“`
class MyClass
{
public void methodA() {
this.methodB();
}

@Cacheable(“myCache”)
public String methodB() {
// Perform some heavy computation / database access
return “Result”;
}
}

// Autogenerated
class MyClassCGLIBProxy extends MyClass
{

public String methodB() {
String cached = readFromCache();
if (cached != null)
{
return cached;
}
return base.methodB();
}
}

MyClass myClassObject = container.Create(); // container actually creates MyClassCGLIBProxy here

myClass.methodB(); // overriden in MyClassCGLIBProxy therefore cached
myClass.methodA(); // even if the call to methodB happens within an object itself it should still hit the overriden version, which is MyClassCGLIBProxy.methodB
“`

But I guess Spring manages this somehow differently then?

Thank you for your great question.

When a method in Spring is decorated with annotations like @Cacheable or any other that influences behavior, Spring creates a proxy to handle these interactions. This proxy acts as an intermediary, enhancing the functionality of the original method when it is called from outside the class. However, when methods within the same class call each other directly (i.e., using this.method()), they bypass the proxy and invoke the original methods directly. Therefore, the enhanced functionality provided by the proxy, such as caching or transaction management, only applies when the method is accessed externally, not from internal calls within the class itself.

To sum up, the key here is that the proxied (“overriden”) methods will only on interaction from the “outside world”, while original code (from inside world) will not interact with the proxied version of the class.

Thank you.

Afaik this what e.g. a redis pub sub would behave like – so I guess not that unusual.

Yes and no. You cannot block the notification until there’s a listener. It be more like UDP.

Fully possible, but it takes out some of the simplicity of just using Postgres.

Most effective is to adjust the Postgres setting for allowed connections. But most of the time, that’s not necessary either.

Would that work?

The extism plugin frame work https://extism.org/ recently added a Java sdk that can be used to call functions in wasn’t binaries from JVM-based applications:
https://extism.org/docs/integrate-into-your-codebase/java-host-sdk

This could be added to the list “running Webassembly in the JVM”

Cheers,
Thomas