| 1 | // Copyright (c) 2006 Dustin Sallings <dustin@spy.net> |
| 2 | |
| 3 | package net.spy.memcached.protocol.ascii; |
| 4 | |
| 5 | import java.nio.ByteBuffer; |
| 6 | import java.util.Collection; |
| 7 | import java.util.Collections; |
| 8 | |
| 9 | import net.spy.memcached.KeyUtil; |
| 10 | import net.spy.memcached.ops.DeleteOperation; |
| 11 | import net.spy.memcached.ops.OperationCallback; |
| 12 | import net.spy.memcached.ops.OperationState; |
| 13 | import net.spy.memcached.ops.OperationStatus; |
| 14 | |
| 15 | /** |
| 16 | * Operation to delete an item from the cache. |
| 17 | */ |
| 18 | final class DeleteOperationImpl extends OperationImpl |
| 19 | implements DeleteOperation { |
| 20 | |
| 21 | private static final int OVERHEAD=32; |
| 22 | |
| 23 | private static final OperationStatus DELETED= |
| 24 | new OperationStatus(true, "DELETED"); |
| 25 | private static final OperationStatus NOT_FOUND= |
| 26 | new OperationStatus(false, "NOT_FOUND"); |
| 27 | |
| 28 | private final String key; |
| 29 | |
| 30 | public DeleteOperationImpl(String k, OperationCallback cb) { |
| 31 | super(cb); |
| 32 | key=k; |
| 33 | } |
| 34 | |
| 35 | @Override |
| 36 | public void handleLine(String line) { |
| 37 | getLogger().debug("Delete of %s returned %s", key, line); |
| 38 | getCallback().receivedStatus(matchStatus(line, DELETED, NOT_FOUND)); |
| 39 | transitionState(OperationState.COMPLETE); |
| 40 | } |
| 41 | |
| 42 | @Override |
| 43 | public void initialize() { |
| 44 | ByteBuffer b=ByteBuffer.allocate( |
| 45 | KeyUtil.getKeyBytes(key).length + OVERHEAD); |
| 46 | setArguments(b, "delete", key); |
| 47 | b.flip(); |
| 48 | setBuffer(b); |
| 49 | } |
| 50 | |
| 51 | public Collection<String> getKeys() { |
| 52 | return Collections.singleton(key); |
| 53 | } |
| 54 | |
| 55 | } |