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From GitBox <...@apache.org>
Subject [GitHub] [celix] pnoltes commented on a change in pull request #185: Add custom serialization service for custom delete functions in RSA
Date Tue, 07 Apr 2020 15:05:08 GMT
pnoltes commented on a change in pull request #185: Add custom serialization service for custom
delete functions in RSA
URL: https://github.com/apache/celix/pull/185#discussion_r404871825

 File path: bundles/remote_services/remote_services_api/include/remote_custom_serialization_service.h
 @@ -0,0 +1,36 @@
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+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
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+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
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+ * Unless required by applicable law or agreed to in writing,
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 Review comment:
   Yeah, I starting to think that we should move away from descriptors and work our way to
custom serialization services. Especially because I see more and more combination of C and
C++ and then custom serialization would create more freedom how to handle this.
   Custom serialization services should not target an individual service (by id), but a message
or service by fully qualified name and an optional version.
   I think we need to split the serialization for services and message. For service we need
a (de)serialisation for the arguments and the return, for message only one set of de/serialization
is needed. 
   //registered with properties targeted.service.fqn, targeted.service.version (optional)

   //mutiple registration are possible -> order by service ranking
   typedef struct rsa_custom_serialization_service {
        void* handle;
       const char* serviceFqn;
       const char* serviceVersion;
        int (*serializeArguments)(void *handle, void *args[] /*NULL terminated*/, char **out);
        int (*deserializeArguments)(void *handle, char *data, void **args[] /*output, NULL
        int (*freeArguments)((void* handle, void *args[] /*NULL terminated*/);
        int (*serializeReturn)(void *handle, void *returnType, char **out);
        int (*deserializeReturn)(void *handle, char *data, void **out);
        int (*freeReturn)(void* handle, void *obj);
    } rsa_custom_serialization_service_t;
   //registered with properties targeted.msg.fqn, targeted.msg.version (optional) and targeted.msg.id
   //mutiple registration are possible -> order by service ranking
   typedef struct pubsub_custom_msg_serializer {
       void* handle;
       unsigned int msgId;
       const char* msgFqn;
       const char* msgVersion;
       celix_status_t (*serialize)(void* handle, const void* input, void** out, size_t* outLen);
       celix_status_t (*deserialize)(void* handle, const void* input, size_t inputLen, void**
out); //note inputLen can be 0 if predefined size is not needed
       void (*freeMsg)(void* handle, void* msg);
   } pubsub_custom_msg_serializer_t; //note almost the same as the current pubsub_msg_serializer_t
   Descriptors can still be supported, but then as an extender pattern. So a json (descriptor)
serializer would monitor the bundles and register a service for every descriptor found. If
there is already a serializer for that descriptor, skip it. 
   PubSub admin will need to ensure that the custom serialization services are map by msg
id instead of names.

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