traininfo/util/AndroidTimeoutCache.java

package dk.thoerup.traininfo.util;

import java.util.HashMap;


public class AndroidTimeoutCache<K,V> {

        class CacheItem<T> {
                
                public CacheItem(T v) {
                        value = v;
                        lastupdate = android.os.SystemClock.elapsedRealtime();
                }
                
                public long lastupdate;
                public T value;
        }
        
        private HashMap<K,CacheItem<V>> cache = new HashMap<K,CacheItem<V>>();
        private long timeout;
        
        public AndroidTimeoutCache(int timeout) {
                this.timeout = timeout; 
        }
        
        public void purgeOldEntries() {
                
                long now = android.os.SystemClock.elapsedRealtime();
                
                for (K key : cache.keySet()) {
                        CacheItem<V> item = cache.get(key);
                        if ( (item.lastupdate+timeout) < now) { //item too old
                                cache.remove(key);
                        }
                }
        }
        
        public void put(K k, V v) {
                CacheItem<V> item= new CacheItem<V>(v);
                cache.put(k, item);
        }
        
        public V get(K k) {
                long now = android.os.SystemClock.elapsedRealtime();
                
                CacheItem<V> item = cache.get(k);
                                
                
                if (item != null) {
                        if ( (item.lastupdate+timeout) < now) { //item too old
                                return null;
                        } else {
                                return item.value; //item still good
                        }
                } else {
                        return null; // no item found
                }
                
        }
        
}
1	package dk.thoerup.traininfo.util;
2
3	import java.util.HashMap;
4
5
6	public class AndroidTimeoutCache<K,V> {
7
8	class CacheItem<T> {
9
10	public CacheItem(T v) {
11	value = v;
12	lastupdate = android.os.SystemClock.elapsedRealtime();
13	}
14
15	public long lastupdate;
16	public T value;
17	}
18
19	private HashMap<K,CacheItem<V>> cache = new HashMap<K,CacheItem<V>>();
20	private long timeout;
21
22	public AndroidTimeoutCache(int timeout) {
23	this.timeout = timeout;
24	}
25
26	public void purgeOldEntries() {
27
28	long now = android.os.SystemClock.elapsedRealtime();
29
30	for (K key : cache.keySet()) {
31	CacheItem<V> item = cache.get(key);
32	if ( (item.lastupdate+timeout) < now) { //item too old
33	cache.remove(key);
34	}
35	}
36	}
37
38	public void put(K k, V v) {
39	CacheItem<V> item= new CacheItem<V>(v);
40	cache.put(k, item);
41	}
42
43	public V get(K k) {
44	long now = android.os.SystemClock.elapsedRealtime();
45
46	CacheItem<V> item = cache.get(k);
47
48
49	if (item != null) {
50	if ( (item.lastupdate+timeout) < now) { //item too old
51	return null;
52	} else {
53	return item.value; //item still good
54	}
55	} else {
56	return null; // no item found
57	}
58
59	}
60
61	}