/*
* Copyright 2013, The Sporting Exchange Limited
*
* 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 com.betfair.cougar.netutil.nio.hessian;
import com.betfair.cougar.core.api.transcription.TranscribableParams;
import com.caucho.hessian.io.Deserializer;
import com.caucho.hessian.io.HessianProtocolException;
import com.caucho.hessian.io.SerializerFactory;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
public class CougarSerializerFactory extends SerializerFactory {
private Set<TranscribableParams> transcriptionParams;
private Set<String> missingTypes = Collections.newSetFromMap(new ConcurrentHashMap());
public CougarSerializerFactory(Set<TranscribableParams> transcriptionParams) {
this.transcriptionParams = transcriptionParams;
}
public static CougarSerializerFactory createInstance(Set<TranscribableParams> transcriptionParams) {
return new CougarSerializerFactory(transcriptionParams);
}
/**
* Returns a deserializer based on a string type.
*/
public Deserializer getDeserializer(String type)
throws HessianProtocolException
{
if (type == null || type.equals("")) {
return null;
}
if (!transcriptionParams.contains(TranscribableParams.MajorOnlyPackageNaming)) {
// look for vMajor
type = ClassnameCompatibilityMapper.toMajorOnlyPackaging(type);
}
return optimizedGetDeserializer(type);
}
/**
* If a Cougar server response contains a class the client doesn't know about (which is legal and backwards compatible
* in cases) then the default behavior of Hessian is to perform a lookup, fail, throw an exception and log it.
* This has been measured at about 25 times slower than the happy path, and Hessian does not negatively cache 'misses',
* so this is a per-response slowdown. This implementation caches type lookup misses, and so eradicates the problem.
*/
private Deserializer optimizedGetDeserializer(String type)
throws HessianProtocolException {
if (missingTypes.contains(type)) {
return null;
}
Deserializer answer = super.getDeserializer(type);
if (answer == null) {
missingTypes.add(type);
}
return answer;
}
/** Visible for testing */
Set<String> getMissingTypes() {
return missingTypes;
}
}