adding debug messages

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/Util.java

@@ -35,11 +35,12 @@ import org.json.JSONObject;
 
 public class Util {
 	public static final System.Logger LOG = System.getLogger("Util");
-	private static final Pattern UML_PATTERN = Pattern.compile("@start(\\w+)(.*)@end(\\1)",Pattern.DOTALL);
+	private static final Pattern UML_PATTERN = Pattern.compile("@start(\\w+)(.*?)@end(\\1)",Pattern.DOTALL);
 	private static File plantumlJar = null;
 	private static final JParsedown MARKDOWN = new JParsedown();
 	public static final String SHA1 = "SHA-1";
 	private static final MessageDigest SHA1_DIGEST;
+	private static final Map<Integer,String> umlCache = new HashMap<>();
 
 	static {
 		try {
@@ -79,11 +80,22 @@ public class Util {
 		try {
 			if (plantumlJar != null && plantumlJar.exists()) {
 				var matcher = UML_PATTERN.matcher(source);
-				if (matcher.find()) {
+				while (matcher.find()) {
 					var uml = matcher.group(0).trim();
 					var start = matcher.start(0);
 					var end = matcher.end(0);
 
+					var umlHash = uml.hashCode();
+					LOG.log(DEBUG,"Hash of Plantuml code: {0}",umlHash);
+					var svg = umlCache.get(umlHash);
+					if (svg != null){
+						LOG.log(DEBUG,"Serving Plantuml generated SVG from cache…");
+						source = source.substring(0, start) + svg + source.substring(end);
+						matcher = UML_PATTERN.matcher(source);
+						continue;
+					}
+
+					LOG.log(DEBUG,"Cache miss. Generating SVG from plantuml code…");
 					ProcessBuilder processBuilder = new ProcessBuilder("java", "-jar", plantumlJar.getAbsolutePath(), "-tsvg", "-pipe");
 					var ignored = processBuilder.redirectErrorStream();
 					var process = processBuilder.start();
@@ -94,8 +106,11 @@ public class Util {
 
 					try (InputStream is = process.getInputStream()) {
 						byte[] out = is.readAllBytes();
-						var svg = new String(out, UTF_8);
+						LOG.log(DEBUG,"Generated SVG. Pushing to cache…");
+						svg = new String(out, UTF_8);
+						umlCache.put(umlHash,svg);
 						source = source.substring(0, start) + svg + source.substring(end);
+						matcher = UML_PATTERN.matcher(source);
 					}
 				}
 			}

web/src/main/resources/web/css/bloodshed.css

@@ -57,8 +57,9 @@ footer {
   margin: 5px;
 }
 
-img {
+img, svg {
 	max-width: 100%;
+	height: auto !important;
 }
 
 nav {

web/src/main/resources/web/css/default.css

@@ -57,8 +57,9 @@ footer {
   margin: 5px;
 }
 
-img {
+img, svg {
 	max-width: 100%;
+	height: auto !important;
 }
 
 nav {

web/src/main/resources/web/css/winter.css

@@ -57,17 +57,18 @@ footer {
   margin: 5px;
 }
 
-img {
+img, svg {
 	max-width: 100%;
+	height: auto !important;
 }
 
 nav {
-  position: sticky;
-  z-index: 100;
-  top: 0;
-  padding: 5px;
-  margin: 0 0 10px 0;
-  border-bottom: 1px solid;
+    position: sticky;
+    z-index: 100;
+    top: 0;
+    padding: 5px;
+    margin: 0 0 10px 0;
+    border-bottom: 1px solid;
 }
 
 td, tr{