kalix.javasdk.view.ReflectiveViewProvider Maven / Gradle / Ivy
/*
* Copyright 2021 Lightbend Inc.
*
* 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 kalix.javasdk.view;
import com.google.protobuf.Descriptors;
import kalix.javasdk.annotations.ViewId;
import kalix.javasdk.impl.MessageCodec;
import kalix.javasdk.impl.view.ViewRouter;
import kalix.javasdk.impl.ComponentDescriptor;
import kalix.javasdk.impl.ComponentDescriptorFactory;
import kalix.javasdk.impl.JsonMessageCodec;
import kalix.javasdk.impl.view.ReflectiveViewRouter;
import java.util.Optional;
import java.util.function.Function;
public class ReflectiveViewProvider> implements ViewProvider {
private final Function factory;
private final String viewId;
private final ViewOptions options;
private final Descriptors.FileDescriptor fileDescriptor;
private final Descriptors.ServiceDescriptor serviceDescriptor;
private final ComponentDescriptor componentDescriptor;
private final JsonMessageCodec messageCodec;
public static > ReflectiveViewProvider of(
Class cls, JsonMessageCodec messageCodec, Function factory) {
String viewId =
Optional.ofNullable(cls.getAnnotation(ViewId.class))
.map(ViewId::value)
.orElseGet(cls::getName);
return new ReflectiveViewProvider<>(cls, messageCodec, viewId, factory, ViewOptions.defaults());
}
private ReflectiveViewProvider(
Class cls,
JsonMessageCodec messageCodec,
String viewId,
Function factory,
ViewOptions options) {
this.factory = factory;
this.options = options;
this.messageCodec = messageCodec;
this.viewId = viewId;
this.componentDescriptor = ComponentDescriptor.descriptorFor(cls, messageCodec);
this.fileDescriptor = componentDescriptor.fileDescriptor();
this.serviceDescriptor = componentDescriptor.serviceDescriptor();
}
@Override
public Descriptors.ServiceDescriptor serviceDescriptor() {
return serviceDescriptor;
}
@Override
public String viewId() {
return viewId;
}
@Override
public ViewOptions options() {
return options;
}
@Override
public ViewRouter newRouter(ViewCreationContext context) {
V view = factory.apply(context);
return new ReflectiveViewRouter<>(view, componentDescriptor.commandHandlers(), ComponentDescriptorFactory.findIgnore(view.getClass()));
}
@Override
public Descriptors.FileDescriptor[] additionalDescriptors() {
return new Descriptors.FileDescriptor[0];
}
@Override
public Optional alternativeCodec() {
return Optional.of(messageCodec);
}
}