Examples of org.apache.catalina.Host

org.apache.catalina.Host
A Host is a Container that represents a virtual host in the Catalina servlet engine. It is useful in the following types of scenarios:
- You wish to use Interceptors that see every single request processed by this particular virtual host.
- 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 a Host 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 parent Container attached to a Host is generally an Engine, but may be some other implementation, or may be omitted if it is not necessary.
The child containers attached to a Host are generally implementations of Context (representing an individual servlet context). @author Craig R. McClanahan @version $Id: Host.java 1060467 2011-01-18 17:01:07Z markt $

     * Adjust docBase.
     */
    protected void fixDocBase()
        throws IOException {


        Host host = (Host) context.getParent();
        File appBase = host.getAppBaseFile();


        String docBase = context.getDocBase();
        if (docBase == null) {
            // Trying to guess the docBase according to the path
            String path = context.getPath();

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    protected void antiLocking() {


        if ((context instanceof StandardContext)
            && ((StandardContext) context).getAntiResourceLocking()) {


            Host host = (Host) context.getParent();
            String docBase = context.getDocBase();
            if (docBase == null) {
                return;
            }
            originalDocBase = docBase;


            File docBaseFile = new File(docBase);
            if (!docBaseFile.isAbsolute()) {
                docBaseFile = new File(host.getAppBaseFile(), docBase);
            }


            String path = context.getPath();
            if (path == null) {
                return;

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    private WebXml getDefaultWebXmlFragment() {


        // Host should never be null
        Host host = (Host) context.getParent();


        DefaultWebXmlCacheEntry entry = hostWebXmlCache.get(host);


        InputSource globalWebXml = getGlobalWebXmlSource();
        InputSource hostWebXml = getHostWebXmlSource();


        long globalTimeStamp = 0;
        long hostTimeStamp = 0;


        if (globalWebXml != null) {
            try {
                URL url = new URL(globalWebXml.getSystemId());
                globalTimeStamp = url.openConnection().getLastModified();
            } catch (MalformedURLException e) {
                globalTimeStamp = -1;
            } catch (IOException e) {
                globalTimeStamp = -1;
            }
        }


        if (hostWebXml != null) {
            try {
                URL url = new URL(hostWebXml.getSystemId());
                hostTimeStamp = url.openConnection().getLastModified();
            } catch (MalformedURLException e) {
                hostTimeStamp = -1;
            } catch (IOException e) {
                hostTimeStamp = -1;
            }
        }


        if (entry != null && entry.getGlobalTimeStamp() == globalTimeStamp &&
                entry.getHostTimeStamp() == hostTimeStamp) {
            return entry.getWebXml();
        }


        // Parsing global web.xml is relatively expensive. Use a sync block to
        // make sure it only happens once. Use the pipeline since a lock will
        // already be held on the host by another thread
        synchronized (host.getPipeline()) {
            entry = hostWebXmlCache.get(host);
            if (entry != null && entry.getGlobalTimeStamp() == globalTimeStamp &&
                    entry.getHostTimeStamp() == hostTimeStamp) {
                return entry.getWebXml();
            }

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        if ((uri == null) || (!uri.startsWith("/")))
            return (null);


        Context child = null;
        try {
            Host host = (Host) context.getParent();
            String mapuri = uri;
            while (true) {
                child = (Context) host.findChild(mapuri);
                if (child != null)
                    break;
                int slash = mapuri.lastIndexOf('/');
                if (slash < 0)
                    break;

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            // has been deployed
            if (request.getContext() == null) {
                res.setStatus(404);
                res.setMessage("Not found");
                // No context, so use host
                Host host = request.getHost();
                // Make sure there is a host (might not be during shutdown)
                if (host != null) {
                    host.logAccess(request, response, 0, true);
                }
                return false;
            }


            // Now we have the context, we can parse the session ID from the URL

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            engine.setCluster((Cluster)clusterGBean.getInternalObject());
        }
    }


    private void removeHost(ObjectRetriever objRetriever) {
        Host host = (Host)objRetriever.getInternalObject();
        engine.removeChild(host);
    }

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        Host host = (Host)objRetriever.getInternalObject();
        engine.removeChild(host);
    }


    private void addHost(ObjectRetriever objRetriever) {
        Host host = (Host)objRetriever.getInternalObject();


        //If we didn't set a realm, then use the default
        if (host.getRealm() == null) {
            host.setRealm(engine.getRealm());
        }
        engine.addChild(host);
    }

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    throws IOException {
        synchronized (connection.getConnector()) {


        Container container=connection.getConnector().getContainer();


        Host host=(Host)container.findChild(hostName);
        if (host==null) {
            WarpHost whost=new WarpHost();
            whost.setName(hostName);
            whost.setParent(container);
            whost.setAppBase(connection.getConnector().getAppBase());
            whost.setDebug(connection.getConnector().getDebug());
            container.addChild(whost);
            host=whost;
            if (Constants.DEBUG)
                logger.debug("Created new host "+host.getName());
        } else if (Constants.DEBUG) {
            logger.debug("Reusing instance of Host \""+host.getName()+"\"");
        }


        // TODO: Set up mapping mechanism for performance


        if (applPath.endsWith("/"))
            applPath=applPath.substring(0,applPath.length()-1);


        Context appl=(Context)host.findChild(applPath);


        if (appl==null) {


            if (Constants.DEBUG)
                logger.debug("No application for \""+applPath+"\"");


            Deployer deployer=(Deployer)host;
            File file=new File(host.getAppBase()+File.separator+applName);
            if (!file.isAbsolute()) {
                file=new File(System.getProperty("catalina.base"),
                              host.getAppBase()+File.separator+applName);
            }


            if (!file.exists()) {
                logger.log("Cannot find \""+file.getPath()+"\" for appl. \""+
                           applName+"\" host \""+host.getName()+"\"");
                return(null);
            }


            String path=file.getCanonicalPath();
            URL url=new URL("file",null,path);

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            engine.setCluster((Cluster)clusterGBean.getInternalObject());
        }
    }


    private void removeHost(ObjectRetriever objRetriever) {
        Host host = (Host)objRetriever.getInternalObject();
        engine.removeChild(host);
    }

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        Host host = (Host)objRetriever.getInternalObject();
        engine.removeChild(host);
    }


    private void addHost(ObjectRetriever objRetriever) {
        Host host = (Host)objRetriever.getInternalObject();


        //If we didn't set a realm, then use the default
        if (host.getRealm() == null) {
            host.setRealm(engine.getRealm());
        }
        engine.addChild(host);
    }

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