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net.spy.memcached.transcoders.WhalinV1Transcoder Maven / Gradle / Ivy
Amazon ElastiCache Cluster Client is an enhanced Java library to connect to ElastiCache clusters. This client library has been built upon Spymemcached and is released under the Amazon Software License.
/**
* Copyright (C) 2006-2009 Dustin Sallings
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING
* IN THE SOFTWARE.
*/
package net.spy.memcached.transcoders;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import net.spy.memcached.CachedData;
import net.spy.memcached.util.StringUtils;
/**
* Handles old whalin (tested with v1.6) encoding: data type is in the first
* byte of the value.
*
* @author bpartensky
* @since Oct 16, 2008
*/
public class WhalinV1Transcoder extends BaseSerializingTranscoder implements
Transcoder {
public static final int SPECIAL_BYTE = 1;
public static final int SPECIAL_BOOLEAN = 2;
public static final int SPECIAL_INTEGER = 3;
public static final int SPECIAL_LONG = 4;
public static final int SPECIAL_CHARACTER = 5;
public static final int SPECIAL_STRING = 6;
public static final int SPECIAL_STRINGBUFFER = 7;
public static final int SPECIAL_FLOAT = 8;
public static final int SPECIAL_SHORT = 9;
public static final int SPECIAL_DOUBLE = 10;
public static final int SPECIAL_DATE = 11;
public static final int SPECIAL_STRINGBUILDER = 12;
public static final int COMPRESSED = 2;
public static final int SERIALIZED = 8;
public WhalinV1Transcoder() {
super(CachedData.MAX_SIZE);
}
public CachedData encode(Object o) {
byte[] b = null;
int flags = 0;
if (o instanceof String) {
b = encodeW1String((String) o);
if (StringUtils.isJsonObject((String) o)) {
return new CachedData(flags, b, getMaxSize());
}
} else if (o instanceof StringBuffer) {
b = encodeStringBuffer((StringBuffer) o);
} else if (o instanceof StringBuilder) {
b = encodeStringbuilder((StringBuilder) o);
} else if (o instanceof Long) {
b = encodeLong((Long) o);
} else if (o instanceof Integer) {
b = encodeInteger((Integer) o);
} else if (o instanceof Short) {
b = encodeShort((Short) o);
} else if (o instanceof Boolean) {
b = encodeBoolean((Boolean) o);
} else if (o instanceof Date) {
b = encodeLong(((Date) o).getTime(), SPECIAL_DATE);
} else if (o instanceof Byte) {
b = encodeByte((Byte) o);
} else if (o instanceof Float) {
b = encodeFloat((Float) o);
} else if (o instanceof Double) {
b = encodeDouble((Double) o);
} else if (o instanceof Character) {
b = encodeCharacter((Character) o);
} else {
b = serialize(o);
flags |= SERIALIZED;
}
assert b != null;
if (b.length > compressionThreshold) {
byte[] compressed = compress(b);
if (compressed.length < b.length) {
getLogger().info("Compressed %s from %d to %d", o.getClass().getName(),
b.length, compressed.length);
b = compressed;
flags |= COMPRESSED;
} else {
getLogger().info("Compression increased the size of %s from %d to %d",
o.getClass().getName(), b.length, compressed.length);
}
}
return new CachedData(flags, b, getMaxSize());
}
public Object decode(CachedData d) {
byte[] data = d.getData();
Object rv = null;
if ((d.getFlags() & COMPRESSED) != 0) {
data = decompress(d.getData());
}
if ((d.getFlags() & SERIALIZED) != 0) {
rv = deserialize(data);
} else {
int f = data[0];
switch (f) {
case SPECIAL_BOOLEAN:
rv = decodeBoolean(data);
break;
case SPECIAL_INTEGER:
rv = decodeInteger(data);
break;
case SPECIAL_SHORT:
rv = decodeShort(data);
break;
case SPECIAL_LONG:
rv = decodeLong(data);
break;
case SPECIAL_DATE:
rv = new Date(decodeLong(data));
break;
case SPECIAL_BYTE:
rv = decodeByte(data);
break;
case SPECIAL_FLOAT:
rv = decodeFloat(data);
break;
case SPECIAL_DOUBLE:
rv = decodeDouble(data);
break;
case SPECIAL_STRING:
rv = decodeW1String(data);
break;
case SPECIAL_STRINGBUFFER:
rv = new StringBuffer(decodeW1String(data));
break;
case SPECIAL_STRINGBUILDER:
rv = new StringBuilder(decodeW1String(data));
break;
case SPECIAL_CHARACTER:
rv = decodeCharacter(data);
break;
default:
getLogger().warn("Cannot handle data with flags %x", f);
}
}
return rv;
}
private Short decodeShort(byte[] data) {
return Short.valueOf((short) decodeInteger(data).intValue());
}
private Byte decodeByte(byte[] in) {
assert in.length == 2 : "Wrong length for a byte";
byte value = in[1];
return Byte.valueOf(value);
}
private Integer decodeInteger(byte[] in) {
assert in.length == 5 : "Wrong length for an int";
return Integer.valueOf((int) decodeLong(in).longValue());
}
private Float decodeFloat(byte[] in) {
assert in.length == 5 : "Wrong length for a float";
Integer l = decodeInteger(in);
return Float.valueOf(Float.intBitsToFloat(l.intValue()));
}
private Double decodeDouble(byte[] in) {
assert in.length == 9 : "Wrong length for a double";
Long l = decodeLong(in);
return Double.valueOf(Double.longBitsToDouble(l.longValue()));
}
private Boolean decodeBoolean(byte[] in) {
assert in.length == 2 : "Wrong length for a boolean";
return Boolean.valueOf(in[1] == 1);
}
private Long decodeLong(byte[] in) {
long rv = 0L;
for (int idx = 1; idx < in.length; idx++) {
byte i = in[idx];
rv = (rv << 8) | (i < 0 ? 256 + i : i);
}
return Long.valueOf(rv);
}
private Character decodeCharacter(byte[] b) {
return Character.valueOf((char) decodeInteger(b).intValue());
}
private String decodeW1String(byte[] b) {
try {
return new String(b, 1, b.length - 1, charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
private byte[] encodeByte(Byte value) {
byte[] b = new byte[2];
b[0] = SPECIAL_BYTE;
b[1] = value.byteValue();
return b;
}
private byte[] encodeBoolean(Boolean value) {
byte[] b = new byte[2];
b[0] = SPECIAL_BOOLEAN;
b[1] = (byte) (value.booleanValue() ? 1 : 0);
return b;
}
private byte[] encodeInteger(Integer value) {
byte[] b = encodeNum(value, 4);
b[0] = SPECIAL_INTEGER;
return b;
}
private byte[] encodeLong(Long value, int type) {
byte[] b = encodeNum(value, 8);
b[0] = (byte) type;
return b;
}
private byte[] encodeLong(Long value) {
return encodeLong(value, SPECIAL_LONG);
}
private byte[] encodeShort(Short value) {
byte[] b = encodeInteger((int) value.shortValue());
b[0] = SPECIAL_SHORT;
return b;
}
private byte[] encodeFloat(Float value) {
byte[] b = encodeInteger(Float.floatToIntBits(value));
b[0] = SPECIAL_FLOAT;
return b;
}
private byte[] encodeDouble(Double value) {
byte[] b = encodeLong(Double.doubleToLongBits(value));
b[0] = SPECIAL_DOUBLE;
return b;
}
private byte[] encodeCharacter(Character value) {
byte[] result = encodeInteger((int) value.charValue());
result[0] = SPECIAL_CHARACTER;
return result;
}
private byte[] encodeStringBuffer(StringBuffer value) {
byte[] b = encodeW1String(value.toString());
b[0] = SPECIAL_STRINGBUFFER;
return b;
}
private byte[] encodeStringbuilder(StringBuilder value) {
byte[] b = encodeW1String(value.toString());
b[0] = SPECIAL_STRINGBUILDER;
return b;
}
private byte[] encodeW1String(String value) {
byte[] svalue = null;
try {
svalue = value.getBytes(charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
byte[] result = new byte[svalue.length + 1];
System.arraycopy(svalue, 0, result, 1, svalue.length);
result[0] = SPECIAL_STRING;
return result;
}
private byte[] encodeNum(long l, int maxBytes) {
byte[] rv = new byte[maxBytes + 1];
for (int i = 0; i < rv.length - 1; i++) {
int pos = rv.length - i - 1;
rv[pos] = (byte) ((l >> (8 * i)) & 0xff);
}
return rv;
}
}
