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Add softref option for chunk snapshot cache

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This commit is contained in:
Mike Primm 2013-06-25 01:09:25 -05:00
parent 5bc4de6a8b
commit b85c38e3a7
3 changed files with 18 additions and 7 deletions
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2
src/main/java/org/dynmap/bukkit/DynmapPlugin.java
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@ -843,7 +843,7 @@ public class DynmapPlugin extends JavaPlugin implements DynmapAPI {
return;
}
playerList = core.playerList;
sscache = new SnapshotCache(core.getSnapShotCacheSize());
sscache = new SnapshotCache(core.getSnapShotCacheSize(), core.useSoftRefInSnapShotCache());
/* Get map manager from core */
mapManager = core.getMapManager();

18
src/main/java/org/dynmap/bukkit/SnapshotCache.java
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@ -3,6 +3,7 @@ package org.dynmap.bukkit;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.lang.ref.SoftReference;
import java.util.IdentityHashMap;
import java.util.LinkedHashMap;
import java.util.Map;
@ -20,9 +21,10 @@ public class SnapshotCache {
private ReferenceQueue<SnapshotRec> refqueue;
private long cache_attempts;
private long cache_success;
private boolean softref;
private static class CacheRec {
WeakReference<SnapshotRec> ref;
Reference<SnapshotRec> ref;
boolean hasbiome;
boolean hasrawbiome;
boolean hasblockdata;
@ -32,12 +34,12 @@ public class SnapshotCache {
@SuppressWarnings("serial")
public class CacheHashMap extends LinkedHashMap<String, CacheRec> {
private int limit;
private IdentityHashMap<WeakReference<SnapshotRec>, String> reverselookup;
private IdentityHashMap<Reference<SnapshotRec>, String> reverselookup;
public CacheHashMap(int lim) {
super(16, (float)0.75, true);
limit = lim;
reverselookup = new IdentityHashMap<WeakReference<SnapshotRec>, String>();
reverselookup = new IdentityHashMap<Reference<SnapshotRec>, String>();
}
protected boolean removeEldestEntry(Map.Entry<String, CacheRec> last) {
boolean remove = (size() >= limit);
@ -51,9 +53,10 @@ public class SnapshotCache {
/**
* Create snapshot cache
*/
public SnapshotCache(int max_size) {
public SnapshotCache(int max_size, boolean softref) {
snapcache = new CacheHashMap(max_size);
refqueue = new ReferenceQueue<SnapshotRec>();
this.softref = softref;
}
private String getKey(String w, int cx, int cz) {
return w + ":" + cx + ":" + cz;
@ -127,7 +130,10 @@ public class SnapshotCache {
rec.hasbiome = biome;
rec.hasrawbiome = biomeraw;
rec.hashighesty = highesty;
rec.ref = new WeakReference<SnapshotRec>(ss, refqueue);
if (softref)
rec.ref = new SoftReference<SnapshotRec>(ss, refqueue);
else
rec.ref = new WeakReference<SnapshotRec>(ss, refqueue);
CacheRec prevrec = snapcache.put(key, rec);
if(prevrec != null) {
snapcache.reverselookup.remove(prevrec.ref);

5
src/main/resources/configuration.txt
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@ -412,6 +412,11 @@ custom-commands:
preupdatecommand: ""
# Command run just after any image file is written or updated: run with single parameter with fully qualified file name
postupdatecommand: ""
# Snapshot cache size, in chunks
snapshotcachesize: 500
# Snapshot cache uses soft references (true), else weak references (false)
soft-ref-cache: true
# Set to true to enable verbose startup messages - can help with debugging map configuration problems
# Set to false for a much quieter startup log