Examples of org.apache.catalina.Engine

org.apache.catalina.Engine
An Engine is a Container that represents the entire Catalina servlet engine. It is useful in the following types of scenarios:
- You wish to use Interceptors that see every single request processed by the entire engine.
- You wish to run Catalina in with a standalone HTTP connector, but still want support for multiple virtual hosts.
In general, you would not use an Engine when deploying Catalina connected to a web server (such as Apache), because the Connector will have utilized the web server's facilities to determine which Context (or perhaps even which Wrapper) should be utilized to process this request.
The child containers attached to an Engine are generally implementations of Host (representing a virtual host) or Context (representing individual an individual servlet context), depending upon the Engine implementation.
If used, an Engine is always the top level Container in a Catalina hierarchy. Therefore, the implementation's setParent() method should throw IllegalArgumentException. @author Craig R. McClanahan @version $Revision: 466595 $ $Date: 2006-10-21 23:24:41 +0100 (Sat, 21 Oct 2006) $

    *
    * @return an Engine object (or null).
    */
   private Engine getEngine()
   {
      Engine e = null;
      for (Container c = getContainer(); e == null && c != null; c = c.getParent())
      {
         if (c != null && c instanceof Engine)
         {
            e = (Engine) c;

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        if (container instanceof Engine) {
            Service service = ((Engine)container).getService();
            name = new ObjectName(domain + ":type=Manager,service=" +
                              service.getName());
        } else if (container instanceof Host) {
            Engine engine = (Engine) container.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=Manager,host=" +
                              container.getName() + ",service=" +
                              service.getName());
        } else if (container instanceof Context) {
            String path = ((Context)container).getPath();
            if (path.length() < 1) {
                path = "/";
            }
            Host host = (Host) container.getParent();
            Engine engine = (Engine) host.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=Manager,path=" + path +
                              ",host=" + host.getName() + ",service=" +
                              service.getName());
        } else if (container == null) {
            DefaultContext defaultContext = manager.getDefaultContext();
            if (defaultContext != null) {
                Container parent = defaultContext.getParent();
                if (parent instanceof Engine) {
                    Service service = ((Engine)parent).getService();
                    name = new ObjectName(domain + ":type=DefaultManager,service=" +
                            service.getName());
                } else if (parent instanceof Host) {
                    Engine engine = (Engine) parent.getParent();
                    Service service = engine.getService();
                    name = new ObjectName(domain + ":type=DefaultManager,host=" +
                            parent.getName() + ",service=" + service.getName());
                }
            }
        }

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        } else if (container instanceof Context) {        
            String path = ((Context)container).getPath();
            if (path.length() < 1)
                path = "/";
            Host host = (Host) ((Context)container).getParent();
            Engine engine = (Engine) host.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=NamingResources" + 
                        ",resourcetype=Context,path=" + path + 
                        ",host=" + host.getName() +
                        ",service=" + service.getName());
        } else if (container instanceof DefaultContext) {
            container = ((DefaultContext)container).getParent();
            if (container instanceof Host) {
                Host host = (Host) container;
                Service service = ((Engine)host.getParent()).getService();
                name = new ObjectName(domain + ":type=NamingResources" + 
                        ",resourcetype=HostDefaultContext,host=" + host.getName() +
                        ",service=" + service.getName());
            } else if (container instanceof Engine) {
                Engine engine = (Engine) container;
                Service service = engine.getService();
                name = new ObjectName(domain + ":type=NamingResources" + 
                        ",resourcetype=ServiceDefaultContext" +
                        ",service=" + service.getName());
            }
        }

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        if (container instanceof Engine) {
            Service service = ((Engine)container).getService();
            name = new ObjectName(domain + ":type=Realm,service=" +
                              service.getName());
        } else if (container instanceof Host) {
            Engine engine = (Engine) container.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=Realm,host=" +
                              container.getName() + ",service=" +
                              service.getName());
        } else if (container instanceof Context) {
            String path = ((Context)container).getPath();
            if (path.length() < 1) {
                path = "/";
            }
            Host host = (Host) container.getParent();
            Engine engine = (Engine) host.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=Realm,path=" + path +
                              ",host=" + host.getName() + ",service=" +
                              service.getName());
        }

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     * Retrieve the enclosing Engine for this Manager.
     *
     * @return an Engine object (or null).
     */
    public Engine getEngine() {
        Engine e = null;
        for (Container c = getContainer(); e == null && c != null ; c = c.getParent()) {
            if (c != null && c instanceof Engine) {
                e = (Engine)c;
            }
        }

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    /**
     * Retrieve the JvmRoute for the enclosing Engine.
     * @return the JvmRoute or null.
     */
    public String getJvmRoute() {
        Engine e = getEngine();
        return e == null ? null : e.getJvmRoute();
    }

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        } else if (container instanceof Context) {        
            String path = ((Context)container).getPath();
            if (path.length() < 1)
                path = "/";
            Host host = (Host) ((Context)container).getParent();
            Engine engine = (Engine) host.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=Environment" + 
                        ",resourcetype=Context,path=" + path + 
                        ",host=" + host.getName() +
                        ",service=" + service.getName() +
                        ",name=" + environment.getName());
        } else if (container instanceof DefaultContext) {
            container = ((DefaultContext)container).getParent();
            if (container instanceof Host) {
                Host host = (Host) container;
                Service service = ((Engine)host.getParent()).getService();
                name = new ObjectName(domain + ":type=Environment" + 
                        ",resourcetype=HostDefaultContext,host=" + host.getName() +
                        ",service=" + service.getName() +
                        ",name=" + environment.getName());
            } else if (container instanceof Engine) {
                Engine engine = (Engine) container;
                Service service = engine.getService();
                name = new ObjectName(domain + ":type=Environment" + 
                        ",resourcetype=ServiceDefaultContext,service=" + 
                        service.getName() + ",name=" + environment.getName());
            }
        }

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        } else if (container instanceof Context) {                    
            String path = ((Context)container).getPath();
            if (path.length() < 1)
                path = "/";
            Host host = (Host) ((Context)container).getParent();
            Engine engine = (Engine) host.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=Resource" +
                        ",resourcetype=Context,path=" + path + 
                        ",host=" + host.getName() +
                        ",service=" + service.getName() +
                        ",class=" + resource.getType() + 
                        ",name=" + encodedResourceName);
        } else if (container instanceof DefaultContext) {            
            container = ((DefaultContext)container).getParent();
            if (container instanceof Host) {
                Host host = (Host) container;
                Service service = ((Engine)host.getParent()).getService();
                name = new ObjectName(domain + ":type=Resource" + 
                        ",resourcetype=HostDefaultContext,host=" + host.getName() +
                        ",service=" + service.getName() +
                        ",class=" + resource.getType() + 
                        ",name=" + encodedResourceName);
            } else if (container instanceof Engine) {
                Engine engine = (Engine) container;
                Service service = engine.getService();
                name = new ObjectName(domain + ":type=Resource" + 
                        ",resourcetype=ServiceDefaultContext,service=" + service.getName() +
                        ",class=" + resource.getType() + 
                        ",name=" + encodedResourceName);
            }

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        } else if (container instanceof Context) {                    
            String path = ((Context)container).getPath();
            if (path.length() < 1)
                path = "/";
            Host host = (Host) ((Context)container).getParent();
            Engine engine = (Engine) host.getParent();
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=ResourceLink" +
                        ",resourcetype=Context,path=" + path + 
                        ",host=" + host.getName() +
                        ",service=" + service.getName() +
                        ",name=" + encodedResourceLinkName);
        } else if (container instanceof DefaultContext) {            
            container = ((DefaultContext)container).getParent();
            if (container instanceof Host) {
                Host host = (Host) container;
                Service service = ((Engine)host.getParent()).getService();
                name = new ObjectName(domain + ":type=ResourceLink" + 
                        ",resourcetype=HostDefaultContext,host=" + host.getName() +
                        ",service=" + service.getName() +
                        ",name=" + encodedResourceLinkName);
            } else if (container instanceof Engine) {
                Engine engine = (Engine) container;
                Service service = engine.getService();
                name = new ObjectName(domain + ":type=ResourceLink" + 
                        ",resourcetype=ServiceDefaultContext,service=" + service.getName() +
                        ",name=" + encodedResourceLinkName);
            }
        }

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            Service service = ((Engine)host.getParent()).getService();
            name = new ObjectName(domain + ":type=DefaultContext,host=" +
                              host.getName() + ",service=" +
                              service.getName());
        } else if (container instanceof Engine) {
            Engine engine = (Engine) container;
            Service service = engine.getService();
            name = new ObjectName(domain + ":type=DefaultContext,service=" +
                              service.getName());
        }


        return (name);

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