public <T> AccumulatorStateSerializer<T> generateStateSerializer(
Class<T> clazz, DynamicClassLoader classLoader) {
AccumulatorStateMetadata metadata = getMetadataAnnotation(clazz);
if (metadata != null && metadata.stateSerializerClass() != void.class) {
try {
return (AccumulatorStateSerializer<T>)
metadata.stateSerializerClass().getConstructor().newInstance();
} catch (InstantiationException
| IllegalAccessException
| NoSuchMethodException
| InvocationTargetException e) {
throw Throwables.propagate(e);
}
}
ClassDefinition definition =
new ClassDefinition(
a(PUBLIC, FINAL),
makeClassName(clazz.getSimpleName() + "Serializer"),
type(Object.class),
type(AccumulatorStateSerializer.class));
CallSiteBinder callSiteBinder = new CallSiteBinder();
// Generate constructor
definition.declareDefaultConstructor(a(PUBLIC));
List<StateField> fields = enumerateFields(clazz);
generateGetSerializedType(definition, fields, callSiteBinder);
generateSerialize(definition, clazz, fields);
generateDeserialize(definition, clazz, fields);
Class<? extends AccumulatorStateSerializer> serializerClass =
defineClass(
definition,
AccumulatorStateSerializer.class,
callSiteBinder.getBindings(),
classLoader);
try {
return (AccumulatorStateSerializer<T>) serializerClass.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw Throwables.propagate(e);
}
}
private static Class<?> generateArrayConstructor(List<Class<?>> stackTypes, Type elementType) {
List<String> stackTypeNames =
stackTypes.stream().map(Class::getSimpleName).collect(toImmutableList());
ClassDefinition definition =
new ClassDefinition(
a(PUBLIC, FINAL),
CompilerUtils.makeClassName(Joiner.on("").join(stackTypeNames) + "ArrayConstructor"),
type(Object.class));
// Generate constructor
definition.declareDefaultConstructor(a(PRIVATE));
// Generate arrayConstructor()
ImmutableList.Builder<Parameter> parameters = ImmutableList.builder();
for (int i = 0; i < stackTypes.size(); i++) {
Class<?> stackType = stackTypes.get(i);
parameters.add(arg("arg" + i, stackType));
}
MethodDefinition method =
definition.declareMethod(
a(PUBLIC, STATIC), "arrayConstructor", type(Slice.class), parameters.build());
Scope scope = method.getScope();
Block body = method.getBody();
Variable elementTypeVariable = scope.declareVariable(Type.class, "elementTypeVariable");
CallSiteBinder binder = new CallSiteBinder();
body.comment("elementTypeVariable = elementType;")
.append(constantType(binder, elementType))
.putVariable(elementTypeVariable);
Variable valuesVariable = scope.declareVariable(List.class, "values");
body.comment("List<Object> values = new ArrayList();")
.newObject(ArrayList.class)
.dup()
.invokeConstructor(ArrayList.class)
.putVariable(valuesVariable);
for (int i = 0; i < stackTypes.size(); i++) {
body.comment("values.add(arg%d);", i)
.getVariable(valuesVariable)
.append(scope.getVariable("arg" + i));
Class<?> stackType = stackTypes.get(i);
if (stackType.isPrimitive()) {
body.append(ByteCodeUtils.boxPrimitiveIfNecessary(scope, stackType));
}
body.invokeInterface(List.class, "add", boolean.class, Object.class);
}
body.comment("return toStackRepresentation(values, elementType);")
.getVariable(valuesVariable)
.getVariable(elementTypeVariable)
.invokeStatic(ArrayType.class, "toStackRepresentation", Slice.class, List.class, Type.class)
.retObject();
return defineClass(
definition,
Object.class,
binder.getBindings(),
new DynamicClassLoader(ArrayConstructor.class.getClassLoader()));
}