Application: gvSIG desktop

import java.util.ArrayList;

import java.util.Comparator;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.apache.commons.lang3.tuple.Pair;

    private class DefaultCache implements Cache {

        private Map<Pair<Object,Object>,Pair<Object,Long>> data;

        public DefaultCache() {

            this.data = new  HashMap<>();

        }

        @Override

        public Object get(Object context, Object key) {

            Pair<Object, Long> v = this.data.get( Pair.of(context, key) );

            return v.getLeft();

        }

        @Override

        public void put(Object context, Object key, Object value) {

            if( this.data.size()>this.getMaxElements() ) {

                this.reduce();

            }

            this.data.put(Pair.of(context, key), Pair.of(value, new Date().getTime()));

        }

        @Override

        public void remove(Object context, Object key) {

            this.data.remove(Pair.of(context, key));

        }

        @Override

        public void removeAll() {

            this.data = new  HashMap<>();

        }

        private int getMaxElements() {

            return 100;

        }

        private void reduce() {

            List<Map.Entry<Pair<Object, Object>, Pair<Object, Long>>> entries = 

                new ArrayList<>(this.data.entrySet());

            entries.sort(new Comparator<Map.Entry<Pair<Object, Object>, Pair<Object, Long>>>() {

                @Override

                public int compare(Map.Entry<Pair<Object, Object>, Pair<Object, Long>> o1, Map.Entry<Pair<Object, Object>, Pair<Object, Long>> o2) {

                    return o1.getValue().getRight().compareTo(o2.getValue().getRight());

                }

            });

            for( int i=0; i<this.getMaxElements()/2; i++ ) {

                this.data.remove(entries.get(i).getKey());

            }

        }

    }

    private final Cache cache;

        this.cache = new DefaultCache();

    public Cache getCache() {

        return this.cache;

    }

    @Override