How to use

DirectMappedCache

in

cascading.util.cache

@Override
public CascadingCache create( FlowProcess flowProcess )
 {
 return new DirectMappedCache();
 }

@Override
public boolean containsKey( Object key )
 {
 if( key == null )
  throw new IllegalArgumentException( "null keys are not permitted" );
 return get( key ) != null;
 }

@Override
public Value get( Object key )
 {
 int index = index( key );
 Entry<Key, Value> existing = elements[ index ];
 if( existing == null || !key.equals( existing.getKey() ) )
  return null;
 return existing.getValue();
 }

int index = index( key );
Entry<Key, Value> existing = elements[ index ];
if( putCalls % getCapacity() == 0 )
 long totalMem = runtime.totalMemory() / 1024 / 1024;
 LOG.info( "mem on flush (mb), free: " + freeMem + ", total: " + totalMem + ", max: " + maxMem );
 LOG.info( "capacity={}, puts={}, collisions={}, fill factor={}%", getCapacity(), putCalls, collisions,
  ( (double) getCapacity() / actualSize ) * 100 );
 float percent = (float) totalMem / (float) maxMem;
 if( percent < 0.80F )

@Override
public void putAll( Map<? extends Key, ? extends Value> m )
 {
 for( Entry<? extends Key, ? extends Value> entry : m.entrySet() )
  put( entry.getKey(), entry.getValue() );
 }

private CascadingCache<Object, Object> getDirectMappedCache( int capacity, CacheEvictionCallback cacheEvictionCallback )
 {
 CascadingCache<Object, Object> map = new DirectMappedCache<Object, Object>();
 map.setCacheEvictionCallback( cacheEvictionCallback );
 map.setCapacity( capacity );
 map.initialize();
 return map;
 }

@Override
public Value remove( Object key )
 {
 if( key == null )
  throw new IllegalArgumentException( "key cannot be null" );
 int index = index( key );
 Entry<Key, Value> existing = elements[ index ];
 if( existing == null || !existing.getKey().equals( key ) )
  return null;
 elements[ index ] = null;
 actualSize--;
 evictionCallBack.evict( existing );
 return existing.getValue();
 }