ml.shifu.guagua.io.BytableSerializer Maven / Gradle / Ivy
/**
* Copyright [2013-2014] eBay Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ml.shifu.guagua.io;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Arrays;
import ml.shifu.guagua.GuaguaRuntimeException;
import ml.shifu.guagua.util.ReflectionUtils;
/**
* {@link BytableSerializer} is used to write {@link Bytable} object to bytes and read bytes to {@link Bytable} object.
*
*
* This is the default serializer for guagua.
*/
public class BytableSerializer implements Serializer {
/**
* Serialize from object to bytes.
*
* @throws NullPointerException
* if result is null.
* @throws GuaguaRuntimeException
* if any io exception.
*/
@Override
public byte[] objectToBytes(RESULT result) {
ByteArrayOutputStream out = null;
DataOutputStream dataOut = null;
try {
out = new ByteArrayOutputStream();
dataOut = new DataOutputStream(out);
result.write(dataOut);
} catch (IOException e) {
throw new GuaguaRuntimeException(e);
} finally {
if(dataOut != null) {
try {
dataOut.close();
} catch (IOException e) {
throw new GuaguaRuntimeException(e);
}
}
}
return out.toByteArray();
}
/**
* De-serialize from bytes to object. One should provide the class name before de-serializing the object.
*
* @throws NullPointerException
* if className or data is null.
* @throws GuaguaRuntimeException
* if any io exception or other reflection exception.
*/
@Override
public RESULT bytesToObject(byte[] data, String className) {
if(data == null || className == null) {
throw new NullPointerException(String.format(
"data and className should not be null. data:%s, className:%s", Arrays.toString(data), className));
}
@SuppressWarnings("unchecked")
RESULT result = (RESULT) ReflectionUtils.newInstance(className);
DataInputStream dataIn = null;
try {
ByteArrayInputStream in = new ByteArrayInputStream(data);
dataIn = new DataInputStream(in);
result.readFields(dataIn);
} catch (Exception e) {
throw new GuaguaRuntimeException(e);
} finally {
if(dataIn != null) {
try {
dataIn.close();
} catch (IOException e) {
throw new GuaguaRuntimeException(e);
}
}
}
return result;
}
}