Package fm.last.citrine.service

Source Code of fm.last.citrine.service.LogFileManagerImpl

/*
* Copyright 2010 Last.fm
*
*  Licensed 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 fm.last.citrine.service;

import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.AgeFileFilter;
import org.apache.commons.io.filefilter.AndFileFilter;
import org.apache.commons.io.filefilter.FileFileFilter;
import org.apache.commons.io.filefilter.IOFileFilter;
import org.apache.commons.io.filefilter.WildcardFileFilter;
import org.apache.log4j.Logger;
import org.joda.time.DateTime;

import fm.last.commons.io.LastFileUtils;

/**
* Log file manager implementation which processes files written to disk under a configured folder location.
*/
public class LogFileManagerImpl implements LogFileManager {

  private static Logger log = Logger.getLogger(LogFileManagerImpl.class);

  private File baseLogFolder = new File(System.getProperty("java.io.tmpdir"));
  private final IOFileFilter logFileFilter = new AndFileFilter(new WildcardFileFilter("*.log*"), FileFileFilter.FILE);

  /**
   * Creates a new instance which will read log files under the base log path (java tmp dir by default).
   */
  public LogFileManagerImpl() {
  }

  /**
   * Creates a new instance which will read log files under the passed base log path.
   */
  public LogFileManagerImpl(String baseLogPath) {
    setBaseLogPath(baseLogPath);
  }

  /**
   * Creates a new instance which will read log files under the passed base log path.
   */
  public LogFileManagerImpl(File baseLogFolder) {
    this.baseLogFolder = baseLogFolder;
  }

  @Override
  public List<String> findAllLogFiles() {
    String[] files = baseLogFolder.list(logFileFilter);
    List<String> logFiles = new ArrayList<String>();
    if (files != null) {
      for (String logFile : files) {
        logFiles.add(logFile);
      }
    }
    Collections.sort(logFiles, Collections.reverseOrder());
    return logFiles;
  }

  @Override
  public String tail(String logFileName, long tailBytes) throws IOException {
    File logFile = new File(baseLogFolder, logFileName);
    return LastFileUtils.tail(logFile, tailBytes);
  }

  public void setBaseLogPath(String baseLogPath) {
    this.baseLogFolder = new File(baseLogPath);
  }

  @Override
  public void deleteBefore(DateTime deleteBefore) throws IOException {
    log.debug("Deleting log files older than " + deleteBefore + " from " + baseLogFolder);
    File[] filesToDelete = baseLogFolder.listFiles((FileFilter) new AndFileFilter(logFileFilter, new AgeFileFilter(
        deleteBefore.toDate())));
    for (File fileToDelete : filesToDelete) {
      if (log.isDebugEnabled()) {
        log.debug("Deleting " + fileToDelete);
      }
      FileUtils.forceDelete(fileToDelete);
    }
  }

  @Override
  public boolean exists(String logFileName) {
    File logFile = new File(baseLogFolder, logFileName);
    return logFile.exists();
  }

}
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