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AbstractServiceClientClassComposer.java
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AbstractServiceClientClassComposer.java
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// Copyright 2020 Google LLC
//
// 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 com.google.api.generator.gapic.composer.common;
import com.google.api.core.ApiFunction;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;
import com.google.api.core.BetaApi;
import com.google.api.gax.core.BackgroundResource;
import com.google.api.gax.longrunning.OperationFuture;
import com.google.api.gax.paging.AbstractFixedSizeCollection;
import com.google.api.gax.paging.AbstractPage;
import com.google.api.gax.paging.AbstractPagedListResponse;
import com.google.api.gax.rpc.BidiStreamingCallable;
import com.google.api.gax.rpc.ClientStreamingCallable;
import com.google.api.gax.rpc.OperationCallable;
import com.google.api.gax.rpc.PageContext;
import com.google.api.gax.rpc.ServerStreamingCallable;
import com.google.api.gax.rpc.UnaryCallable;
import com.google.api.generator.engine.ast.AnnotationNode;
import com.google.api.generator.engine.ast.AssignmentExpr;
import com.google.api.generator.engine.ast.CastExpr;
import com.google.api.generator.engine.ast.ClassDefinition;
import com.google.api.generator.engine.ast.CommentStatement;
import com.google.api.generator.engine.ast.ConcreteReference;
import com.google.api.generator.engine.ast.Expr;
import com.google.api.generator.engine.ast.ExprStatement;
import com.google.api.generator.engine.ast.LambdaExpr;
import com.google.api.generator.engine.ast.MethodDefinition;
import com.google.api.generator.engine.ast.MethodInvocationExpr;
import com.google.api.generator.engine.ast.NewObjectExpr;
import com.google.api.generator.engine.ast.PrimitiveValue;
import com.google.api.generator.engine.ast.Reference;
import com.google.api.generator.engine.ast.ReferenceConstructorExpr;
import com.google.api.generator.engine.ast.RelationalOperationExpr;
import com.google.api.generator.engine.ast.ScopeNode;
import com.google.api.generator.engine.ast.Statement;
import com.google.api.generator.engine.ast.SuperObjectValue;
import com.google.api.generator.engine.ast.TernaryExpr;
import com.google.api.generator.engine.ast.ThisObjectValue;
import com.google.api.generator.engine.ast.TypeNode;
import com.google.api.generator.engine.ast.ValueExpr;
import com.google.api.generator.engine.ast.Variable;
import com.google.api.generator.engine.ast.VariableExpr;
import com.google.api.generator.gapic.composer.comment.ServiceClientCommentComposer;
import com.google.api.generator.gapic.composer.samplecode.ServiceClientSampleCodeComposer;
import com.google.api.generator.gapic.composer.store.TypeStore;
import com.google.api.generator.gapic.composer.utils.ClassNames;
import com.google.api.generator.gapic.composer.utils.PackageChecker;
import com.google.api.generator.gapic.model.Field;
import com.google.api.generator.gapic.model.GapicClass;
import com.google.api.generator.gapic.model.GapicClass.Kind;
import com.google.api.generator.gapic.model.GapicContext;
import com.google.api.generator.gapic.model.LongrunningOperation;
import com.google.api.generator.gapic.model.Message;
import com.google.api.generator.gapic.model.Method;
import com.google.api.generator.gapic.model.Method.Stream;
import com.google.api.generator.gapic.model.MethodArgument;
import com.google.api.generator.gapic.model.ResourceName;
import com.google.api.generator.gapic.model.Service;
import com.google.api.generator.gapic.utils.JavaStyle;
import com.google.api.generator.util.TriFunction;
import com.google.api.generator.util.Trie;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.util.concurrent.MoreExecutors;
import com.google.gapic.metadata.GapicMetadata;
import com.google.longrunning.Operation;
import com.google.rpc.Status;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.stream.Collectors;
import javax.annotation.Generated;
public abstract class AbstractServiceClientClassComposer implements ClassComposer {
private static final String PAGED_RESPONSE_TYPE_NAME_PATTERN = "%sPagedResponse";
private static final String CALLABLE_NAME_PATTERN = "%sCallable";
private static final String PAGED_CALLABLE_NAME_PATTERN = "%sPagedCallable";
private static final String OPERATION_CALLABLE_NAME_PATTERN = "%sOperationCallable";
private static final Reference LIST_REFERENCE = ConcreteReference.withClazz(List.class);
private static final Reference MAP_REFERENCE = ConcreteReference.withClazz(Map.class);
private static final TypeNode OBJECTS_TYPE =
TypeNode.withReference(ConcreteReference.withClazz(Objects.class));
private enum CallableMethodKind {
REGULAR,
LRO,
PAGED,
}
private final TransportContext transportContext;
protected AbstractServiceClientClassComposer(TransportContext transportContext) {
this.transportContext = transportContext;
}
protected TransportContext getTransportContext() {
return transportContext;
}
@Override
public GapicClass generate(GapicContext context, Service service) {
Map<String, ResourceName> resourceNames = context.helperResourceNames();
Map<String, Message> messageTypes = context.messages();
TypeStore typeStore = createTypes(service, messageTypes);
String className = ClassNames.getServiceClientClassName(service);
GapicClass.Kind kind = Kind.MAIN;
String pakkage = service.pakkage();
boolean hasLroClient = hasLroMethods(service);
Map<String, List<String>> grpcRpcsToJavaMethodNames = new HashMap<>();
ClassDefinition classDef =
ClassDefinition.builder()
.setHeaderCommentStatements(
createClassHeaderComments(service, typeStore, resourceNames, messageTypes))
.setPackageString(pakkage)
.setAnnotations(createClassAnnotations(service, typeStore))
.setScope(ScopeNode.PUBLIC)
.setName(className)
.setImplementsTypes(createClassImplements(typeStore))
.setStatements(createFieldDeclarations(service, typeStore, hasLroClient))
.setMethods(
createClassMethods(
service,
messageTypes,
typeStore,
resourceNames,
hasLroClient,
grpcRpcsToJavaMethodNames))
.setNestedClasses(createNestedPagingClasses(service, messageTypes, typeStore))
.build();
updateGapicMetadata(context, service, className, grpcRpcsToJavaMethodNames);
return GapicClass.create(kind, classDef);
}
private static List<AnnotationNode> createClassAnnotations(Service service, TypeStore typeStore) {
List<AnnotationNode> annotations = new ArrayList<>();
if (!PackageChecker.isGaApi(service.pakkage())) {
annotations.add(AnnotationNode.withType(typeStore.get("BetaApi")));
}
if (service.isDeprecated()) {
annotations.add(AnnotationNode.withType(TypeNode.DEPRECATED));
}
annotations.add(
AnnotationNode.builder()
.setType(typeStore.get("Generated"))
.setDescription("by gapic-generator-java")
.build());
return annotations;
}
private static List<TypeNode> createClassImplements(TypeStore typeStore) {
return Arrays.asList(typeStore.get("BackgroundResource"));
}
private static List<CommentStatement> createClassHeaderComments(
Service service,
TypeStore typeStore,
Map<String, ResourceName> resourceNames,
Map<String, Message> messageTypes) {
TypeNode clientType = typeStore.get(ClassNames.getServiceClientClassName(service));
TypeNode settingsType = typeStore.get(ClassNames.getServiceSettingsClassName(service));
String classMethodSampleCode =
ServiceClientSampleCodeComposer.composeClassHeaderMethodSampleCode(
service, clientType, resourceNames, messageTypes);
String credentialsSampleCode =
ServiceClientSampleCodeComposer.composeClassHeaderCredentialsSampleCode(
clientType, settingsType);
String endpointSampleCode =
ServiceClientSampleCodeComposer.composeClassHeaderEndpointSampleCode(
clientType, settingsType);
return ServiceClientCommentComposer.createClassHeaderComments(
service, classMethodSampleCode, credentialsSampleCode, endpointSampleCode);
}
private List<MethodDefinition> createClassMethods(
Service service,
Map<String, Message> messageTypes,
TypeStore typeStore,
Map<String, ResourceName> resourceNames,
boolean hasLroClient,
Map<String, List<String>> grpcRpcToJavaMethodMetadata) {
List<MethodDefinition> methods = new ArrayList<>();
methods.addAll(createStaticCreatorMethods(service, typeStore));
methods.addAll(createConstructorMethods(service, typeStore, hasLroClient));
methods.addAll(createGetterMethods(service, typeStore, hasLroClient));
methods.addAll(
createServiceMethods(
service, messageTypes, typeStore, resourceNames, grpcRpcToJavaMethodMetadata));
methods.addAll(createBackgroundResourceMethods(service, typeStore));
return methods;
}
private static boolean hasLroMethods(Service service) {
for (Method method : service.methods()) {
if (method.hasLro()) {
return true;
}
}
return false;
}
private List<Statement> createFieldDeclarations(
Service service, TypeStore typeStore, boolean hasLroClient) {
Map<String, TypeNode> fieldNameToTypes = new HashMap<>();
fieldNameToTypes.put(
"settings", typeStore.get(ClassNames.getServiceSettingsClassName(service)));
fieldNameToTypes.put("stub", typeStore.get(ClassNames.getServiceStubClassName(service)));
if (hasLroClient) {
fieldNameToTypes.put(
getTransportContext().operationsClientName(),
getTransportContext().operationsClientType());
}
return fieldNameToTypes.entrySet().stream()
.map(
e -> {
String varName = e.getKey();
TypeNode varType = e.getValue();
Variable variable = Variable.builder().setName(varName).setType(varType).build();
VariableExpr varExpr =
VariableExpr.builder()
.setVariable(variable)
.setScope(ScopeNode.PRIVATE)
.setIsFinal(true)
.setIsDecl(true)
.build();
return ExprStatement.withExpr(varExpr);
})
.collect(Collectors.toList());
}
private static List<MethodDefinition> createStaticCreatorMethods(
Service service, TypeStore typeStore) {
List<MethodDefinition> methods = new ArrayList<>();
String thisClientName = ClassNames.getServiceClientClassName(service);
String settingsName = ClassNames.getServiceSettingsClassName(service);
TypeNode thisClassType = typeStore.get(thisClientName);
TypeNode exceptionType = typeStore.get("IOException");
TypeNode settingsType = typeStore.get(settingsName);
Preconditions.checkNotNull(settingsType, String.format("Type %s not found", settingsName));
MethodInvocationExpr newBuilderExpr =
MethodInvocationExpr.builder()
.setMethodName("newBuilder")
.setStaticReferenceType(settingsType)
.build();
MethodInvocationExpr buildExpr =
MethodInvocationExpr.builder()
.setMethodName("build")
.setExprReferenceExpr(newBuilderExpr)
.build();
MethodInvocationExpr createMethodInvocationExpr =
MethodInvocationExpr.builder()
.setMethodName("create")
.setArguments(Arrays.asList(buildExpr))
.setReturnType(typeStore.get(thisClientName))
.build();
MethodDefinition createMethodOne =
MethodDefinition.builder()
.setHeaderCommentStatements(
ServiceClientCommentComposer.createMethodNoArgComment(
ClassNames.getServiceClientClassName(service)))
.setScope(ScopeNode.PUBLIC)
.setIsStatic(true)
.setIsFinal(true)
.setReturnType(thisClassType)
.setName("create")
.setThrowsExceptions(Arrays.asList(exceptionType))
.setReturnExpr(createMethodInvocationExpr)
.build();
methods.add(createMethodOne);
// Second create(ServiceSettings settings) method.
VariableExpr settingsVarExpr =
VariableExpr.withVariable(
Variable.builder().setName("settings").setType(typeStore.get(settingsName)).build());
methods.add(
MethodDefinition.builder()
.setHeaderCommentStatements(
ServiceClientCommentComposer.createMethodSettingsArgComment(
ClassNames.getServiceClientClassName(service)))
.setScope(ScopeNode.PUBLIC)
.setIsStatic(true)
.setIsFinal(true)
.setReturnType(thisClassType)
.setName("create")
.setThrowsExceptions(Arrays.asList(exceptionType))
.setArguments(settingsVarExpr.toBuilder().setIsDecl(true).build())
.setReturnExpr(
NewObjectExpr.builder()
.setType(thisClassType)
.setArguments(settingsVarExpr)
.build())
.build());
// Third create(ServiceStub stub) method.
VariableExpr stubVarExpr =
VariableExpr.withVariable(
Variable.builder()
.setType(typeStore.get(ClassNames.getServiceStubClassName(service)))
.setName("stub")
.build());
AnnotationNode betaAnnotation =
AnnotationNode.builder()
.setType(typeStore.get("BetaApi"))
.setDescription(
"A restructuring of stub classes is planned, so this may break in the future")
.build();
methods.add(
MethodDefinition.builder()
.setHeaderCommentStatements(
ServiceClientCommentComposer.createCreateMethodStubArgComment(
ClassNames.getServiceClientClassName(service), settingsVarExpr.type()))
.setAnnotations(Arrays.asList(betaAnnotation))
.setScope(ScopeNode.PUBLIC)
.setIsStatic(true)
.setIsFinal(true)
.setReturnType(thisClassType)
.setName("create")
.setArguments(stubVarExpr.toBuilder().setIsDecl(true).build())
.setReturnExpr(
NewObjectExpr.builder().setType(thisClassType).setArguments(stubVarExpr).build())
.build());
return methods;
}
private List<MethodDefinition> createConstructorMethods(
Service service, TypeStore typeStore, boolean hasLroClient) {
List<MethodDefinition> methods = new ArrayList<>();
String thisClientName = ClassNames.getServiceClientClassName(service);
String settingsName = ClassNames.getServiceSettingsClassName(service);
TypeNode thisClassType = typeStore.get(thisClientName);
TypeNode stubSettingsType = typeStore.get(ClassNames.getServiceStubSettingsClassName(service));
TypeNode operationsClientType = getTransportContext().operationsClientType();
TypeNode exceptionType = typeStore.get("IOException");
TypeNode settingsType = typeStore.get(settingsName);
VariableExpr settingsVarExpr =
VariableExpr.withVariable(
Variable.builder().setName("settings").setType(typeStore.get(settingsName)).build());
VariableExpr stubVarExpr =
VariableExpr.withVariable(
Variable.builder()
.setType(typeStore.get(ClassNames.getServiceStubClassName(service)))
.setName("stub")
.build());
VariableExpr operationsClientVarExpr =
VariableExpr.withVariable(
Variable.builder()
.setType(operationsClientType)
.setName(getTransportContext().operationsClientName())
.build());
// Create the ServiceClient(ServiceSettings settings) ctor.
List<Expr> ctorAssignmentExprs = new ArrayList<>();
Expr thisExpr = ValueExpr.withValue(ThisObjectValue.withType(thisClassType));
ctorAssignmentExprs.add(
AssignmentExpr.builder()
.setVariableExpr(settingsVarExpr.toBuilder().setExprReferenceExpr(thisExpr).build())
.setValueExpr(settingsVarExpr)
.build());
ctorAssignmentExprs.add(
AssignmentExpr.builder()
.setVariableExpr(stubVarExpr.toBuilder().setExprReferenceExpr(thisExpr).build())
.setValueExpr(
MethodInvocationExpr.builder()
.setExprReferenceExpr(
CastExpr.builder()
.setType(stubSettingsType)
.setExpr(
MethodInvocationExpr.builder()
.setExprReferenceExpr(settingsVarExpr)
.setMethodName("getStubSettings")
.setReturnType(stubSettingsType)
.build())
.build())
.setMethodName("createStub")
.setReturnType(stubVarExpr.type())
.build())
.build());
String operationsStubGetterName =
String.format(
"get%s",
JavaStyle.toUpperCamelCase(getTransportContext().transportOperationsStubName()));
Expr clientArgExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(stubVarExpr.toBuilder().setExprReferenceExpr(thisExpr).build())
.setMethodName(operationsStubGetterName)
.build();
AssignmentExpr operationsClientAssignExpr =
AssignmentExpr.builder()
.setVariableExpr(
operationsClientVarExpr.toBuilder().setExprReferenceExpr(thisExpr).build())
.setValueExpr(
MethodInvocationExpr.builder()
.setStaticReferenceType(operationsClientType)
.setMethodName("create")
.setArguments(clientArgExpr)
.setReturnType(operationsClientVarExpr.type())
.build())
.build();
if (hasLroClient) {
ctorAssignmentExprs.add(operationsClientAssignExpr);
}
methods.add(
MethodDefinition.constructorBuilder()
.setHeaderCommentStatements(
ServiceClientCommentComposer.createProtectedCtorSettingsArgComment(
ClassNames.getServiceClientClassName(service)))
.setScope(ScopeNode.PROTECTED)
.setReturnType(thisClassType)
.setArguments(settingsVarExpr.toBuilder().setIsDecl(true).build())
.setThrowsExceptions(Arrays.asList(exceptionType))
.setBody(
ctorAssignmentExprs.stream()
.map(e -> ExprStatement.withExpr(e))
.collect(Collectors.toList()))
.build());
// Create the ServiceClient(ServiceStub stub) ctor.
ctorAssignmentExprs.clear();
ctorAssignmentExprs.add(
AssignmentExpr.builder()
.setVariableExpr(settingsVarExpr.toBuilder().setExprReferenceExpr(thisExpr).build())
.setValueExpr(ValueExpr.createNullExpr())
.build());
ctorAssignmentExprs.add(
AssignmentExpr.builder()
.setVariableExpr(stubVarExpr.toBuilder().setExprReferenceExpr(thisExpr).build())
.setValueExpr(stubVarExpr)
.build());
if (hasLroClient) {
ctorAssignmentExprs.add(operationsClientAssignExpr);
}
AnnotationNode betaAnnotation =
AnnotationNode.builder()
.setType(typeStore.get("BetaApi"))
.setDescription(
"A restructuring of stub classes is planned, so this may break in the future")
.build();
methods.add(
MethodDefinition.constructorBuilder()
.setAnnotations(Arrays.asList(betaAnnotation))
.setScope(ScopeNode.PROTECTED)
.setReturnType(thisClassType)
.setArguments(stubVarExpr.toBuilder().setIsDecl(true).build())
.setBody(
ctorAssignmentExprs.stream()
.map(e -> ExprStatement.withExpr(e))
.collect(Collectors.toList()))
.build());
return methods;
}
private List<MethodDefinition> createGetterMethods(
Service service, TypeStore typeStore, boolean hasLroClient) {
Map<String, TypeNode> methodNameToTypes = new LinkedHashMap<>();
methodNameToTypes.put(
"getSettings", typeStore.get(ClassNames.getServiceSettingsClassName(service)));
methodNameToTypes.put("getStub", typeStore.get(ClassNames.getServiceStubClassName(service)));
String getOperationsClientMethodName =
String.format(
"get%s",
JavaStyle.toUpperCamelCase(getTransportContext().operationsClientName()));
if (hasLroClient) {
methodNameToTypes.put(
getOperationsClientMethodName, getTransportContext().operationsClientType());
}
AnnotationNode betaStubAnnotation =
AnnotationNode.builder()
.setType(typeStore.get("BetaApi"))
.setDescription(
"A restructuring of stub classes is planned, so this may break in the future")
.build();
return methodNameToTypes.entrySet().stream()
.map(
e -> {
String methodName = e.getKey();
TypeNode methodReturnType = e.getValue();
String returnVariableName = JavaStyle.toLowerCamelCase(methodName.substring(3));
MethodDefinition.Builder methodBuilder = MethodDefinition.builder();
if (methodName.equals(getOperationsClientMethodName)) {
methodBuilder =
methodBuilder.setHeaderCommentStatements(
ServiceClientCommentComposer.GET_OPERATIONS_CLIENT_METHOD_COMMENT);
}
return methodBuilder
.setAnnotations(
methodName.equals("getStub")
? Arrays.asList(betaStubAnnotation)
: Collections.emptyList())
.setScope(ScopeNode.PUBLIC)
.setName(methodName)
.setIsFinal(!methodName.equals("getStub"))
.setReturnType(methodReturnType)
.setReturnExpr(
VariableExpr.builder()
.setVariable(
Variable.builder()
.setName(returnVariableName)
.setType(methodReturnType)
.build())
.build())
.build();
})
.collect(Collectors.toList());
}
private static List<MethodDefinition> createServiceMethods(
Service service,
Map<String, Message> messageTypes,
TypeStore typeStore,
Map<String, ResourceName> resourceNames,
Map<String, List<String>> grpcRpcToJavaMethodMetadata) {
List<MethodDefinition> javaMethods = new ArrayList<>();
Function<MethodDefinition, String> javaMethodNameFn = m -> m.methodIdentifier().name();
for (Method method : service.methods()) {
if (!grpcRpcToJavaMethodMetadata.containsKey(method.name())) {
grpcRpcToJavaMethodMetadata.put(method.name(), new ArrayList<>());
}
if (method.stream().equals(Stream.NONE)) {
List<MethodDefinition> generatedMethods =
createMethodVariants(
method,
ClassNames.getServiceClientClassName(service),
messageTypes,
typeStore,
resourceNames);
// Collect data for gapic_metadata.json.
grpcRpcToJavaMethodMetadata
.get(method.name())
.addAll(
generatedMethods.stream()
.map(m -> javaMethodNameFn.apply(m))
.collect(Collectors.toList()));
javaMethods.addAll(generatedMethods);
MethodDefinition generatedMethod =
createMethodDefaultMethod(
method,
ClassNames.getServiceClientClassName(service),
messageTypes,
typeStore,
resourceNames);
// Collect data for gapic_metadata.json.
grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod));
javaMethods.add(generatedMethod);
}
if (method.hasLro()) {
MethodDefinition generatedMethod =
createLroCallableMethod(service, method, typeStore, messageTypes, resourceNames);
// Collect data for gapic_metadata.json.
grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod));
javaMethods.add(generatedMethod);
}
if (method.isPaged()) {
MethodDefinition generatedMethod =
createPagedCallableMethod(service, method, typeStore, messageTypes, resourceNames);
// Collect data for gapic_metadata.json.
grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod));
javaMethods.add(generatedMethod);
}
MethodDefinition generatedMethod =
createCallableMethod(service, method, typeStore, messageTypes, resourceNames);
// Collect data for the gapic_metadata.json file.
grpcRpcToJavaMethodMetadata.get(method.name()).add(javaMethodNameFn.apply(generatedMethod));
javaMethods.add(generatedMethod);
}
return javaMethods;
}
private static List<MethodDefinition> createMethodVariants(
Method method,
String clientName,
Map<String, Message> messageTypes,
TypeStore typeStore,
Map<String, ResourceName> resourceNames) {
List<MethodDefinition> javaMethods = new ArrayList<>();
String methodName = JavaStyle.toLowerCamelCase(method.name());
TypeNode methodInputType = method.inputType();
TypeNode methodOutputType =
method.isPaged()
? typeStore.get(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, method.name()))
: method.outputType();
if (method.hasLro()) {
LongrunningOperation lro = method.lro();
methodOutputType =
TypeNode.withReference(
typeStore
.get("OperationFuture")
.reference()
.copyAndSetGenerics(
Arrays.asList(
lro.responseType().reference(), lro.metadataType().reference())));
}
String methodInputTypeName = methodInputType.reference().name();
for (List<MethodArgument> signature : method.methodSignatures()) {
// Get the argument list.
List<VariableExpr> arguments =
signature.stream()
.map(
methodArg ->
VariableExpr.builder()
.setVariable(
Variable.builder()
.setName(JavaStyle.toLowerCamelCase(methodArg.name()))
.setType(methodArg.type())
.build())
.setIsDecl(true)
.build())
.collect(Collectors.toList());
// Request proto builder.
VariableExpr requestVarExpr =
VariableExpr.builder()
.setVariable(Variable.builder().setName("request").setType(methodInputType).build())
.setIsDecl(true)
.build();
Expr requestBuilderExpr = createRequestBuilderExpr(method, signature, typeStore);
AssignmentExpr requestAssignmentExpr =
AssignmentExpr.builder()
.setVariableExpr(requestVarExpr)
.setValueExpr(requestBuilderExpr)
.build();
List<Statement> statements = new ArrayList<>();
statements.add(ExprStatement.withExpr(requestAssignmentExpr));
MethodInvocationExpr rpcInvocationExpr =
MethodInvocationExpr.builder()
.setMethodName(String.format(method.hasLro() ? "%sAsync" : "%s", methodName))
.setArguments(Arrays.asList(requestVarExpr.toBuilder().setIsDecl(false).build()))
.setReturnType(methodOutputType)
.build();
Optional<String> methodSampleCode =
Optional.of(
ServiceClientSampleCodeComposer.composeRpcMethodHeaderSampleCode(
method, typeStore.get(clientName), signature, resourceNames, messageTypes));
MethodDefinition.Builder methodVariantBuilder =
MethodDefinition.builder()
.setHeaderCommentStatements(
ServiceClientCommentComposer.createRpcMethodHeaderComment(
method, signature, methodSampleCode))
.setScope(ScopeNode.PUBLIC)
.setIsFinal(true)
.setName(String.format(method.hasLro() ? "%sAsync" : "%s", methodName))
.setArguments(arguments);
if (isProtoEmptyType(methodOutputType)) {
statements.add(ExprStatement.withExpr(rpcInvocationExpr));
methodVariantBuilder = methodVariantBuilder.setReturnType(TypeNode.VOID);
} else {
methodVariantBuilder =
methodVariantBuilder.setReturnType(methodOutputType).setReturnExpr(rpcInvocationExpr);
}
if (method.isDeprecated()) {
methodVariantBuilder =
methodVariantBuilder.setAnnotations(
Arrays.asList(AnnotationNode.withType(TypeNode.DEPRECATED)));
}
methodVariantBuilder = methodVariantBuilder.setBody(statements);
javaMethods.add(methodVariantBuilder.build());
}
return javaMethods;
}
private static MethodDefinition createMethodDefaultMethod(
Method method,
String clientName,
Map<String, Message> messageTypes,
TypeStore typeStore,
Map<String, ResourceName> resourceNames) {
String methodName = JavaStyle.toLowerCamelCase(method.name());
TypeNode methodInputType = method.inputType();
TypeNode methodOutputType =
method.isPaged()
? typeStore.get(String.format(PAGED_RESPONSE_TYPE_NAME_PATTERN, method.name()))
: method.outputType();
if (method.hasLro()) {
LongrunningOperation lro = method.lro();
methodOutputType =
TypeNode.withReference(
typeStore
.get("OperationFuture")
.reference()
.copyAndSetGenerics(
Arrays.asList(
lro.responseType().reference(), lro.metadataType().reference())));
}
// Construct the method that accepts a request proto.
VariableExpr requestArgVarExpr =
VariableExpr.builder()
.setVariable(Variable.builder().setName("request").setType(methodInputType).build())
.setIsDecl(true)
.build();
String callableMethodName =
method.isPaged()
? String.format(PAGED_CALLABLE_NAME_PATTERN, methodName)
: String.format(CALLABLE_NAME_PATTERN, methodName);
if (method.hasLro()) {
callableMethodName = String.format(OPERATION_CALLABLE_NAME_PATTERN, methodName);
}
Optional<String> defaultMethodSampleCode =
Optional.of(
ServiceClientSampleCodeComposer.composeRpcDefaultMethodHeaderSampleCode(
method, typeStore.get(clientName), resourceNames, messageTypes));
MethodInvocationExpr callableMethodExpr =
MethodInvocationExpr.builder().setMethodName(callableMethodName).build();
callableMethodExpr =
MethodInvocationExpr.builder()
.setMethodName(method.hasLro() ? "futureCall" : "call")
.setArguments(Arrays.asList(requestArgVarExpr.toBuilder().setIsDecl(false).build()))
.setExprReferenceExpr(callableMethodExpr)
.setReturnType(methodOutputType)
.build();
MethodDefinition.Builder methodBuilder =
MethodDefinition.builder()
.setHeaderCommentStatements(
ServiceClientCommentComposer.createRpcMethodHeaderComment(
method, defaultMethodSampleCode))
.setScope(ScopeNode.PUBLIC)
.setIsFinal(true)
.setName(String.format(method.hasLro() ? "%sAsync" : "%s", methodName))
.setArguments(Arrays.asList(requestArgVarExpr));
if (method.isDeprecated()) {
methodBuilder =
methodBuilder.setAnnotations(Arrays.asList(AnnotationNode.withType(TypeNode.DEPRECATED)));
}
if (isProtoEmptyType(methodOutputType)) {
methodBuilder =
methodBuilder
.setBody(Arrays.asList(ExprStatement.withExpr(callableMethodExpr)))
.setReturnType(TypeNode.VOID);
} else {
methodBuilder =
methodBuilder.setReturnExpr(callableMethodExpr).setReturnType(methodOutputType);
}
return methodBuilder.build();
}
private static MethodDefinition createLroCallableMethod(
Service service,
Method method,
TypeStore typeStore,
Map<String, Message> messageTypes,
Map<String, ResourceName> resourceNames) {
return createCallableMethod(
service, method, CallableMethodKind.LRO, typeStore, messageTypes, resourceNames);
}
private static MethodDefinition createCallableMethod(
Service service,
Method method,
TypeStore typeStore,
Map<String, Message> messageTypes,
Map<String, ResourceName> resourceNames) {
return createCallableMethod(
service, method, CallableMethodKind.REGULAR, typeStore, messageTypes, resourceNames);
}
private static MethodDefinition createPagedCallableMethod(
Service service,
Method method,
TypeStore typeStore,
Map<String, Message> messageTypes,
Map<String, ResourceName> resourceNames) {
return createCallableMethod(
service, method, CallableMethodKind.PAGED, typeStore, messageTypes, resourceNames);
}
private static MethodDefinition createCallableMethod(
Service service,
Method method,
CallableMethodKind callableMethodKind,
TypeStore typeStore,
Map<String, Message> messageTypes,
Map<String, ResourceName> resourceNames) {
TypeNode rawCallableReturnType = null;
if (callableMethodKind.equals(CallableMethodKind.LRO)) {
rawCallableReturnType = typeStore.get("OperationCallable");
} else {
switch (method.stream()) {
case CLIENT:
rawCallableReturnType = typeStore.get("ClientStreamingCallable");
break;
case SERVER:
rawCallableReturnType = typeStore.get("ServerStreamingCallable");
break;
case BIDI:
rawCallableReturnType = typeStore.get("BidiStreamingCallable");
break;
case NONE:
// Fall through.
default:
rawCallableReturnType = typeStore.get("UnaryCallable");
}
}
// Set generics.
TypeNode returnType =
TypeNode.withReference(
rawCallableReturnType
.reference()
.copyAndSetGenerics(getGenericsForCallable(callableMethodKind, method, typeStore)));
String rawMethodName = JavaStyle.toLowerCamelCase(method.name());
String methodName = getCallableName(callableMethodKind, rawMethodName);
TypeNode stubType = typeStore.get(ClassNames.getServiceStubClassName(service));
MethodInvocationExpr returnExpr =
MethodInvocationExpr.builder()
.setExprReferenceExpr(
VariableExpr.builder()
.setVariable(Variable.builder().setName("stub").setType(stubType).build())
.build())
.setMethodName(methodName)
.setReturnType(returnType)
.build();
Optional<String> sampleCodeOpt = Optional.empty();
if (callableMethodKind.equals(CallableMethodKind.LRO)) {
sampleCodeOpt =
Optional.of(
ServiceClientSampleCodeComposer.composeLroCallableMethodHeaderSampleCode(
method,
typeStore.get(ClassNames.getServiceClientClassName(service)),
resourceNames,
messageTypes));
} else if (callableMethodKind.equals(CallableMethodKind.PAGED)) {
sampleCodeOpt =
Optional.of(
ServiceClientSampleCodeComposer.composePagedCallableMethodHeaderSampleCode(
method,
typeStore.get(ClassNames.getServiceClientClassName(service)),
resourceNames,
messageTypes));
} else if (callableMethodKind.equals(CallableMethodKind.REGULAR)) {
if (method.stream().equals(Stream.NONE)) {
sampleCodeOpt =
Optional.of(
ServiceClientSampleCodeComposer.composeRegularCallableMethodHeaderSampleCode(
method,
typeStore.get(ClassNames.getServiceClientClassName(service)),
resourceNames,
messageTypes));
} else {
sampleCodeOpt =
Optional.of(
ServiceClientSampleCodeComposer.composeStreamCallableMethodHeaderSampleCode(
method,
typeStore.get(ClassNames.getServiceClientClassName(service)),
resourceNames,
messageTypes));
}
}
MethodDefinition.Builder methodDefBuilder = MethodDefinition.builder();
if (method.isDeprecated()) {
methodDefBuilder =
methodDefBuilder.setAnnotations(
Arrays.asList(AnnotationNode.withType(TypeNode.DEPRECATED)));
}
return methodDefBuilder
.setHeaderCommentStatements(
ServiceClientCommentComposer.createRpcCallableMethodHeaderComment(
method, sampleCodeOpt))
.setScope(ScopeNode.PUBLIC)
.setIsFinal(true)
.setName(methodName)
.setReturnType(returnType)
.setReturnExpr(returnExpr)
.build();
}
private static List<MethodDefinition> createBackgroundResourceMethods(
Service service, TypeStore typeStore) {
List<MethodDefinition> methods = new ArrayList<>();
VariableExpr stubVarExpr =
VariableExpr.withVariable(
Variable.builder()
.setType(typeStore.get(ClassNames.getServiceStubClassName(service)))
.setName("stub")
.build());
MethodDefinition closeMethod =
MethodDefinition.builder()
.setIsOverride(true)
.setScope(ScopeNode.PUBLIC)
.setIsFinal(true)
.setReturnType(TypeNode.VOID)
.setName("close")
.setBody(
Arrays.asList(
ExprStatement.withExpr(
MethodInvocationExpr.builder()
.setExprReferenceExpr(stubVarExpr)
.setMethodName("close")
.build())))
.build();
methods.add(closeMethod);
MethodDefinition shutdownMethod =
MethodDefinition.builder()
.setIsOverride(true)
.setScope(ScopeNode.PUBLIC)
.setReturnType(TypeNode.VOID)
.setName("shutdown")
.setBody(
Arrays.asList(
ExprStatement.withExpr(
MethodInvocationExpr.builder()
.setExprReferenceExpr(stubVarExpr)
.setMethodName("shutdown")
.build())))
.build();
methods.add(shutdownMethod);
MethodDefinition isShutdownMethod =
MethodDefinition.builder()
.setIsOverride(true)
.setScope(ScopeNode.PUBLIC)
.setReturnType(TypeNode.BOOLEAN)
.setName("isShutdown")
.setReturnExpr(
MethodInvocationExpr.builder()
.setExprReferenceExpr(stubVarExpr)
.setMethodName("isShutdown")
.setReturnType(TypeNode.BOOLEAN)
.build())
.build();
methods.add(isShutdownMethod);
MethodDefinition isTerminatedMethod =
MethodDefinition.builder()
.setIsOverride(true)
.setScope(ScopeNode.PUBLIC)
.setReturnType(TypeNode.BOOLEAN)
.setName("isTerminated")
.setReturnExpr(
MethodInvocationExpr.builder()
.setExprReferenceExpr(stubVarExpr)
.setMethodName("isTerminated")
.setReturnType(TypeNode.BOOLEAN)
.build())
.build();
methods.add(isTerminatedMethod);