From a1ac4c3b76ab0ea01c7a2f2e52721d94bff01717 Mon Sep 17 00:00:00 2001
From: Michael Peter Christen <mc@yacy.net>
Date: Mon, 12 May 2014 15:45:25 +0200
Subject: [PATCH] automatically clear graphics cache

---
 htroot/NetworkPicture.java                    | 22 +++++++++----------
 .../net/yacy/peers/graphics/NetworkGraph.java |  6 +++++
 source/net/yacy/search/Switchboard.java       |  5 +++++
 source/net/yacy/visualization/CircleTool.java |  4 ++++
 4 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/htroot/NetworkPicture.java b/htroot/NetworkPicture.java
index 16234c243..fec8bcc9a 100644
--- a/htroot/NetworkPicture.java
+++ b/htroot/NetworkPicture.java
@@ -36,14 +36,12 @@ import net.yacy.server.serverObjects;
 import net.yacy.server.serverSwitch;
 
 /** draw a picture of the yacy network */
-public class NetworkPicture
-{
+public class NetworkPicture {
 
     private static final ConcurrentLog log = new ConcurrentLog("NetworkPicture");
     private static final Semaphore sync = new Semaphore(1, true);
-    private static EncodedImage buffer = null;
     private static long lastAccessSeconds = 0;
-
+    
     public static EncodedImage respond(
         final RequestHeader header,
         final serverObjects post,
@@ -52,26 +50,26 @@ public class NetworkPicture
         final boolean authorized = sb.adminAuthenticated(header) >= 2;
 
         final long timeSeconds = System.currentTimeMillis() / 1000;
-        if (buffer != null && !authorized && timeSeconds - lastAccessSeconds < 2) {
+        if (NetworkGraph.buffer != null && !authorized && timeSeconds - lastAccessSeconds < 2) {
             if (log.isFine()) log.fine("cache hit (1); authorized = "
                 + authorized
                 + ", timeSeconds - lastAccessSeconds = "
                 + (timeSeconds - lastAccessSeconds));
-            return buffer;
+            return NetworkGraph.buffer;
         }
 
-        if ( buffer != null && sync.availablePermits() == 0 ) {
-            return buffer;
+        if ( NetworkGraph.buffer != null && sync.availablePermits() == 0 ) {
+            return NetworkGraph.buffer;
         }
         sync.acquireUninterruptibly();
 
-        if (buffer != null && !authorized && timeSeconds - lastAccessSeconds < 2) {
+        if (NetworkGraph.buffer != null && !authorized && timeSeconds - lastAccessSeconds < 2) {
             if (log.isFine()) log.fine("cache hit (2); authorized = "
                 + authorized
                 + ", timeSeconds - lastAccessSeconds = "
                 + (timeSeconds - lastAccessSeconds));
             sync.release();
-            return buffer;
+            return NetworkGraph.buffer;
         }
 
         int width = 1280; // 640x480 = VGA, 768x576 = SD/4:3, 1024x576 =SD/16:9 1280x720 = HD/16:9, 1920x1080 = FULL HD/16:9
@@ -124,7 +122,7 @@ public class NetworkPicture
         if ( maxCount > 10000 ) {
             maxCount = 10000;
         }
-        buffer =
+        NetworkGraph.buffer =
             new EncodedImage(NetworkGraph.getNetworkPicture(
                 sb.peers,
                 width,
@@ -141,7 +139,7 @@ public class NetworkPicture
         lastAccessSeconds = System.currentTimeMillis() / 1000;
 
         sync.release();
-        return buffer;
+        return NetworkGraph.buffer;
     }
 
 }
diff --git a/source/net/yacy/peers/graphics/NetworkGraph.java b/source/net/yacy/peers/graphics/NetworkGraph.java
index 705d8b9da..ce87f75dc 100644
--- a/source/net/yacy/peers/graphics/NetworkGraph.java
+++ b/source/net/yacy/peers/graphics/NetworkGraph.java
@@ -53,6 +53,8 @@ import net.yacy.visualization.RasterPlotter;
 public class NetworkGraph {
 
     private final static double DOUBLE_LONG_MAX_VALUE = Long.MAX_VALUE;
+    
+    public static EncodedImage buffer = null;
 
     private static int shortestName = 10;
     private static int longestName = 30;
@@ -81,6 +83,10 @@ public class NetworkGraph {
 
     /** Private constructor to avoid instantiation of utility class. */
     private NetworkGraph() { }
+    
+    public static void clearcache() {
+        buffer = null;
+    }
 
     public static class CircleThreadPiece {
         private final String pieceName;
diff --git a/source/net/yacy/search/Switchboard.java b/source/net/yacy/search/Switchboard.java
index 5c5071a3c..b29b83829 100644
--- a/source/net/yacy/search/Switchboard.java
+++ b/source/net/yacy/search/Switchboard.java
@@ -176,6 +176,7 @@ import net.yacy.peers.DHTSelection;
 import net.yacy.peers.Protocol;
 import net.yacy.peers.Seed;
 import net.yacy.peers.SeedDB;
+import net.yacy.peers.graphics.NetworkGraph;
 import net.yacy.peers.graphics.WebStructureGraph;
 import net.yacy.peers.operation.yacyBuildProperties;
 import net.yacy.peers.operation.yacyRelease;
@@ -200,6 +201,7 @@ import net.yacy.server.http.RobotsTxtConfig;
 import net.yacy.utils.CryptoLib;
 import net.yacy.utils.UPnP;
 import net.yacy.utils.crypt;
+import net.yacy.visualization.CircleTool;
 
 import com.google.common.io.Files;
 
@@ -1999,6 +2001,9 @@ public final class Switchboard extends serverSwitch {
         Cache.commit();
         Digest.cleanup(); // don't let caches become permanent memory leaks
 
+        // clear graphics caches
+        CircleTool.clearcache();
+        NetworkGraph.clearcache();
     }
     
     public int cleanupJobSize() {
diff --git a/source/net/yacy/visualization/CircleTool.java b/source/net/yacy/visualization/CircleTool.java
index 46206ef9f..de8801c38 100644
--- a/source/net/yacy/visualization/CircleTool.java
+++ b/source/net/yacy/visualization/CircleTool.java
@@ -35,6 +35,10 @@ import java.util.Set;
 public class CircleTool {
 
     private static List<int[]> circles = new ArrayList<>();
+    
+    public static void clearcache() {
+        circles.clear();
+    }
 
     private static int[] getCircleCoords(final short radius) {
         if (radius - 1 < circles.size()) return circles.get(radius - 1);