Renamed class
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/*
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* Copyright 2020 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.network.serialization
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import dorkbox.network.rmi.messages.RmiClientReverseSerializer
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/**
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* This is to manage serializing RMI objects across the wire...
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*
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* NOTE:
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* CLIENT: can never send the iface object, if it's RMI, it will send the java Proxy object instead.
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* SERVER: can never send the iface object, it will always send the IMPL object instead (because of how kryo works)
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*
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* **************************
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* NOTE: This works because we TRICK kryo serialization by changing what the kryo ID serializer is on each end of the connection
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* **************************
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*
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* What we do is on the server, REWRITE the kryo ID for the impl so that it will send just the rmi ID instead of the object
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* on the client, this SAME kryo ID must have this serializer as well, so the proxy object is re-assembled.
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*
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* Kryo serialization works by inspecting the field VALUE type, not the field DEFINED type... So if you send an actual object, you must
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* register specifically for the implementation object.
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*
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*
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* To recap:
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* rmi-client: send proxy -> RmiIfaceSerializer -> network -> RmiIfaceSerializer -> impl object (rmi-server)
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* rmi-server: send impl -> RmiImplSerializer -> network -> RmiImplSerializer -> proxy object (rmi-client)
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*
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* During the handshake, if the impl object 'lives' on the CLIENT, then the client must tell the server that the iface ID must use this serializer.
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* If the impl object 'lives' on the SERVER, then the server must tell the client about the iface ID
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*/
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internal class ClassRegistrationIfaceAndImpl(ifaceClass: Class<*>,
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val implClass: Class<*>,
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serializer: RmiClientReverseSerializer) : ClassRegistration(ifaceClass, serializer) {
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override fun register(kryo: KryoExtra) {
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// have to get the ID for the interface (if it exists)
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val registration = kryo.classResolver.getRegistration(clazz) // this is ifaceClass, and must match what is defined on the rmi client
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if (registration != null) {
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id = registration.id
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// override that registration
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kryo.register(implClass, serializer, id)
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} else {
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// now register the impl class
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id = kryo.register(implClass, serializer).id
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}
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info = "Registered $id -> (RMI) ${implClass.name}"
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}
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override fun getInfoArray(): Array<Any> {
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// the info array has to match for the INTERFACE (not the impl!)
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return arrayOf(id, clazz.name, serializer!!::class.java.name)
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}
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}
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