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