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1 package org.enhydra.shark.toolagent;
2
3 import java.lang.reflect.*;
4
5 import org.enhydra.shark.api.*;
6 import org.enhydra.shark.api.internal.toolagent.*;
7
8
13 public class JavaClassToolAgent extends AbstractToolAgent {
14
15 private static final String  EXECUTION_METHOD_NAME = "execute";
16
17 public void invokeApplication (SharkTransaction t,
18 long handle,
19 String applicationName,
20 String procInstId,
21 String assId,
22 AppParameter[] parameters,
23 Integer appMode)
24 throws ApplicationNotStarted, ApplicationNotDefined,
25 ApplicationBusy, ToolAgentGeneralException {
26
27 super.invokeApplication(t,handle,applicationName,procInstId,assId,parameters,appMode);
28
29 try {
30 status=APP_STATUS_RUNNING;
31
32 if (appName==null || appName.trim().length()==0) {
33 readParamsFromExtAttributes((String )parameters[0].the_value);
34 }
35
36 ClassLoader cl=getClass().getClassLoader();
37 Class c = cl.loadClass(appName);
38
39 Class [] parameterTypes=null;
41 if (parameters!=null) {
42 parameterTypes=new Class [parameters.length-1];
43 for (int i=1; i<parameters.length; i++) {
44 parameterTypes[i-1]=AppParameter.class;
45 }
46 }
47
48 Method m = c.getMethod(EXECUTION_METHOD_NAME,parameterTypes);
49
50 AppParameter[] aps=new AppParameter[parameters.length-1];
52 System.arraycopy(parameters,1,aps,0,aps.length);
53 m.invoke(null,aps);
54 status=APP_STATUS_FINISHED;
55
56 } catch (ClassNotFoundException cnf) {
57 cus.error("JavaClassToolAgent - application "+appName+" terminated incorrectly, can't find class: "+cnf);
58 throw new ApplicationNotDefined("Can't find class "+appName,cnf);
59 } catch (NoSuchMethodException nsm) {
60 cus.error("JavaClassToolAgent - application "+appName+" terminated incorrectly, can't find method "+EXECUTION_METHOD_NAME+" : "+nsm);
61 throw new ApplicationNotDefined("Class "+appName+" doesn't have method "+EXECUTION_METHOD_NAME,nsm);
62 } catch (NoClassDefFoundError ncdfe) {
63 cus.error("JavaClassToolAgent - application "+appName+" terminated incorrectly, can't find class definition: "+ncdfe);
64 throw new ApplicationNotDefined("Class "+appName+" can't be executed",ncdfe);
65 } catch (Throwable ex) {
66 cus.error("JavaClassToolAgent - application "+appName+" terminated incorrectly: "+ex);
67 status=APP_STATUS_INVALID;
68 throw new ToolAgentGeneralException(ex);
69 }
70 }
71
72 public String getInfo (SharkTransaction t) throws ToolAgentGeneralException {
73 String i="This tool agent executes Java classes, by calling its static method called \"execute\"."+
74 "\nWhen calling this tool agent's invokeApplication() method, the application "+
75 "\nname parameter should be the full name of the class that should be executed "+
76 "\nby this tool agent (the classes had to be in the class path) "+
77 "\n"+
78 "\nThis tool agent is able to understand the extended attribute with the following name:"+
79 "\n * AppName - value of this attribute should represent the class name to be executed"+
80 "\n"+
81 "\n NOTE: Tool agent will read extended attributes only if they are called through"+
82 "\n Default tool agent (not by shark directly) and this is the case when information "+
83 "\n on which tool agent to start for XPDL application definition is not contained in mappings";
84 return i;
85 }
86 }
87 |
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