org.jabylon.log.viewer.pages.LogViewerPage.java Source code

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Here is the source code for org.jabylon.log.viewer.pages.LogViewerPage.java

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/**
 * (C) Copyright 2013 Jabylon (http://www.jabylon.org) and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
/**
 *
 */
package org.jabylon.log.viewer.pages;

import java.io.File;
import java.util.AbstractList;
import java.util.Deque;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.AjaxSelfUpdatingTimerBehavior;
import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.PriorityHeaderItem;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.IChoiceRenderer;
import org.apache.wicket.markup.html.form.TextArea;
import org.apache.wicket.markup.html.link.DownloadLink;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.util.time.Duration;
import org.jabylon.log.viewer.pages.util.CircularDeque;
import org.jabylon.log.viewer.pages.util.LogTail;
import org.jabylon.log.viewer.pages.util.LogbackUtil;
import org.jabylon.log.viewer.pages.util.LogbackUtil.LogLevel;
import org.jabylon.rest.ui.security.RestrictedComponent;
import org.jabylon.rest.ui.wicket.JabylonApplication;
import org.jabylon.rest.ui.wicket.pages.GenericPage;
import org.jabylon.security.CommonPermissions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Johannes Utzig (jutzig.dev@googlemail.com)
 *
 */
public class LogViewerPage extends GenericPage<String> implements RestrictedComponent {

    private static final long serialVersionUID = 1L;

    private static final Logger LOG = LoggerFactory.getLogger(LogViewerPage.class);

    private LogTail logTail;

    private IModel<String> logcontent;

    public LogViewerPage(PageParameters parameters) {
        super(parameters);
    }

    @Override
    protected void construct() {
        super.construct();

        final TextArea<String> nextLog = new TextArea<String>("nextLog", logcontent);
        add(nextLog);

        nextLog.setOutputMarkupId(true);
        nextLog.add(new AjaxSelfUpdatingTimerBehavior(Duration.seconds(1)) {

            private static final long serialVersionUID = 4831467550166004945L;

            @Override
            protected void onPostProcessTarget(AjaxRequestTarget target) {
                super.onPostProcessTarget(target);
                String chunk = readChunk(40);
                if (chunk == null)
                    chunk = "";
                logcontent.setObject(chunk);
                target.appendJavaScript("updateLog();");
                target.add(nextLog);
            }
        });
        final DropDownChoice<LogLevel> logLevel = new DropDownChoice<LogLevel>("loglevel", new EnumSetList(),
                new LogLevelRenderer());
        logLevel.setModel(Model.of(LogbackUtil.getLogLevel()));
        logLevel.add(new AjaxFormComponentUpdatingBehavior("onchange") {

            private static final long serialVersionUID = -4582780686636922915L;

            protected void onUpdate(AjaxRequestTarget target) {
                LogbackUtil.setLogLevel(logLevel.getModelObject());
            }
        });
        add(logLevel);

        File logFile = new File(LogbackUtil.getLogFiles().get(0).getLocation());
        add(new DownloadLink("dowloadLog", logFile));

    }

    @Override
    public void renderHead(IHeaderResponse response) {
        response.render(new PriorityHeaderItem(JavaScriptHeaderItem
                .forReference(JabylonApplication.get().getJavaScriptLibrarySettings().getJQueryReference())));
        response.render(new PriorityHeaderItem(JavaScriptHeaderItem.forUrl("/bootstrap/js/bootstrap.min.js")));
        super.renderHead(response);
    }

    private String readChunk(int lines) {
        Deque<String> buffer = new CircularDeque<String>(lines);
        logTail.nextChunk(lines, buffer);
        StringBuilder result = new StringBuilder();
        for (String string : buffer) {
            result.append(string);
            result.append("\r\n");
        }
        return result.toString();

    }

    @Override
    protected IModel<String> createModel(PageParameters params) {
        try {
            logTail = new LogTail(LogbackUtil.getLogFiles().get(0).getLocation());
            String content = readChunk(20);
            logcontent = Model.of(content);
        } catch (RuntimeException e) {
            logcontent = Model.of(e.getMessage());
            LOG.error("Failed to create LogTail", e);
        }
        return logcontent;
    }

    @Override
    public String getRequiredPermission() {
        return CommonPermissions.WORKSPACE_CONFIG;
    }

}

class LogLevelRenderer implements IChoiceRenderer<LogLevel> {

    private static final long serialVersionUID = 5412202409908394630L;

    @Override
    public Object getDisplayValue(LogLevel object) {
        return object.toString();
    }

    @Override
    public String getIdValue(LogLevel object, int index) {
        return object.toString();
    }

}

class EnumSetList extends AbstractList<LogLevel> {

    @Override
    public LogLevel get(int index) {
        return LogLevel.values()[index];
    }

    @Override
    public int size() {
        return LogLevel.values().length;
    }

}