org.apache.usergrid.chop.webapp.view.log.LogLayout.java Source code

Introduction

Here is the source code for org.apache.usergrid.chop.webapp.view.log.LogLayout.java

Source

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 org.apache.usergrid.chop.webapp.view.log;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

import com.vaadin.ui.Button;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.TextArea;
import com.vaadin.ui.VerticalLayout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LogLayout extends VerticalLayout {

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

    private TextArea logArea;
    private RandomAccessFile r;
    private File file;

    public LogLayout() {
        initializeUIComponents();
        this.setSizeFull();
    }

    private void initializeUIComponents() {
        addLogArea();
        addRefreshButton();
    }

    private void addLogArea() {
        logArea = new TextArea("Coordinator Logs");

        // TODO make this file point configurable
        file = new File("/var/log/chop-webapp.log");
        try {
            r = new RandomAccessFile(file, "r");
        } catch (FileNotFoundException e) {
            LOG.error("Error while accessing file {}: {}", file, e);
        }
        logArea.setHeight("100%");
        logArea.setWidth("100%");
        getApplicationLog();
        addComponent(logArea);
        this.setComponentAlignment(logArea, Alignment.TOP_CENTER);
        this.setExpandRatio(logArea, 0.95f);
    }

    private void getApplicationLog() {
        logArea.setReadOnly(false);

        try {
            String str = null;
            StringBuilder log = new StringBuilder();
            log.append(logArea.getValue());
            while ((str = r.readLine()) != null) {
                log.append(str);
                log.append(System.getProperty("line.separator"));
            }
            r.seek(r.getFilePointer());
            logArea.setValue(log.toString());
            logArea.setCursorPosition(log.toString().length() - 1);

        } catch (IOException e) {
            e.printStackTrace();
        }
        logArea.setReadOnly(true);
    }

    private void addRefreshButton() {
        Button button = new Button("Refresh");
        button.setWidth("100px");
        button.addClickListener(new Button.ClickListener() {
            public void buttonClick(Button.ClickEvent event) {
                loadData();
            }
        });
        addComponent(button);
        setComponentAlignment(button, Alignment.BOTTOM_CENTER);
        this.setExpandRatio(button, 0.05f);

    }

    private void loadData() {
        getApplicationLog();
    }

}