com.metamx.druid.http.FileRequestLogger.java Source code

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Here is the source code for com.metamx.druid.http.FileRequestLogger.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package com.metamx.druid.http;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Throwables;
import com.google.common.io.Closeables;
import com.metamx.common.concurrent.ScheduledExecutors;
import com.metamx.common.lifecycle.LifecycleStart;
import com.metamx.common.lifecycle.LifecycleStop;
import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.joda.time.MutableDateTime;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
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 Object lock = new Object();

    private volatile DateTime currentDay;
    private volatile FileWriter fileWriter;

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

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

            MutableDateTime mutableDateTime = new DateTime().toMutableDateTime();
            mutableDateTime.setMillisOfDay(0);
            currentDay = mutableDateTime.toDateTime();

            fileWriter = new FileWriter(new File(baseDir, currentDay.toString("yyyy-MM-dd'.log'")), true);
            long nextDay = currentDay.plusDays(1).getMillis();
            Duration delay = new Duration(nextDay - new DateTime().getMillis());

            ScheduledExecutors.scheduleWithFixedDelay(exec, delay, Duration.standardDays(1),
                    new Callable<ScheduledExecutors.Signal>() {
                        @Override
                        public ScheduledExecutors.Signal call() {
                            currentDay = currentDay.plusDays(1);

                            try {
                                synchronized (lock) {
                                    Closeables.closeQuietly(fileWriter);
                                    fileWriter = new FileWriter(new File(baseDir, currentDay.toString()), true);
                                }
                            } catch (Exception e) {
                                Throwables.propagate(e);
                            }

                            return ScheduledExecutors.Signal.REPEAT;
                        }
                    });
        } catch (IOException e) {
            Throwables.propagate(e);
        }
    }

    @LifecycleStop
    public void stop() {
        synchronized (lock) {
            Closeables.closeQuietly(fileWriter);
        }
    }

    @Override
    public void log(RequestLogLine requestLogLine) throws Exception {
        synchronized (lock) {
            fileWriter.write(String.format("%s%n", requestLogLine.getLine(objectMapper)));
            fileWriter.flush();
        }
    }
}