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1   /*
2    * $Id: ConfigurableTransportFactory.java 20321 2010-11-24 15:21:24Z dfeist $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  package org.mule.config.endpoint;
11  
12  import org.mule.api.DefaultMuleException;
13  import org.mule.api.MuleContext;
14  import org.mule.api.MuleException;
15  import org.mule.api.endpoint.EndpointURI;
16  import org.mule.api.transport.Connector;
17  import org.mule.transport.service.TransportFactory;
18  import org.mule.transport.service.TransportFactoryException;
19  import org.mule.util.BeanUtils;
20  import org.mule.util.ClassUtils;
21  import org.mule.util.PropertiesUtils;
22  
23  import java.io.IOException;
24  import java.net.URL;
25  import java.util.Enumeration;
26  import java.util.Map;
27  import java.util.Properties;
28  
29  /**
30   * TODO
31   */
32  public class ConfigurableTransportFactory extends TransportFactory
33  {
34      public static final String CHANNEL_OVERRIDES = "_configuredConnectorOverrides";
35      public static final String CHANNEL_OVERRIDES_FILE = "META-INF/services/org/mule/config/channel-overrides.properties";
36      public static final String SINGLETON_PROPERTY = "singleton";
37      public static final String TRUE = "TRUE";
38  
39      private Properties overrides;
40  
41      public ConfigurableTransportFactory(MuleContext muleContext) throws MuleException
42      {
43          super(muleContext);
44          overrides = (Properties) muleContext.getRegistry().lookupObject(CHANNEL_OVERRIDES);
45          if (overrides == null)
46          {
47              overrides = loadOverrides();
48              muleContext.getRegistry().registerObject(CHANNEL_OVERRIDES, overrides);
49          }
50      }
51  
52      @Override
53      public Connector createConnector(EndpointURI endpointURI) throws TransportFactoryException
54      {
55          Connector c;
56          String scheme = endpointURI.getScheme();
57          Map temp = new Properties();
58          PropertiesUtils.getPropertiesWithPrefix(overrides, scheme, temp);
59          temp = PropertiesUtils.removeNamespaces(temp);
60          String singleton = (String) temp.remove(SINGLETON_PROPERTY);
61          if (TRUE.equalsIgnoreCase(singleton))
62          {
63              c = this.getConnectorByProtocol(scheme);
64              if (c != null)
65              {
66                  return c;
67              }
68          }
69          c = super.createConnector(endpointURI);
70          BeanUtils.populateWithoutFail(c, temp, true);
71          return c;
72      }
73  
74      protected Properties loadOverrides() throws MuleException
75      {
76          Properties props = new Properties();
77          Enumeration e = ClassUtils.getResources(CHANNEL_OVERRIDES_FILE, getClass());
78          while (e.hasMoreElements())
79          {
80              URL url = (URL) e.nextElement();
81              try
82              {
83                  props.load(url.openStream());
84              }
85              catch (IOException e1)
86              {
87                  throw new DefaultMuleException("failed to read channel overrides from URL: " + url.toExternalForm());
88              }
89          }
90          return props;
91      }
92  }