Java tutorial
/* * $Header: /home/cvs/jakarta-tomcat-catalina/modules/cluster/src/share/org/apache/catalina/cluster/tcp/ReplicationValve.java,v 1.9 2004/01/13 05:26:59 fhanik Exp $ * $Revision: 1.9 $ * $Date: 2004/01/13 05:26:59 $ * * ==================================================================== * * The Apache Software License, Version 1.1 * * Copyright (c) 1999 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. 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For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * * [Additional notices, if required by prior licensing conditions] * */ package org.apache.catalina.cluster.tcp; import java.io.IOException; import java.util.ArrayList; import java.util.Enumeration; import java.util.Iterator; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.Cookie; import javax.servlet.http.HttpSession; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.catalina.Container; import org.apache.catalina.HttpRequest; import org.apache.catalina.HttpResponse; import org.apache.catalina.Logger; import org.apache.catalina.Request; import org.apache.catalina.Response; import org.apache.catalina.Valve; import org.apache.catalina.ValveContext; import org.apache.catalina.util.StringManager; import org.apache.catalina.valves.*; import org.apache.catalina.cluster.SessionMessage; import org.apache.catalina.cluster.tcp.SimpleTcpCluster; import org.apache.catalina.cluster.ClusterSession; import org.apache.catalina.cluster.ClusterManager; /** * <p>Implementation of a Valve that logs interesting contents from the * specified Request (before processing) and the corresponding Response * (after processing). It is especially useful in debugging problems * related to headers and cookies.</p> * * <p>This Valve may be attached to any Container, depending on the granularity * of the logging you wish to perform.</p> * * @author Craig R. McClanahan * @version $Revision: 1.9 $ $Date: 2004/01/13 05:26:59 $ */ public class ReplicationValve extends ValveBase { private static org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory .getLog(SimpleTcpCluster.class); // ----------------------------------------------------- Instance Variables /** * The descriptive information related to this implementation. */ private static final String info = "org.apache.catalina.cluster.tcp.ReplicationValve/1.0"; /** * The StringManager for this package. */ protected static StringManager sm = StringManager.getManager(Constants.Package); /** * holds file endings to not call for like images and others */ protected java.util.regex.Pattern[] reqFilters = new java.util.regex.Pattern[0]; protected int debug = 0; // ------------------------------------------------------------- Properties public ReplicationValve() { } /** * Return descriptive information about this Valve implementation. */ public String getInfo() { return (info); } // --------------------------------------------------------- Public Methods protected static long totalSendTime = 0; protected static long nrOfRequests = 0; protected static long lastSendTime = 0; protected static synchronized void addClusterSendTime(long time) { totalSendTime += time; nrOfRequests++; if ((nrOfRequests % 100) == 0) { log.info("Average cluster serialize/send time=" + (totalSendTime / nrOfRequests) + " ms for " + nrOfRequests + " requests (" + totalSendTime + "ms)."); lastSendTime = System.currentTimeMillis(); } //end if } /** * Log the interesting request parameters, invoke the next Valve in the * sequence, and log the interesting response parameters. * * @param request The servlet request to be processed * @param response The servlet response to be created * @param context The valve context used to invoke the next valve * in the current processing pipeline * * @exception IOException if an input/output error occurs * @exception ServletException if a servlet error occurs */ public void invoke(Request request, Response response, ValveContext context) throws IOException, ServletException { //this happens before the request context.invokeNext(request, response); //this happens after the request try { long start = System.currentTimeMillis(); HttpRequest hrequest = (HttpRequest) request; HttpServletRequest hreq = (HttpServletRequest) hrequest.getRequest(); HttpSession session = hreq.getSession(false); if (!(request.getContext().getManager() instanceof ClusterManager)) return; ClusterManager manager = (ClusterManager) request.getContext().getManager(); SimpleTcpCluster cluster = (SimpleTcpCluster) getContainer().getCluster(); if (cluster == null) { log.warn("No cluster configured for this request."); return; } //first check for session invalidations String[] invalidIds = manager.getInvalidatedSessions(); if (invalidIds.length > 0) { for (int i = 0; i < invalidIds.length; i++) { try { SessionMessage imsg = manager.requestCompleted(invalidIds[i]); if (imsg != null) cluster.send(imsg); } catch (Exception x) { log.error("Unable to send session invalid message over cluster.", x); } } } String id = null; if (session != null) id = session.getId(); else return; if (id == null) return; if ((request.getContext().getManager() == null) || (!(request.getContext().getManager() instanceof ClusterManager))) return; String uri = hrequest.getDecodedRequestURI(); boolean filterfound = false; for (int i = 0; (i < reqFilters.length) && (!filterfound); i++) { java.util.regex.Matcher matcher = reqFilters[i].matcher(uri); filterfound = matcher.matches(); } //for if (filterfound) return; log.debug("Invoking replication request on " + uri); SessionMessage msg = manager.requestCompleted(id); if (msg == null) return; cluster.send(msg); long stop = System.currentTimeMillis(); addClusterSendTime(stop - start); } catch (Exception x) { log.error("Unable to perform replication request.", x); } } /** * Return a String rendering of this object. */ public String toString() { StringBuffer sb = new StringBuffer("ReplicationValve["); if (container != null) sb.append(container.getName()); sb.append("]"); return (sb.toString()); } public void setFilter(String filter) { log.debug("Loading request filters=" + filter); java.util.StringTokenizer t = new java.util.StringTokenizer(filter, ";"); this.reqFilters = new java.util.regex.Pattern[t.countTokens()]; int i = 0; while (t.hasMoreTokens()) { String s = t.nextToken(); log.debug("Request filter=" + s); try { reqFilters[i++] = java.util.regex.Pattern.compile(s); } catch (Exception x) { log.error("Unable to compile filter " + s, x); } } } public void setDebug(int debug) { this.debug = debug; } // ------------------------------------------------------ Protected Methods }