Rougamo.APM.Abstractions 4.0.0

Rougamo.APM

APM stands for Application Performance Management. Some common APM tools include Pinpoint, Zipkin, SkyWalking, CAT, and Jaeger. These popular APM tools typically come with built-in IO-level agents, which allow us to quickly integrate and record IO performance. However, sometimes IO integration alone might not be sufficient for thorough analysis and problem-solving. In such cases, we might need to manually add some instrumentation, which can be intrusive and cumbersome. To avoid this, we can use AOP for instrumentation, and Rougamo, as a static AOP component, can effectively handle this task.

This project does not include any specific APM implementations but provides basic implementations and proxy weaving methods for projects using Rougamo for APM code weaving. For specific APM implementations, refer to Rougamo.OpenTelemetry (0.1.1 released) and Rougamo.SkyWalking (in development).

Rougamo.APM.Abstractions

Common Attributes

Rougamo.APM.Abstractions defines several common attributes to avoid redundant definitions across different APM implementations and provides implementations for retrieving these attributes.

// Example of ApmExceptionAnnounceAttribute
// In the example below, since M3 has an unhandled exception, the Span on M3 will record the exception and mark its status as failed.
// M2, which calls M3 and does not catch the exception, will only mark its Span as failed without recording the exception because M3 has already recorded it.
// M1, which calls M2 and does not catch the exception, will also mark its Span as failed and will record the exception information due to the addition of ApmExceptionAnnounceAttribute.

[ApmExceptionAnnounce]
[Span]
void M1()
{
    M2();
}
[Span]
void M2()
{
    M3();
}
[Span]
void M3()
{
    throw new NotImplementedException();
}

Proxy Weaving

Rougamo.APM.Abstractions defines several attributes that are markers and do not directly use Rougamo for code weaving. To weave AOP based on these markers, we need to utilize Rougamo's proxy weaving functionality. For example, proxy weaving with Rougamo.OpenTelemetry can be done as follows; see the full example in the Rougamo.OpenTelemetry project:

[assembly: MoProxy(typeof(SpanAttribute), typeof(OtelAttribute))]
[assembly: MoProxy(typeof(PureSpanAttribute), typeof(PureOtelAttribute))]

// Implementation code weaving OtelAttribute
[Span]
void M1()
{
}
// Implementation code weaving PureOtelAttribute
[PureSpan]
void M2()
{
}

Rougamo.APM.JsonSerialization

When recording parameters and return values, they need to be serialized into strings. By default, ToStringSerializer is used, which directly calls the object's ToString method. You can implement your own ISerializer and replace the default ToStringSerializer as per the specific requirements of your APM implementation (usually by registering a singleton in IServiceCollection). The Rougamo.APM.JsonSerialization project provides a JSON serialization implementation using Newtonsoft.Json, and can be registered with services.AddRougamoJsonSerializer():

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // ...

        services.AddRougamoJsonSerializer(); // Use default serialization configuration

        services.AddRougamoJsonSerializer(settings =>
        {
            // Modify Newtonsoft.Json serialization configuration
        });

        // ...
    }
}