fm.last.citrine.service.LogFileManagerImpl.java Source code

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Here is the source code for fm.last.citrine.service.LogFileManagerImpl.java

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/*
 * 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();
    }

}