| 1 | package net.spy.memcached.protocol.binary; |
| 2 | |
| 3 | import static net.spy.memcached.protocol.binary.GetOperationImpl.EXTRA_HDR_LEN; |
| 4 | |
| 5 | import java.io.IOException; |
| 6 | import java.nio.ByteBuffer; |
| 7 | import java.util.Collection; |
| 8 | import java.util.HashMap; |
| 9 | import java.util.HashSet; |
| 10 | import java.util.Map; |
| 11 | |
| 12 | import net.spy.memcached.KeyUtil; |
| 13 | import net.spy.memcached.ops.GetOperation; |
| 14 | import net.spy.memcached.ops.OperationCallback; |
| 15 | import net.spy.memcached.ops.OperationState; |
| 16 | |
| 17 | class MultiGetOperationImpl extends OperationImpl implements GetOperation { |
| 18 | |
| 19 | private static final int CMD_GETQ=9; |
| 20 | |
| 21 | private final Map<Integer, String> keys=new HashMap<Integer, String>(); |
| 22 | private final Map<Integer, byte[]> bkeys=new HashMap<Integer, byte[]>(); |
| 23 | private final Map<String, Integer> rkeys=new HashMap<String, Integer>(); |
| 24 | |
| 25 | private final int terminalOpaque=generateOpaque(); |
| 26 | |
| 27 | public MultiGetOperationImpl(Collection<String> k, OperationCallback cb) { |
| 28 | super(-1, -1, cb); |
| 29 | for(String s : new HashSet<String>(k)) { |
| 30 | addKey(s); |
| 31 | } |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * Add a key (and return its new opaque value). |
| 36 | */ |
| 37 | protected int addKey(String k) { |
| 38 | Integer rv=rkeys.get(k); |
| 39 | if(rv == null) { |
| 40 | rv=generateOpaque(); |
| 41 | keys.put(rv, k); |
| 42 | bkeys.put(rv, KeyUtil.getKeyBytes(k)); |
| 43 | rkeys.put(k, rv); |
| 44 | } |
| 45 | return rv; |
| 46 | } |
| 47 | |
| 48 | @Override |
| 49 | public void initialize() { |
| 50 | int size=(1+keys.size()) * MIN_RECV_PACKET; |
| 51 | for(byte[] b : bkeys.values()) { |
| 52 | size += b.length; |
| 53 | } |
| 54 | // set up the initial header stuff |
| 55 | ByteBuffer bb=ByteBuffer.allocate(size); |
| 56 | for(Map.Entry<Integer, byte[]> me : bkeys.entrySet()) { |
| 57 | final byte[] keyBytes=me.getValue(); |
| 58 | |
| 59 | // Custom header |
| 60 | bb.put(REQ_MAGIC); |
| 61 | bb.put((byte)CMD_GETQ); |
| 62 | bb.putShort((short)keyBytes.length); |
| 63 | bb.put((byte)0); // extralen |
| 64 | bb.put((byte)0); // data type |
| 65 | bb.putShort((short)0); // reserved |
| 66 | bb.putInt(keyBytes.length); |
| 67 | bb.putInt(me.getKey()); |
| 68 | bb.putLong(0); // cas |
| 69 | // the actual key |
| 70 | bb.put(keyBytes); |
| 71 | } |
| 72 | // Add the noop |
| 73 | bb.put(REQ_MAGIC); |
| 74 | bb.put((byte)NoopOperationImpl.CMD); |
| 75 | bb.putShort((short)0); |
| 76 | bb.put((byte)0); // extralen |
| 77 | bb.put((byte)0); // data type |
| 78 | bb.putShort((short)0); // reserved |
| 79 | bb.putInt(0); |
| 80 | bb.putInt(terminalOpaque); |
| 81 | bb.putLong(0); // cas |
| 82 | |
| 83 | bb.flip(); |
| 84 | setBuffer(bb); |
| 85 | } |
| 86 | |
| 87 | @Override |
| 88 | protected void finishedPayload(byte[] pl) throws IOException { |
| 89 | if(responseOpaque == terminalOpaque) { |
| 90 | getCallback().receivedStatus(STATUS_OK); |
| 91 | transitionState(OperationState.COMPLETE); |
| 92 | } else if(errorCode != 0) { |
| 93 | getLogger().warn("Error on key %s: %s (%d)", |
| 94 | keys.get(responseOpaque), new String(pl), errorCode); |
| 95 | } else { |
| 96 | final int flags=decodeInt(pl, 0); |
| 97 | final byte[] data=new byte[pl.length - EXTRA_HDR_LEN]; |
| 98 | System.arraycopy(pl, EXTRA_HDR_LEN, data, |
| 99 | 0, pl.length-EXTRA_HDR_LEN); |
| 100 | Callback cb=(Callback)getCallback(); |
| 101 | cb.gotData(keys.get(responseOpaque), flags, data); |
| 102 | } |
| 103 | resetInput(); |
| 104 | } |
| 105 | |
| 106 | @Override |
| 107 | protected boolean opaqueIsValid() { |
| 108 | return responseOpaque == terminalOpaque |
| 109 | || keys.containsKey(responseOpaque); |
| 110 | } |
| 111 | |
| 112 | public Collection<String> getKeys() { |
| 113 | return keys.values(); |
| 114 | } |
| 115 | |
| 116 | } |