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[SERIALIZATION] ClusterBean
Serialization
#1710
Comments
@garyparrot 我想確認一下,在 benchmark 中應該還是會用到 @chinghongfang 可否也看一下? |
我幾個小時前有想到這種方案,我想概念上應該是可行的。如果走上這條路的話,我想我們的序列化檔案裡面可能是存類似 |
感謝確認,直覺上的風險是 sensor 並不接受“過時“的 bean object ? |
感謝提醒,我忘了 不過,透過過濾產新 Metrics 的這個過程,這樣出來的成品好像已經不是 |
沒錯,就是這點讓我擔心。嚴格上來說這是一段「運算過程」,而這個運算過程如果會跟「時間」有關的話,那麼過時的BeanObject就可能導致錯誤。 不過另一個角度是說,如果運算過程會在意資料過時,那麼可能連算成本的時候都會在意資料過時,那可能該cost function 就無法用來做benchmark了 我第一個想到可能會有這個問題的就是「流量成本」, @qoo332001 可否麻煩你也協助確認一下? |
或是說回去嘗試序列化整個 import org.astraea.common.metrics.BeanObject;
import org.astraea.common.metrics.HasBeanObject;
import org.astraea.common.metrics.broker.HasGauge;
import org.astraea.common.metrics.connector.ConnectorInfo;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
import java.lang.invoke.LambdaMetafactory;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.Map;
public class IgnoreInvokeDynamic {
@Test
@Disabled
void testInvokeDynamic() throws Throwable {
{
// these two variables come from the deserialization result
var deserializedBeanObject = new BeanObject("Domain", Map.of("Hello", "World"), Map.of());
var targetInterface = HasGauge.class;
run(deserializedBeanObject, targetInterface);
}
{
// these two variables come from the deserialization result
var deserializedBeanObject = new BeanObject("Domain", Map.of("Hello", "5566"), Map.of());
var targetInterface = ConnectorInfo.class;
run(deserializedBeanObject, targetInterface);
}
}
void run(BeanObject beanObject, Class<?> typeInterface) throws Throwable {
if(!typeInterface.isInterface())
throw new IllegalArgumentException("The given type has to be interface");
if(typeInterface.isAssignableFrom(HasBeanObject.class))
throw new IllegalArgumentException("The target interface must be assignable from HasBeanObject");
// dynamically create an object with that target type:
// this will work as long as the target type is a functional interface and
// original object didn't store state somewhere else
var callsite = LambdaMetafactory.metafactory(
MethodHandles.lookup(),
"beanObject",
MethodType.methodType(typeInterface, BeanObject.class),
MethodType.methodType(BeanObject.class),
MethodHandles.lookup().findStatic(this.getClass(), "call", MethodType.methodType(BeanObject.class, BeanObject.class)),
MethodType.methodType(BeanObject.class));
var deserializedHasBeanObject = (HasBeanObject) callsite.getTarget().invoke(beanObject);
System.out.println(deserializedHasBeanObject.beanObject());
System.out.println(deserializedHasBeanObject.getClass());
System.out.println(deserializedHasBeanObject.getClass().getInterfaces()[0].getName());
System.out.println(deserializedHasBeanObject instanceof HasBeanObject);
System.out.println(typeInterface.isAssignableFrom(deserializedHasBeanObject.getClass()));
System.out.println();
}
static BeanObject call(BeanObject capture) {
return capture;
}
}
|
這個方案會變成「動態產生的物件」也需要被序列化保存,這個方案在相容性上會有些麻煩,出錯的時候也很難debug,我比較偏向只序列化「固定的物件」也就是 BeanObject,當然這個也有副作用就是前面提到如果有cost很在意當下時間的beans就會出問題...但目前應該沒有這種例子? |
同意這段,如果 Client 沒有對應的 Interface Class 會有恢復上的問題,之前測試的時候也發現這個做法
剛剛檢查了一下,目前沒有這種例子 |
@garyparrot 如果你同意這個做法的話,麻煩說個 +1 :) |
這個做法有他的疑慮,不過 +1 :3 |
@garyparrot 感謝回應 @Haser0305 @chaohengstudent 這部分的序列化設計可以麻煩你們實作嗎? |
好的,沒問題 |
#1506 重複 |
未來 #1693 會有序列化/反序列化
ClusterBean
的需求。這個 Issue 用來討論該如何實作這個需求。
目前最主要的問題是
ClusterBean
內部的變數Map<Integer, Collection<HasBeanObject>>
,這個變數中有用到HasBeanObject
,這個物件目前是一個 Interface,專案內有許多HasBeanObject
是透過 lambda 而非 class 的方式來建立,由於 lambda 建立的 class 是匿名的,我們很難在別的 JVM 上重建這個匿名的 type。The text was updated successfully, but these errors were encountered: