mitm.application.djigzo.ws.impl.JamesManagerWSImpl.java Source code

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Here is the source code for mitm.application.djigzo.ws.impl.JamesManagerWSImpl.java

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/*
 * Copyright (c) 2008-2011, Martijn Brinkers, Djigzo.
 * 
 * This file is part of Djigzo email encryption.
 *
 * Djigzo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License 
 * version 3, 19 November 2007 as published by the Free Software 
 * Foundation.
 *
 * Djigzo 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public 
 * License along with Djigzo. If not, see <http://www.gnu.org/licenses/>
 *
 * Additional permission under GNU AGPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, 
 * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, 
 * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, 
 * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, 
 * wsdl4j-1.6.1.jar (or modified versions of these libraries), 
 * containing parts covered by the terms of Eclipse Public License, 
 * tyrex license, freemarker license, dom4j license, mx4j license,
 * Spice Software License, Common Development and Distribution License
 * (CDDL), Common Public License (CPL) the licensors of this Program grant 
 * you additional permission to convey the resulting work.
 */
package mitm.application.djigzo.ws.impl;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.regex.Pattern;

import mitm.application.djigzo.ws.JamesManagerWS;
import mitm.application.djigzo.ws.WSExceptionUtils;
import mitm.common.util.Check;
import mitm.common.util.FileLineNumberReader;
import mitm.common.util.FilteredFileLineNumberReader;
import mitm.common.util.StringReplaceUtils;
import mitm.common.ws.WebServiceCheckedException;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class JamesManagerWSImpl implements JamesManagerWS {
    private final static Logger logger = LoggerFactory.getLogger(JamesManagerWSImpl.class);

    private final static int MAX_NUMBER_OF_LOG_LINES = 1000;

    /*
     * Paths to the James log files
     */
    private final List<String> logFiles;

    public JamesManagerWSImpl(List<String> logFiles) {
        Check.notNull(logFiles, "logFiles");

        if (logFiles.size() == 0) {
            throw new IllegalArgumentException("logFiles should at least contain one file.");
        }

        this.logFiles = new ArrayList<String>(logFiles);

        logger.info("Monitoring James log files: " + logFiles);
    }

    @Override
    public int getLogLineCount(String searchPattern) throws WebServiceCheckedException {
        int count = 0;

        try {
            FileLineNumberReader reader = getReader(searchPattern);

            if (reader != null) {
                try {
                    count = reader.getLineCount();
                } finally {
                    IOUtils.closeQuietly(reader);
                }
            }
        } catch (IOException e) {
            logger.error("Log file does not exist or could not be read", e);
        } catch (RuntimeException e) {
            logger.error("getLogLineCount failed.", e);

            throw new WebServiceCheckedException(WSExceptionUtils.getExceptionMessage(e));
        }

        return count;
    }

    @Override
    public List<String> getLogLines(int startIndex, int nrOfItems, String searchPattern)
            throws WebServiceCheckedException {
        List<String> lines = null;

        try {
            /*
             * Sanity check
             */
            if (nrOfItems > MAX_NUMBER_OF_LOG_LINES) {
                throw new WebServiceCheckedException("nrOfItems exceeds the maximum of " + MAX_NUMBER_OF_LOG_LINES);
            }

            FileLineNumberReader reader = getReader(searchPattern);

            if (reader != null) {
                try {
                    lines = reader.readLines(startIndex, nrOfItems);

                    /*
                     * We need to make sure that the lines do not contain a character that is not
                     * valid for XML (JAXB does not escape these characters).
                     */
                    lines = StringReplaceUtils.replaceNonXML(lines, "?");
                } finally {
                    IOUtils.closeQuietly(reader);
                }
            }
        } catch (IOException e) {
            logger.error("Log file does not exist or could not be read", e);
        } catch (RuntimeException e) {
            logger.error("getLogLines failed.", e);

            throw new WebServiceCheckedException(WSExceptionUtils.getExceptionMessage(e));
        }

        if (lines == null) {
            lines = Collections.emptyList();
        }

        return lines;
    }

    private FileLineNumberReader getReader(String searchPattern) throws FileNotFoundException {
        Pattern regExpr = null;

        if (searchPattern != null && searchPattern.length() > 0) {
            regExpr = Pattern.compile(searchPattern);
        }

        Collection<File> files = new ArrayList<File>(logFiles.size());

        for (String logFile : logFiles) {
            File file = new File(logFile);

            if (file.exists() && file.canRead()) {
                files.add(file);
            }
        }

        FileLineNumberReader reader = null;

        if (files.size() > 0) {
            reader = new FilteredFileLineNumberReader(files, regExpr);
        }

        return reader;
    }
}