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
020 package org.crsh.text.renderers;
021
022 import org.crsh.text.Color;
023 import org.crsh.text.LineReader;
024 import org.crsh.text.RenderAppendable;
025 import org.crsh.text.Renderer;
026
027 import java.lang.management.MemoryUsage;
028
029 public class MemoryUsageRenderer extends Renderer {
030
031 /** . */
032 private final MemoryUsage usage;
033
034 public MemoryUsageRenderer(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 }