Examples of javolution.util.FastMap

javolution.util.FastMap
synchronized(index) { // javolution.util.Index instances are unique. sparseVector.put(index, value); } ... // Get synchronized(index) { // Blocking only when accessing the same index. value = sparseVector.get(index); // Latest value guaranteed. }[/code]

{@link FastMap} may use custom key comparators; the default comparator iseither {@link FastComparator#DIRECT DIRECT} or {@link FastComparator#REHASH REHASH} based upon the current Javolution Configuration. Users may explicitly set the key comparator to {@link FastComparator#DIRECT DIRECT} for optimum performancewhen the hash codes are well distributed for all run-time platforms (e.g. calculated hash codes).

Custom key comparators are extremely useful for value retrieval when map's keys and argument keys are not of the same class (such as {@link String} and {@link javolution.text.Text Text} ( {@link FastComparator#LEXICAL LEXICAL})), to substitute more efficient hash code calculations ( {@link FastComparator#STRING STRING}) or for identity maps ( {@link FastComparator#IDENTITY IDENTITY}):[code] FastMap identityMap = new FastMap().setKeyComparator(FastComparator.IDENTITY); [/code]

{@link FastMap.Entry} can quickly be iterated over (forward or backward)without using iterators. For example:[code] FastMap map = ...; for (FastMap.Entry e = map.head(), end = map.tail(); (e = e.getNext()) != end;) { String key = e.getKey(); // No typecast necessary. Thread value = e.getValue(); // No typecast necessary. }[/code]

Custom map implementations may override the {@link #newEntry} method in order to return their own {@link Entry} implementation (with additional fields for example).

{@link FastMap} are {@link Reusable reusable}; they maintain an internal pool of Map.Entry objects. When an entry is removed from a map, it is automatically restored to its pool. Any new entry is allocated in the same memory area as the map itself (RTSJ). If the map is shared, removed entries are not recycled but only dereferenced (to maintain thread-safety)

{@link #shared() Shared} maps do not use internal synchronization, except in case ofconcurrent modifications of the map structure (entries being added/deleted). Reads and iterations are never synchronized and never blocking. With regards to the memory model, shared maps are equivalent to shared non-volatile variables (no "happen before" guarantee). They can be used as very efficient lookup tables. For example:[code] public class Unit { static FastMap labels = new FastMap().shared(); ... public String toString() { String label = labels.get(this); // No synchronization. if (label != null) return label; label = makeLabel(); labels.put(this, label); return label; } }[/code]

Implementation Note: To maintain time-determinism, rehash/resize is performed only when the map's size is small (see chart). For large maps (size > 512), the map is divided recursively into (64) smaller sub-maps. The cost of the dispatching (based upon hashcode value) has been measured to be at most 20% of the access time (and most often way less).
@author Jean-Marie Dautelle @version 5.2, September 11, 2007

        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiByCap", params);
    }


    public List<Utente> getUtentiByCitta(String citta, long idCentro, int pagina) throws DataAccessException {
        Map params = new FastMap();
        params.put("citta", citta);
        params.put("idCentro", idCentro);
        params.put("limit", offset);
        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiByCitta", params);
    }

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        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiByCitta", params);
    }


    public List<Utente> getUtentiByNominativo(String nominativo, long idCentro, int pagina) throws DataAccessException {
        Map params = new FastMap();
        params.put("nominativoLower", (new StringBuilder(nominativo.toLowerCase().concat("%")).toString()));
        // params.put("nominativoUpper", (new
        // StringBuilder(nominativo.toUpperCase().concat("%")).toString()));
        params.put("idCentro", idCentro);
        params.put("limit", offset);
        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiByNominativo", params);
    }

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        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiByNominativo", params);
    }


    public List<Utente> getUtentiByProvincia(String provincia, long idCentro, int pagina) throws DataAccessException {
        Map params = new FastMap();
        params.put("provincia", provincia);
        params.put("idCentro", idCentro);
        params.put("limit", offset);
        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiByProvincia", params);
    }

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    }


    @SuppressWarnings("unchecked")
    protected Map referenceData(HttpServletRequest req, int page) throws Exception {
        if (page == 1) {
            Map model = new FastMap();
            model.put(Constant.FREE_LIST, gruppiService.getGruppiCentro(WebUtils.getIdCentro(req)));
            return model;
        }
        return null;
    }

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        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiByProvincia", params);
    }


    public List<UtenteLight> getUtentiCentro(long idCentro, int pagina) throws DataAccessException {
        Map params = new FastMap();
        params.put("idCentro", idCentro);
        params.put("limit", offset);
        params.put("offset", pagina * offset);
        return getSqlMapClientTemplate().queryForList("getUtentiCentro", params);
    }

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        return (Long) getSqlMapClientTemplate().insert("insertStorico", storico);
    }


    @SuppressWarnings("unchecked")
    public List<Spedizione> getStorico(SpedizioneCriteria crit) {
        Map params = new FastMap();
        params.put("start", crit.getInizio());
        params.put("stop", crit.getFine());
        params.put("tipo", crit.getTipo());
        params.put("idCentro", crit.getCentro());
        return getSqlMapClientTemplate().queryForList("getStorici", params);
    }

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        binder.registerCustomEditor(String.class, trimmerEditor);
    }


    @SuppressWarnings("unchecked")
    protected Map referenceData(HttpServletRequest req) throws Exception {
        Map map = new FastMap();
        map.put(Constant.USERNAME, req.getRemoteUser());
        return map;
    }

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    public List<Annuncio> getAnnunci(int tipo) throws DataAccessException {
        return getSqlMapClientTemplate().queryForList("getAnnunci", tipo);
    }


    public List<Annuncio> getAnnunci(int tipo, int pageNo, long centro) throws DataAccessException {
        Map params = new FastMap();
        params.put("tipo", tipo);
        params.put("limit", offset);
        params.put("offset", offset * pageNo);
        params.put("idCentro", centro);
        return getSqlMapClientTemplate().queryForList("getAnnunciCentro", params);
    }

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    public int updateGruppo(Gruppo gruppo, long idCentro) {
        return getSqlMapClientTemplate().update("updateGruppo", new GruppoImpl(gruppo, idCentro));
    }


    private Map prepareParams(long id, long idCentro) {
        Map params = new FastMap();
        params.put("id", id);
        params.put("idCentro", idCentro);
        return params;
    }

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        binder.registerCustomEditor(String.class, trimmerEditor);
    }


    @SuppressWarnings("unchecked")
    protected Map referenceData(HttpServletRequest req) throws Exception {
        Map map = new FastMap();
        map.put(Constant.USERNAME, req.getRemoteUser());
        return map;
    }

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