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import sun.misc.Unsafe;

import java.lang.reflect.Field;

public class JavaUS

{

private static final Unsafe unsafe;

static

{

try

{

Field field = Unsafe.class.getDeclaredField("theUnsafe");

field.setAccessible(true);

unsafe = (Unsafe)field.get(null);

}

catch (Exception e)

{

throw new RuntimeException(e);

}

}

private static final int NUM_RECORDS = 50 * 1000 * 444;

private static long address;

private static final DirectMemoryTrade flyweight = new DirectMemoryTrade();

public static void main(final String[] args)

{

for (int i = 0; i < 5; i++)

{

System.gc();

perfRun(i);

}

}

private static void perfRun(final int runNum)

{

long start = System.currentTimeMillis();

init();

long buyCost = 0;

long sellCost = 0;

for (int i = 0; i < NUM_RECORDS; i++)

{

final DirectMemoryTrade trade = get(i);

if (trade.getSide() == 'B')

{

buyCost += (trade.getPrice() * trade.getQuantity());

}

else

{

sellCost += (trade.getPrice() * trade.getQuantity());

}

}

long duration = System.currentTimeMillis() - start;

System.out.println(runNum + " - duration " + duration + "ms");

System.out.println("buyCost = " + buyCost + " sellCost = " + sellCost);

destroy();

}

private static DirectMemoryTrade get(final int index)

{

final long offset = address + (index * DirectMemoryTrade.getObjectSize());

flyweight.setObjectOffset(offset);

return flyweight;

}

public static void init()

{

final long requiredHeap = NUM_RECORDS * DirectMemoryTrade.getObjectSize();

address = unsafe.allocateMemory(requiredHeap);

for (int i = 0; i < NUM_RECORDS; i++)

{

DirectMemoryTrade trade = get(i);

trade.setTradeId(i);

trade.setClientId(1);

trade.setVenueCode(123);

trade.setInstrumentCode(321);

trade.setPrice(i);

trade.setQuantity(i);

trade.setSide((i & 1) == 0 ? 'B' : 'S');

}

}

private static void destroy()

{

unsafe.freeMemory(address);

}

private static class DirectMemoryTrade

{

private static long offset = 0;

private static final long tradeIdOffset = offset += 0;

private static final long clientIdOffset = offset += 8;

private static final long venueCodeOffset = offset += 8;

private static final long instrumentCodeOffset = offset += 4;

private static final long priceOffset = offset += 4;

private static final long quantityOffset = offset += 8;

private static final long sideOffset = offset += 8;

private static final long objectSize = offset += 2;

private long objectOffset;

public static long getObjectSize()

{

return objectSize;

}

void setObjectOffset(final long objectOffset)

{

this.objectOffset = objectOffset;

}

public long getTradeId()

{

return unsafe.getLong(objectOffset + tradeIdOffset);

}

public void setTradeId(final long tradeId)

{

unsafe.putLong(objectOffset + tradeIdOffset, tradeId);

}

public long getClientId()

{

return unsafe.getLong(objectOffset + clientIdOffset);

}

public void setClientId(final long clientId)

{

unsafe.putLong(objectOffset + clientIdOffset, clientId);

}

public int getVenueCode()

{

return unsafe.getInt(objectOffset + venueCodeOffset);

}

public void setVenueCode(final int venueCode)

{

unsafe.putInt(objectOffset + venueCodeOffset, venueCode);

}

public int getInstrumentCode()

{

return unsafe.getInt(objectOffset + instrumentCodeOffset);

}

public void setInstrumentCode(final int instrumentCode)

{

unsafe.putInt(objectOffset + instrumentCodeOffset, instrumentCode);

}

public long getPrice()

{

return unsafe.getLong(objectOffset + priceOffset);

}

public void setPrice(final long price)

{

unsafe.putLong(objectOffset + priceOffset, price);

}

public long getQuantity()

{

return unsafe.getLong(objectOffset + quantityOffset);

}

public void setQuantity(final long quantity)

{

unsafe.putLong(objectOffset + quantityOffset, quantity);

}

public char getSide()

{

return unsafe.getChar(objectOffset + sideOffset);

}

public void setSide(final char side)

{

unsafe.putChar(objectOffset + sideOffset, side);

}

}

}