Examples of org.apache.directmemory.memory.allocator.MergingByteBufferAllocatorImpl

org.apache.directmemory.memory.allocator.MergingByteBufferAllocatorImpl

{@link ByteBufferAllocator} implementation with {@link ByteBuffer} merging capabilities.

{@link ByteBuffer}s are wrapped into an {@link LinkedByteBuffer}, and when a {@link ByteBuffer} is freed,lookup is done to the neighbor to check if they are also free, in which case they are merged.

{@link #setMinSizeThreshold(int)} gives the minimum buffer's size under which no splitting is done.{@link #setSizeRatioThreshold(double)} gives the size ratio (requested allocation / free buffer's size} under which no splitting is done

The free {@link ByteBuffer} are held into a {@link NavigableMap} with keys defining the size's range : 0 -> first key (included), first key -> second key (included), ...Instead of keeping a list of {@link ByteBuffer}s sorted by capacity, {@link ByteBuffer}s in the same size's range are held in the same collection. The size's range are computed by {@link #generateFreeSizesRange(Integer)} and can be overridden. @since 0.6

        logger.info( "************************************************" );
    }
    
    public void rawInsert( int megabytes, int howMany )
    {
        ByteBufferAllocator allocator = new MergingByteBufferAllocatorImpl( 1, megabytes * 1024 * 1024 );
        assertNotNull( allocator );
        int size = allocator.getCapacity() / ( howMany );
        size -= size / 100 * 1;
        logger.info( "payload size=" + size );
        logger.info( "entries=" + howMany );


        logger.info( "starting..." );


        long start = System.currentTimeMillis();


        for ( int i = 0; i < howMany; i++ )
        {
            allocator.allocate( size );
        }


        logger.info( "...done in " + ( System.currentTimeMillis() - start ) + " msecs." );
        logger.info( "---------------------------------" );
        dump( allocator );

    }




    protected ByteBufferAllocator instanciateByteBufferAllocator( final int allocatorNumber, final int size )
    {
        final MergingByteBufferAllocatorImpl allocator = new MergingByteBufferAllocatorImpl( allocatorNumber, size );


        // Hack to ensure the pointers are always split to keep backward compatibility.
        allocator.setMinSizeThreshold( 0 );
        allocator.setSizeRatioThreshold( 1.0 );


        return allocator;
    }

Examples of org.apache.directmemory.memory.allocator.MergingByteBufferAllocatorImpl

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