eu.stratosphere.nephele.jobmanager.web.LogfileInfoServlet.java Source code

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Here is the source code for eu.stratosphere.nephele.jobmanager.web.LogfileInfoServlet.java

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/***********************************************************************************************************************
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * 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 eu.stratosphere.nephele.jobmanager.web;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import eu.stratosphere.util.StringUtils;

public class LogfileInfoServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**
     * The log for this class.
     */
    private static final Log LOG = LogFactory.getLog(LogfileInfoServlet.class);

    private File logDir;

    public LogfileInfoServlet(File logDir) {
        this.logDir = logDir;
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        try {
            if ("stdout".equals(req.getParameter("get"))) {
                // Find current stdtout file
                for (File f : logDir.listFiles()) {
                    // contains "jobmanager" ".log" and no number in the end ->needs improvement
                    if (f.getName().equals("jobmanager-stdout.log")
                            || (f.getName().indexOf("jobmanager") != -1 && f.getName().indexOf(".out") != -1
                                    && !Character.isDigit(f.getName().charAt(f.getName().length() - 1)))) {

                        resp.setStatus(HttpServletResponse.SC_OK);
                        resp.setContentType("text/plain ");
                        writeFile(resp.getOutputStream(), f);
                        break;
                    }
                }
            } else {
                // Find current logfile
                for (File f : logDir.listFiles()) {
                    // contains "jobmanager" ".log" and no number in the end ->needs improvement
                    if (f.getName().equals("jobmanager-stderr.log")
                            || (f.getName().indexOf("jobmanager") != -1 && f.getName().indexOf(".log") != -1
                                    && !Character.isDigit(f.getName().charAt(f.getName().length() - 1)))) {

                        resp.setStatus(HttpServletResponse.SC_OK);
                        resp.setContentType("text/plain ");
                        writeFile(resp.getOutputStream(), f);
                        break;
                    }

                }
            }
        } catch (Throwable t) {
            resp.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            resp.getWriter().print(t.getMessage());
            if (LOG.isWarnEnabled()) {
                LOG.warn(StringUtils.stringifyException(t));
            }
        }
    }

    private static void writeFile(OutputStream out, File file) throws IOException {
        byte[] buf = new byte[4 * 1024]; // 4K buffer

        FileInputStream is = null;
        try {
            is = new FileInputStream(file);

            int bytesRead;
            while ((bytesRead = is.read(buf)) != -1) {
                out.write(buf, 0, bytesRead);
            }
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }

}