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Annotation based encoder and decoder for Thrift
/*
* Copyright (C) 2012 Facebook, 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 com.facebook.drift.codec.metadata;
import com.facebook.drift.annotations.ThriftDocumentation;
import com.facebook.drift.annotations.ThriftOrder;
import com.facebook.drift.annotations.ThriftStruct;
import com.facebook.drift.annotations.ThriftUnion;
import com.facebook.drift.codec.ThriftProtocolType;
import com.facebook.drift.codec.internal.builtin.OptionalDoubleThriftCodec;
import com.facebook.drift.codec.internal.builtin.OptionalIntThriftCodec;
import com.facebook.drift.codec.internal.builtin.OptionalLongThriftCodec;
import com.facebook.drift.codec.internal.coercion.DefaultJavaCoercions;
import com.facebook.drift.codec.internal.coercion.FromThrift;
import com.facebook.drift.codec.internal.coercion.ToThrift;
import com.facebook.drift.codec.metadata.MetadataErrors.Monitor;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;
import com.google.common.reflect.TypeToken;
import com.google.common.util.concurrent.ListenableFuture;
import javax.annotation.concurrent.ThreadSafe;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.nio.ByteBuffer;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Stream;
import static com.facebook.drift.codec.metadata.ReflectionHelper.getFutureReturnType;
import static com.facebook.drift.codec.metadata.ReflectionHelper.getIterableType;
import static com.facebook.drift.codec.metadata.ReflectionHelper.getMapKeyType;
import static com.facebook.drift.codec.metadata.ReflectionHelper.getMapValueType;
import static com.facebook.drift.codec.metadata.ReflectionHelper.getOptionalType;
import static com.facebook.drift.codec.metadata.ThriftEnumMetadataBuilder.thriftEnumMetadata;
import static com.facebook.drift.codec.metadata.ThriftType.BINARY;
import static com.facebook.drift.codec.metadata.ThriftType.BOOL;
import static com.facebook.drift.codec.metadata.ThriftType.BYTE;
import static com.facebook.drift.codec.metadata.ThriftType.DOUBLE;
import static com.facebook.drift.codec.metadata.ThriftType.I16;
import static com.facebook.drift.codec.metadata.ThriftType.I32;
import static com.facebook.drift.codec.metadata.ThriftType.I64;
import static com.facebook.drift.codec.metadata.ThriftType.STRING;
import static com.facebook.drift.codec.metadata.ThriftType.VOID;
import static com.facebook.drift.codec.metadata.ThriftType.array;
import static com.facebook.drift.codec.metadata.ThriftType.enumType;
import static com.facebook.drift.codec.metadata.ThriftType.list;
import static com.facebook.drift.codec.metadata.ThriftType.map;
import static com.facebook.drift.codec.metadata.ThriftType.optional;
import static com.facebook.drift.codec.metadata.ThriftType.set;
import static com.facebook.drift.codec.metadata.ThriftType.struct;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static java.lang.reflect.Modifier.isStatic;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.joining;
/**
* ThriftCatalog contains the metadata for all known structs, enums and type coercions. Since,
* metadata extraction can be very expensive, and only single instance of the catalog should be
* created.
*/
@ThreadSafe
public final class ThriftCatalog
{
private final MetadataErrors.Monitor monitor;
private final ConcurrentMap structs = new ConcurrentHashMap<>();
private final ConcurrentMap, ThriftEnumMetadata> enums = new ConcurrentHashMap<>();
private final ConcurrentMap coercions = new ConcurrentHashMap<>();
private final ConcurrentMap, ThriftType> manualTypes = new ConcurrentHashMap<>();
private final ConcurrentMap typeCache = new ConcurrentHashMap<>();
/**
* This stack tracks the java Types for which building a ThriftType is in progress (used to
* detect recursion)
*/
private final ThreadLocal> stack = ThreadLocal.withInitial(ArrayDeque::new);
/**
* This queue tracks the Types for which resolution was deferred in order to allow for
* recursive type structures. ThriftTypes for these types will be built after the originally
* requested ThriftType is built and cached.
*/
private final ThreadLocal> deferredTypesWorkList = ThreadLocal.withInitial(ArrayDeque::new);
public ThriftCatalog()
{
this(MetadataErrors.NULL_MONITOR);
}
public ThriftCatalog(Monitor monitor)
{
this.monitor = monitor;
addDefaultCoercions(DefaultJavaCoercions.class);
addThriftType(new OptionalDoubleThriftCodec().getType());
addThriftType(new OptionalIntThriftCodec().getType());
addThriftType(new OptionalLongThriftCodec().getType());
}
@VisibleForTesting
Monitor getMonitor()
{
return monitor;
}
public void addThriftType(ThriftType thriftType)
{
manualTypes.put(TypeToken.of(thriftType.getJavaType()).getRawType(), thriftType);
}
/**
* Add the @ToThrift and @FromThrift coercions in the specified class to this catalog.
* All coercions must be symmetrical, so every @ToThrift method must have a
* corresponding @FromThrift method.
*/
public void addDefaultCoercions(Class coercionsClass)
{
requireNonNull(coercionsClass, "coercionsClass is null");
Map toThriftCoercions = new HashMap<>();
Map fromThriftCoercions = new HashMap<>();
for (Method method : coercionsClass.getDeclaredMethods()) {
if (method.isAnnotationPresent(ToThrift.class)) {
verifyCoercionMethod(method);
ThriftType thriftType = getThriftType(method.getGenericReturnType());
ThriftType coercedType = thriftType.coerceTo(method.getGenericParameterTypes()[0]);
Method oldValue = toThriftCoercions.put(coercedType, method);
checkArgument(
oldValue == null,
"Coercion class two @ToThrift methods (%s and %s) for type %s",
coercionsClass.getName(),
method,
oldValue,
coercedType);
}
else if (method.isAnnotationPresent(FromThrift.class)) {
verifyCoercionMethod(method);
ThriftType thriftType = getThriftType(method.getGenericParameterTypes()[0]);
ThriftType coercedType = thriftType.coerceTo(method.getGenericReturnType());
Method oldValue = fromThriftCoercions.put(coercedType, method);
checkArgument(
oldValue == null,
"Coercion class two @FromThrift methods (%s and %s) for type %s",
coercionsClass.getName(),
method,
oldValue,
coercedType);
}
}
// assure coercions are symmetric
Set difference = Sets.symmetricDifference(toThriftCoercions.keySet(), fromThriftCoercions.keySet());
checkArgument(
difference.isEmpty(),
"Coercion class %s does not have matched @ToThrift and @FromThrift methods for types %s",
coercionsClass.getName(),
difference);
// add the coercions
Map coercions = new HashMap<>();
for (Map.Entry entry : toThriftCoercions.entrySet()) {
ThriftType type = entry.getKey();
Method toThriftMethod = entry.getValue();
Method fromThriftMethod = fromThriftCoercions.get(type);
// this should never happen due to the difference check above, but be careful
checkState(
fromThriftMethod != null,
"Coercion class %s does not have matched @ToThrift and @FromThrift methods for type %s",
coercionsClass.getName(),
type);
TypeCoercion coercion = new TypeCoercion(type, toThriftMethod, fromThriftMethod);
coercions.put(type.getJavaType(), coercion);
}
this.coercions.putAll(coercions);
}
private void verifyCoercionMethod(Method method)
{
checkArgument(isStatic(method.getModifiers()), "Method %s is not static", method.toGenericString());
checkArgument(method.getParameterTypes().length == 1, "Method %s must have exactly one parameter", method.toGenericString());
checkArgument(method.getReturnType() != void.class, "Method %s must have a return value", method.toGenericString());
}
/**
* Gets the default TypeCoercion (and associated ThriftType) for the specified Java type.
*/
public TypeCoercion getDefaultCoercion(Type type)
{
return coercions.get(type);
}
/**
* Gets the ThriftType for the specified Java type. The native Thrift type for the Java type will
* be inferred from the Java type, and if necessary type coercions will be applied.
*
* @return the ThriftType for the specified java type; never null
* @throws IllegalArgumentException if the Java Type can not be coerced to a ThriftType
*/
public ThriftType getThriftType(Type javaType)
throws IllegalArgumentException
{
ThriftType thriftType = getThriftTypeFromCache(javaType);
if (thriftType == null) {
thriftType = buildThriftType(javaType);
}
return thriftType;
}
public ThriftType getThriftTypeFromCache(Type javaType)
{
return typeCache.get(javaType);
}
private ThriftType buildThriftType(Type javaType)
{
ThriftType thriftType = buildThriftTypeInternal(javaType);
typeCache.putIfAbsent(javaType, thriftType);
if (stack.get().isEmpty()) {
// The stack represents the processing of nested types, so when the stack is empty
// at this point, we've just finished processing and caching the originally requested
// type. There may be some unresolved type references we should revisit now.
Deque unresolvedJavaTypes = deferredTypesWorkList.get();
while (!unresolvedJavaTypes.isEmpty()) {
Type unresolvedJavaType = unresolvedJavaTypes.pop();
if (!typeCache.containsKey(unresolvedJavaType)) {
ThriftType resolvedThriftType = buildThriftTypeInternal(unresolvedJavaType);
typeCache.putIfAbsent(unresolvedJavaType, resolvedThriftType);
}
}
}
return thriftType;
}
// This should ONLY be called from buildThriftType()
private ThriftType buildThriftTypeInternal(Type javaType)
throws IllegalArgumentException
{
Class rawType = TypeToken.of(javaType).getRawType();
ThriftType manualType = manualTypes.get(rawType);
if (manualType != null) {
return manualType;
}
if (boolean.class == rawType) {
return BOOL;
}
if (byte.class == rawType) {
return BYTE;
}
if (short.class == rawType) {
return I16;
}
if (int.class == rawType) {
return I32;
}
if (long.class == rawType) {
return I64;
}
if (double.class == rawType) {
return DOUBLE;
}
if (String.class == rawType) {
return STRING;
}
if (ByteBuffer.class.isAssignableFrom(rawType)) {
return BINARY;
}
if (Enum.class.isAssignableFrom(rawType)) {
ThriftEnumMetadata> thriftEnumMetadata = getThriftEnumMetadata(rawType);
return enumType(thriftEnumMetadata);
}
if (rawType.isArray()) {
Class elementType = rawType.getComponentType();
if (elementType == byte.class) {
// byte[] is encoded as BINARY and requires a coercion
return coercions.get(javaType).getThriftType();
}
return array(getCollectionElementThriftTypeReference(elementType));
}
if (Map.class.isAssignableFrom(rawType)) {
Type mapKeyType = getMapKeyType(javaType);
Type mapValueType = getMapValueType(javaType);
return map(getMapKeyThriftTypeReference(mapKeyType), getMapValueThriftTypeReference(mapValueType));
}
if (Set.class.isAssignableFrom(rawType)) {
Type elementType = getIterableType(javaType);
return set(getCollectionElementThriftTypeReference(elementType));
}
if (Iterable.class.isAssignableFrom(rawType)) {
Type elementType = getIterableType(javaType);
return list(getCollectionElementThriftTypeReference(elementType));
}
if (Optional.class.isAssignableFrom(rawType)) {
Type elementType = getOptionalType(javaType);
return optional(getOptionalThriftTypeReference(elementType));
}
// The void type is used by service methods and is encoded as an empty struct
if (void.class.isAssignableFrom(rawType) || Void.class.isAssignableFrom(rawType)) {
return VOID;
}
if (isStructType(rawType)) {
ThriftStructMetadata structMetadata = getThriftStructMetadata(javaType);
// Unions are covered because a union looks like a struct with a single field.
return struct(structMetadata);
}
if (ListenableFuture.class.isAssignableFrom(rawType)) {
Type returnType = getFutureReturnType(javaType);
// TODO: check that we don't recurse through multiple futures
// TODO: find a way to restrict this to return values only
return getThriftType(returnType);
}
// coerce the type if possible
TypeCoercion coercion = coercions.get(javaType);
if (coercion != null) {
return coercion.getThriftType();
}
throw new IllegalArgumentException("Type can not be coerced to a Thrift type: " + javaType);
}
public ThriftTypeReference getFieldThriftTypeReference(FieldMetadata fieldMetadata)
{
Boolean isRecursive = fieldMetadata.isRecursiveReference();
if (isRecursive == null) {
throw new IllegalStateException(
"Field normalization should have set a non-null value for isRecursiveReference");
}
return getThriftTypeReference(
fieldMetadata.getJavaType(),
isRecursive ? Recursiveness.FORCED : Recursiveness.NOT_ALLOWED);
}
public ThriftTypeReference getCollectionElementThriftTypeReference(Type javaType)
{
// Collection element types are always allowed to be recursive links
if (isStructType(javaType)) {
// TODO: This gets things working, but is only necessary when this collection is
// involved in a recursive chain. Otherwise, it's just introducing unnecessary
// references. We should see if we can clean this up.
return getThriftTypeReference(javaType, Recursiveness.FORCED);
}
else {
return getThriftTypeReference(javaType, Recursiveness.NOT_ALLOWED);
}
}
public ThriftTypeReference getMapKeyThriftTypeReference(Type javaType)
{
// Maps key types are always allowed to be recursive links
if (isStructType(javaType)) {
// TODO: This gets things working, but is only necessary when this collection is
// involved in a recursive chain. Otherwise, it's just introducing unnecessary
// references. We should see if we can clean this up.
return getThriftTypeReference(javaType, Recursiveness.FORCED);
}
else {
return getThriftTypeReference(javaType, Recursiveness.NOT_ALLOWED);
}
}
public ThriftTypeReference getMapValueThriftTypeReference(Type javaType)
{
// Maps value types are always allowed to be recursive links
if (isStructType(javaType)) {
// TODO: This gets things working, but is only necessary when this collection is
// involved in a recursive chain. Otherwise, it's just introducing unnecessary
// references. We should see if we can clean this up.
return getThriftTypeReference(javaType, Recursiveness.FORCED);
}
else {
return getThriftTypeReference(javaType, Recursiveness.NOT_ALLOWED);
}
}
public ThriftTypeReference getOptionalThriftTypeReference(Type javaType)
{
// Optional types are always allowed to be recursive links
if (isStructType(javaType)) {
// TODO: This gets things working, but is only necessary when this collection is
// involved in a recursive chain. Otherwise, it's just introducing unnecessary
// references. We should see if we can clean this up.
return getThriftTypeReference(javaType, Recursiveness.FORCED);
}
else {
return getThriftTypeReference(javaType, Recursiveness.NOT_ALLOWED);
}
}
private ThriftTypeReference getThriftTypeReference(Type javaType, Recursiveness recursiveness)
{
ThriftType thriftType = getThriftTypeFromCache(javaType);
if (thriftType == null) {
if (recursiveness == Recursiveness.FORCED ||
(recursiveness == Recursiveness.ALLOWED && stack.get().contains(javaType))) {
// recursion: return an unresolved ThriftTypeReference
deferredTypesWorkList.get().add(javaType);
return new RecursiveThriftTypeReference(this, javaType);
}
else {
thriftType = buildThriftType(javaType);
typeCache.putIfAbsent(javaType, thriftType);
}
}
return new DefaultThriftTypeReference(thriftType);
}
public boolean isSupportedStructFieldType(Type javaType)
{
return getThriftProtocolType(javaType) != ThriftProtocolType.UNKNOWN;
}
public ThriftProtocolType getThriftProtocolType(Type javaType)
{
ThriftType manualType = manualTypes.get(javaType);
if (manualType != null) {
return manualType.getProtocolType();
}
Class rawType = TypeToken.of(javaType).getRawType();
if (boolean.class == rawType) {
return ThriftProtocolType.BOOL;
}
if (byte.class == rawType) {
return ThriftProtocolType.BYTE;
}
if (short.class == rawType) {
return ThriftProtocolType.I16;
}
if (int.class == rawType) {
return ThriftProtocolType.I32;
}
if (long.class == rawType) {
return ThriftProtocolType.I64;
}
if (double.class == rawType) {
return ThriftProtocolType.DOUBLE;
}
if (String.class == rawType) {
return ThriftProtocolType.STRING;
}
if (ByteBuffer.class.isAssignableFrom(rawType)) {
return ThriftProtocolType.BINARY;
}
if (Enum.class.isAssignableFrom(rawType)) {
return ThriftProtocolType.ENUM;
}
if (rawType.isArray()) {
Class elementType = rawType.getComponentType();
if (isSupportedArrayComponentType(elementType)) {
return ThriftProtocolType.LIST;
}
}
if (Map.class.isAssignableFrom(rawType)) {
Type mapKeyType = getMapKeyType(javaType);
Type mapValueType = getMapValueType(javaType);
if (isSupportedStructFieldType(mapKeyType) &&
isSupportedStructFieldType(mapValueType)) {
return ThriftProtocolType.MAP;
}
}
if (Set.class.isAssignableFrom(rawType)) {
Type elementType = getIterableType(javaType);
if (isSupportedStructFieldType(elementType)) {
return ThriftProtocolType.SET;
}
}
if (Iterable.class.isAssignableFrom(rawType)) {
Type elementType = getIterableType(javaType);
if (isSupportedStructFieldType(elementType)) {
return ThriftProtocolType.LIST;
}
}
if (Optional.class.isAssignableFrom(rawType)) {
Type elementType = getOptionalType(javaType);
return getThriftProtocolType(elementType);
}
if (isStructType(rawType)) {
return ThriftProtocolType.STRUCT;
}
// NOTE: void is not a supported struct type
// coerce the type if possible
TypeCoercion coercion = coercions.get(javaType);
if (coercion != null) {
return coercion.getThriftType().getProtocolType();
}
return ThriftProtocolType.UNKNOWN;
}
public static boolean isStructType(Type javaType)
{
Class rawType = TypeToken.of(javaType).getRawType();
return rawType.isAnnotationPresent(ThriftStruct.class) || rawType.isAnnotationPresent(ThriftUnion.class);
}
public boolean isSupportedArrayComponentType(Class componentType)
{
return boolean.class == componentType ||
byte.class == componentType ||
short.class == componentType ||
int.class == componentType ||
long.class == componentType ||
double.class == componentType;
}
/**
* Gets the ThriftEnumMetadata for the specified enum class. If the enum class contains a method
* annotated with @ThriftEnumValue, the value of this method will be used for the encoded thrift
* value; otherwise the Enum.ordinal() method will be used.
*/
public > ThriftEnumMetadata getThriftEnumMetadata(Class enumClass)
{
checkArgument(enumClass.isEnum(), "Class %s is not an enum", enumClass.getName());
ThriftEnumMetadata enumMetadata = enums.get(enumClass);
if (enumMetadata == null) {
enumMetadata = thriftEnumMetadata((Class) enumClass);
ThriftEnumMetadata current = enums.putIfAbsent(enumClass, enumMetadata);
if (current != null) {
enumMetadata = current;
}
}
return enumMetadata;
}
/**
* Gets the ThriftStructMetadata for the specified struct class. The struct class must be
* annotated with @ThriftStruct or @ThriftUnion.
*/
public ThriftStructMetadata getThriftStructMetadata(Type structType)
{
ThriftStructMetadata structMetadata = structs.get(structType);
Class structClass = TypeToken.of(structType).getRawType();
if (structMetadata == null) {
if (structClass.isAnnotationPresent(ThriftStruct.class)) {
structMetadata = extractThriftStructMetadata(structType);
}
else if (structClass.isAnnotationPresent(ThriftUnion.class)) {
structMetadata = extractThriftUnionMetadata(structType);
}
else {
throw new IllegalStateException("getThriftStructMetadata called on a class that has no @ThriftStruct or @ThriftUnion annotation");
}
ThriftStructMetadata current = structs.putIfAbsent(structType, structMetadata);
if (current != null) {
structMetadata = current;
}
}
return structMetadata;
}
private static Class getDriftMetaClassOf(Class cls)
throws ClassNotFoundException
{
ClassLoader loader = cls.getClassLoader();
if (loader == null) {
throw new ClassNotFoundException("null class loader");
}
return loader.loadClass(cls.getName() + "$DriftMeta");
}
@SuppressWarnings("PMD.EmptyCatchBlock")
public static ImmutableList getThriftDocumentation(Class objectClass)
{
ThriftDocumentation documentation = objectClass.getAnnotation(ThriftDocumentation.class);
if (documentation == null) {
try {
Class docsClass = getDriftMetaClassOf(objectClass);
documentation = docsClass.getAnnotation(ThriftDocumentation.class);
}
catch (ClassNotFoundException e) {
// ignored
}
}
return documentation == null ? ImmutableList.of() : ImmutableList.copyOf(documentation.value());
}
@SuppressWarnings("PMD.EmptyCatchBlock")
public static ImmutableList getThriftDocumentation(Method method)
{
ThriftDocumentation documentation = method.getAnnotation(ThriftDocumentation.class);
if (documentation == null) {
try {
Class docsClass = getDriftMetaClassOf(method.getDeclaringClass());
documentation = docsClass.getDeclaredMethod(method.getName()).getAnnotation(ThriftDocumentation.class);
}
catch (ReflectiveOperationException e) {
// ignored
}
}
return documentation == null ? ImmutableList.of() : ImmutableList.copyOf(documentation.value());
}
@SuppressWarnings("PMD.EmptyCatchBlock")
public static ImmutableList getThriftDocumentation(Field field)
{
ThriftDocumentation documentation = field.getAnnotation(ThriftDocumentation.class);
if (documentation == null) {
try {
Class docsClass = getDriftMetaClassOf(field.getDeclaringClass());
documentation = docsClass.getDeclaredField(field.getName()).getAnnotation(ThriftDocumentation.class);
}
catch (ReflectiveOperationException e) {
// ignored
}
}
return documentation == null ? ImmutableList.of() : ImmutableList.copyOf(documentation.value());
}
@SuppressWarnings("PMD.EmptyCatchBlock")
public static > ImmutableList getThriftDocumentation(Enum enumConstant)
{
try {
Field f = enumConstant.getDeclaringClass().getField(enumConstant.name());
return getThriftDocumentation(f);
}
catch (ReflectiveOperationException e) {
// ignore
}
return ImmutableList.of();
}
@SuppressWarnings("PMD.EmptyCatchBlock")
public static Optional getMethodOrder(Method method)
{
ThriftOrder order = method.getAnnotation(ThriftOrder.class);
if (order == null) {
try {
Class docsClass = getDriftMetaClassOf(method.getDeclaringClass());
order = docsClass.getDeclaredMethod(method.getName()).getAnnotation(ThriftOrder.class);
}
catch (ReflectiveOperationException e) {
// ignored
}
}
return order == null ? Optional.empty() : Optional.of(order.value());
}
private ThriftStructMetadata extractThriftStructMetadata(Type structType)
{
requireNonNull(structType, "structType is null");
Deque stack = this.stack.get();
if (stack.contains(structType)) {
String path = Stream.concat(stack.stream(), Stream.of(structType))
.map(type -> TypeToken.of(type).getRawType().getName())
.collect(joining("->"));
throw new IllegalArgumentException(
"Circular references must be qualified with 'isRecursive' on a @ThriftField annotation in the cycle: " + path);
}
else {
stack.push(structType);
try {
ThriftStructMetadataBuilder builder = new ThriftStructMetadataBuilder(this, structType);
return builder.build();
}
finally {
Type top = stack.pop();
checkState(
structType.equals(top),
"ThriftCatalog circularity detection stack is corrupt: expected %s, but got %s",
structType,
top);
}
}
}
private ThriftStructMetadata extractThriftUnionMetadata(Type unionType)
{
requireNonNull(unionType, "unionType is null");
Deque stack = this.stack.get();
if (stack.contains(unionType)) {
String path = Stream.concat(stack.stream(), Stream.of(unionType))
.map(type -> TypeToken.of(type).getRawType().getName())
.collect(joining("->"));
throw new IllegalArgumentException(
"Circular references must be qualified with 'isRecursive' on a @ThriftField annotation in the cycle: " + path);
}
stack.push(unionType);
try {
ThriftUnionMetadataBuilder builder = new ThriftUnionMetadataBuilder(this, unionType);
return builder.build();
}
finally {
Type top = stack.pop();
checkState(
unionType.equals(top),
"ThriftCatalog circularity detection stack is corrupt: expected %s, but got %s",
unionType,
top);
}
}
enum Recursiveness
{
NOT_ALLOWED,
ALLOWED,
FORCED,
}
}
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