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BaseSerializingTranscoder.java
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BaseSerializingTranscoder.java
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/**
* Copyright (C) 2006-2009 Dustin Sallings
* Copyright (C) 2009-2011 Couchbase, Inc.
*
* 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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.UnsupportedEncodingException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import net.spy.memcached.CachedData;
import net.spy.memcached.compat.CloseUtil;
import net.spy.memcached.compat.SpyObject;
/**
* Base class for any transcoders that may want to work with serialized or
* compressed data.
*/
public abstract class BaseSerializingTranscoder extends SpyObject {
/**
* Default compression threshold value.
*/
public static final int DEFAULT_COMPRESSION_THRESHOLD = 16384;
private static final String DEFAULT_CHARSET = "UTF-8";
protected int compressionThreshold = DEFAULT_COMPRESSION_THRESHOLD;
protected String charset = DEFAULT_CHARSET;
private final int maxSize;
/**
* Initialize a serializing transcoder with the given maximum data size.
*/
public BaseSerializingTranscoder(int max) {
super();
maxSize = max;
}
public boolean asyncDecode(CachedData d) {
return false;
}
/**
* Set the compression threshold to the given number of bytes. This transcoder
* will attempt to compress any data being stored that's larger than this.
*
* @param to the number of bytes
*/
public void setCompressionThreshold(int to) {
compressionThreshold = to;
}
/**
* Set the character set for string value transcoding (defaults to UTF-8).
*/
public void setCharset(String to) {
// Validate the character set.
try {
new String(new byte[97], to);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
charset = to;
}
/**
* Get the bytes representing the given serialized object.
*/
protected byte[] serialize(Object o) {
if (o == null) {
throw new NullPointerException("Can't serialize null");
}
byte[] rv=null;
ByteArrayOutputStream bos = null;
ObjectOutputStream os = null;
try {
bos = new ByteArrayOutputStream();
os = new ObjectOutputStream(bos);
os.writeObject(o);
os.close();
bos.close();
rv = bos.toByteArray();
} catch (IOException e) {
throw new IllegalArgumentException("Non-serializable object", e);
} finally {
CloseUtil.close(os);
CloseUtil.close(bos);
}
return rv;
}
/**
* Get the object represented by the given serialized bytes.
*/
protected Object deserialize(byte[] in) {
Object rv=null;
ByteArrayInputStream bis = null;
ObjectInputStream is = null;
try {
if(in != null) {
bis=new ByteArrayInputStream(in);
is=new ObjectInputStream(bis);
rv=is.readObject();
is.close();
bis.close();
}
} catch (IOException e) {
getLogger().warn("Caught IOException decoding %d bytes of data",
in == null ? 0 : in.length, e);
} catch (ClassNotFoundException e) {
getLogger().warn("Caught CNFE decoding %d bytes of data",
in == null ? 0 : in.length, e);
} finally {
CloseUtil.close(is);
CloseUtil.close(bis);
}
return rv;
}
/**
* Compress the given array of bytes.
*/
protected byte[] compress(byte[] in) {
if (in == null) {
throw new NullPointerException("Can't compress null");
}
ByteArrayOutputStream bos = new ByteArrayOutputStream();
GZIPOutputStream gz = null;
try {
gz = new GZIPOutputStream(bos);
gz.write(in);
} catch (IOException e) {
throw new RuntimeException("IO exception compressing data", e);
} finally {
CloseUtil.close(gz);
CloseUtil.close(bos);
}
byte[] rv = bos.toByteArray();
getLogger().debug("Compressed %d bytes to %d", in.length, rv.length);
return rv;
}
/**
* Decompress the given array of bytes.
*
* @return null if the bytes cannot be decompressed
*/
protected byte[] decompress(byte[] in) {
ByteArrayOutputStream bos = null;
if(in != null) {
ByteArrayInputStream bis = new ByteArrayInputStream(in);
bos = new ByteArrayOutputStream();
GZIPInputStream gis = null;
try {
gis = new GZIPInputStream(bis);
byte[] buf = new byte[8192];
int r = -1;
while ((r = gis.read(buf)) > 0) {
bos.write(buf, 0, r);
}
} catch (IOException e) {
getLogger().warn("Failed to decompress data", e);
bos = null;
} finally {
CloseUtil.close(gis);
CloseUtil.close(bis);
CloseUtil.close(bos);
}
}
return bos == null ? null : bos.toByteArray();
}
/**
* Decode the string with the current character set.
*/
protected String decodeString(byte[] data) {
String rv = null;
try {
if (data != null) {
rv = new String(data, charset);
}
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
return rv;
}
/**
* Encode a string into the current character set.
*/
protected byte[] encodeString(String in) {
byte[] rv = null;
try {
rv = in.getBytes(charset);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
return rv;
}
public int getMaxSize() {
return maxSize;
}
}