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1 package org.enhydra.shark.toolagent;
2
3 import java.io.BufferedReader  ;
4 import java.io.IOException ;
5 import java.io.InputStream ;
6 import java.io.InputStreamReader ;
7 import java.io.Reader ;
8 import java.io.StringReader ;
9 import java.net.URL ;
10
11 import org.enhydra.shark.api.SharkTransaction;
12 import org.enhydra.shark.api.internal.toolagent.AppParameter;
13 import org.enhydra.shark.api.internal.toolagent.ApplicationBusy;
14 import org.enhydra.shark.api.internal.toolagent.ApplicationNotDefined;
15 import org.enhydra.shark.api.internal.toolagent.ApplicationNotStarted;
16 import org.enhydra.shark.api.internal.toolagent.ToolAgentGeneralException;
17 import org.enhydra.shark.xpdl.XPDLConstants;
18 import org.enhydra.shark.xpdl.elements.ExtendedAttribute;
19 import org.enhydra.shark.xpdl.elements.ExtendedAttributes;
20 import org.mozilla.javascript.Context;
21 import org.mozilla.javascript.Scriptable;
22
23
30 public class JavaScriptToolAgent extends AbstractToolAgent {
31
32 public static final long APP_MODE_FILE=0;
33 public static final long APP_MODE_TEXT=1;
34
35 public static final String SCRIPT_EXT_ATTR_NAME="Script";
36
37 private String script;
38
39 public void invokeApplication (SharkTransaction t,
40 long handle,
41 String applicationName,
42 String procInstId,
43 String assId,
44 AppParameter[] parameters,
45 Integer appMode)
46 throws ApplicationNotStarted, ApplicationNotDefined,
47 ApplicationBusy, ToolAgentGeneralException {
48
49 super.invokeApplication(t,handle,applicationName,procInstId,assId,parameters,appMode);
50
51 try {
52 status=APP_STATUS_RUNNING;
53
54 if (appName==null || appName.trim().length()==0) {
55 readParamsFromExtAttributes((String )parameters[0].the_value);
56 }
57 if (script==null) {
58 if (appMode!=null && appMode.intValue()==APP_MODE_FILE) {
59 script=readScriptFromFile(appName);
60 } else {
61 script=appName;
62 }
63 }
64
65 org.mozilla.javascript.Context cx = org.mozilla.javascript.Context.enter();
66 Scriptable scope = prepareContext (t, cx,parameters);
67 Reader sr = new StringReader (script);
68 cx.evaluateReader (scope, sr, "<script>", 1, null);
70 prepareResult(parameters,scope);
71
72 status=APP_STATUS_FINISHED;
73 } catch (IOException ioe) {
74 cus.error("JavaScriptToolAgent - application "+appName+" terminated incorrectly, can't find script file: "+ioe);
75 throw new ApplicationNotDefined("Can't find script file "+appName,ioe);
76 } catch (Throwable ex) {
77 cus.error("JavaScriptToolAgent - application "+appName+" terminated incorrectly: "+ex);
78 status=APP_STATUS_INVALID;
80 throw new ToolAgentGeneralException(ex);
81 } finally {
82 Context.exit();
83 }
84
85 }
86
87 public String getInfo (SharkTransaction t) throws ToolAgentGeneralException {
88 String i="Executes scripts written in Java script syntax." +
89 "\nIf you set application mode to 0 (zero), tool agent will search for a script "+
90 "\nfile given as applicationName parameter (this file has to be in the class path),"+
91 "\nand if it founds it, it will try to execute it. Otherwise, it will consider "+
92 "applicationName parameter to be the script itself, and will try to execute it."+
93 "\n"+
94 "\nThis tool agent is able to understand the extended attributes with the following names:"+
95 "\n * AppName - value of this attribute should represent the name of script file to "+
96 "\n execute (this file has to be in class path)"+
97 "\n * Script - the value of this represents the script to be executed. I.e. this"+
98 "\n extended attribute in XPDL can be defined as follows:"+
99 "\n <ExtendedAttribute Name=\"Script\" Value=\"c=a-b;\"/>"+
100 "\n (a, b and c in above text are Formal parameter Ids from XPDL Application definition)"+
101 "\n"+
102 "\n NOTE: Tool agent will read extended attributes only if they are called through"+
103 "\n Default tool agent (not by shark directly) and this is the case when information "+
104 "\n on which tool agent to start for XPDL application definition is not contained in mappings";
105 return i;
106 }
107
108 private Scriptable prepareContext (SharkTransaction t, org.mozilla.javascript.Context cx,AppParameter[] context) {
109 Scriptable scope = cx.initStandardObjects(null);
110 if (context!=null) {
111 for (int i=1; i<context.length; i++) {
113 String key = context[i].the_formal_name;
114 java.lang.Object value = context[i].the_value;
115 if (key.equals("assId")||key.equals("procInstId")||key.equals("sharkTransaction")) {
118 cus.warn("Process \""+this.procInstId+"\", activity \""+this.assId+"\" variable conflict");
119 }
120 scope.put(key,scope,value);
121 }
122 }
123 scope.put("assId", scope ,this.assId);
124 scope.put("procInstId", scope, this.procInstId);
125 scope.put("sharkTransaction", scope, t);
126 return scope;
127 }
128
129 private void prepareResult (AppParameter[] context,Scriptable scope) {
130 if (context!=null) {
131 for (int i = 0; i < context.length; i++) {
132 if(context[i].the_mode.equals(XPDLConstants.FORMAL_PARAMETER_MODE_OUT) || context[i].the_mode.equals(XPDLConstants.FORMAL_PARAMETER_MODE_INOUT)) {
133 java.lang.Object val = scope.get(context[i].the_formal_name,scope);
134
150 context[i].the_value=Context.toType(val,context[i].the_class);
151
153 }
154 }
155 }
156 }
157
158 private static String readScriptFromFile (String filename) throws IOException {
159 String script=null;
160 Reader rdr=null;
161 InputStream in = null;
162 URL url = null;
163 ClassLoader cl = JavaScriptToolAgent.class.getClassLoader();
164 url = cl.getResource(filename);
165 if (url != null) {
166 try {
167 in = url.openStream();
168 } catch (IOException e) {
169 }
170 }
171 if (in != null) {
172 rdr=new InputStreamReader (in);
173 }
174
175 if (rdr != null) {
176 try {
177 BufferedReader brdr = new BufferedReader (rdr);
178 StringBuffer sb = new StringBuffer ();
179 String line;
180 while ((line = brdr.readLine()) != null) {
181 sb.append(line);
182 sb.append('\n');
183 }
184 script = sb.toString();
185 } finally {
186 rdr.close();
187 }
188 }
189 return script;
190 }
191
192 protected ExtendedAttributes readParamsFromExtAttributes (String extAttribs) throws Exception {
193 ExtendedAttributes eas=super.readParamsFromExtAttributes(extAttribs);
194 if (appName==null || appName.trim().length()==0) {
195 ExtendedAttribute ea=eas.getFirstExtendedAttributeForName(JavaScriptToolAgent.SCRIPT_EXT_ATTR_NAME);
196 if (ea!=null) {
197 script=ea.getVValue();
198 }
199 }
200
201 return eas;
202 }
203
204 }
205 |
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