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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.module.scripting.component;
8   
9   import org.mule.api.MuleEvent;
10  import org.mule.api.MuleException;
11  import org.mule.api.component.InterfaceBinding;
12  import org.mule.api.lifecycle.InitialisationException;
13  import org.mule.component.AbstractComponent;
14  import org.mule.component.BindingInvocationHandler;
15  import org.mule.util.ClassUtils;
16  
17  import java.lang.reflect.Proxy;
18  import java.util.ArrayList;
19  import java.util.HashMap;
20  import java.util.Iterator;
21  import java.util.List;
22  import java.util.Map;
23  
24  import javax.script.Bindings;
25  
26  /**
27   * A Script service backed by a JSR-223 compliant script engine such as
28   * Groovy, JavaScript, or Rhino.
29   */
30  public class ScriptComponent extends AbstractComponent
31  {
32      protected List<InterfaceBinding> bindings = new ArrayList<InterfaceBinding>();
33  
34      private Scriptable script;
35  
36      private Map<String, Object> proxies;
37  
38      @Override
39      protected void doInitialise() throws InitialisationException
40      {
41          script.setMuleContext(muleContext);
42          super.doInitialise();
43          try
44          {
45              configureComponentBindings();
46          }
47          catch (MuleException e)
48          {
49              throw new InitialisationException(e, this);
50          }
51      }
52  
53      @Override
54      protected Object doInvoke(MuleEvent event) throws Exception
55      {
56          // Set up initial script variables.
57          Bindings bindings = script.getScriptEngine().createBindings();
58          if (proxies.size() > 0)
59          {
60              bindings.putAll(proxies);
61          }
62          script.populateBindings(bindings, event);
63          try
64          {
65              return script.runScript(bindings);
66          }
67          catch (Exception e)
68          {
69              // leave this catch block in place to help debug classloading issues
70              throw e;
71          } finally {
72              bindings.clear();
73          }
74      }
75  
76      public Scriptable getScript()
77      {
78          return script;
79      }
80  
81      public void setScript(Scriptable script)
82      {
83          this.script = script;
84      }
85  
86      public List<InterfaceBinding> getInterfaceBindings()
87      {
88          return bindings;
89      }
90  
91      public void setInterfaceBindings(List<InterfaceBinding> bindingCollection)
92      {
93          this.bindings = bindingCollection;
94      }
95  
96      protected void configureComponentBindings() throws MuleException
97      {
98          proxies = new HashMap<String, Object>();
99          // Initialise the nested router and bind the endpoints to the methods using a
100         // Proxy
101         if (bindings != null && bindings.size() > 0)
102         {
103             for (Iterator<?> it = bindings.iterator(); it.hasNext();)
104             {
105                 InterfaceBinding interfaceBinding = (InterfaceBinding) it.next();
106                 String bindingName = ClassUtils.getSimpleName(interfaceBinding.getInterface());
107                 if (proxies.containsKey(bindingName))
108                 {
109                     Object proxy = proxies.get(bindingName);
110                     BindingInvocationHandler handler = (BindingInvocationHandler) Proxy.getInvocationHandler(proxy);
111                     handler.addRouterForInterface(interfaceBinding);
112                 }
113                 else
114                 {
115                     Object proxy = Proxy.newProxyInstance(muleContext.getExecutionClassLoader(),
116                         new Class[]{interfaceBinding.getInterface()}, 
117                         new BindingInvocationHandler(interfaceBinding));
118                     proxies.put(bindingName, proxy);
119                 }
120             }
121         }
122     }
123 }