ch.qos.logback.core.status.ViewStatusMessagesServletBase Maven / Gradle / Ivy

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Statistical sampling library for use in virtualdataset libraries, based on apache commons math 4
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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.status;

import static ch.qos.logback.core.CoreConstants.LINE_SEPARATOR;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.List;

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

import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.helpers.Transform;
import ch.qos.logback.core.util.CachingDateFormatter;

abstract public class ViewStatusMessagesServletBase extends HttpServlet {

    private static final long serialVersionUID = -3551928133801157219L;
    private static CachingDateFormatter SDF = new CachingDateFormatter("yyyy-MM-dd HH:mm:ss");

    static String SUBMIT = "submit";
    static String CLEAR = "Clear";

    protected abstract StatusManager getStatusManager(HttpServletRequest req, HttpServletResponse resp);

    protected abstract String getPageTitle(HttpServletRequest req, HttpServletResponse resp);

    int count;

    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        count = 0;
        StatusManager sm = getStatusManager(req, resp);

        resp.setContentType("text/html");
        PrintWriter output = resp.getWriter();

        output.append("\r\n");
        output.append("\r\n");
        printCSS(req.getContextPath(), output);
        output.append("\r\n");
        output.append("\r\n");
        output.append(getPageTitle(req, resp));

        output.append("\r\n");
        output.append("");
        output.append("\r\n");

        if (CLEAR.equalsIgnoreCase(req.getParameter(SUBMIT))) {
            sm.clear();
            sm.add(new InfoStatus("Cleared all status messages", this));
        }

        output.append("");
        StringBuilder buf = new StringBuilder();
        if (sm != null) {
            printList(buf, sm);
        } else {
            output.append("Could not find status manager");
        }
        output.append(buf);
        output.append("");
        output.append("\r\n");
        output.append("\r\n");
        output.flush();
        output.close();
    }

    public void printCSS(String localRef, PrintWriter output) {
        output.append("  \r\n");

    }

    public void printList(StringBuilder buf, StatusManager sm) {
        buf.append("\r\n");
        printHeader(buf);
        List statusList = sm.getCopyOfStatusList();
        for (Status s : statusList) {
            count++;
            printStatus(buf, s);
        }
        buf.append("\r\n");
    }

    public void printHeader(StringBuilder buf) {
        buf.append("  \r\n");
        buf.append("    Date \r\n");
        buf.append("    Level\r\n");
        buf.append("    Origin\r\n");
        buf.append("    Message\r\n");
        buf.append("  \r\n");

    }

    String statusLevelAsString(Status s) {
        switch (s.getEffectiveLevel()) {
        case Status.INFO:
            return "INFO";
        case Status.WARN:
            return "WARN";
        case Status.ERROR:
            return "ERROR";
        }
        return null;
    }

    String abbreviatedOrigin(Status s) {
        Object o = s.getOrigin();
        if (o == null) {
            return null;
        }
        String fqClassName = o.getClass().getName();
        int lastIndex = fqClassName.lastIndexOf(CoreConstants.DOT);
        if (lastIndex != -1) {
            return fqClassName.substring(lastIndex + 1, fqClassName.length());
        } else {
            return fqClassName;
        }
    }

    private void printStatus(StringBuilder buf, Status s) {
        String trClass;
        if (count % 2 == 0) {
            trClass = "even";
        } else {
            trClass = "odd";
        }
        buf.append("  \r\n");
        String dateStr = SDF.format(s.getDate());
        buf.append("    ").append(dateStr).append("\r\n");
        buf.append("    ").append(statusLevelAsString(s)).append("\r\n");
        buf.append("    ").append(abbreviatedOrigin(s)).append("\r\n");
        buf.append("    ").append(s.getMessage()).append("\r\n");
        buf.append("  \r\n");
        if (s.getThrowable() != null) {
            printThrowable(buf, s.getThrowable());
        }
    }

    private void printThrowable(StringBuilder buf, Throwable t) {
        buf.append("  \r\n");
        buf.append("    ");
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        t.printStackTrace(pw);
        buf.append(Transform.escapeTags(sw.getBuffer()));
        buf.append("    \r\n");
        buf.append("  \r\n");

    }
}