From 36c2a59ead341539dea9a25c7f514f0ecd8177d8 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 24 Apr 2018 11:34:41 +0200
Subject: Tweak TimeoutHashMap

---
 src/main/java/org/openslx/util/TimeoutHashMap.java | 21 ++++++++++++--
 .../java/org/openslx/util/TimeoutReference.java    | 32 ++++++++++++----------
 2 files changed, 36 insertions(+), 17 deletions(-)

diff --git a/src/main/java/org/openslx/util/TimeoutHashMap.java b/src/main/java/org/openslx/util/TimeoutHashMap.java
index 3efb367..8655cc3 100644
--- a/src/main/java/org/openslx/util/TimeoutHashMap.java
+++ b/src/main/java/org/openslx/util/TimeoutHashMap.java
@@ -1,6 +1,7 @@
 package org.openslx.util;
 
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
@@ -47,9 +48,13 @@ public class TimeoutHashMap<K, V> implements Map<K, V>
 		TimeoutReference<V> timeoutReference = map.get( key );
 		if ( timeoutReference == null )
 			return null;
-		return timeoutReference.get();
+		V obj = timeoutReference.get();
+		if ( obj == null && timeoutReference.isInvalid() ) {
+			map.remove( key );
+		}
+		return obj;
 	}
-
+	
 	@Override
 	public V put( K key, V value )
 	{
@@ -86,6 +91,18 @@ public class TimeoutHashMap<K, V> implements Map<K, V>
 	{
 		return map.keySet();
 	}
+	
+	public Map<K, V> getImmutableSnapshot()
+	{
+		Map<K, V> copy = new HashMap<>();
+		for (Entry<K, TimeoutReference<V>> i : map.entrySet()) {
+			V v = i.getValue().get();
+			if (i.getValue().isInvalid())
+				continue;
+			copy.put(i.getKey(), v);
+		}
+		return Collections.unmodifiableMap( copy );
+	}
 
 	@Override
 	public Collection<V> values()
diff --git a/src/main/java/org/openslx/util/TimeoutReference.java b/src/main/java/org/openslx/util/TimeoutReference.java
index e86c6c7..ddcca36 100644
--- a/src/main/java/org/openslx/util/TimeoutReference.java
+++ b/src/main/java/org/openslx/util/TimeoutReference.java
@@ -10,9 +10,10 @@ public class TimeoutReference<T>
 {
 
 	private final long timeoutMs;
+	private final boolean refreshOnGet;
+	private final T item;
 	private long deadline;
-	private boolean refreshOnGet;
-	private T item;
+	private boolean invalid;
 
 	public TimeoutReference( boolean refreshOnGet, long timeoutMs, T item )
 	{
@@ -29,33 +30,34 @@ public class TimeoutReference<T>
 
 	public synchronized T get()
 	{
-		if ( item != null ) {
-			final long now = System.currentTimeMillis();
-			if ( deadline < now ) {
-				item = null;
-			} else if ( refreshOnGet ) {
-				deadline = now + timeoutMs;
-			}
+		if ( item == null || invalid )
+			return null;
+		final long now = System.currentTimeMillis();
+		if ( deadline < now ) {
+			invalid = true;
+			return null;
+		}
+		if ( refreshOnGet ) {
+			deadline = now + timeoutMs;
 		}
 		return item;
 	}
-
-	public synchronized void set( T newItem )
+	
+	synchronized boolean isInvalid()
 	{
-		this.item = newItem;
-		this.deadline = System.currentTimeMillis() + timeoutMs;
+		return invalid;
 	}
 
 	@Override
 	public int hashCode()
 	{
-		return item.hashCode();
+		return item == null ? super.hashCode() : item.hashCode();
 	}
 
 	@Override
 	public boolean equals( Object o )
 	{
-		return this == o || item.equals( o );
+		return ( this == o || this.item == o || ( o != null && o.equals( this.item ) ) );
 	}
 
 }
-- 
cgit v1.2.3-55-g7522