Avoid fetching the resource/extension on server if we know that the resource/extension does not exist

[antoinebhs]

Describe the current behavior

In the simple test below with a network containing one generator "GEN" without extension, we could avoid fetching on server when the extension or equipment does not exist. We should "cache" the fact that the equipment/extension does not exist in the network. If it does not exist, we should not fetch from the server.

    @Test
    public void testExtensionGetIdentifiable() {
        try (NetworkStoreService service = createNetworkStoreService(randomServerPort)) {
            Network network = EurostagTutorialExample1Factory.create(service.getNetworkFactory());
            service.flush(network);
        }

        try (NetworkStoreService service = createNetworkStoreService(null, randomServerPort)) {
            Network network = service.getNetwork(service.getNetworkIds().keySet().iterator().next());
            Generator gen = network.getGenerator("GEN"); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/generators/GEN
            network.getGenerator("GEN"); // does not fetch as already cached above
            network.getGenerator("GEN123"); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/generators/GEN123 
            network.getGenerator("GEN123"); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/generators/GEN123 
            network.getGenerator("GEN123"); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/generators/GEN123 
            network.getGenerator("GEN123"); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/generators/GEN123 
            gen.getExtension(ActivePowerControl.class); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/identifiables/GEN/extensions/activePowerControl
            gen.getExtension(ActivePowerControl.class); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/identifiables/GEN/extensions/activePowerControl
            gen.getExtension(ActivePowerControl.class); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/identifiables/GEN/extensions/activePowerControl
            gen.getExtension(ActivePowerControl.class); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/identifiables/GEN/extensions/activePowerControl
        }
    }

Describe the expected behavior

    @Test
    public void testExtensionGetIdentifiable() {
        try (NetworkStoreService service = createNetworkStoreService(randomServerPort)) {
            Network network = EurostagTutorialExample1Factory.create(service.getNetworkFactory());
            service.flush(network);
        }

        try (NetworkStoreService service = createNetworkStoreService(null, randomServerPort)) {
            Network network = service.getNetwork(service.getNetworkIds().keySet().iterator().next());
            Generator gen = network.getGenerator("GEN"); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/generators/GEN
            network.getGenerator("GEN"); // does not fetch as already cached above
            network.getGenerator("GEN123"); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/generators/GEN123 
            network.getGenerator("GEN123"); // does not fetch as we know it does not exist 
            network.getGenerator("GEN123"); // does not fetch as we know it does not exist
            network.getGenerator("GEN123"); // does not fetch as we know it does not exist
            gen.getExtension(ActivePowerControl.class); // fetch /networks/fbaeae14-65e9-4a85-91eb-bb96b186a9ab/0/identifiables/GEN/extensions/activePowerControl
            gen.getExtension(ActivePowerControl.class); // does not fetch as we know it does not exist
            gen.getExtension(ActivePowerControl.class); // does not fetch as we know it does not exist
            gen.getExtension(ActivePowerControl.class); // does not fetch as we know it does not exist
        }
    }

Describe the motivation

No response

Extra Information

No response