Examples of com.sun.enterprise.config.ConfigContext

com.sun.enterprise.config.ConfigContext
A configuration context represents a heirarchical view of the configuration attributes. It reads the configuration attributes from server.xml The configuration context has a one-to-one realationship with a configuration file. There is no public constructor. Use ConfigFactory to construct ConfigContext. This object can be made readOnly and autoCommit during creation but these parameters cannot be changed once the object is created. Note that this object might be shared by number of threads. Here are some examples of code to illustrate lookup: 1. If you want to specifically locate a Node in the configuration: example: jms resource in server.xml
```
 ConfigBean conBean =  ctx.exactLookup("/server/resources/jms-resource[@name='jms1']"); 
```
Follow the syntax below for creating xpath expression for use in lookup/exactLookup. This is the only syntax supported.
```
 expression := /tagName | /tagName/tagExpression tagExpression := tagName| tagName[@name='value'] | tagName/tagExpression | tagName[@name='value']/tagExpression 
```
Config API documentation: Config API is a powerful set of APIs that handle comples operations like:
```
 1. Basic Configuration (set and get elements and attributes APIs) 2. Event Notification 3. Cloning 4. XPath support 5. Change Mananagement (add, update, delete, set) 6. readonly 7. Auto Commit 8. Advanced Configuration (1 API to access attributes--ctx.getAttribute()) 9. Intelligent refresh 10. Get dtd default values 11. DOM like API support (appendChild, removeChild) 12. Find APIs 13. Support Serialization and DeSerialization 14. Other Misc APIs (getChildBeansByName, getXPath, etc) 15. Merge APIs 
```

        if (event.getModuleType().equals(ModuleDeployEvent.TYPE_WEBMODULE)) {
            if (_logger.isLoggable(Level.FINEST)) {
                _logger.log(Level.FINEST,
                    "[WebModuleDeployEventListener] Handling event " + event.toString());
            }
            ConfigContext config = event.getOldConfigContext(); 
            String moduleName = event.getModuleName(); 


            // refreshes the config context with the context from this event
            try {
                getWebModulesManager().refreshConfigContext(config);

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                    "[WebModuleDeployEventListener] Handling event " + event.toString());
            }
            String moduleName = event.getModuleName(); 
                
            // unload from old location 
            ConfigContext oldConfig = event.getOldConfigContext();
            moduleUndeployed(oldConfig, moduleName);
               
            // load to new location
            ConfigContext config = event.getConfigContext(); 
            moduleDeployed(config, moduleName);
        }
        
    }

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        if (event.getModuleType().equals(ModuleDeployEvent.TYPE_WEBMODULE)) { 
            if (_logger.isLoggable(Level.FINEST)) {
                _logger.log(Level.FINEST,
                    "[WebModuleDeployEventListener] Handling event " + event.toString());
            }
            ConfigContext config = event.getConfigContext(); 
            String moduleName = event.getModuleName(); 


            WebModule webModule = getWebModuleAndUpdateCache(
                config, moduleName, true);

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        if (event.getModuleType().equals(ModuleDeployEvent.TYPE_WEBMODULE)) {
            if (_logger.isLoggable(Level.FINEST)) {
                _logger.log(Level.FINEST,
                    "[WebModuleDeployEventListener] Handling event " + event.toString());
            }
            ConfigContext config = event.getConfigContext(); 
            String moduleName = event.getModuleName(); 


            WebModule webModule = getWebModuleAndUpdateCache(
                config, moduleName, true);

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     * @return virtual servers as a string (separated by space or comma)
     */
    private String getVirtualServers(String appName) {
        String ret = null;
        try {
            ConfigContext ctx = 
                ApplicationServer.getServerContext().getConfigContext();
            ret = ServerBeansFactory
                    .getVirtualServersByAppName(ctx, appName);
        } catch (ConfigException ce) {
            _logger.log(Level.FINE, "Cannot get virtual server for " + appName, ce);

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  return result;
    }


    public static Cluster getCluster()
    {
  ConfigContext configCtx = null;
  String instanceName = null;
  Cluster result = null;
  try {
            if(_logger.isLoggable(Level.FINE)) {
    _logger.log(Level.FINE, ".getCluster->:");
      }
      ServerContext serverContext = ApplicationServer.getServerContext();
      if (serverContext == null) {
    if(_logger.isLoggable(Level.FINE)) {
        _logger.log(Level.FINE, ".getCluster: No ServerContext");
    }
    return null;
      }
      configCtx = serverContext.getConfigContext();
      instanceName = serverContext.getInstanceName();
      result =
          ClusterHelper.getClusterForInstance(configCtx, instanceName);
  } catch (ConfigException e) {
            if(_logger.isLoggable(Level.FINE)) {
    _logger.log(Level.FINE, 
          ".getCluster: ConfigContext: " + configCtx.toString()
          + " ; instanceName: " + instanceName
          + " ; exception: " + e);
      }
  } finally {
            if(_logger.isLoggable(Level.FINE)) {

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  context.setInstallRoot(rootDir);
  context.setInstanceName(SERVER_INSTANCE);
        try{
            String serverXml = context.getServerConfigURL();
      // Read server.xml and create a read-only configuration context
            ConfigContext cfgContext =
    ConfigFactory.createConfigContext(serverXml,
                                                  true,
                                                  false,
                                                  true);
      context.setConfigContext(cfgContext);

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        deployService = dFactory.createDeploymentService(configContext);
        return deployService;
    }


    public static DeploymentService getDeploymentService() {
        ConfigContext configContext = 
            DeploymentServiceUtils.getConfigContext();
        return DeploymentService.getDeploymentService(configContext);
    }

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        Server serverBean = null;
        /*
        ServerContext serverCtx = ApplicationServer.getServerContext();
        ConfigContext configCtx = serverCtx.getConfigContext();
         */
        ConfigContext configCtx = this.getConfigContext();
        try {
            serverBean = ServerBeansFactory.getServerBean(configCtx);
        } catch (ConfigException ex) {}


        return serverBean;

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    * determine if this instance is the DAS
    */    
    public boolean isDAS() {
        boolean result = true;
        Server serverBean = this.getServerBean();
        ConfigContext configCtx = this.getConfigContext();
        if(serverBean != null && configCtx != null) {
            try {
                result = ServerHelper.isDAS(configCtx, serverBean);
            } catch (ConfigException ex) {}
        }

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