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• ServiceCallContext -  immutable map of custom parameters to be implicitly passed to the service.
• ServiceCallInterceptor  - intercepts service method calls.
• ServiceInterceptorContext -  extended mutable version of caller context (interceptor obtains method call parameters from it and can use it to update the caller context).
• ServiceInterceptException - unchecked exception that is used to highlight the exception that occurred during method interception (not execution).

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ServiceCallInterceptor  - intercepts service method calls.

public interface ServiceCallInterceptor extends Serializable {
    public default void onInvoke(ServiceInterceptorContext ctx) throws ServiceInterceptException {
        // No-op.
    }

    public default void onComplete(@Nullable Object res, ServiceInterceptorContext ctx) throws ServiceInterceptException {
        // No-op.
    }

    public default void onError(Throwable err, ServiceInterceptorContext ctx) {
        // No-op.
    }
}

ServiceCallContext -  immutable map of custom parameters to be implicitly passed to the service.

public interface ServiceCallContext {
    public String attribute(String name);

    public byte[] binaryAttribute(String name);
}

ServiceInterceptorContext -  extended mutable version of caller context (interceptor obtains method call parameters from it and can use it to update the caller context).

public interface ServiceInterceptorContext extends ServiceCallContext {
    public String method();

    public @Nullable Object[] arguments();

    public void attribute(String name, String val);

    public void binaryAttribute(String name, byte[] val);
}

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