/*
* Copyright 2002-2013 SCOOP Software GmbH
*
* 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 de.scoopgmbh.copper.monitoring.core.data;
import java.util.HashMap;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.Serializer;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
import com.esotericsoftware.kryo.serializers.FieldSerializer;
import de.scoopgmbh.copper.monitoring.core.model.MeasurePointData;
/**
* We use Kryo instead of java serialization to create small serialized output
* @return
*/
public class SerializeUtil{
private static Kryo kryo;
public static Kryo createKryo(){
kryo = new Kryo();
FieldSerializer<MeasurePointData> someClassSerializer = new FieldSerializer<MeasurePointData>(kryo, MeasurePointData.class);
someClassSerializer.getField("measurePointId").setSerializer(new MeasurePointIdSerializer());
kryo.register(MeasurePointData.class, someClassSerializer);
return kryo;
}
/**
* Measure points have often same id, to save space the id is only saved once
*
*/
public static class MeasurePointIdSerializer extends Serializer<String> {
HashMap<Integer,String> keyToString = new HashMap<Integer,String>();
HashMap<String,Integer> stringToKey = new HashMap<String,Integer>();
{
setImmutable(true);
setAcceptsNull(true);
}
@Override
public void write (Kryo kryo, Output output, String object) {
if (stringToKey.containsKey(object)){
output.writeInt(stringToKey.get(object));
} else {
output.writeInt(-1);
output.writeString(object);
stringToKey.put(object,stringToKey.size());
}
}
@Override
public String read (Kryo kryo, Input input, Class<String> type) {
int key = input.readInt();
if (key==-1){
final String string = input.readString();
keyToString.put(keyToString.size(),string);
return string;
} else {
return keyToString.get(key);
}
}
}
}