001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020package org.crsh.text.renderers;
021
022import org.crsh.text.Color;
023import org.crsh.text.LineReader;
024import org.crsh.text.LineRenderer;
025import org.crsh.text.RenderAppendable;
026
027import java.lang.management.MemoryUsage;
028
029class MemoryUsageLineRenderer extends LineRenderer {
030
031  /** . */
032  private final MemoryUsage usage;
033
034  MemoryUsageLineRenderer(MemoryUsage usage) {
035    this.usage = usage;
036  }
037
038  @Override
039  public int getActualWidth() {
040    return 32;
041  }
042
043  @Override
044  public int getMinWidth() {
045    return 4;
046  }
047
048  @Override
049  public int getMinHeight(int width) {
050    return 1;
051  }
052
053  @Override
054  public int getActualHeight(int width) {
055    return 2;
056  }
057
058  @Override
059  public LineReader reader(int width) {
060    return reader(width, 2);
061  }
062
063  @Override
064  public LineReader reader(final int width, final int height) {
065    return new LineReader() {
066
067      /** . */
068      private int index = 0;
069
070      public boolean hasLine() {
071        return index < height;
072      }
073      public void renderLine(RenderAppendable to) throws IllegalStateException {
074        if (!hasLine()) {
075          throw new IllegalStateException();
076        }
077        long range = usage.getMax() - usage.getInit();
078        Color previous = null;
079
080        if (usage.getMax() > 0) {
081          long a = (width * usage.getUsed()) / (usage.getMax());
082          long b = (width * usage.getCommitted()) / (usage.getMax());
083          for (int i = 0;i < width;i++) {
084            Color current;
085            if (i >= b) {
086              // MAX
087              current = Color.green;
088            } else if (i >= a) {
089              // COMMITED
090              current = Color.blue;
091            } else {
092              // USED
093              current = Color.cyan;
094            }
095            if (previous != current) {
096              if (previous != null) {
097                to.leaveStyle();
098              }
099              to.enterStyle(current.bg());
100              previous = current;
101            }
102            to.append(' ');
103          }
104          if (previous != null) {
105            to.leaveStyle();
106          }
107        } else {
108          for (int i = 0;i < width;i++) {
109            to.append(' ');
110          }
111        }
112        index++;
113      }
114    };
115  }
116}