| 1 | package net.spy.memcached.protocol.binary; |
| 2 | |
| 3 | import java.util.Collection; |
| 4 | import java.util.Collections; |
| 5 | |
| 6 | import net.spy.memcached.ops.MutatorOperation; |
| 7 | import net.spy.memcached.ops.Mutator; |
| 8 | import net.spy.memcached.ops.OperationCallback; |
| 9 | import net.spy.memcached.ops.OperationStatus; |
| 10 | |
| 11 | class MutatorOperationImpl extends OperationImpl implements |
| 12 | MutatorOperation { |
| 13 | |
| 14 | private static final int CMD_INCR=5; |
| 15 | private static final int CMD_DECR=6; |
| 16 | |
| 17 | private final Mutator mutator; |
| 18 | private final String key; |
| 19 | private final long by; |
| 20 | private final int exp; |
| 21 | private final long def; |
| 22 | |
| 23 | public MutatorOperationImpl(Mutator m, String k, long b, |
| 24 | long d, int e, OperationCallback cb) { |
| 25 | super(m == Mutator.incr ? CMD_INCR : CMD_DECR, generateOpaque(), cb); |
| 26 | assert d >= 0 : "Default value is below zero"; |
| 27 | mutator=m; |
| 28 | key=k; |
| 29 | by=b; |
| 30 | exp=e; |
| 31 | def=d; |
| 32 | } |
| 33 | |
| 34 | @Override |
| 35 | public void initialize() { |
| 36 | // We're passing around a long so we can cover an unsigned integer. |
| 37 | byte[] defBytes=new byte[8]; |
| 38 | defBytes[0]=(byte)((def >> 56) & 0xff); |
| 39 | defBytes[1]=(byte)((def >> 48) & 0xff); |
| 40 | defBytes[2]=(byte)((def >> 40) & 0xff); |
| 41 | defBytes[3]=(byte)((def >> 32) & 0xff); |
| 42 | defBytes[4]=(byte)((def >> 24) & 0xff); |
| 43 | defBytes[5]=(byte)((def >> 16) & 0xff); |
| 44 | defBytes[6]=(byte)((def >> 8) & 0xff); |
| 45 | defBytes[7]=(byte)(def & 0xff); |
| 46 | prepareBuffer(key, 0, EMPTY_BYTES, by, defBytes, exp); |
| 47 | } |
| 48 | |
| 49 | @Override |
| 50 | protected OperationStatus getStatusForErrorCode(int errCode, byte[] errPl) { |
| 51 | return errCode == ERR_NOT_FOUND ? NOT_FOUND_STATUS : null; |
| 52 | } |
| 53 | |
| 54 | @Override |
| 55 | protected void decodePayload(byte[] pl) { |
| 56 | getCallback().receivedStatus(new OperationStatus(true, |
| 57 | String.valueOf(decodeLong(pl, 0)))); |
| 58 | } |
| 59 | |
| 60 | public Collection<String> getKeys() { |
| 61 | return Collections.singleton(key); |
| 62 | } |
| 63 | |
| 64 | public int getBy() { |
| 65 | return (int) by; |
| 66 | } |
| 67 | |
| 68 | public long getDefault() { |
| 69 | return def; |
| 70 | } |
| 71 | |
| 72 | public int getExpiration() { |
| 73 | return exp; |
| 74 | } |
| 75 | |
| 76 | public Mutator getType() { |
| 77 | return mutator; |
| 78 | } |
| 79 | |
| 80 | } |