.lifecycle.LifecycleStart;
import org.apache.druid.java.util.common.lifecycle.LifecycleStop;
import org.apache.druid.server.RequestLogLine;
import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.joda.time.MutableDateTime;
import org.joda.time.chrono.ISOChronology;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.Callable;
import java.util.concurrent.ScheduledExecutorService;

/**
 */
public class FileRequestLogger implements RequestLogger {
    private final ObjectMapper objectMapper;
    private final ScheduledExecutorService exec;
    private final File baseDir;
    private final DateTimeFormatter filePattern;

    private final Object lock = new Object();

    private DateTime currentDay;
    private OutputStreamWriter fileWriter;

    public FileRequestLogger(ObjectMapper objectMapper, ScheduledExecutorService exec, File baseDir,
            String filePattern) {
        this.exec = exec;
        this.objectMapper = objectMapper;
        this.baseDir = baseDir;
        this.filePattern = DateTimeFormat.forPattern(filePattern);
    }

    @LifecycleStart
    @Override
    public void start() {
        try {
            baseDir.mkdirs();

            MutableDateTime mutableDateTime = DateTimes.nowUtc().toMutableDateTime(ISOChronology.getInstanceUTC());
            mutableDateTime.setMillisOfDay(0);
            synchronized (lock) {
                currentDay = mutableDateTime.toDateTime(ISOChronology.getInstanceUTC());

                fileWriter = getFileWriter();
            }
            long nextDay = currentDay.plusDays(1).getMillis();
            Duration initialDelay = new Duration(nextDay - System.currentTimeMillis());

            ScheduledExecutors.scheduleWithFixedDelay(exec, initialDelay, Duration.standardDays(1),
                    new Callable<ScheduledExecutors.Signal>() {
                        @Override
                        public ScheduledExecutors.Signal call() {
                            try {
                                synchronized (lock) {
                                    currentDay = currentDay.plusDays(1);
                                    CloseQuietly.close(fileWriter);
                                    fileWriter = getFileWriter();
                                }
                            } catch (Exception e) {
                                throw new RuntimeException(e);
                            }

                            return ScheduledExecutors.Signal.REPEAT;
                        }
                    });
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private OutputStreamWriter getFileWriter() throws FileNotFoundException {
        return new OutputStreamWriter(new FileOutputStream(new File(baseDir, filePattern.print(currentDay)), true),
                StandardCharsets.UTF_8);
    }

    @LifecycleStop
    @Override
    public void stop() {
        synchronized (lock) {
            CloseQuietly.close(fileWriter);
        }
    }

    @Override
    public void logNativeQuery(RequestLogLine requestLogLine) throws IOException {
        logToFile(requestLogLine.getNativeQueryLine(objectMapper));
    }

    @Override
    public void logSqlQuery(RequestLogLine requestLogLine) throws IOException {
        logToFile(requestLogLine.getSqlQueryLine(objectMapper));
    }

    private void logToFile(final String message) throws IOException {
        synchronized (lock) {
            fileWriter.write(message);
            fileWriter.write("\n");
            fileWriter.flush();
        }
    }

    @Override
    public String toString() {
        return "FileRequestLogger{" + "baseDir=" + baseDir + '}';
    }
}