performance hacks

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@8001 6c8d7289-2bf4-0310-a012-ef5d649a1542

htroot/yacy/idx.java

@@ -63,7 +63,7 @@ public final class idx {
             for (final ReferenceContainer<HostReference> references: idx) {
                 prop.put("list_" + count + "_term", ASCII.String(references.getTermHash()));
                 final Iterator<HostReference> referenceIterator = references.entries();
-                final StringBuilder s = new StringBuilder();
+                final StringBuilder s = new StringBuilder(references.size() * 20); // pre-set of guessed size reduces expandCapacity() and increases performance
                 HostReference reference;
                 while (referenceIterator.hasNext()) {
                     reference = referenceIterator.next();

htroot/yacysearch.java

@@ -728,7 +728,7 @@ public class yacysearch {
             prop.put("num-results_globalresults_remotePeerCount", Formatter.number(theSearch.getRankingResult().getRemotePeerCount(), true));
 
             // compose page navigation
-            final StringBuilder resnav = new StringBuilder();
+            final StringBuilder resnav = new StringBuilder(200);
             final int thispage = offset / theQuery.displayResults();
             if (thispage == 0) {
             	resnav.append("<img src=\"env/grafics/navdl.gif\" alt=\"arrowleft\" width=\"16\" height=\"16\" />&nbsp;");

source/de/anomic/http/server/HTTPDemon.java

@@ -96,7 +96,8 @@ public final class HTTPDemon implements serverHandler, Cloneable {
     public static final int ERRORCASE_MESSAGE = 4;
     public static final int ERRORCASE_FILE = 5;
     private static final File TMPDIR = new File(System.getProperty("java.io.tmpdir"));
-    private static final FileItemFactory DISK_FILE_ITEM_FACTORY = new DiskFileItemFactory(5 * 1024 * 1024, TMPDIR);
+    private static final int SIZE_FILE_THRESHOLD = 20 * 1024 * 1024;
+    private static final FileItemFactory DISK_FILE_ITEM_FACTORY = new DiskFileItemFactory(SIZE_FILE_THRESHOLD, TMPDIR);
 
     private static AlternativeDomainNames alternativeResolver = null;
 
@@ -815,6 +816,9 @@ public final class HTTPDemon implements serverHandler, Cloneable {
             throw new IOException("the request is not a multipart-message!");
         }
 
+        // reject too large uploads
+        if (request.getContentLength() > SIZE_FILE_THRESHOLD) throw new IOException("FileUploadException: uploaded file too large = " + request.getContentLength());
+
         // check if we have enough memory
         if (!MemoryControl.request(request.getContentLength() * 3, false)) {
         	throw new IOException("not enough memory available for request. request.getContentLength() = " + request.getContentLength() + ", MemoryControl.available() = " + MemoryControl.available());