泛化调用的核心实现类GenericImplFilter，
消费端:GenericImplFilter将泛化参数进行校验，
image.png
GenericImplFilter核心代码
public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
String generic = invoker.getUrl().getParameter(Constants.GENERIC_KEY);
//如果是自己编写的泛化调用，则invocation是需要调用的接口的子类所以不会走这个判断
if (ProtocolUtils.isGeneric(generic)
&& !Constants.$INVOKE.equals(invocation.getMethodName())
&& invocation instanceof RpcInvocation) {
RpcInvocation invocation2 = (RpcInvocation) invocation;
String methodName = invocation2.getMethodName();
Class<?>[] parameterTypes = invocation2.getParameterTypes();
Object[] arguments = invocation2.getArguments();
String[] types = new String[parameterTypes.length];
for (int i = 0; i < parameterTypes.length; i++) {
types[i] = ReflectUtils.getName(parameterTypes[i]);
}
Object[] args;
if (ProtocolUtils.isBeanGenericSerialization(generic)) {
args = new Object[arguments.length];
for (int i = 0; i < arguments.length; i++) {
args[i] = JavaBeanSerializeUtil.serialize(arguments[i], JavaBeanAccessor.METHOD);
}
} else {
args = PojoUtils.generalize(arguments);
}
invocation2.setMethodName(Constants.$INVOKE);
invocation2.setParameterTypes(GENERIC_PARAMETER_TYPES);
invocation2.setArguments(new Object[]{methodName, types, args});
Result result = invoker.invoke(invocation2);
if (!result.hasException()) {
Object value = result.getValue();
try {
Method method = invoker.getInterface().getMethod(methodName, parameterTypes);
if (ProtocolUtils.isBeanGenericSerialization(generic)) {
if (value == null) {
return new RpcResult(value);
} else if (value instanceof JavaBeanDescriptor) {
return new RpcResult(JavaBeanSerializeUtil.deserialize((JavaBeanDescriptor) value));
} else {
throw new RpcException(
"The type of result value is " +
value.getClass().getName() +
" other than " +
JavaBeanDescriptor.class.getName() +
", and the result is " +
value);
}
} else {
return new RpcResult(PojoUtils.realize(value, method.getReturnType(), method.getGenericReturnType()));
}
} catch (NoSuchMethodException e) {
throw new RpcException(e.getMessage(), e);
}
} else if (result.getException() instanceof GenericException) {
GenericException exception = (GenericException) result.getException();
try {
String className = exception.getExceptionClass();
Class<?> clazz = ReflectUtils.forName(className);
Throwable targetException = null;
Throwable lastException = null;
try {
targetException = (Throwable) clazz.newInstance();
} catch (Throwable e) {
lastException = e;
for (Constructor<?> constructor : clazz.getConstructors()) {
try {
targetException = (Throwable) constructor.newInstance(new Object[constructor.getParameterTypes().length]);
break;
} catch (Throwable e1) {
lastException = e1;
}
}
}
if (targetException != null) {
try {
Field field = Throwable.class.getDeclaredField("detailMessage");
if (!field.isAccessible()) {
field.setAccessible(true);
}
field.set(targetException, exception.getExceptionMessage());
} catch (Throwable e) {
logger.warn(e.getMessage(), e);
}
result = new RpcResult(targetException);
} else if (lastException != null) {
throw lastException;
}
} catch (Throwable e) {
throw new RpcException("Can not deserialize exception " + exception.getExceptionClass() + ", message: " + exception.getExceptionMessage(), e);
}
}
return result;
}
if (invocation.getMethodName().equals(Constants.$INVOKE)
&& invocation.getArguments() != null
&& invocation.getArguments().length == 3
&& ProtocolUtils.isGeneric(generic)) {
Object[] args = (Object[]) invocation.getArguments()[2];
if (ProtocolUtils.isJavaGenericSerialization(generic)) {
for (Object arg : args) {
if (!(byte[].class == arg.getClass())) {
error(generic, byte[].class.getName(), arg.getClass().getName());
}
}
} else if (ProtocolUtils.isBeanGenericSerialization(generic)) {
for (Object arg : args) {
if (!(arg instanceof JavaBeanDescriptor)) {
error(generic, JavaBeanDescriptor.class.getName(), arg.getClass().getName());
}
}
}
((RpcInvocation) invocation).setAttachment(
Constants.GENERIC_KEY, invoker.getUrl().getParameter(Constants.GENERIC_KEY));
}
return invoker.invoke(invocation);
}
服务端:GenericFilter将繁华参数进行反序列化，然后把请求转发给具体的服务进行执行。
image.png
public Result invoke(Invoker<?> invoker, Invocation inv) throws RpcException {
if (inv.getMethodName().equals(Constants.$INVOKE)
&& inv.getArguments() != null
&& inv.getArguments().length == 3
&& !GenericService.class.isAssignableFrom(invoker.getInterface())) {
String name = ((String) inv.getArguments()[0]).trim();
String[] types = (String[]) inv.getArguments()[1];
Object[] args = (Object[]) inv.getArguments()[2];
try {
Method method = ReflectUtils.findMethodByMethodSignature(invoker.getInterface(), name, types);
Class<?>[] params = method.getParameterTypes();
if (args == null) {
args = new Object[params.length];
}
String generic = inv.getAttachment(Constants.GENERIC_KEY);
if (StringUtils.isBlank(generic)) {
generic = RpcContext.getContext().getAttachment(Constants.GENERIC_KEY);
}
if (StringUtils.isEmpty(generic)
|| ProtocolUtils.isDefaultGenericSerialization(generic)) {
args = PojoUtils.realize(args, params, method.getGenericParameterTypes());
} else if (ProtocolUtils.isJavaGenericSerialization(generic)) {
for (int i = 0; i < args.length; i++) {
if (byte[].class == args[i].getClass()) {
try(UnsafeByteArrayInputStream is = new UnsafeByteArrayInputStream((byte[]) args[i])) {
args[i] = ExtensionLoader.getExtensionLoader(Serialization.class)
.getExtension(Constants.GENERIC_SERIALIZATION_NATIVE_JAVA)
.deserialize(null, is).readObject();
} catch (Exception e) {
throw new RpcException("Deserialize argument [" + (i + 1) + "] failed.", e);
}
} else {
throw new RpcException(
"Generic serialization [" +
Constants.GENERIC_SERIALIZATION_NATIVE_JAVA +
"] only support message type " +
byte[].class +
" and your message type is " +
args[i].getClass());
}
}
} else if (ProtocolUtils.isBeanGenericSerialization(generic)) {
for (int i = 0; i < args.length; i++) {
if (args[i] instanceof JavaBeanDescriptor) {
args[i] = JavaBeanSerializeUtil.deserialize((JavaBeanDescriptor) args[i]);
} else {
throw new RpcException(
"Generic serialization [" +
Constants.GENERIC_SERIALIZATION_BEAN +
"] only support message type " +
JavaBeanDescriptor.class.getName() +
" and your message type is " +
args[i].getClass().getName());
}
}
}
Result result = invoker.invoke(new RpcInvocation(method, args, inv.getAttachments()));
if (result.hasException()
&& !(result.getException() instanceof GenericException)) {
return new RpcResult(new GenericException(result.getException()));
}
if (ProtocolUtils.isJavaGenericSerialization(generic)) {
try {
UnsafeByteArrayOutputStream os = new UnsafeByteArrayOutputStream(512);
ExtensionLoader.getExtensionLoader(Serialization.class)
.getExtension(Constants.GENERIC_SERIALIZATION_NATIVE_JAVA)
.serialize(null, os).writeObject(result.getValue());
return new RpcResult(os.toByteArray());
} catch (IOException e) {
throw new RpcException("Serialize result failed.", e);
}
} else if (ProtocolUtils.isBeanGenericSerialization(generic)) {
return new RpcResult(JavaBeanSerializeUtil.serialize(result.getValue(), JavaBeanAccessor.METHOD));
} else {
return new RpcResult(PojoUtils.generalize(result.getValue()));
}
} catch (NoSuchMethodException e) {
throw new RpcException(e.getMessage(), e);
} catch (ClassNotFoundException e) {
throw new RpcException(e.getMessage(), e);
}
}
return invoker.invoke(inv);
}
网友评论