| package org.apache.directmemory.memory; |
| |
| import java.io.IOException; |
| import java.nio.BufferOverflowException; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.directmemory.memory.allocator.Allocator; |
| import org.apache.directmemory.memory.allocator.LazyUnsafeAllocatorImpl; |
| import org.apache.directmemory.memory.buffer.MemoryBuffer; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class UnsafeMemoryManagerServiceImpl<V> |
| extends AbstractMemoryManager<V> |
| implements MemoryManagerService<V> |
| { |
| |
| protected static final long NEVER_EXPIRES = 0L; |
| |
| protected static Logger logger = LoggerFactory.getLogger( MemoryManager.class ); |
| |
| private final Set<Pointer<V>> pointers = Collections.newSetFromMap( new ConcurrentHashMap<Pointer<V>, Boolean>() ); |
| |
| private Allocator allocator; |
| |
| private long capacity; |
| |
| @Override |
| public void init( int numberOfBuffers, int size ) |
| { |
| this.capacity = numberOfBuffers * size; |
| this.allocator = new LazyUnsafeAllocatorImpl( numberOfBuffers, capacity ); |
| } |
| |
| @Override |
| public void close() |
| throws IOException |
| { |
| allocator.close(); |
| used.set( 0 ); |
| } |
| |
| protected Pointer<V> instanciatePointer( int size, long expiresIn, long expires ) |
| { |
| Pointer<V> p = new PointerImpl<V>( allocator.allocate( size ), 1 ); |
| |
| p.setExpiration( expires, expiresIn ); |
| p.setFree( false ); |
| p.createdNow(); |
| |
| pointers.add( p ); |
| |
| return p; |
| } |
| |
| @Override |
| public Pointer<V> store( byte[] payload, long expiresIn ) |
| { |
| if ( capacity - used.get() - payload.length < 0 ) |
| { |
| if ( returnsNullWhenFull() ) |
| { |
| return null; |
| } |
| else |
| { |
| throw new BufferOverflowException(); |
| } |
| } |
| |
| Pointer<V> p = instanciatePointer( payload.length, expiresIn, NEVER_EXPIRES ); |
| p.getMemoryBuffer().writeBytes( payload ); |
| |
| used.addAndGet( payload.length ); |
| // 2nd version |
| // unsafe.copyMemory( srcAddress, address, payload.length ); |
| return p; |
| } |
| |
| @Override |
| public byte[] retrieve( Pointer<V> pointer ) |
| { |
| final byte[] swp = new byte[(int) pointer.getSize()]; |
| |
| MemoryBuffer memoryBuffer = pointer.getMemoryBuffer(); |
| memoryBuffer.readerIndex( 0 ); |
| memoryBuffer.readBytes( swp ); |
| |
| return swp; |
| } |
| |
| @Override |
| public Pointer<V> free( Pointer<V> pointer ) |
| { |
| used.addAndGet( -pointer.getSize() ); |
| allocator.free( pointer.getMemoryBuffer() ); |
| pointers.remove( pointer ); |
| pointer.setFree( true ); |
| return pointer; |
| } |
| |
| @Override |
| public void clear() |
| { |
| for ( Iterator<Pointer<V>> iterator = pointers.iterator(); iterator.hasNext(); ) |
| { |
| Pointer<V> pointer = iterator.next(); |
| free( pointer ); |
| } |
| } |
| |
| @Override |
| public long capacity() |
| { |
| return capacity; |
| } |
| |
| @Override |
| public long used() |
| { |
| return used.get(); |
| } |
| |
| // @Override |
| // public long collectExpired() |
| // { |
| // // TODO Auto-generated method stub |
| // return 0; |
| // } |
| // |
| // @Override |
| // public void collectLFU() |
| // { |
| // // TODO Auto-generated method stub |
| // |
| // } |
| // |
| // @Override |
| // public <T extends V> Pointer<V> allocate( Class<T> type, int size, long expiresIn, long expires ) |
| // { |
| // // TODO Auto-generated method stub |
| // return null; |
| // } |
| |
| } |