| 1 | package net.spy.memcached.transcoders; |
| 2 | |
| 3 | import java.util.Date; |
| 4 | |
| 5 | import net.spy.memcached.CachedData; |
| 6 | |
| 7 | /** |
| 8 | * Transcoder that provides compatibility with Greg Whalin's memcached client. |
| 9 | */ |
| 10 | public class WhalinTranscoder extends BaseSerializingTranscoder |
| 11 | implements Transcoder<Object> { |
| 12 | |
| 13 | static final int SPECIAL_BYTE = 1; |
| 14 | static final int SPECIAL_BOOLEAN = 8192; |
| 15 | static final int SPECIAL_INT = 4; |
| 16 | static final int SPECIAL_LONG = 16384; |
| 17 | static final int SPECIAL_CHARACTER = 16; |
| 18 | static final int SPECIAL_STRING = 32; |
| 19 | static final int SPECIAL_STRINGBUFFER = 64; |
| 20 | static final int SPECIAL_FLOAT = 128; |
| 21 | static final int SPECIAL_SHORT = 256; |
| 22 | static final int SPECIAL_DOUBLE = 512; |
| 23 | static final int SPECIAL_DATE = 1024; |
| 24 | static final int SPECIAL_STRINGBUILDER = 2048; |
| 25 | static final int SPECIAL_BYTEARRAY = 4096; |
| 26 | static final int COMPRESSED = 2; |
| 27 | static final int SERIALIZED = 8; |
| 28 | |
| 29 | private final TranscoderUtils tu=new TranscoderUtils(false); |
| 30 | |
| 31 | public WhalinTranscoder() { |
| 32 | super(CachedData.MAX_SIZE); |
| 33 | } |
| 34 | |
| 35 | /* (non-Javadoc) |
| 36 | * @see net.spy.memcached.Transcoder#decode(net.spy.memcached.CachedData) |
| 37 | */ |
| 38 | public Object decode(CachedData d) { |
| 39 | byte[] data=d.getData(); |
| 40 | Object rv=null; |
| 41 | if((d.getFlags() & COMPRESSED) != 0) { |
| 42 | data=decompress(d.getData()); |
| 43 | } |
| 44 | if((d.getFlags() & SERIALIZED) != 0) { |
| 45 | rv=deserialize(data); |
| 46 | } else { |
| 47 | int f=d.getFlags() & ~COMPRESSED; |
| 48 | switch(f) { |
| 49 | case SPECIAL_BOOLEAN: |
| 50 | rv=Boolean.valueOf(this.decodeBoolean(data)); |
| 51 | break; |
| 52 | case SPECIAL_INT: |
| 53 | rv=new Integer(tu.decodeInt(data)); |
| 54 | break; |
| 55 | case SPECIAL_SHORT: |
| 56 | rv=new Short((short)tu.decodeInt(data)); |
| 57 | break; |
| 58 | case SPECIAL_LONG: |
| 59 | rv=new Long(tu.decodeLong(data)); |
| 60 | break; |
| 61 | case SPECIAL_DATE: |
| 62 | rv=new Date(tu.decodeLong(data)); |
| 63 | break; |
| 64 | case SPECIAL_BYTE: |
| 65 | rv=new Byte(tu.decodeByte(data)); |
| 66 | break; |
| 67 | case SPECIAL_FLOAT: |
| 68 | rv=new Float(Float.intBitsToFloat(tu.decodeInt(data))); |
| 69 | break; |
| 70 | case SPECIAL_DOUBLE: |
| 71 | rv=new Double(Double.longBitsToDouble(tu.decodeLong(data))); |
| 72 | break; |
| 73 | case SPECIAL_BYTEARRAY: |
| 74 | rv=data; |
| 75 | break; |
| 76 | case SPECIAL_STRING: |
| 77 | rv = decodeString(data); |
| 78 | break; |
| 79 | case SPECIAL_STRINGBUFFER: |
| 80 | rv=new StringBuffer(decodeString(data)); |
| 81 | break; |
| 82 | case SPECIAL_STRINGBUILDER: |
| 83 | rv=new StringBuilder(decodeString(data)); |
| 84 | break; |
| 85 | case SPECIAL_CHARACTER: |
| 86 | rv = decodeCharacter(data); |
| 87 | break; |
| 88 | default: |
| 89 | getLogger().warn("Cannot handle data with flags %x", f); |
| 90 | } |
| 91 | } |
| 92 | return rv; |
| 93 | } |
| 94 | |
| 95 | public CachedData encode(Object o) { |
| 96 | byte[] b=null; |
| 97 | int flags=0; |
| 98 | if(o instanceof String) { |
| 99 | b=encodeString((String)o); |
| 100 | flags |= SPECIAL_STRING; |
| 101 | } else if(o instanceof StringBuffer) { |
| 102 | flags |= SPECIAL_STRINGBUFFER; |
| 103 | b=encodeString(String.valueOf(o)); |
| 104 | } else if(o instanceof StringBuilder) { |
| 105 | flags |= SPECIAL_STRINGBUILDER; |
| 106 | b=encodeString(String.valueOf(o)); |
| 107 | } else if(o instanceof Long) { |
| 108 | b=tu.encodeLong((Long)o); |
| 109 | flags |= SPECIAL_LONG; |
| 110 | } else if(o instanceof Integer) { |
| 111 | b=tu.encodeInt((Integer)o); |
| 112 | flags |= SPECIAL_INT; |
| 113 | } else if(o instanceof Short) { |
| 114 | b=tu.encodeInt((Short)o); |
| 115 | flags |= SPECIAL_SHORT; |
| 116 | } else if(o instanceof Boolean) { |
| 117 | b=this.encodeBoolean((Boolean)o); |
| 118 | flags |= SPECIAL_BOOLEAN; |
| 119 | } else if(o instanceof Date) { |
| 120 | b=tu.encodeLong(((Date)o).getTime()); |
| 121 | flags |= SPECIAL_DATE; |
| 122 | } else if(o instanceof Byte) { |
| 123 | b=tu.encodeByte((Byte)o); |
| 124 | flags |= SPECIAL_BYTE; |
| 125 | } else if(o instanceof Float) { |
| 126 | b=tu.encodeInt(Float.floatToIntBits((Float)o)); |
| 127 | flags |= SPECIAL_FLOAT; |
| 128 | } else if(o instanceof Double) { |
| 129 | b=tu.encodeLong(Double.doubleToLongBits((Double)o)); |
| 130 | flags |= SPECIAL_DOUBLE; |
| 131 | } else if(o instanceof byte[]) { |
| 132 | b=(byte[])o; |
| 133 | flags |= SPECIAL_BYTEARRAY; |
| 134 | } else if (o instanceof Character) { |
| 135 | b = tu.encodeInt((Character) o); |
| 136 | flags |= SPECIAL_CHARACTER; |
| 137 | } else { |
| 138 | b=serialize(o); |
| 139 | flags |= SERIALIZED; |
| 140 | } |
| 141 | assert b != null; |
| 142 | if(b.length > compressionThreshold) { |
| 143 | byte[] compressed=compress(b); |
| 144 | if(compressed.length < b.length) { |
| 145 | getLogger().info("Compressed %s from %d to %d", |
| 146 | o.getClass().getName(), b.length, compressed.length); |
| 147 | b=compressed; |
| 148 | flags |= COMPRESSED; |
| 149 | } else { |
| 150 | getLogger().info( |
| 151 | "Compression increased the size of %s from %d to %d", |
| 152 | o.getClass().getName(), b.length, compressed.length); |
| 153 | } |
| 154 | } |
| 155 | return new CachedData(flags, b, getMaxSize()); |
| 156 | } |
| 157 | |
| 158 | protected Character decodeCharacter(byte[] b){ |
| 159 | return Character.valueOf((char)tu.decodeInt(b)); |
| 160 | } |
| 161 | |
| 162 | public byte[] encodeBoolean(boolean b){ |
| 163 | byte[] rv = new byte[1]; |
| 164 | rv[0] = (byte) (b ? 1 : 0); |
| 165 | return rv; |
| 166 | } |
| 167 | |
| 168 | public boolean decodeBoolean(byte[] in) { |
| 169 | assert in.length == 1 : "Wrong length for a boolean"; |
| 170 | return in[0] == 1; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | } |