1 /* 2 * Copyright (C) 2016 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.grpc.server.processor; 18 19 import static com.squareup.javapoet.MethodSpec.methodBuilder; 20 import static com.squareup.javapoet.TypeSpec.classBuilder; 21 import static com.squareup.javapoet.WildcardTypeName.subtypeOf; 22 import static javax.lang.model.element.Modifier.FINAL; 23 import static javax.lang.model.element.Modifier.PUBLIC; 24 import static javax.lang.model.element.Modifier.STATIC; 25 26 import com.squareup.javapoet.ClassName; 27 import com.squareup.javapoet.MethodSpec; 28 import com.squareup.javapoet.ParameterSpec; 29 import com.squareup.javapoet.ParameterizedTypeName; 30 import com.squareup.javapoet.TypeName; 31 import com.squareup.javapoet.TypeSpec; 32 import dagger.grpc.server.GrpcService; 33 import java.util.List; 34 35 /** 36 * An object that generates the non-proxying service definition module for a {@link 37 * GrpcService}-annotated service implementation. 38 */ 39 final class GrpcServiceModuleGenerator extends SourceGenerator { 40 41 private static final TypeName LIST_OF_INTERCEPTORS = ParameterizedTypeName.get( 42 ClassName.get(List.class), subtypeOf(IoGrpc.SERVER_INTERCEPTOR)); 43 44 private final GrpcServiceModel grpcServiceModel; 45 GrpcServiceModuleGenerator(GrpcServiceModel grpcServiceModel)46 GrpcServiceModuleGenerator(GrpcServiceModel grpcServiceModel) { 47 super(grpcServiceModel.packageName()); 48 this.grpcServiceModel = grpcServiceModel; 49 } 50 51 @Override createType()52 protected TypeSpec createType() { 53 TypeSpec.Builder serviceModule = 54 classBuilder(grpcServiceModel.serviceModuleName) 55 .addJavadoc( 56 "Install this module in the {@link $T @Singleton} server component\n", 57 JavaxInject.singleton().type) 58 .addJavadoc( 59 "or in the subcomponent that implements {@link $T}.\n", 60 grpcServiceModel.serviceDefinitionTypeName); 61 grpcServiceModel.generatedAnnotation().ifPresent(serviceModule::addAnnotation); 62 return serviceModule 63 .addAnnotation(Dagger.module()) 64 .addModifiers(PUBLIC, FINAL) 65 .addMethod(provideServiceDefinition()) 66 .build(); 67 } 68 69 /** 70 * Returns the {@link dagger.Provides @Provides} method for the {@link 71 * io.grpc.ServerServiceDefinition} for the service. 72 */ provideServiceDefinition()73 private MethodSpec provideServiceDefinition() { 74 return methodBuilder("serviceDefinition") 75 .addAnnotation(Dagger.provides()) 76 .addAnnotation(grpcServiceModel.forGrpcService()) 77 .addModifiers(STATIC) 78 .returns(IoGrpc.SERVER_SERVICE_DEFINITION) 79 .addParameter(grpcServiceModel.serviceImplementationClassName, "implementation") 80 .addParameter( 81 ParameterSpec.builder(LIST_OF_INTERCEPTORS, "interceptors") 82 .addAnnotation(grpcServiceModel.forGrpcService()) 83 .build()) 84 .addStatement( 85 "$T serviceDefinition = implementation.bindService()", IoGrpc.SERVER_SERVICE_DEFINITION) 86 .addStatement( 87 "return $T.intercept(serviceDefinition, interceptors)", IoGrpc.SERVER_INTERCEPTORS) 88 .build(); 89 } 90 } 91