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11 package org.mule.module.scripting.component;
12
13 import org.mule.DefaultMuleMessage;
14 import org.mule.api.MuleEvent;
15 import org.mule.api.MuleException;
16 import org.mule.api.MuleMessage;
17 import org.mule.api.lifecycle.InitialisationException;
18 import org.mule.api.routing.NestedRouter;
19 import org.mule.api.routing.NestedRouterCollection;
20 import org.mule.component.AbstractComponent;
21 import org.mule.routing.nested.DefaultNestedRouterCollection;
22 import org.mule.routing.nested.NestedInvocationHandler;
23 import org.mule.transformer.TransformerTemplate;
24 import org.mule.transport.NullPayload;
25 import org.mule.util.ClassUtils;
26
27 import java.lang.reflect.Proxy;
28 import java.util.Collections;
29 import java.util.HashMap;
30 import java.util.Iterator;
31 import java.util.Map;
32
33 import javax.script.Bindings;
34
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37
38
39 public class ScriptComponent extends AbstractComponent
40 {
41
42 protected NestedRouterCollection nestedRouter = new DefaultNestedRouterCollection();
43
44 private Scriptable script;
45
46 private Map proxies;
47
48
49 protected void doInitialise() throws InitialisationException
50 {
51 super.doInitialise();
52 try
53 {
54 configureComponentBindings();
55 }
56 catch (MuleException e)
57 {
58 throw new InitialisationException(e, this);
59 }
60
61 }
62
63 protected MuleMessage doOnCall(MuleEvent event) throws Exception
64 {
65
66 Bindings bindings = script.getScriptEngine().createBindings();
67 if (proxies.size() > 0)
68 {
69 bindings.putAll(proxies);
70 }
71 script.populateBindings(bindings, event);
72 Object result = script.runScript(bindings);
73
74 if (result != null)
75 {
76 if (result instanceof MuleMessage)
77 {
78 return (MuleMessage) result;
79 }
80 else
81 {
82 event.getMessage().applyTransformers(Collections.singletonList(new TransformerTemplate(
83 new TransformerTemplate.OverwitePayloadCallback(result))));
84 return event.getMessage();
85 }
86 }
87 else
88 {
89 return new DefaultMuleMessage(NullPayload.getInstance());
90 }
91 }
92
93
94 public Scriptable getScript()
95 {
96 return script;
97 }
98
99 public void setScript(Scriptable script)
100 {
101 this.script = script;
102 }
103
104 public NestedRouterCollection getNestedRouter()
105 {
106 return nestedRouter;
107 }
108
109 public void setNestedRouter(NestedRouterCollection nestedRouter)
110 {
111 this.nestedRouter = nestedRouter;
112 }
113
114 protected void configureComponentBindings() throws MuleException
115 {
116 proxies = new HashMap();
117
118
119 if (nestedRouter != null && nestedRouter.getRouters().size() > 0)
120 {
121 for (Iterator it = nestedRouter.getRouters().iterator(); it.hasNext();)
122 {
123 NestedRouter nestedRouter = (NestedRouter) it.next();
124 String bindingName = ClassUtils.getSimpleName(nestedRouter.getInterface());
125 if (proxies.containsKey(bindingName))
126 {
127 Object proxy = proxies.get(bindingName);
128 NestedInvocationHandler handler = (NestedInvocationHandler) Proxy.getInvocationHandler(proxy);
129 handler.addRouterForInterface(nestedRouter);
130 }
131 else
132 {
133 Object proxy = Proxy.newProxyInstance(getClass().getClassLoader(), new Class[]{nestedRouter.getInterface()},
134 new NestedInvocationHandler(nestedRouter));
135 proxies.put(bindingName, proxy);
136 }
137
138 }
139 }
140 }
141 }