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36
37 package com.sun.demo.scripting.jconsole;
38
39 import com.sun.tools.jconsole.*;
40 import java.awt.*;
41 import java.awt.event.*;
42 import java.io.*;
43 import java.lang.reflect.*;
44 import java.util.concurrent.CountDownLatch  ;
45 import javax.script.*;
46 import javax.swing.*;
47 import javax.swing.event.*;
48 import java.util.*;
49
50
54 public class ScriptJConsolePlugin extends JConsolePlugin
55 implements ScriptShellPanel.CommandProcessor {
56 private volatile ScriptShellPanel window;
58 private Map<String , JPanel> tabs;
60
61 private volatile ScriptEngine engine;
63
64 private CountDownLatch engineReady = new CountDownLatch (1);
67
68 private String extension;
71
72 private volatile String prompt;
75
76
79 public ScriptJConsolePlugin() {
80 }
81
82 @Override public Map<String , JPanel> getTabs() {
83 createScriptEngine();
85
86 window = new ScriptShellPanel(this);
88
89 tabs = new HashMap<String , JPanel>();
91 tabs.put("Script Shell", window);
92
93 new Thread (new Runnable () {
94 public void run() {
95 initScriptEngine();
97 engineReady.countDown();
98 }
99 }).start();
100 return tabs;
101 }
102
103 @Override public SwingWorker<?,?> newSwingWorker() {
104 return null;
105 }
106
107 @Override public void dispose() {
108 window.dispose();
109 }
110
111 public String getPrompt() {
112 return prompt;
113 }
114
115 public String executeCommand(String cmd) {
116 String res;
117 try {
118 engineReady.await();
119 Object tmp = engine.eval(cmd);
120 res = (tmp == null)? null : tmp.toString();
121 } catch (InterruptedException ie) {
122 res = ie.getMessage();
123 } catch (ScriptException se) {
124 res = se.getMessage();
125 }
126 return res;
127 }
128
129 private void createScriptEngine() {
131 ScriptEngineManager manager = new ScriptEngineManager();
132 String language = getScriptLanguage();
133 engine = manager.getEngineByName(language);
134 if (engine == null) {
135 throw new RuntimeException ("cannot load " + language + " engine");
136 }
137 extension = engine.getFactory().getExtensions().get(0);
138 prompt = extension + ">";
139 engine.setBindings(createBindings(), ScriptContext.ENGINE_SCOPE);
140 }
141
142 private static final String LANGUAGE_KEY = "com.sun.demo.jconsole.console.language";
144
145 private String getScriptLanguage() {
146 String lang = System.getProperty(LANGUAGE_KEY);
148 if (lang == null) {
149 lang = "JavaScript";
151 }
152 return lang;
153 }
154
155 private Bindings createBindings() {
157 Map<String , Object > map =
158 Collections.synchronizedMap(new HashMap<String , Object >());
159 return new SimpleBindings(map);
160 }
161
162 private void initScriptEngine() {
164 setGlobals();
166 loadInitFile();
168 loadUserInitFile();
170 }
171
172 private void setGlobals() {
174 engine.put("engine", engine);
175 engine.put("window", window);
176 engine.put("plugin", this);
177 }
178
179 private void loadInitFile() {
181 String oldFilename = (String ) engine.get(ScriptEngine.FILENAME);
182 engine.put(ScriptEngine.FILENAME, "<built-in jconsole." + extension + ">");
183 try {
184 Class myClass = this.getClass();
185 InputStream stream = myClass.getResourceAsStream("/resources/jconsole." +
186 extension);
187 if (stream != null) {
188 engine.eval(new InputStreamReader(new BufferedInputStream(stream)));
189 }
190 } catch (Exception exp) {
191 exp.printStackTrace();
192 } finally {
194 engine.put(ScriptEngine.FILENAME, oldFilename);
195 }
196 }
197
198 private void loadUserInitFile() {
200 String oldFilename = (String ) engine.get(ScriptEngine.FILENAME);
201 String home = System.getProperty("user.home");
202 if (home == null) {
203 return;
205 }
206 String fileName = home + File.separator + "jconsole." + extension;
207 if (! (new File(fileName).exists())) {
208 return;
210 }
211 engine.put(ScriptEngine.FILENAME, fileName);
212 try {
213 engine.eval(new FileReader(fileName));
214 } catch (Exception exp) {
215 exp.printStackTrace();
216 } finally {
218 engine.put(ScriptEngine.FILENAME, oldFilename);
219 }
220 }
221 }
222 |
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