com.google.inject.MembersInjector#com.google.inject.spi.InjectionPoint源码实例Demo

private void injectValues(final Object target, final boolean sharedFields) throws IllegalAccessException {
    for (InjectionPoint point : injectionPoints) {
        if (!(point.getMember() instanceof Field)) {
            throw new GuiceyExtensionException("Method injection is not supported; use field injection instead");
        }

        final Field field = (Field) point.getMember();
        if (field.isAnnotationPresent(Shared.class) != sharedFields) {
            continue;
        }

        final Object value = injector.getInstance(point.getDependencies().get(0).getKey());
        field.setAccessible(true);
        field.set(target, value);
    }
    // ClientSupport fields
    SpecialFieldsSupport.initClients(target, clientFields, support.getClient(), sharedFields);
}
 

/**
 * Return all direct dependencies injected into the given type
 */
public static Stream<Dependency<?>> dependencies(Class<?> type) {
    return Stream.concat(
        Stream.of(InjectionPoint.forConstructorOf(type)),
        InjectionPoint.forInstanceMethodsAndFields(type).stream()
    ).flatMap(ip -> ip.getDependencies().stream());
}
 

private <D> InjectableMethod(@Nullable TypeLiteral<D> targetType, @Nullable D target, Method method, @Nullable T result) {
    final Errors errors = new Errors(method);

    if(Members.isStatic(method)) {
        checkArgument(target == null);
    } else {
        checkArgument(target != null);
    }

    targetType = targetType(targetType, target, method);

    checkArgument(method.getDeclaringClass().isAssignableFrom(targetType.getRawType()));

    this.method = method;
    this.dependencies = ImmutableSet.copyOf(InjectionPoint.forMethod(method, targetType).getDependencies());

    if(result != null) {
        this.result = result;
        this.providedKey = Keys.forInstance(result);
    } else {
        final TypeLiteral<T> returnType = (TypeLiteral<T>) targetType.getReturnType(method);
        if(!Void.class.equals(returnType.getRawType())) {
            final Annotation qualifier = Annotations.findBindingAnnotation(errors, method, method.getAnnotations());
            this.result = null;
            this.providedKey = Keys.get(returnType, qualifier);
        } else {
            this.result = (T) this;
            this.providedKey = Keys.forInstance(this.result);
        }
    }

    this.scope = Annotations.findScopeAnnotation(errors, method.getAnnotations());

    MethodHandle handle = MethodHandleUtils.privateUnreflect(method);
    if(target != null) {
        handle = handle.bindTo(target);
    }
    this.handle = handle;
}
 

public DependencyCollector log(Logger logger, Level level) {
    logger.log(level, "Dumping all dependencies:");
    for(Map.Entry<TypeLiteral<?>, Collection<InjectionPoint>> entry : injectionPointsByType().asMap().entrySet()) {
        logger.log(level, entry.getKey().toString());
        for(InjectionPoint ip : entry.getValue()) {
            logger.log(level, "  " + ip.getMember());
            for(Dependency<?> dep : dependenciesByInjectionPoint().get(ip)) {
                logger.log(level, "    " + dep);
            }
        }
    }
    return this;
}
 

@Inject public MemberInjectingFactory(TypeLiteral<T> type, MembersInjector<T> injector) {
    this.type = type;
    this.injector = injector;
    this.injectionPoint = InjectionPoint.forConstructorOf(type);
    this.constructor = (Constructor<T>) injectionPoint.getMember();
    this.constructor.setAccessible(true);

    dependencies.addAll(Dependency.forInjectionPoints(InjectionPoint.forInstanceMethodsAndFields(type)));
}
 

public static void checkInjectableCGLibProxyBase(Class<?> cls) {
    InjectionPoint.forInstanceMethodsAndFields(cls).forEach(ip -> {
        if(ip.getMember() instanceof Method && !Modifier.isPrivate(ip.getMember().getModifiers())) {
            // CGLib proxies override all non-private methods on the base class,
            // and do not copy method annotations, so Guice will not find the
            // @Inject annotation on the base method. Declaring the method
            // private works around this. The proxy will not try to override
            // private methods, and Guice can find them just fine.
            throw new MethodFormException(
                (Method) ip.getMember(),
                "Injected method on CGLib proxied class must be private (see exception site for details)"
            );
        }
    });
}
 

public GuiceyInterceptor(final SpecInfo spec, final EnvironmentSupport support,
                         final List<GuiceyConfigurationHook> hooks) {
    this.support = support;
    this.hooks = hooks;
    injectionPoints = InjectionPoint.forInstanceMethodsAndFields(spec.getReflection());
    clientFields = SpecialFieldsSupport.findClientFields(spec.getReflection());
}
 

public static <T> Constructor<T> injectableConstructor(TypeLiteral<T> type) {
    return (Constructor<T>) InjectionPoint.forConstructorOf(type).getMember();
}
 

private void processInjectionPoint(InjectionPoint injectionPoint) {
    injectionPointsByType.put(injectionPoint.getDeclaringType(), injectionPoint);
    injectionPoint.getDependencies().forEach(this::processDependency);
}
 

private void processInjectionPoints(Iterable<InjectionPoint> injectionPoint) {
    injectionPoint.forEach(this::processInjectionPoint);
}
 

private void processInstanceInjections(TypeLiteral<?> type) {
    InjectionPoint.forInstanceMethodsAndFields(type).forEach(this::processInjectionPoint);
}
 

private void processInjections(TypeLiteral<?> type) {
    processInjectionPoint(InjectionPoint.forConstructorOf(type));
    processInstanceInjections(type);
}
 

public static Stream<Dependency<?>> forInstanceMethodsAndFields(TypeLiteral<?> type) {
    return InjectionPoint.forInstanceMethodsAndFields(type)
                         .stream()
                         .flatMap(point -> point.getDependencies().stream());
}
 

@Override
public Void visit(ConstructorBinding<? extends T> binding) {
    final InjectionPoint point = binding.getConstructor();
    scope(binding, rebind(binding).toConstructor((Constructor) point.getMember(), point.getDeclaringType()));
    return null;
}
 

@Override
protected void configure() {
    final InjectionPoint point = InjectionPoint.forConstructorOf(innerType);
    final Constructor<I> constructor = (Constructor<I>) point.getMember();
    constructor.setAccessible(true);

    if(point.getDependencies().isEmpty() || !Types.isAssignable(point.getDependencies().get(0).getKey().getTypeLiteral(), outerType)) {
        addError("Expected %s to take %s as the first parameter of its injectable constructor", innerType, outerType);
        return;
    }

    final Set<Dependency<?>> dependencies = point.getDependencies()
                                                 .stream()
                                                 .skip(1)
                                                 .collect(Collectors.toImmutableSet());

    final List<Provider<?>> providers = dependencies.stream()
                                                    .map(dep -> getProvider(dep.getKey()))
                                                    .collect(Collectors.toImmutableList());

    final MembersInjector<I> membersInjector = getMembersInjector(innerType);

    class FactoryImpl implements InnerFactory<O, I>, HasDependencies {
        @Override
        public Set<Dependency<?>> getDependencies() {
            return dependencies;
        }

        public I create(O outer) {
            final Object[] args = new Object[providers.size() + 1];

            args[0] = outer;

            for(int i = 0; i < providers.size(); i++) {
                args[i + 1] = providers.get(i).get();
            }

            return Injection.wrappingExceptions(() -> {
                final I instance = constructor.newInstance(args);
                membersInjector.injectMembers(instance);
                return instance;
            });
        }
    }

    bind(factoryKey).toInstance(new FactoryImpl());
}
 

@Override public <T> Key<T> prepareMethod(Binder binder, Annotation annotation, Key<T> key, InjectionPoint injectionPoint) { return key; } 

public SetMultimap<InjectionPoint, Dependency<?>> dependenciesByInjectionPoint() { return dependenciesByInjectionPoint; } 

public SetMultimap<TypeLiteral<?>, InjectionPoint> injectionPointsByType() { return injectionPointsByType; }