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comparison agent/src/share/classes/sun/jvm/hotspot/utilities/soql/SOQLEngine.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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1 /* | |
2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.utilities.soql; | |
26 | |
27 import java.util.*; | |
28 import sun.jvm.hotspot.oops.*; | |
29 import sun.jvm.hotspot.memory.*; | |
30 import sun.jvm.hotspot.runtime.*; | |
31 import sun.jvm.hotspot.utilities.*; | |
32 | |
33 /** | |
34 * This is SOQL (Simple Object Query Language) engine. This | |
35 * uses JavaScript engine for the "select" and "where" expression | |
36 * parts. | |
37 */ | |
38 public class SOQLEngine extends JSJavaScriptEngine { | |
39 public static synchronized SOQLEngine getEngine() { | |
40 if (soleInstance == null) { | |
41 soleInstance = new SOQLEngine(); | |
42 } | |
43 return soleInstance; | |
44 } | |
45 | |
46 /** | |
47 Query is of the form | |
48 | |
49 select <java script code to select> | |
50 [ from [instanceof] <class name> [<identifier>] | |
51 [ where <java script boolean expression> ] | |
52 ] | |
53 */ | |
54 public synchronized void executeQuery(String query, ObjectVisitor visitor) | |
55 throws SOQLException { | |
56 debugPrint("query : " + query); | |
57 StringTokenizer st = new StringTokenizer(query); | |
58 if (st.hasMoreTokens()) { | |
59 String first = st.nextToken(); | |
60 if (! first.equals("select") ) { | |
61 throw new SOQLException("query syntax error: no 'select' clause"); | |
62 } | |
63 } else { | |
64 throw new SOQLException("query syntax error: no 'select' clause"); | |
65 } | |
66 | |
67 int selectStart = query.indexOf("select"); | |
68 int fromStart = query.indexOf("from"); | |
69 | |
70 String selectExpr = null; | |
71 String className = null; | |
72 boolean isInstanceOf = false; | |
73 String whereExpr = null; | |
74 String identifier = null; | |
75 | |
76 if (fromStart != -1) { | |
77 selectExpr = query.substring(selectStart + "select".length(), fromStart); | |
78 st = new StringTokenizer(query.substring(fromStart + "from".length())); | |
79 | |
80 if (st.hasMoreTokens()) { | |
81 String tmp = st.nextToken(); | |
82 if (tmp.equals("instanceof")) { | |
83 isInstanceOf = true; | |
84 if (! st.hasMoreTokens()) { | |
85 throw new SOQLException("no class name after 'instanceof'"); | |
86 } | |
87 className = st.nextToken(); | |
88 } else { | |
89 className = tmp; | |
90 } | |
91 } else { | |
92 throw new SOQLException("query syntax error: class name must follow 'from'"); | |
93 } | |
94 | |
95 if (st.hasMoreTokens()) { | |
96 identifier = st.nextToken(); | |
97 if (identifier.equals("where")) { | |
98 throw new SOQLException("query syntax error: identifier should follow class name"); | |
99 } | |
100 if (st.hasMoreTokens()) { | |
101 String tmp = st.nextToken(); | |
102 if (! tmp.equals("where")) { | |
103 throw new SOQLException("query syntax error: 'where' clause expected after 'from' clause"); | |
104 } | |
105 int whereEnd = query.lastIndexOf("where") + 5; // "where".length | |
106 whereExpr = query.substring(whereEnd); | |
107 } | |
108 } else { | |
109 throw new SOQLException("query syntax error: identifier should follow class name"); | |
110 } | |
111 } else { // no from clause | |
112 selectExpr = query.substring(selectStart + "select".length(), query.length()); | |
113 } | |
114 | |
115 executeQuery(new SOQLQuery(selectExpr, isInstanceOf, className, identifier, whereExpr), visitor); | |
116 } | |
117 | |
118 private void executeQuery(SOQLQuery q, ObjectVisitor visitor) throws SOQLException { | |
119 InstanceKlass kls = null; | |
120 if (q.className != null) { | |
121 kls = SystemDictionaryHelper.findInstanceKlass(q.className); | |
122 if (kls == null) { | |
123 throw new SOQLException(q.className + " is not found!"); | |
124 } | |
125 } | |
126 | |
127 | |
128 StringBuffer buf = new StringBuffer(); | |
129 buf.append("function result("); | |
130 if (q.identifier != null) { | |
131 buf.append(q.identifier); | |
132 } | |
133 buf.append(") { return "); | |
134 buf.append(q.selectExpr.replace('\n', ' ')); | |
135 buf.append("; }"); | |
136 | |
137 String selectCode = buf.toString(); | |
138 debugPrint(selectCode); | |
139 String whereCode = null; | |
140 if (q.whereExpr != null) { | |
141 buf = new StringBuffer(); | |
142 buf.append("function filter("); | |
143 buf.append(q.identifier); | |
144 buf.append(") { return "); | |
145 buf.append(q.whereExpr.replace('\n', ' ')); | |
146 buf.append("; }"); | |
147 whereCode = buf.toString(); | |
148 debugPrint(whereCode); | |
149 } else { | |
150 whereCode = "filter = null;"; | |
151 } | |
152 | |
153 beginQuery(); | |
154 // compile select expression and where condition | |
155 evalString(selectCode, "", 1); | |
156 evalString(whereCode, "", 1); | |
157 | |
158 // iterate thru heap, if needed | |
159 if (q.className != null) { | |
160 try { | |
161 iterateOops(kls, visitor, q.isInstanceOf); | |
162 } finally { | |
163 endQuery(); | |
164 } | |
165 } else { | |
166 // simple "select <expr>" query | |
167 try { | |
168 Object select = call("result", new Object[] {}); | |
169 visitor.visit(select); | |
170 } catch (Exception e) { | |
171 e.printStackTrace(); | |
172 } | |
173 } | |
174 } | |
175 | |
176 private void dispatchObject(Oop oop, ObjectVisitor visitor, boolean filterExists) { | |
177 JSJavaObject jsObj = factory.newJSJavaObject(oop); | |
178 Object[] args = new Object[] { jsObj }; | |
179 boolean b = true; | |
180 | |
181 try { | |
182 if (filterExists) { | |
183 Object res = call("filter", args); | |
184 if (res instanceof Boolean) { | |
185 b = ((Boolean)res).booleanValue(); | |
186 } else if (res instanceof Number) { | |
187 b = ((Number)res).intValue() != 0; | |
188 } else { | |
189 b = (res != null); | |
190 } | |
191 } | |
192 | |
193 if (b) { | |
194 Object select = call("result", args); | |
195 visitor.visit(select); | |
196 } | |
197 } catch (Exception e) { | |
198 throw new RuntimeException(e); | |
199 } | |
200 } | |
201 | |
202 private void iterateOops(final InstanceKlass ik, final ObjectVisitor visitor, | |
203 boolean includeSubtypes) { | |
204 ObjectHeap oh = VM.getVM().getObjectHeap(); | |
205 oh.iterateObjectsOfKlass(new HeapVisitor() { | |
206 boolean filterExists; | |
207 public void prologue(long usedSize) { | |
208 filterExists = getScriptEngine().get("filter") != null; | |
209 } | |
210 public boolean doObj(Oop obj) { | |
211 dispatchObject(obj, visitor, filterExists); | |
212 return false; | |
213 } | |
214 public void epilogue() {} | |
215 }, ik, includeSubtypes); | |
216 } | |
217 | |
218 // we create fresh ObjectReader and factory to avoid | |
219 // excessive cache across queries. | |
220 private void beginQuery() { | |
221 objReader = new ObjectReader(); | |
222 factory = new JSJavaFactoryImpl(); | |
223 } | |
224 | |
225 // at the end of query we clear object reader cache | |
226 // and factory cache | |
227 private void endQuery() { | |
228 objReader = null; | |
229 factory = null; | |
230 } | |
231 | |
232 protected ObjectReader getObjectReader() { | |
233 return objReader; | |
234 } | |
235 | |
236 protected JSJavaFactory getJSJavaFactory() { | |
237 return factory; | |
238 } | |
239 | |
240 protected boolean isQuitting() { | |
241 return false; | |
242 } | |
243 | |
244 protected void quit() { | |
245 // do nothing | |
246 } | |
247 | |
248 private static void debugPrint(String msg) { | |
249 if (debug) System.out.println(msg); | |
250 } | |
251 | |
252 private static final boolean debug; | |
253 static { | |
254 debug = System.getProperty("sun.jvm.hotspot.utilities.soql.SOQLEngine.debug") != null; | |
255 } | |
256 | |
257 protected SOQLEngine() { | |
258 super(debug); | |
259 start(); | |
260 } | |
261 | |
262 private ObjectReader objReader; | |
263 private JSJavaFactory factory; | |
264 private static SOQLEngine soleInstance; | |
265 } |