From 323d75df568fded734bbd768fff0368801198f04 Mon Sep 17 00:00:00 2001
From: Christian Klinger
Date: Fri, 10 Jun 2016 13:28:48 +0200
Subject: removed the caching mechanism.

---
 .../java/org/openslx/bwlp/sat/web/WebServer.java   | 61 ++++++----------------
 1 file changed, 16 insertions(+), 45 deletions(-)

(limited to 'dozentenmodulserver/src/main/java')

diff --git a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebServer.java b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebServer.java
index 5f82bac1..232ab93d 100644
--- a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebServer.java
+++ b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebServer.java
@@ -3,8 +3,7 @@ package org.openslx.bwlp.sat.web;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.sql.SQLException;
-import java.util.Collections;
-import java.util.LinkedHashMap;
+
 import java.util.Map;
 
 import org.apache.commons.io.output.ByteArrayOutputStream;
@@ -12,7 +11,6 @@ import org.apache.log4j.Logger;
 import org.openslx.bwlp.sat.database.mappers.DbLecture;
 import org.openslx.bwlp.sat.fileserv.FileServer;
 import org.openslx.bwlp.thrift.iface.TNotFoundException;
-import org.openslx.util.GenericDataCache;
 import org.openslx.util.Json;
 import org.openslx.util.vm.VmMetaData;
 import org.simpleframework.xml.Serializer;
@@ -24,39 +22,8 @@ public class WebServer extends NanoHTTPD {
 
 	private static final Logger LOGGER = Logger.getLogger(WebServer.class);
 
-	private static final int LIST_CACHE_MS = 15000;
-	private static final int LIST_CACHE_MAX_ENTRIES = 16;
-
-	private static final Map<String, XmlDataCache> lectureListCache = Collections.synchronizedMap(new LinkedHashMap<String, XmlDataCache>() {
-		private static final long serialVersionUID = -8461839969909678055L;
-
-		@Override
-		protected boolean removeEldestEntry(Map.Entry<String, XmlDataCache> eldest) {
-			return size() > LIST_CACHE_MAX_ENTRIES;
-		}
-	});
-
 	private static final Serializer serializer = new Persister();
 
-	private class XmlDataCache extends GenericDataCache<byte[]> {
-
-		private final String locationId;
-
-		public XmlDataCache(String locations) {
-			super(LIST_CACHE_MS);
-			this.locationId = locations;
-		}
-
-		@Override
-		protected byte[] update() throws Exception {
-			VmChooserListXml listXml = DbLecture.getUsableListXml(false, locationId);
-			ByteArrayOutputStream baos = new ByteArrayOutputStream();
-			serializer.write(listXml, baos);
-			return baos.toByteArray();
-		}
-
-	}
-
 	public WebServer(int port) {
 		super("127.0.0.1", port);
 		super.maxRequestSize = 65535;
@@ -65,7 +32,8 @@ public class WebServer extends NanoHTTPD {
 	/**
 	 * Extract request source ip address. Honors the x-forwarded-for header.
 	 * 
-	 * @param headers map of headers as supplied by nanohttpd
+	 * @param headers
+	 *            map of headers as supplied by nanohttpd
 	 * @return IP address, or empty string if unknown
 	 */
 	private String extractIp(Map<String, String> headers) {
@@ -107,7 +75,12 @@ public class WebServer extends NanoHTTPD {
 	private Response handle(IHTTPSession session, String uri) {
 		// Our special stuff
 		if (uri.startsWith("/vmchooser/list")) {
-			return serveVmChooserList(session.getParms());
+			try {
+				return serveVmChooserList(session.getParms());
+			} catch (Exception e) {
+				LOGGER.debug("problem while retrieving the vmChooserList", e);
+				return internalServerError();
+			}
 		}
 		if (uri.startsWith("/vmchooser/lecture/")) {
 			return serveLectureStart(uri.substring(19));
@@ -152,20 +125,18 @@ public class WebServer extends NanoHTTPD {
 				new ByteArrayInputStream(meta.getFilteredDefinitionArray()));
 	}
 
-	private Response serveVmChooserList(Map<String, String> params) {
+	private Response serveVmChooserList(Map<String, String> params) throws Exception {
 		String locations = params.get("locations");
-		XmlDataCache cache = lectureListCache.get(locations);
-		if (cache == null) {
-			cache = new XmlDataCache(locations);
-			lectureListCache.put(locations, cache);
-		}
+
+		VmChooserListXml listXml = DbLecture.getUsableListXml(false, locations);
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		serializer.write(listXml, baos);
 		return new NanoHTTPD.Response(NanoHTTPD.Response.Status.OK, "text/xml; charset=utf-8",
-				new ByteArrayInputStream(cache.get()));
+				new ByteArrayInputStream(baos.toByteArray()));
 	}
 
 	public static Response internalServerError() {
-		return new NanoHTTPD.Response(NanoHTTPD.Response.Status.INTERNAL_ERROR, "text/plain",
-				"Internal Server Error");
+		return new NanoHTTPD.Response(NanoHTTPD.Response.Status.INTERNAL_ERROR, "text/plain", "Internal Server Error");
 	}
 
 	public static Response notFound() {
-- 
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