| 1 | // Copyright (c) 2006 Dustin Sallings <dustin@spy.net> |
| 2 | |
| 3 | package net.spy.memcached.transcoders; |
| 4 | |
| 5 | import java.util.Date; |
| 6 | |
| 7 | import net.spy.memcached.CachedData; |
| 8 | |
| 9 | /** |
| 10 | * Transcoder that serializes and compresses objects. |
| 11 | */ |
| 12 | public class SerializingTranscoder extends BaseSerializingTranscoder |
| 13 | implements Transcoder<Object> { |
| 14 | |
| 15 | // General flags |
| 16 | static final int SERIALIZED=1; |
| 17 | static final int COMPRESSED=2; |
| 18 | |
| 19 | // Special flags for specially handled types. |
| 20 | private static final int SPECIAL_MASK=0xff00; |
| 21 | static final int SPECIAL_BOOLEAN=(1<<8); |
| 22 | static final int SPECIAL_INT=(2<<8); |
| 23 | static final int SPECIAL_LONG=(3<<8); |
| 24 | static final int SPECIAL_DATE=(4<<8); |
| 25 | static final int SPECIAL_BYTE=(5<<8); |
| 26 | static final int SPECIAL_FLOAT=(6<<8); |
| 27 | static final int SPECIAL_DOUBLE=(7<<8); |
| 28 | static final int SPECIAL_BYTEARRAY=(8<<8); |
| 29 | |
| 30 | private final TranscoderUtils tu=new TranscoderUtils(true); |
| 31 | |
| 32 | /** |
| 33 | * Get a serializing transcoder with the default max data size. |
| 34 | */ |
| 35 | public SerializingTranscoder() { |
| 36 | this(CachedData.MAX_SIZE); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * Get a serializing transcoder that specifies the max data size. |
| 41 | */ |
| 42 | public SerializingTranscoder(int max) { |
| 43 | super(max); |
| 44 | } |
| 45 | |
| 46 | @Override |
| 47 | public boolean asyncDecode(CachedData d) { |
| 48 | if((d.getFlags() & COMPRESSED) != 0 |
| 49 | || (d.getFlags() & SERIALIZED) != 0 ) { |
| 50 | return true; |
| 51 | } |
| 52 | return super.asyncDecode(d); |
| 53 | } |
| 54 | |
| 55 | /* (non-Javadoc) |
| 56 | * @see net.spy.memcached.Transcoder#decode(net.spy.memcached.CachedData) |
| 57 | */ |
| 58 | public Object decode(CachedData d) { |
| 59 | byte[] data=d.getData(); |
| 60 | Object rv=null; |
| 61 | if((d.getFlags() & COMPRESSED) != 0) { |
| 62 | data=decompress(d.getData()); |
| 63 | } |
| 64 | int flags=d.getFlags() & SPECIAL_MASK; |
| 65 | if((d.getFlags() & SERIALIZED) != 0 && data != null) { |
| 66 | rv=deserialize(data); |
| 67 | } else if(flags != 0 && data != null) { |
| 68 | switch(flags) { |
| 69 | case SPECIAL_BOOLEAN: |
| 70 | rv=Boolean.valueOf(tu.decodeBoolean(data)); |
| 71 | break; |
| 72 | case SPECIAL_INT: |
| 73 | rv=new Integer(tu.decodeInt(data)); |
| 74 | break; |
| 75 | case SPECIAL_LONG: |
| 76 | rv=new Long(tu.decodeLong(data)); |
| 77 | break; |
| 78 | case SPECIAL_DATE: |
| 79 | rv=new Date(tu.decodeLong(data)); |
| 80 | break; |
| 81 | case SPECIAL_BYTE: |
| 82 | rv=new Byte(tu.decodeByte(data)); |
| 83 | break; |
| 84 | case SPECIAL_FLOAT: |
| 85 | rv=new Float(Float.intBitsToFloat(tu.decodeInt(data))); |
| 86 | break; |
| 87 | case SPECIAL_DOUBLE: |
| 88 | rv=new Double(Double.longBitsToDouble(tu.decodeLong(data))); |
| 89 | break; |
| 90 | case SPECIAL_BYTEARRAY: |
| 91 | rv=data; |
| 92 | break; |
| 93 | default: |
| 94 | getLogger().warn("Undecodeable with flags %x", flags); |
| 95 | } |
| 96 | } else { |
| 97 | rv=decodeString(data); |
| 98 | } |
| 99 | return rv; |
| 100 | } |
| 101 | |
| 102 | /* (non-Javadoc) |
| 103 | * @see net.spy.memcached.Transcoder#encode(java.lang.Object) |
| 104 | */ |
| 105 | public CachedData encode(Object o) { |
| 106 | byte[] b=null; |
| 107 | int flags=0; |
| 108 | if(o instanceof String) { |
| 109 | b=encodeString((String)o); |
| 110 | } else if(o instanceof Long) { |
| 111 | b=tu.encodeLong((Long)o); |
| 112 | flags |= SPECIAL_LONG; |
| 113 | } else if(o instanceof Integer) { |
| 114 | b=tu.encodeInt((Integer)o); |
| 115 | flags |= SPECIAL_INT; |
| 116 | } else if(o instanceof Boolean) { |
| 117 | b=tu.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.floatToRawIntBits((Float)o)); |
| 127 | flags |= SPECIAL_FLOAT; |
| 128 | } else if(o instanceof Double) { |
| 129 | b=tu.encodeLong(Double.doubleToRawLongBits((Double)o)); |
| 130 | flags |= SPECIAL_DOUBLE; |
| 131 | } else if(o instanceof byte[]) { |
| 132 | b=(byte[])o; |
| 133 | flags |= SPECIAL_BYTEARRAY; |
| 134 | } else { |
| 135 | b=serialize(o); |
| 136 | flags |= SERIALIZED; |
| 137 | } |
| 138 | assert b != null; |
| 139 | if(b.length > compressionThreshold) { |
| 140 | byte[] compressed=compress(b); |
| 141 | if(compressed.length < b.length) { |
| 142 | getLogger().info("Compressed %s from %d to %d", |
| 143 | o.getClass().getName(), b.length, compressed.length); |
| 144 | b=compressed; |
| 145 | flags |= COMPRESSED; |
| 146 | } else { |
| 147 | getLogger().info( |
| 148 | "Compression increased the size of %s from %d to %d", |
| 149 | o.getClass().getName(), b.length, compressed.length); |
| 150 | } |
| 151 | } |
| 152 | return new CachedData(flags, b, getMaxSize()); |
| 153 | } |
| 154 | |
| 155 | } |