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).
    */
   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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    public void startServer() throws Exception {
        embedded = new Embedded();
        String path = new File(".").getAbsolutePath();
        embedded.setCatalinaHome(path);


        Engine engine = embedded.createEngine();
        engine.setDefaultHost("127.0.0.1");


        Host host = embedded.createHost("127.0.0.1", path);
        engine.addChild(host);


        Context c = embedded.createContext("/", path);
        c.setReloadable(false);
        Wrapper w = c.createWrapper();
        w.addMapping("/*");

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        urlTarget = "http://127.0.0.1:" + port + "/invoke";
        embedded = new Embedded();
        String path = new File(".").getAbsolutePath();
        embedded.setCatalinaHome(path);


        Engine engine = embedded.createEngine();
        engine.setDefaultHost("127.0.0.1");


        Host host = embedded.createHost("127.0.0.1", path);
        engine.addChild(host);


        Context c = embedded.createContext("/", path);
        c.setReloadable(false);
        Wrapper w = c.createWrapper();
        w.addMapping("/*");

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        if( log.isDebugEnabled() )
            log.debug("Adding engine (" + engine.getInfo() + ")");


        // Add this Engine to our set of defined Engines
        Engine results[] = new Engine[engines.length + 1];
        for (int i = 0; i < engines.length; i++)
            results[i] = engines[i];
        results[engines.length] = engine;
        engines = results;

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        // Remove this Engine from our set of defined Engines
        if( log.isDebugEnabled() )
            log.debug(" Removing this Engine");
        int k = 0;
        Engine results[] = new Engine[engines.length - 1];
        for (int i = 0; i < engines.length; i++) {
            if (i != j)
                results[k++] = engines[i];
        }
        engines = results;

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                        + " for changes.");
        } //end if


        // Check to correct engine and host setup
        host = (Host) getCluster().getContainer();
        Engine engine = (Engine) host.getParent();
        try {
            oname = new ObjectName(engine.getName() + ":type=Deployer,host="
                    + host.getName());
        } catch (Exception e) {
            log.error("Can't construct MBean object name" + e);
        }
        configBase = new File(System.getProperty("catalina.base"), "conf");
        if (engine != null) {
            configBase = new File(configBase, engine.getName());
        }
        if (host != null) {
            configBase = new File(configBase, host.getName());
        }

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        initialized=true;        
        
        if( oname==null ) {
            try {
                StandardContext ctx=(StandardContext)this.getContainer();
                Engine eng=(Engine)ctx.getParent().getParent();
                domain=ctx.getEngineName();
                StandardHost hst=(StandardHost)ctx.getParent();
                String path = ctx.getPath();
                if (path.equals("")) {
                    path = "/";

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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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        Container econtainer = host.getParent();
        if(econtainer == null && econtainer instanceof Engine) {
            log.error("FarmWarDeployer can only work if parent of " + host.getName()+ " is an engine!"); 
            return ;
        }
        Engine engine = (Engine) econtainer;
        String hostname = null;
        hostname = host.getName();
        try {
            oname = new ObjectName(engine.getName() + ":type=Deployer,host="
                    + hostname);
        } catch (Exception e) {
            log.error("Can't construct MBean object name" + e);
            return;
        }
        if (watchEnabled) {
            watcher = new WarWatcher(this, new File(getWatchDir()));
            if (log.isInfoEnabled()) {
                log.info("Cluster deployment is watching " + getWatchDir()
                          + " for changes.");
            }
        }
         
        configBase = new File(System.getProperty("catalina.base"), "conf");
        if (engine != null) {
            configBase = new File(configBase, engine.getName());
        } 
        if (host != null) {
            configBase = new File(configBase, hostname);
        }

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