jspruntimecontext.java

业界著名的tomcat服务器的最新6.0的源代码。

    public URLClassLoader getParentClassLoader() {
        return parentClassLoader;
    }

    /**
     * Get the SecurityManager PermissionCollection for this
     * web application context.
     *
     * @return PermissionCollection permissions
     */
    public PermissionCollection getPermissionCollection() {
        return permissionCollection;
    }

    /**
     * Process a "destory" event for this web application context.
     */                                                        
    public void destroy() {
        Iterator servlets = jsps.values().iterator();
        while (servlets.hasNext()) {
            ((JspServletWrapper) servlets.next()).destroy();
        }
    }

    /**
     * Increments the JSP reload counter.
     */
    public synchronized void incrementJspReloadCount() {
        jspReloadCount++;
    }

    /**
     * Resets the JSP reload counter.
     *
     * @param count Value to which to reset the JSP reload counter
     */
    public synchronized void setJspReloadCount(int count) {
        this.jspReloadCount = count;
    }

    /**
     * Gets the current value of the JSP reload counter.
     *
     * @return The current value of the JSP reload counter
     */
    public int getJspReloadCount() {
        return jspReloadCount;
    }


    /**
     * Method used by background thread to check the JSP dependencies
     * registered with this class for JSP's.
     */
    public void checkCompile() {

        if (lastCheck < 0) {
            // Checking was disabled
            return;
        }
        long now = System.currentTimeMillis();
        if (now > (lastCheck + (options.getCheckInterval() * 1000L))) {
            lastCheck = now;
        } else {
            return;
        }
        
        Object [] wrappers = jsps.values().toArray();
        for (int i = 0; i < wrappers.length; i++ ) {
            JspServletWrapper jsw = (JspServletWrapper)wrappers[i];
            JspCompilationContext ctxt = jsw.getJspEngineContext();
            // JspServletWrapper also synchronizes on this when
            // it detects it has to do a reload
            synchronized(jsw) {
                try {
                    ctxt.compile();
                } catch (FileNotFoundException ex) {
                    ctxt.incrementRemoved();
                } catch (Throwable t) {
                    jsw.getServletContext().log("Background compile failed",
						t);
                }
            }
        }

    }

    /**
     * The classpath that is passed off to the Java compiler.
     */
    public String getClassPath() {
        return classpath;
    }


    // -------------------------------------------------------- Private Methods


    /**
     * Method used to initialize classpath for compiles.
     */
    private void initClassPath() {

        URL [] urls = parentClassLoader.getURLs();
        StringBuffer cpath = new StringBuffer();
        String sep = System.getProperty("path.separator");

        for(int i = 0; i < urls.length; i++) {
            // Tomcat 4 can use URL's other than file URL's,
            // a protocol other than file: will generate a
            // bad file system path, so only add file:
            // protocol URL's to the classpath.
            
            if( urls[i].getProtocol().equals("file") ) {
                cpath.append((String)urls[i].getFile()+sep);
            }
        }    

	cpath.append(options.getScratchDir() + sep);

        String cp = (String) context.getAttribute(Constants.SERVLET_CLASSPATH);
        if (cp == null || cp.equals("")) {
            cp = options.getClassPath();
        }

        classpath = cpath.toString() + cp;

        if(log.isDebugEnabled()) {
            log.debug("Compilation classpath initialized: " + getClassPath());
        }
    }

    /**
     * Method used to initialize SecurityManager data.
     */
    private void initSecurity() {

        // Setup the PermissionCollection for this web app context
        // based on the permissions configured for the root of the
        // web app context directory, then add a file read permission
        // for that directory.
        Policy policy = Policy.getPolicy();
        if( policy != null ) {
            try {          
                // Get the permissions for the web app context
                String docBase = context.getRealPath("/");
                if( docBase == null ) {
                    docBase = options.getScratchDir().toString();
                }
                String codeBase = docBase;
                if (!codeBase.endsWith(File.separator)){
                    codeBase = codeBase + File.separator;
                }
                File contextDir = new File(codeBase);
                URL url = contextDir.getCanonicalFile().toURL();
                codeSource = new CodeSource(url,(Certificate[])null);
                permissionCollection = policy.getPermissions(codeSource);

                // Create a file read permission for web app context directory
                if (!docBase.endsWith(File.separator)){
                    permissionCollection.add
                        (new FilePermission(docBase,"read"));
                    docBase = docBase + File.separator;
                } else {
                    permissionCollection.add
                        (new FilePermission
                            (docBase.substring(0,docBase.length() - 1),"read"));
                }
                docBase = docBase + "-";
                permissionCollection.add(new FilePermission(docBase,"read"));

                // Create a file read permission for web app tempdir (work)
                // directory
                String workDir = options.getScratchDir().toString();
                if (!workDir.endsWith(File.separator)){
                    permissionCollection.add
                        (new FilePermission(workDir,"read"));
                    workDir = workDir + File.separator;
                }
                workDir = workDir + "-";
                permissionCollection.add(new FilePermission(workDir,"read"));

                // Allow the JSP to access org.apache.jasper.runtime.HttpJspBase
                permissionCollection.add( new RuntimePermission(
                    "accessClassInPackage.org.apache.jasper.runtime") );

                if (parentClassLoader instanceof URLClassLoader) {
                    URL [] urls = parentClassLoader.getURLs();
                    String jarUrl = null;
                    String jndiUrl = null;
                    for (int i=0; i<urls.length; i++) {
                        if (jndiUrl == null
                                && urls[i].toString().startsWith("jndi:") ) {
                            jndiUrl = urls[i].toString() + "-";
                        }
                        if (jarUrl == null
                                && urls[i].toString().startsWith("jar:jndi:")
                                ) {
                            jarUrl = urls[i].toString();
                            jarUrl = jarUrl.substring(0,jarUrl.length() - 2);
                            jarUrl = jarUrl.substring(0,
                                     jarUrl.lastIndexOf('/')) + "/-";
                        }
                    }
                    if (jarUrl != null) {
                        permissionCollection.add(
                                new FilePermission(jarUrl,"read"));
                        permissionCollection.add(
                                new FilePermission(jarUrl.substring(4),"read"));
                    }
                    if (jndiUrl != null)
                        permissionCollection.add(
                                new FilePermission(jndiUrl,"read") );
                }
            } catch(Exception e) {
                context.log("Security Init for context failed",e);
            }
        }
    }


}