traininfo/util/AndroidTimeoutCache.java

package dk.thoerup.traininfo.util;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

import android.util.Log;


public class AndroidTimeoutCache<K,V> {

        class CacheItem<T> {
                
                public CacheItem(T v) {
                        value = v;
                        lastupdate = android.os.SystemClock.elapsedRealtime();
                }
                
                public boolean isExpired(long now) {
                        return ( (lastupdate+timeout) < now);
                }
                
                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();
                //Log.e("Purge","Purge");
                
                Set<K> keyset = cache.keySet();
                
                for ( Iterator<K> it = keyset.iterator(); it.hasNext() ;) {
                        K key = it.next();
                        
                        CacheItem<V> item = cache.get(key);
                        if ( item.isExpired(now)) { //item too old
                                it.remove();
                                //Log.e("Purge", "removing");
                        }                       
                }       
                
        }
        
        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.isExpired(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	import java.util.Iterator;
5	import java.util.Set;
6
7	import android.util.Log;
8
9
10	public class AndroidTimeoutCache<K,V> {
11
12	class CacheItem<T> {
13
14	public CacheItem(T v) {
15	value = v;
16	lastupdate = android.os.SystemClock.elapsedRealtime();
17	}
18
19	public boolean isExpired(long now) {
20	return ( (lastupdate+timeout) < now);
21	}
22
23	public long lastupdate;
24	public T value;
25	}
26
27	private HashMap<K,CacheItem<V>> cache = new HashMap<K,CacheItem<V>>();
28	private long timeout;
29
30	public AndroidTimeoutCache(int timeout) {
31	this.timeout = timeout;
32	}
33
34	public void purgeOldEntries() {
35
36	long now = android.os.SystemClock.elapsedRealtime();
37	//Log.e("Purge","Purge");
38
39	Set<K> keyset = cache.keySet();
40
41	for ( Iterator<K> it = keyset.iterator(); it.hasNext() ;) {
42	K key = it.next();
43
44	CacheItem<V> item = cache.get(key);
45	if ( item.isExpired(now)) { //item too old
46	it.remove();
47	//Log.e("Purge", "removing");
48	}
49	}
50
51	}
52
53	public void put(K k, V v) {
54	CacheItem<V> item= new CacheItem<V>(v);
55	cache.put(k, item);
56	}
57
58	public V get(K k) {
59	long now = android.os.SystemClock.elapsedRealtime();
60
61	CacheItem<V> item = cache.get(k);
62
63
64	if (item != null) {
65	if ( item.isExpired(now) ) { //item too old
66	return null;
67	} else {
68	return item.value; //item still good
69	}
70	} else {
71	return null; // no item found
72	}
73
74	}
75
76	}